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ELECRAFT“ K3
HIGH-PERFORMANCE 160 – 6 METER
TRANSCEIVER
K3 KIT ASSEMBLY MANUAL
Rev D, December 26, 2007
Copyright © 2007, Elecraft, Inc.
All Rights Reserved
Contents
Battery BT1 Installation Procedure .............. 52
KBPF3 General Coverage Receive Option ...... 53
KBPF3 Description....................................... 53
KBPF3 Installation ....................................... 53
Power Amplifier Jumper Block ........................ 54
Finishing the Enclosure .................................... 54
Fan Opening Cover....................................... 54
Bottom Covers.............................................. 55
Top Cover ..................................................... 56
Introduction...................................................... 1
Customer Service and Support............................1
Technical Assistance .......................................1
Preventing Electrostatic Discharge Damage ... 3
How ESD Damage Occurs..................................3
Preventing ESD Damage.....................................3
Preparing for Assembly ................................... 4
Overview of the Kit.............................................4
Tools and Test Equipment Required ...................6
Unpacking and Inventory ....................................7
Screws .............................................................7
Standoffs .........................................................8
Lock Washers..................................................8
Test and Calibration....................................... 57
Initial Power Checks......................................... 57
Synthesizer Calibration..................................... 58
Filter Setup ....................................................... 58
Reference Oscillator Calibration ...................... 58
TX Gain Calibration ......................................... 58
Option Modules ................................................ 58
Enable Modules ................................................ 58
KPA3 100-Watt Amplifier Installation ............ 58
Other Calibration Procedures ........................... 59
Wattmeter Calibration (Optional)..................... 59
S-Meter Calibration (Optional)......................... 59
Assembly ......................................................... 9
RF Board and Chassis .......................................10
RF Board Description ...................................10
RF Board and Chassis Assembly Procedure .10
KANT3 or KAT3, Right Side and Rear Panels 18
KANT3 or KAT3 Description.......................18
KANT3 or KAT3, Right Side and Rear Panel
Installation Procedure....................................18
KIO3 Interface ..................................................23
KIO3 Description ..........................................23
KIO3 Interface Installation Procedure ..........23
Front Panel and DSP .........................................26
Front Panel and DSP Description..................26
Front Panel Assembly Procedure ..................26
Resistance Checks.........................................39
Initial Power On Check .................................40
KREF3 Reference Oscillator.............................40
KREF3 Description.......................................40
KREF3 Installation Procedure ......................40
KSYN3 Synthesizer ..........................................42
KSYN3 Description ......................................42
KSYN3 Installation Procedure......................42
Loudspeaker ......................................................44
Loudspeaker Description ..............................44
Loudspeaker Installation Procedure ..............44
KPA3 Shield......................................................47
KPA3 Shield Description ..............................47
KPA3 Shield Installation Procedure .............47
Bottom Cover ....................................................49
Bottom Cover Description ............................49
Bottom Cover Hardware Installation ............49
KNB3 Noise Blanker ........................................51
KNB3 Noise Blanker Description.................51
KNB3 Installation .........................................51
Battery BT1.......................................................52
Battery BT1 Description ...............................52
Appendix A, Illustrated Parts List................................ A1
i
Introduction
This manual will guide you through assembly of your Elecraft K3 transceiver. We’re confident that you’ll find
the K3 easy to build, even if you’ve had no prior kit-building experience.
Every modern transceiver is complex, and the K3 is no exception. The kit includes nearly 300 individual
components, including over a dozen PC boards and a multi-element modular chassis. But the K3's unique design
eliminates some of the tedious aspects of construction, enabling you to complete assembly in far less time than
previous high-performance transceiver kits. Also, virtually all of the alignment is handled in firmware using the
K3's built-in test capabilities.
If you should you have difficulty, you'll have our full support via phone and e-mail. In addition, we hope you'll
join our growing and enthusiastic community of owner/builders via the Elecraft reflector.
Further information about the Elecraft K3, including specifications, installation, and operation instructions, can
be found in the Owner’s Manual.
Customer Service and Support
Technical Assistance
You can send e-mail to [email protected] and we will respond quickly - typically the same day Monday
through Friday. Telephone assistance is available from 9 A.M. to 5 P.M. Pacific time (weekdays only) at 831662-8345. Please use e-mail rather than calling when possible since this gives us a written record of the details
of your problem and allows us to handle a larger number of requests each day.
Repair / Alignment Service (We want to make sure everyone succeeds!)
If necessary, you may return your Elecraft product to us for repair or alignment. (Note: We offer unlimited email
and phone support to get your kit running, so please try that route first as we can usually help you find the
problem quickly.)
IMPORTANT: You must contact Elecraft before mailing your product to obtain authorization for the
return, what address to ship it to and current information on repair fees and turn around times. (Frequently we
can determine the cause of your problem and save you the trouble of shipping it back to us.) Our repair location
is different from our factory location in Aptos. We will give you the address to ship your kit to at the time of
repair authorization. Packages shipped to Aptos without authorization will incur an additional shipping charge
for reshipment from Aptos to our repair depot.
1
Elecraft 1-Year Limited Warranty
This warranty is effective as of the date of first consumer purchase. It covers both our kits and
fully assembled products. For kits, before requesting warranty service, you should fully complete
the assembly, carefully following all instructions in the manual.
What is covered: During the first year after date of purchase (or if shipped from factory, date
product is shipped to customer), Elecraft will replace defective or missing parts free of charge
(post-paid). We will also correct any malfunction to kits or assembled units caused by defective
parts and materials. Purchaser pays inbound shipping to us for warranty repair, we pay shipping to
return the repaired equipment to you by UPS ground service or equivalent to the continental USA
and Canada. Alaska, Hawaii and outside U.S. and Canada actual return shipping cost paid by
owner.
What is not covered: This warranty does not cover correction of kit assembly errors. It also does
not cover misalignment; repair of damage caused by misuse, negligence, or builder modifications;
or any performance malfunctions involving non-Elecraft accessory equipment. The use of acidcore solder, water-soluble flux solder, or any corrosive or conductive flux or solvent will void this
warranty in its entirety. Also not covered is reimbursement for loss of use, inconvenience,
customer assembly or alignment time, or cost of unauthorized service.
Limitation of incidental or consequential damages: This warranty does not extend to nonElecraft equipment or components used in conjunction with our products. Any such repair or
replacement is the responsibility of the customer. Elecraft will not be liable for any special,
indirect, incidental or consequential damages, including but not limited to any loss of business or
profits.
2
Preventing Electrostatic Discharge Damage
There is no climate or work location where the components of your K3 are safe from Electrostatic Discharge
(ESD) unless you take specific steps to prevent such damage. Many of the components in your K3 can be
damaged by static discharges of only a few volts: far too little for you to notice. It is those low-voltage but
destructive discharges that easily happen anywhere and under virtually any environmental conditions.
ESD damage may not be apparent at first. The damaged components may not fail completely. Instead, the
damage may result in below-normal performance for an extended period of time before you experience a total
failure.
How ESD Damage Occurs
Whenever an object containing a static charge touches a circuit in your K3, current will rush into the circuit until
the components reach the same voltage as the source of the static charge. If the voltage or current that passes
through a component in your K3 during that brief period exceeds its normal operating specifications, it may be
damaged or destroyed.
Preventing ESD Damage
ESD damage cannot occur if there is no voltage difference between the components in your K3 and any object
that touches them. That is how anti-static packaging works. Anti-static bags allow the static charge to flow over
their surface, so that any part of the bag that touches the components inside are all at the same potential at all
times. Anti-static foam keeps the leads of sensitive components at the same potential.
At your work bench, avoiding a dangerous voltage is achieved most easily by tying everything together and
connecting them to a common mains safety ground. This includes your K3, individual boards or other sensitive
components as well as everything they may touch at the work table.
Inexpensive static dissipating work mats are readily-available that will steadily and safely drain off any charges
built up on parts or circuit boards placed on them. They are supplied with a lead that connects the mat to the
common workbench ground. Also, metal cabinets on test equipment used on the bench should be tied together
and connected to the common ground.
Most importantly, you must have a way of continuously draining off any static charges that occur on your body.
Such charges are easy to create, even while sitting quietly at the work bench. Moving your feet on the floor,
shifting position in your chair or even moving your arms so that clothing rubs against itself can all produce
destructive static charges. You can discharge yourself by touching an unpainted metal ground, but that will last
only until you move in a way that produces a new static charge. The safest technique is to wear a grounded wrist
strap with a series 1-megohm resistor that continuously drains off any charges. Such wrist straps are readilyavailable and inexpensive.
WARNING
DO NOT attach a ground directly to yourself without a current-limiting resistor as this poses
a serious shock hazard. A wrist strap must include a 1-megohm resistor to limit the current
flow. If you choose to touch an unpainted, metal ground to discharge yourself, do it only
when you are not touching any live circuits with your other hand or any part of your body.
We strongly recommend you take the following anti-static precautions (listed in order of importance) to avoid
trouble:
x
Leave ESD-sensitive parts in their anti-static packaging until you install them. The packaging may be a
special plastic bag or the component’s leads may be inserted in conductive foam. Parts which are
3
especially ESD-sensitive are identified in the parts list and in the assembly procedures.
x
Wear a conductive wrist strap with a series 1-megohm resistor. If you do not have a wrist strap, touch a
ground briefly before touching any sensitive parts to discharge your body. Do this frequently while you
are working. You can collect a destructive static charge on your body just sitting at the work bench. DO
NOT attach a ground directly to yourself as this poses a serious shock hazard.
x
Use a grounded anti-static mat on your work bench.
x
If you choose to use a soldering iron to work on your K3 for any reason, be sure the iron is ESD-safe
with a grounded tip tied to the same common ground used by your mat or wrist strap.
Preparing for Assembly
Overview of the Kit
The kit comprises two major assemblies: the main chassis and the front panel. Figure 1 shows an assembled
K3/10 with its top cover removed.
The main chassis is literally built up around the RF circuit board, which fills the entire bottom of the unit of the
chassis assembly. Panels are mounted around the RF board using Elecraft’s 2D fasteners. These fasteners allow
individual removal of any one panel, if needed, to gain access to the inside of the radio for servicing. Very few
cables or wires are used in the kit. Most of the other boards and optional accessories plug directly into the RF
board or one of the boards mounted on the RF board.
The front panel assembly, including the display and main operator controls, includes the front panel board and
the digital signal processing (DSP) board.
There are many options that you can add to the basic K3/10, such as the 100 watt amplifier module, internal
antenna tuner, second receiver, additional crystal I.F. filters, etc. If you purchased these options with your K3
kit, you will find instructions to install them at proper places in the assembly procedure to make getting your
complete K3 together and operational in the most efficient manner.
4
KIO3
BOARD
KIO3
REMOTE
I/O MODULE
KIO3 AUDIO
I/O MODULE
AND OPTIONAL
KXV3 MODULE
(HIDDEN)
PA JUMPER
BLOCK
K3 CHASSIS
ASSEMBLY
K3 LPA
BOARD
KANT3
OR OPTIONAL
KAT3 BOARD
(KAT3 SHOWN)
K3 RF
BOARD
(FILLS
BOTTOM OF
CHASSIS
ASSEMBLY)
KNB3
BOARD
CRYSTAL
FILTERS
(OPTIONAL
8-POLE
FILTERS
SHOWN)
K3 MIXER
BOARD
FRONT
PANEL
SHIELD
K3 DSP BOARD
KSYN3
BOARD
KREF3
BOARD
K3 FRONT PANEL
BOARD (HIDDEN)
Figure 1. Assembled K3/10 (Less Top Cover).
5
FRONT PANEL
ASSEMBLY
(INCLUDING
K3 DSP AND
K3 FRONT PANEL
BOARDS)
Tools and Test Equipment Required
1.
#0 and #1 size Phillips screwdrivers. To avoid damaging screws and nuts, do not use a power
screwdriver. Use the screwdriver that best fits the screw in each step.
2. Soft cloth or other surface to lay cabinet panels on to avoid scratching. A clean static-dissipating mat is
ideal (see below). If using cloth, do not lay circuit boards on it.. See Preventing Electrostatic
Discharge Damage on page 3.
3. Pliers or suitable wrenches for tightening 1/4”, 3/16” and 1/2” nuts. The 1/2” size is used to tighten nuts
on the front panel controls. If available, a deep socket or nut driver is recommended. Pliers or an
ordinary wrench can be used, but requires care to avoid damaging the front panel paint.
4. Long nose pliers.
5. Diagonal cutters.
6. Small rule capable of measuring lengths up to 1” (2.5 cm) with an accuracy of at least 1/16” inch
(1.6 mm).
7. Digital Multimeter (DMM) for resistance checks.
8. RF 50-ohm, 5 W (minimum) dummy load with low VSWR from 160 meters through 6 meters.
9. Power supply 13 VDC nominal (11-16 V) with a cable and Anderson PowerPole® connector. A power
cable kit is provided with your K3 if you do not have a suitable cable with the required Anderson
PowerPole connector. The power supply must be capable of providing at least 3 Amperes for a K3/10
and 20 Amperes for a K3/100. (See Specifications in your Owner’s manual for more information on
power supply recommendations).
The following tools are strongly recommended:
1. ESD wrist strap.
2. Static dissipating work mat.
Optional Equipment:
1. RF Power Meter with accurate readout from 1 mW to 5 watts, minimum.
2. Signal generator with calibrated 50 uV output at 20 or 40 meters.
In addition, two Allen wrenches, 5/64” (2mm) and .050”, are supplied with your kit.
6
Unpacking and Inventory
CAUTION
Do not handle the circuit boards without anti-static protection! Doing so may damage
sensitive components. See Preventing Electrostatic Discharge Damage on page 3 for important
information before proceeding.
Before starting construction, do a complete inventory, comparing the parts in your kit with the parts list in
Appendix A, to familiarize yourself with all of the parts and to ensure the kit is complete. Note that you may
find some extra screws, nuts and washers. A few extras of the more easily lost parts are included on purpose.
All dimensions given in the assembly procedure are provided in both US customary (often called English) and
metric measurements. The native dimensions of the parts are in US Customary units. Approximate metric
equivalents are given to assist those more familiar with that system to identify the correct parts.
Screws
A number of different types and sizes of screws and washers are used in the assembly. It is very important that
you use the screw specified in each location or your finished K3 may not fit together properly. In some places,
using the wrong size screw may damage components. The following various screw types and sizes specified in
the text are shown in Figure 2. Images are shown for comparing relative sizes. They are not to scale. The length
of the screws called for in the text are measured as shown.
SCREW AS IDENTIFIED IN TEXT
RELATIVE SIZE
(NOT TO SCALE)
MEASURING SCREW
LENGTHS
2-56 5/32" (4.0 mm) BLACK PAN HEAD
FROM BOTTOM OF
PAN HEAD TO END OF
THREADED SHAFT
2-56 1/4" (6.4 mm) BLACK PAN HEAD
4-40 3/16" (4.8 mm) BLACK PAN HEAD
4-40 3/16" (4.8 mm)BLACK FLAT HEAD
4-40 1/4" (6.4 mm) BLACK PAN HEAD
FROM TOP OF FLAT
HEAD TO END OF
THREADED SHAFT
4-40 3/8" (9.5 mm) BLACK PAN HEAD
4-40 1/4" (6.4 mm) ZINC PAN HEAD
4-40 3/8" (9.5 mm) BLACK FLAT HEAD
4-40 7/16" (11 mm) ZINC PAN HEAD
4-40 1/2" (13 mm) BLACK FLAT HEAD
6-32 1/2" (13 mm) BLACK PAN HEAD
Figure 2. Screw Sizes Used in Assembly.
7
Standoffs
A number of threaded standoffs are used. As with the screws and washers, be sure you use the correct size as
specified in the text. Standoff lengths are measured from end to end as shown in Figure 3. Standoffs threaded for
2-56 and 4-40 screws are used.
LENGTH AS SPECIFIED IN TEXT
THREAD SIZE AS
SPECIFIED IN TEXT,
EITHER 4-40 OR 2-56
Figure 3. Typical Standoff.
Lock Washers
Two types of lock washers are used in the K3 (see Figure 4). It is important that you use only the type specified
and put the washers exactly where indicated. Failing to use the correct type may result in short circuits to nearby
circuit traces. Adding washers or placing the washers in the wrong position may cause parts to fail to fit together
properly.
INSIDE TOOTH
SPLIT
Figure 4. Lock Washers.
8
Assembly
IMPORTANT ASSEMBLY INFORMATION
1. A variety of screws and fasteners are used to assemble your K3:
x
Use your rule to check the length of screws and standoffs before installing them. Some
components are only 1/16” different from others but using the wrong size may result in parts not
fitting correctly, possibly damage electrical and mechanical components. See Screws on page 7
and Standoffs on page 8 for more measurement instructions.
x
Loosen screws as needed for a proper fit. When mounting parts with multiple screws or
adjacent parts that fit together, such as the exterior cabinet panels, loosen adjacent mounting
screws as needed to adjust the parts for the best fit. Be certain you re-tighten the screws before
proceeding!
x
Ensure all screws are tight. A loose screw can cause both mechanical and electrical problems
such as intermittent operation, unexpected noise or false signals (birdies) in the receiver.
x
Threads can be easily stripped if too much force is applied when tightening screws. Use the
correct size hand tool and apply only moderate torque. Do not use a power screwdriver!
2. Brief circuit descriptions are provided through the manual for those interested in the functions of the
circuits. For more detailed circuit information, consult the Theory of Operation in your Owner’s
manual.
CAUTION – TO AVOID DEGRADING THE PERFORMANCE OF YOUR K3:
DO NOT DISTURB ANY ADJUSTMENTS ON THE BOARDS!
Each board was tested and aligned for optimum performance at the factory. Any change to
these adjustments will degrade the performance of your K3 or prevent its operation
altogether. All user calibrations and adjustments are done in firmware using the front panel
menus. These are described at the appropriate points in the assembly procedures.
DO NOT ADJUST THE TURNS ON ANY TOROIDS!
The position of the turns on the cores of many toroids has been adjusted at the factory to
produce exactly the inductance needed for the circuit to work properly. Any attempt to
adjust their position or to make a coil look “nicer” may seriously degrade circuit
performance.
Also, do not attempt to fix the turns or coils in place with adhesives or other materials.
Adding material to the coils on the factory-aligned and tested boards will alter their
inductance, again degrading circuit performance.
ESD SENSITIVE!
Observe ESD precautions when handling the circuit boards and whenever you are working
on your K3 with the covers off. Failure to observe ESD precautions may result in your K3
not operating at all, or operating but not meeting normal factory performance
specifications due to damaged components. See page 3 for more information.
9
RF Board and Chassis
RF Board Description
The RF PCB (Printed Circuit Board) is the heart of the K3 transceiver, both physically and electrically. During
assembly, it serves as an attachment point for other PCBs as well as chassis panels, acting as the glue that holds
things together. During operation, the RF board provides signal routing to and from all modules. For more
information, see Theory of Operation, RF Board, in the K3 Owner’s Manual.
RF Board and Chassis Assembly Procedure
Remove the RF board from its anti-static packaging. The top side of the board is the side with the toroid
inductors and relays along with other components, including several connectors along one edge. The edge with
the connectors is the back edge of the board, while the front edge has notches cut in it that will fit around front
panel controls. Locate the six rectangular bare copper pads for the 2D fasteners (see Figure 5). There is one in
each corner of the board and one in the center of each side (see Figure 11 on page 14).
TYPICAL 2D FASTENER
LOCATION
ESD SENSITIVE!
WEAR A GROUNDED
WRIST STRAP OR TOUCH
AN UNPAINTED METAL GROUND
BEFORE HANDLING THE RF BOARD.
Figure 5. 2D Fastener Location on RF Board.
Install 2D fasteners at the six spaces provided (one at each corner and at the center of each side of the RF
board). Mount the fasteners on the bottom side of the board as shown in Figure 6. Be sure the 2D fasteners are
oriented so the side of each fastener lines up with the edge of the RF board as shown.
4-40 3/16" (4.8 mm) BLACK
PAN HEAD SCREWS
4-40 SPLIT LOCK WASHERS
2D ON THE
BOTTOM OF
BOARD
SIDE FLUSH
WITH EDGE
WIDE SHOULDER ON 2D
TOWARD EDGE
Figure 6. Installing 2D Fasteners on RF Board.
10
Install a 4-40 3/8” (9.5 mm) standoff on the RF board near connector Z1 as shown in Figure 7 below and
Figure 11 on page 14. This standoff will support the mixer to be installed later. Install the standoff using three
lock washers as shown below with two of the lock washers between the standoff and the RF board.
4-40 3/8" (9.5 mm)
STANDOFF
TOP OF RF BOARD
CONNECTOR
Z1
TWO 4-40 SPLIT
LOCK WASHERS
4-40 SPLIT
LOCK WASHER
4-40 1/4" (6.4mm)
ZINC PAN HEAD
SCREW
ESD SENSITIVE!
Figure 7. K3 Mixer Standoff Location.
Install the two KBPF3 standoffs shown in Figure 8. Even if you didn’t purchase the KBPF3 general
coverage option, the standoffs and hardware are included in the K3 kit to make installing the option easier at
some future date. Note that these standoffs have only one lock washer between each standoff and the RF board.
ESD SENSITIVE!
LEFT SIDE OF RF BOARD
TOP OF RF BOARD
4-40 1/2" (13 mm) STANDOFF
4-40 SPLIT LOCK WASHER
4-40 SPLIT LOCK WASHER
4-40 1/4" (6.4mm) ZINC PAN HEAD SCREW
Figure 8. Installing KBPF3 Standoffs.
11
Install hardware to attach Q3 to the RF board near the rear left corner as shown in Figure 9 and Figure 11
on page 14.
#4 INSIDE TOOTH
LOCK WASHER
4-40 NUT
Q3
CIRCUIT
BOARD
4-40 7/16" (11 mm)
ZINC PAN HEAD SCREW
RF BOARD LEFT REAR CORNER
Figure 9. Installing Q3 Hardware on RF Board.
Locate the crystal I.F. filters. Two types of filters are available: standard 5-pole filters and optional 8-pole
filters (see Figure 10). One standard 5-pole 2.7 kHz filter is supplied. If you have elected to equip your K3 with
the optional 8-pole 2.8 kHz filter, it has been supplied instead of the 2.7 kHz filter. If you have purchased
additional filters, they may be installed now as well. If you plan to add filters later, spaces may be left for them.
For example, if you plan to add the FM or a 6 kHz AM filter later, you can leave spaces FL1 and FL2 open for
them and install the 2.8 kHz filter in position FL3. The filters are not hard to move about later, so if you aren’t
sure, install the widest at FL1, the next widest at FL2 and so on.
See Appendix A in your Owner’s Manual for more information about making a filter
plan and installing multiple filters and for installing filters for use with the sub-receiver.
Enter the following data on Table 1.You will need this information to set up your filters after assembling
your K3. Be sure you’re following the rule described in the step above about the proper order for the filters.
Enter the bandwidth in the row opposite the filter position where it will be installed.
Enter the FREQ OFFSET shown on each filter. The optional 8-pole filters have no offset
marked on them. Enter a zero in the FREQ OFFSET column for those filters. Note that the
frequency offset may be negative, indicated by a minus sign (single dash)ahead of the
number! Turn the VFO A knob to the left (anti-clockwise) to enter negative values.
Table 1. Filters Installed.
POSITION
BANDWIDTH
FL1
FL2
FL3
FL4
FL5
12
FREQ OFFSET
Install the filters as shown in Figure 10. Refer to the list of filters you created in Table 1 to determine which
filter to install at each location.
CAUTION
1) Do not use screws longer than 1/4” (6.4 mm) to mount the filters. Use your ruler to
measure the screws before installing them. Longer screws may extend into the optional 8pole filter and destroy it. We strongly recommend you use a 1/4” screw even when installing
the 5-pole filters to reduce the possibility of damaging an 8-pole filter should you change
them later.
2) Do not over-tighten the screws. Too much torque may pull the threaded bushing out of
the bottom of the filter module.
STANDARD 5-POLE FILTERS
4-40 1/4" (6.4 mm)
ZINC PAN HEAD
SCREW
OPTIONAL 8-POLE FILTERS
#4 INSIDE
TOOTH
WASHER
RF BOARD, TOP SIDE.
FILTERS MUST BE INSTALLED IN
CORRECT POSITIONS. SEE TEXT
FOR DETAILS.
Figure 10. Installing Crystal I.F. Filters on RF Board.
13
ESD SENSITIVE!
WEAR A GROUNDED
WRIST STRAP OR TOUCH
AN UNPAINTED METAL GROUND
BEFORE HANDLING THE RF BOARD.
2D
FASTENER
2D
FASTENER
PA JUMPER BLOCK
(PREINSTALLED)
Q3
KBPF3
STANDOFFS
2D
FASTENER
2D
FASTENER
2D
FASTENER
CRYSTAL
I.F. FILTER
MIXER
STANDOFF
2D
FASTENER
Figure 11. RF Board Partially Assembled.
14
Install the Low Power Amplifier (LPA) board in the cutout on the RF board as shown in Figure 12. The
LPA board is held in place by its connectors until the bottom cover is installed..
TOP VIEW
1
ESD SENSITIVE!
POSITION THE
LPA BOARD SO
THE THREE
CONNECTORS
MATE PROPERLY.
2
SUPPORT EACH
CONNECTOR FROM
BENEATH WHILE PRESSING
THEM TOGETHER. WORK
AROUND THE CONNECTORS
PRESSING THEM TOGETHER
IN INCREMENTS UNTIL
ALL THREE ARE
FULLY MATED.
BOTTOM VIEW
LPA CONNECTOR
DO NOT DISTURB THE
POSITION OF THE THREE
POWER TRANSISTORS.
THEY WILL BE SECURED
TO THE STANDOFFS LATER.
Figure 12. Installing the Low Power Amplifier (LPA).
15
Mount the front panel shield on the RF board as shown in Figure 13, then mount a 2D fastener on each ear
at the top of the shield as shown. Be sure the 2D fasteners are oriented with the widest part between the two
holes and the edge toward the outside as shown.
2D FASTENERS WITH WIDEST SHOULDER
TOWARD THE OUTSIDE AS SHOWN
4-40 SPLIT LOCK WASHERS
4-40 3/16" (4.8mm) BLACK PAN HEAD SCREWS
4-40 1/4" (6.4mm) PAN HEAD ZINC SCREW
4-40 SPLIT LOCK
WASHER
RF PC BOARD
4-40 1/4" (6.4mm) ROUND
STANDOFF
NOTE! NO WASHER BETWEEN
PC BOARD AND STANDOFF
Figure 13. Installing Front Panel Shield.
Mount the K3 mixer board on the RF board as shown in Figure 14. The mixer plugs into Z1 on the RF
board.
MIXER
4-40 1/4" (6.4 mm) ZINC
PAN HEAD SCREW
#4 SPLIT LOCK
WASHER
CIRCUIT
BOARD
ESD SENSITIVE!
STANDOFF
ON RF BOARD
FRONT PANEL
SHIELD
Figure 14. Installing K3 Mixer Board.
16
Locate the two side panels. They are approximately 4” (10 cm) by 9-7/8” (25 cm) in size. Both panels have
six counter-sunk screw holes near the edges. Note that the countersunk holes are farther from one end than the
other. This is important. You will need to orient the panels correctly as you install them. The side panels are
different as well. In addition to the six counter-sunk screw holes, the left side panel has two holes near the
centerline for attaching the handle. The left side panel with the handle attached is shown in Figure 16. The right
side panel has six additional holes, four for mounting the side feet and two for attaching other parts inside the
K3 (see Figure 19). Set the right side panel aside for now.
Check the inside (partially painted) of both panels to ensure no masking tape is covering any screw holes. If
found, peel it off.
Attach the handle to the left side cover using the hardware shown in Figure 15 at each end. The ribbed side
of the handle faces away from the panel. Tighten the screws enough to compress the lock washers, but do not
tighten the screws so much that you deform the handle end cover. The handle should move easily to allow room
for your fingers between the handle and cover for carrying, then lie flat against the cover when it is not in use.
6-32 1/2" (1.3cm) BLACK PAN HEAD SCREW
HANDLE END COVER
FLEXIBLE HANDLE WITH SPRING STEEL
INSERT
K3 SIDE COVER
#6 SPLIT LOCK WASHER
6-32 NUT
Figure 15. Installing Side Handle Mounting Hardware.
Attach the left side panel to the RF board assembly as shown in Figure 16 using five 4-40 3/16” (17mm)
black flat head screws. Do not use washers. When the panel is oriented correctly, the edge of the panel will
extend about 1/2” (13 mm) past the 2D fasteners at the front panel shield. If the threaded holes in the 2D
fasteners don’t line up properly with the holes in the side panels, temporarily loosen the screws attaching the 2D
fastener to the RF board or front panel shield, then tighten them again after the side panel is installed.
THIS END OF THE PANEL EXTENDS ABOUT 1/2" (1.3 cm)
PAST THE 2D FASTENERS
USE 4-40, 3/16" (4.8 mm) BLACK FLAT HEAD SCREWS TO
ATTACH THE SIDE PANEL WHERE INDICATED BY THE ARROWS.
Figure 16. Mounting Left Side Panel.
17
Inspect the area where the side panel meets the front panel shield, and make sure there is positive
mechanical contact at the screw just below the end of the handle and about 3/4” (19 mm) above the RF board.
The area of the side panel around that point is clean metal. Tighten the screws as needed to ensure good contact
at that point and at each 2D fastener.
CAUTION
Failure to establish a solid contact at that point may result in birdies in the receiver.
Throughout the assembly, be sure all chassis screws are tight!
Mount a 2D fastener at the top back corner of the left side panel (the one you just installed) with a 4-40
3/16” (4.8 mm) black flat head screw as shown in Figure 17. Do not use washers. Be sure the 2D fastener is
oriented correctly as shown in the figure.
4-40 3/16" (4.8 mm)
BLACK FLAT
HEAD SCREW
WIDEST SIDE OF
2D FASTENER
CLOSEST TO
SIDE PANEL
Figure 17. Installing Left Side Panel 2D Fastener.
KANT3 or KAT3, Right Side and Rear Panels
If you purchased a KAT3 with your kit, you did not get a KANT3 board with your kit.
For more information, see the KANT3 AND KAT3 Circuit Description below.
KANT3 or KAT3 Description
The basic K3/10 includes a KANT3 antenna input module. If you’ve ordered a KAT3 antenna tuner, the
KANT3 is not required and will not be supplied with the kit. In either case, the module plugs into the RF board
at the back-right corner. Both the KANT3 and KAT3 provide antenna surge protection, as well as resistors for
bleeding off static DC charge. The KAT3 provides a wide-range, switchable C-in/C-out L-network. See Theory
of Operation, KANT3 and KAT3, in the K3 Owner’s Manual for more details.
KANT3 or KAT3, Right Side and Rear Panel Installation Procedure
Locate the rear panel and check the inside for any masking tape still covering screw holes. If found, peel it
off.
Mount the SO239 connector in the ANT1 position on the rear panel using two 4-40 1/4” (6.4 mm) black
pan head screws, two 4-40 inside tooth lock washers and two 4-40 nuts as shown in Figure 18. The flange of the
SO239 connector is on the inside (unpainted) side of the rear panel.
4-40 1/4" (6.4mm)
BLACK PAN HEAD
SCREWS
4-40 INSIDE TOOTH
LOCK WASHERS
AND NUTS
Figure 18. Mounting the ANT1 Connector.
18
If you are installing the KAT3, install the second SO239 connector in the ANT2 position on the rear panel
using two 4-40 1/4” (6.4 mm) black pan head screws, two 4-40 inside tooth lock washers and two 4-40 nuts just
as you did for the ANT1 connector. Set the rear panel aside for now.
Install the four rubber side feet in the holes in the right side panel as shown in Figure 19. Two suggested
procedures for doing this are as follows:
Twist Method:
Press Method:
Wet the tip of the foot with a tiny amount of
soap. (Do not use petroleum jelly or oils. They
can deteriorate the rubber over time).
Press the foot against the outside (fully
painted side) of the panel so the tip is in
the hole at an angle.
Place the foot, tip up, on a solid work surface.
While pressing the tip into the hole, twist
the foot so the edge of the tip grabs the
inside edge of the hole.
Position the panel with the outside (fully painted
side) toward the foot with the hole in the panel
against the tip and press down. The tip should
slip through the hole without further help. If
necessary, grip the tip and pull with your longnose pliers, working it from side to side until the
shoulder opens against the inside of the panel.
Do not use excessive force. You can tear the
foot apart.
Continue pressing and twisting until the
tip is fully inside the panel all the way
around its circumference. Do not twist
with excessive force. You can tear the
foot apart.
Wipe any excess soap off of the panel or foot.
PULL TIP THROUGH HOLE
UNTIL SHOULDER IS INSIDE
THE PANEL ALL THE WAY
AROUND
SIDE PANEL
FOOT
INSTALL FEET IN THESE HOLES
Figure 19. Installing Side Panel Feet.
Position the right side panel against the K3 to verify how it will fit against the RF board. When it is oriented
correctly, the three holes along the bottom edge will line up with the holes in the 2D fasteners on the RF board
and two holes in the side panel will be aligned with the tabs on voltage regulators U12 and U13. The end of the
panel toward the rear will very nearly line up flush with the edge of the RF board. Do not mount the side panel
yet, but note which corner of the panel is in the upper rear corner. You’ll work with this corner in the next step.
19
At the upper rear corner of the side panel you just identified in the previous step, mount a 2D fastener as
shown in Figure 20, using a black 4-40 1/2” (13 mm) flat head screw. Remember that flat head screws are
measured from the flat top to the end of the threads. Note that the screw extends some distance through the 2D
fastener.
WIDEST SHOULDER OF
THE 2D CONNECTOR
NEAREST THE SIDE PANEL
1/2" (13 mm) BLACK
FLAT HEAD SCREW
Figure 20. Mounting 2D fastener for KANT3 Standoff.
Screw a 4-40 1/2” (13 mm) standoff onto the exposed end of the screw as shown in Figure 21. Do not use a
lock washer between the standoff and the 2D fastener. Tighten the standoff securely against the 2D fastener.
Set the side panel aside temporarily.
NO WASHER
BETWEEN
STANDOFF AND
2D FASTENER
1/2" (13 mm) 4-40 HEX
STANDOFF
Figure 21. KANT3 Mounting Standoff.
Insert J70 on the KANT3 or the KAT3 board into P70 near the red and black APP power connectors at the
right rear corner of the RF board. The KANT3 board is shown in Figure 22. The KAT3 board fits exactly the
same way with the toroidal inductors toward the center of the RF board.
KANT3 BOARD
SHOWN.
OPTIONAL KAT3
GOES HERE
REPLACING
THE KANT3.
BE SURE J70
IS FULLY MATED
TO P70 ON THE
RF BOARD
Figure 22. Installing the KANT3 or KAT3 Board.
20
Peel the backing from the self-adhesive serial number label and attach it to the back panel as shown in
Figure 23. You may wait until the assembly is finished before attaching the serial number, but at this point you
can lay the panel flat on the work surface to easily position the label square within the outline.
ATTACH SELF-ADHESIVE
SERIAL NUMBER HERE
Figure 23. Attaching Serial Number.
Position the rear panel on the K3 chassis assembly so that the SO239 connector(s) are at the end nearest the
KANT3 or KAT3 board. The hole above the GROUND legend on the rear panel should line up with the
threaded ground stud on the RF board.
Thread the 6-32 thumbscrew into the ground terminal position near the center of the rear panel as shown in
Figure 24. Use two #6 flat washers between the thumbscrew and the back panel as shown.
6-32 THUMBSCREW
TWO #6 FLAT WASHERS
Figure 24. Installing Rear Panel Ground Screw.
Attach the bottom lip of the rear panel to the 2D fasteners at the rear corners of the RF board with 4-40,
3/16” (4.8 mm) black pan head screws. (Note that all the screws used on the bottom of the K3 are black pan
head screws.)
Connect the wires from the SO239 connector(s) to the KANT3 or KAT3 board as shown in Figure 25. Use
needle-nose pliers to grip the terminals on the wire ends and carefully insert the connectors straight into the
holes in the board. They may be very difficult to insert unless they are perfectly aligned. While inserting the
plugs, support the board with your fingers to avoid putting stress on the connector at the bottom.
SUPPORT THE TOP OF THE
BOARD WHILE INSERTING
THE PLUGS.
TO
ANT 1 JACK
TO
ANT2 JACK
ANTENNA
CONNECTION
TO KANT3
BOARD
KANT3
KAT3
Figure 25. ANT Connections to KANT3 or KAT3 Boards.
21
Attach the right side panel to the RF board assembly four 4-40 3/16” (4.8mm) black flat head screws: three
along the bottom and one at the top front into the 2D fastener on the front panel shield. Do not use washers.
Note that there are two open holes for screws to secure voltage regulators U12 and U13. They will be installed
later.
Mount the KANT3 or KAT3 board to the standoff on the side panel with a 4-40 1/4” (6.4mm) zinc pan
head screw and a #4 split lock washer under the screw head as shown in Figure 26. Do not place a washer
between the board and the standoff.
4-40 1/4" (6.4 mm) ZINC
PAN HEAD SCREW AND
#4 SPLIT LOCK WASHER
4-40 3/16” (4.8 mm)
BLACK FLAT HEAD
SCREW
Figure 26. Installing KANT3/KAT3 Mounting Screw.
Install a 4-40 3/16” (4.8 mm) black flat head screw to secure the top of the rear panel to the 2D fastener as
shown in Figure 26
Install another 4-40 3/16” (4.8 mm) black flat head screw at the opposite end of the rear panel to secure it to
the top 2D fastener on the left side panel. When properly positioned, the rear panel should fit snugly against the
inside edge of the side panel as shown in Figure 26. Verify the fit is correct at both ends. If necessary loosen the
2D fastener screws enough to adjust the position of the panels. .
If you installed the KANT3 board, the hole for the ANT2 jack is not used. Insert the larger of the hole plugs
in the opening until it clicks in place (see Figure 27).
22
Insert the smaller hole plugs in the AUX RF connector hole at the bottom left and the REF connector at the
bottom right. Align the open side of the plug with the flat side of the hole as shown in Figure 27. If the plug does
not have a cutout, use your diagonal cutters to clip out a section of the plug so it will fit into the hole.
LARGE PLUG IN
PLACE (NOT USED
IF KAT3 OPTION
IS INSTALLED)
ALIGN CUTOUT ON SMALL
PLUG WITH FLAT SIDE
IN HOLE
IF NEEDED TRIM OUT
SECTION OF PLUG
TO FIT HOLE
Figure 27. Installing Rear Panel Hole Plugs.
KIO3 Interface
KIO3 Description
All rear-panel audio and digital/computer I/O is routed through the KIO3. The KIO3 is made up of three PC
boards: Main, Audio I/O and Digital I/O. The Main KIO3 board plugs directly into the RF board, while the
Audio and Digital I/O modules plug into the KIO3 main board. All three boards can be upgraded to meet future
requirements. See Theory of Operation, KIO3, in the K3 Owner’s Manual for more information.
KIO3 Interface Installation Procedure
If you have purchased the KXV3 option with your kit, go to the Installation Procedure in the KXV3
manual and install the option now, following the instructions in the Special Note to K3 Kit Builders. Otherwise
mount the small blank panel in the space directly above PADDLE, KEY, PTT and KEY OUT connectors on the
rear panel as shown in Figure 28.
DO NOT INSTALL IF YOU
ARE INSTALLING THE KXV3
INTERFACE OPTION.
SEE TEXT FOR DETAILS.
1/4" (6.4 mm) BLACK PAN
HEAD SCREWS WITH 4-40
SPLIT LOCK WASHERS AND
4-40 NUTS INSIDE.
BLANK PANEL
Figure 28. Preparing Rear Panel for KIO3 Installation.
23
Mount two 1-1/4” (31.8 mm) standoffs in the two holes on the KIO3 board as shown in Figure 29. One is in
the corner and the other is about half way down the opposite side of the board. Do not put lock washers between
the standoffs and the board.
Plug the Audio I/O daughter board into J91 as shown in Figure 29. The second daughter board will be
installed later.
#4 INSIDE
TOOTH
LOCK
WASHER
4-40 1/4" (6.4 mm)
PAN HEAD SCREW
ESD SENSITIVE!
DO NOT PUT LOCK
WASHER BETWEEN
BOARD AND STANDOFF!
BE SURE CONNECTORS
ARE FULLY MATED
Figure 29. Preparing the KIO3 Board for Installation.
Install the KIO3 Main board with the Audio I/O daughter board attached into the K3 as shown in Figure 30.
The KIO3A main board plugs into J76 on the RF board. If the KXV3 is installed, the coaxial TMP cable fits
between the KXV3 and KIO3 boards. Ensure the connectors are fully mated so the standoffs line up with the
screw holes on the rear panel.
TILT BOARD JUST
ENOUGH FOR THE
STANDOFF TO CLEAR
THE LIP ON THE REAR
PANEL
ESD SENSITIVE!
BE SURE CONNECTORS
ARE ALIGNED WITH
ALL PINS ENGAGED
WHEN BOARD IS
FULLY SEATED
KXV3 BOARD
ASSEMBLY
(IF INSTALLED)
Figure 30. Installing KIO3 Main Board.
24
The DB9 multi-pin connector on the KIO3 Digital I/O daughter board may have jackscrew nuts installed
on the connector. (Jackscrew nuts are shown in Figure 32). If so, remove them. They will be reinstalled shortly.
Install the KIO3 Digital I/O daughter board as shown in Figure 31. Be careful to support the KIO3 main
board as shown while pressing the daughter board in place.
SUPPORT THE KIO3
MAIN BOARD WHILE
PRESSING THE
DIGITAL I/O BOARD
IN PLACE.
ESD SENSITIVE!
BE SURE THE PINS ARE
PROPERLY ALIGNED AND
THE CONNECTORS ARE
FULLY MATED
Figure 31. Installing the KIO3 Digital I/O Board.
Install the KIO3 rear panel as shown in Figure 32.
4-40 1/4" (6.4 mm) BLACK
PAN HEAD SCREW
(NO WASHER) IN
EACH CORNER
BE SURE AUDIO JACKS
ARE ALIGNED WITH
PANEL CUTOUTS
USE A 4-40 SPLIT
LOCK WASHER UNDER
EACH JACK SCREW NUT
(4 PLACES)
KXV3 INTERFACE OPTION
(IF INSTALLED)
Figure 32. Mounting KIO3 Connector Panel.
25
Front Panel and DSP
Front Panel and DSP Description
The Front Panel is a large plug-in module that provides the K3’s user interface (LCD, switches, shaft encoders,
potentiometers, and LEDs) as well as the microcontroller (MCU) and parameter storage (EEPROM and
FLASH). It also includes the 32-bit DSP assembly, which processes all AF and IF signals. See Theory of
Operation, Front Panel and DSP, in the K3 Owner’s Manual.
Front Panel Assembly Procedure
CAUTION
Do not use inside tooth lock washers where split lock washers are specified. Inside tooth lock
washers are slightly larger and may short nearby circuit pads.
Mount three standoffs on the back of the front panel board as shown in Figure 33 . Place the lock washer
between the screw head and the board as shown.
ESD SENSITIVE!
4-40
5/8" (15.9 mm)
STANDOFF
CIRCUIT
BOARD
#4 SPLIT LOCK
WASHER
BETWEEN 4-40 1/4" (6.4 mm) ZINC
SCREW HEAD PAN HEAD SCREW
AND BOARD.
Figure 33. Preparing the Front Panel Board for Mounting, Part 1.
26
On the front side of the board, mount four standoffs as shown in Figure 34.
IMPORTANT!
1. Place the split lock washers between the standoff and board as shown in the figure.
This is important to establish the correct spacing between the board and the front
panel.
2. Note that the two standoffs near the LCD use smaller #2 hardware.
ESD SENSITIVE!
2-56
5/16" (7.9 mm)
STANDOFF
#2 SPLIT
LOCK WASHER
BETWEEN
BOARD AND
STANDOFF
CIRCUIT
BOARD
NOTE
DIFFERENT
HARDWARE
SIZES!
#4 SPLIT
LOCK
WASHER
BETWEEN
BOARD AND
STANDOFF
2-56 1/4" (6.4 mm) BLACK
PAN HEAD SCREW
4-40
5/16" (7.9 mm)
STANDOFF
CIRCUIT
BOARD
4-40 1/4" (6.4 mm) ZINC
PAN HEAD SCREW
Figure 34. Preparing the Front Panel Board for Mounting, Part 2.
Inspect the front panel board to verify the following:
Three 4-40 5/8” (15.9 mm) standoffs are mounted on the back as shown in Figure 33.
Two 4-40 5/16” (7.9 mm) standoffs are mounted on the front as shown in Figure 34.
Two 2-56 5/16” (7.9 mm) standoffs are mounted on the front as shown in Figure 34.
27
Install the two soft foam light blockers at the ends of the LCD display as shown in Figure 35. Remove the
paper strip covering the adhesive on each blocker and stick that side against the board (or the lip at the base of
the switch buttons) so it stands up between the switches and the LCD. Cover the terminals at the right hand end
of the LCD as shown. The blockers should be nearly flush with the front edge of the LCD to block the excess
light that leaks out of each end of the display.
POSITION LIGHT BLOCKER AT EACH END OF
THE LCD DISPLAY WITH ADHESIVE SIDE TOWARD FRONT PANEL BOARD
COVER THE TERMINAL AT THIS END OF THE LCD
Figure 35. Installing LCD Light Blocker.
Use your Digital Multimeter (DMM) to measure the resistance between the hardware and circuit points
shown in Figure 36 to ensure the hardware is not causing a short. If either reading is lower than shown, loosen
the hardware and adjust its position as needed..
GREATER THAN
500 OHMS
BETWEEN VIA
AND SCREW
GREATER THAN
1 MEGOHM
BETWEEN L3
SOLDER PAD
AND STANDOFF
SEE NOTE
NOTE:
DEPENDING UPON YOUR
DMM, IT MAY READ INF (INFINITY)
OR A WHATEVER IT DISPLAYS
IN OHMS RANGE WHEN WHEN THE
LEADS ARE NOT TOUCHING
ANYTHING (SEE YOUR DMM
MANUAL IF IN DOUBT). THESE ARE
ALL ACCEPTABLE READINGS.
MEASUREMENT A
FRONT OF BOARD
BELOW LCD
MEASUREMENT B
BACK OF BOARD
NEAR J32
Figure 36. Front Panel Board Resistance Measurements.
Locate the front panel and inspect the inside surface for any masking tape covering the holes left during the
painting process. If any is found peel it off.
28
Place the front panel board face up on your work surface, then set the front panel over it as shown in
Figure 37. Check the following:
The MIC connector is in the hole and its flange is not caught behind the panel. The flange
should be slightly above the panel as shown. It may be a snug fit requiring you to press it into
place. If the MIC connector refuses to fit through the hole in the front panel, use a sharp tool to
carefully remove the paint from the inside edge where the connector is binding against the hole.
Work from the inside of the front panel to avoid damaging the paint on the front edge of the
MIC connector hole.
The LEDs above the four controls under the LCD display and above the control in the lower
right corner of the panel are positioned in their openings. If necessary, gently adjust the position
of the LEDs.
Secure the front panel to the board with a 4-40 3/16” (4.8 mm) black flat head screw above the control
opening near the right end and a 1/2” (13mm) nut and inside tooth lock washer on each concentric pot bushing
near the left end as shown. Tighten the screw and nuts only until you feel firm resistance. Be very careful not to
scratch the front panel.
FLANGE OF MICROPHONE JACK
ABOVE FRONT PANEL
1/2" (13 mm) NUTS AND
INSIDE TOOTH LOCK WASHERS
4-40 3/16" (4.8 mm) BLACK
FLAT HEAD SCREW
Figure 37. Mounting the Front Panel on the Front Panel Board.
Two identical encoder assemblies are provided for VFO A and VFO B. Select one encoder and place a 1/2”
(13mm) inside-tooth lock washer over the threaded shaft as shown in Figure 38. This will be the VFO A
encoder.
1/2" (13 mm)
INSIDE TOOTH
LOCK WASHER
Figure 38. VFO A Encoder Assembly Preparation for Installation.
29
Place the VFO A encoder in the opening near the center of the front panel board so the shaft protrudes
through the opening under the LCD. Be careful to avoid dropping the lock washer into to the space between the
front panel board and the front panel. Normally, the lock washer hangs on the threads while you put the encoder
in place. Optionally, you can hold the encoder with the shaft upright and place the front-panel assembly over it
until the shaft is through the hole. Orient the encoder so the pins mate with connector J33 on the front panel
board as shown in Figure 39.
ENCODER FITS INTO FRONT PANEL
BOARD CUTOUT.
ENCODER PINS MATE
WITH CONNECTOR
ON FRONT PANEL
BOARD.
Figure 39. Mounting VFO Encoders.
Place a 1/2” (13mm) inside tooth lock washer and nut on the threaded shaft of the VFO A encoder and
tighten them against the front panel. Take care not to damage the front panel paint with your tools.
Place a 1/2” (13mm) nut on the threaded shaft of the remaining encoder and screw it up against the shoulder
on the encoder bushing as shown in Figure 40.
1/2" (13 mm)
NUT
Figure 40. VFO B Encoder Assembly Preparation for Installation.
Place the VFO B encoder in the opening near the end of the front panel board so the nut rests against the
inside of the front panel and the encoder pins mate with J34. The connectors may not mate fully, leaving a very
small area of the pins showing. That is normal.
Place a 1/2” (13mm) inside tooth lock washer and nut on the threaded shaft of the VFO B encoder and
tighten them against the front panel. Take care not to damage the front panel paint with your tools.
Place a second 1/2” (13mm) nut on the VFO A encoder shaft under the LCD and tighten it against the nut
you installed earlier (see Figure 41).
Locate the clear plastic LCD display cover and VFO A trim panel. They may have an adhesive paper
covering them for protection. If so remove it. If needed, wash the them in warm water with mild soap. To avoid
etching or scratching the surface, do not use harsh detergents or wipe them with paper towels.
30
CAUTION!
In the following steps you will attach the plastic LCD cover and VFO A trim panels to the
front cover using small screws. Do not over-tighten these screws. Tighten the screws only to
the point were you feel some resistance. It is very easy to strip the threads, especially the
screws holding the LCD cover. If you strip these threads the only remedy is to obtain a new
front panel!
Brush or blow any dust or lint away from the front panel area around the encoder shaft under the LCD, then
mount the trim panel as shown in Figure 41, oriented so the beveled edges are away from the front panel.
Tighten the screws only until they come into firm contact with the trim panel. Be careful not to over-tighten the
screws or you may strip the threads or break the trim panel!
SECOND 1/2" (13 mm)
NUT ADDED TO THIS
ENCODER SHAFT ONLY
2-56 1/4" (6.4 mm) BLACK
PAN HEAD SCREWS
DO NOT OVER-TIGHTEN
THE SCREWS! DOING
SO MAY STRIP THE
THREADS AND RUIN
THE FRONT PANEL OR
BREAK THE TRIM PANEL.
4-40 3/16" (4.8 mm)
BLACK FLAT HEAD
SCREW
BEVELED EDGE FACING
AWAY FROM FRONT PANEL
Figure 41. Mounting VFO A Trim Panel.
Ensure the LCD cover is free of dust, smudges and fingerprints. Check the screw holes to be sure they are
clear of any bits of plastic that might be dislodged during installation. The screws should side easily through the
holes. Running them back and forth through the holes should loosen the fit if they are tight.
Mount the cover over the LCD as shown in Figure 42 oriented so the beveled edges are away from the
panel. If the cover seems to bind against the VFO A trim panel, rotate it so the long edge striking the trim panel
is at the top and, if necessary, work the screws through the holes some more to loosen the fit. Tighten the screws
only until they come into firm contact with the trim panel. Be careful not to over-tighten the screws or you may
strip the threads in the front panel or break the LCD cover. These threaded holes in the front panel are easy
to strip!
DO NOT OVER-TIGHTEN
THE SCREWS! DOING
SO MAY STRIP THE
THREADS AND RUIN
THE FRONT PANEL OR
BREAK THE LCD COVER.
2-56 5/32" (4.0 mm) BLACK
PAN HEAD SCREWS
Figure 42. Installing LCD Cover.
31
Place the larger of a pair of concentric knobs over the RF/SQL - SUB control as follows (See Figure 43):
CAUTION!
Do not over-tighten the set screws in the knobs in the following steps or you may crack the
knobs! Use only enough torque to hold the knobs in place.
Turn both shafts fully clockwise
Place the larger knob over the shafts. Do not tighten the set screw yet.
Place the smaller knob over the shaft, align its index line as shown in Figure 43 and tighten one set
screw with a 0.050” Allen wrench.
Rotate the larger knob so its index line is aligned with the index mark in the smaller knob, then lift it
gently so it does not bind against the control bushing or the upper knob and tighten one set screw.
Rotate both knobs about half way counter-clockwise and tighten the second set screw in each knob.
Rotate the smaller and larger knobs over their entire range to see if moving one knob moves the
other at any point in the rotation. If it does, loosen the set screws on the larger knob and move it
slightly toward the panel until the knobs operate independently over their entire range of movement.
POSITION LARGER KNOB
SO IT DOES NOT BIND
AGAINST FRONT PANEL
OR UPPER KNOB.
TIGHTEN TWO
SET SCREWS
IN EACH KNOB
WHEN POSITIONED AT
EITHER STOP THE INDEX
MARKS WILL BE JUST PAST
THE LAST PANEL MARKING.
Figure 43. Mounting Concentric Knobs.
Place a pair of concentric knobs over the AF-SUB controls in the same manner as you installed the
RF/SQL-SUB knobs. Don’t forget to start by turning both shafts fully clockwise.
32
Press small knobs on the four controls under the left end of the LCD: SHIFT/LOW, HI/WIDTH,
SPEED/MIC and CMP/PWR. These knobs are all the same size. The four controls are encoders that rotate
continuously, so the knobs have no index marks. The knobs are held in place by a friction spring as shown in
Figure 44. Align the flat in the knob with the flat on each shaft before pressing each knob in place. In addition to
the rotating encoder, each knob has a switch that is actuated by pressing the knob toward the panel. You will
feel the switch action when you press each knob onto the shaft.
If a knob feels very loose, check to see if the metal friction spring insert is in place as
shown below. If not it should be in the bag with the knobs. Slide the spring insert into the
knob and place it on the shaft. Friction will hold it and the knob securely once it is mounted.
FRICTION SPRING
INSERT
ALIGN FLAT
IN KNOB WITH
FLAT ON
SHAFT
Figure 44. Mounting Friction Knobs.
In the same manner, mount the slightly larger friction knob onto the RIT/XIT control in the lower right
corner of the front panel. The RIT/XIT control does not have the switch action of the other four encoders.
Mount the large knob on the VFO A encoder shaft below the LCD as shown in Figure 45. Before adding
the finger grip, adjust the position of the knob against the felt washer to produce the desired amount of drag for
smooth movement without the knob turning too freely.
1
PLACE ONE FELT
WASHER OVER
THE ENCODER
SHAFT.
2
PLACE THE KNOB ON THE
SHAFT SO IT HAS THE DESIRED
AMOUNT OF DRAG AGAINST
THE FELT WASHERS AND
TIGHTEN THE SET SCREW
WITH A 5/64" (2 mm) ALLEN
WRENCH.
3
Figure 45. Mounting the VFO A Tuning Knob.
33
SLIDE THE RUBBER FINGER
GRIP OVER THE KNOB.
Mount the last knob on the VFO B encoder shaft to the right (under the pushbutton switches) as shown in
Figure 46. Before tightening both set screws, adjust the position of the knob against the felt washer to produce
the desired amount of drag for smooth movement without the knob turning too freely.
1
PLACE ONE FELT
WASHER OVER
THE ENCODER SHAFT
SO THE NUT SHOWS
THROUGH THE
CENTER.
2
PLACE THE KNOB ON THE SHAFT
SO IT HAS THE DESIRED AMOUNT
OF DRAG AGAINST THE FELT
WASHER AND TIGHTEN BOTH
SET SCREWS WITH A 5/64" (2 mm)
ALLEN WRENCH.
Figure 46. Mounting the VFO B Knob.
Mount the DSP board on the front panel board as follows. When you are done, the front panel assembly
will look like Figure 47.
ESD SENSITIVE: Wear a grounded wrist strap or touch an unpainted metal ground
before touching the DSP or front panel boards.
Place the front panel assembly face down on a soft, clean surface to protect the finish. The back
side of the front panel board should be facing upward.
Position the large flat washer on the inside of the front panel over the PHONES jack hole (see
Figure 48 on page 35). This is easily done by sliding the washer into place from the end of the
front panel.
Gently position the DSP board on the front panel board so that the large jack fits through the
cutout in the front panel board with the threaded section passing through the large flat washer
and the circular opening in the front panel. Adjust the position of the board as needed so you
can see the standoffs on the front panel board lined up with the screw holes in the DSP board.
Pick up the assembly while holding the DSP board in place and inspect the position of the two
male plugs on the DSP board. They should mate with J31 and J32 on the front panel board. J31
is near the encoder for VFO A and J32 is between the two dual potentiometers. Adjust the DSP
board’s position as needed so the pins enter the corresponding holes in the sockets on the front
panel board.
Squeeze the boards together while ensuring the pins are mating with the connectors until the
DSP board is resting against the three standoffs on the back of the front panel board that you
installed earlier. The two connectors will not mate completely. About 1/4” (6.4mm) of the pins
may be visible when the DSP board is positioned against the standoffs. There are other
connectors on the DSP board as well, but the two that mate with J31 and J32 are the only ones
that connect between the front panel and DSP boards.
34
Secure the DSP board to the front panel board with three 4-40 1/4” (6.2 mm) zinc pan head
screws and split lock washers as shown in Figure 47.
ESD SENSITIVE!
4-40 1/4" (6.4 mm)
ZINC PAN HEAD
SCREW (3 PLACES)
#4 SPLIT LOCK
WASHER (3 PLACES)
STANDOFF
ON FRONT PANEL
BOARD
DSP
BOARD
Figure 47. Mounting the DSP Board.
Screw the knurled nut onto the threaded shaft of the PHONES jack where it exits the front panel (see Figure
48). Screw it only finger tight. Do not use pliers.
LARGE WASHER IN
POSITION OVER
PHONES JACK HOLE
INSIDE THE FRONT
PANEL
KNURLED
NUT
Figure 48. Phones Jack Hardware.
35
Remove both side panels from the chassis as follows. This will allow you to see the connectors that must
mate properly when attaching the front panel assembly.
Remove the two screws shown in Figure 49 so the 2D connector and standoff remain attached
to the side panel. Remove the remaining screws in the right side panel to free it.
Remove all of the screws in the left side panel (except the two screws holding the handle
assembly) to free it.
REMOVE THIS SCREW
AND LOCK WASHER
REMOVE
THIS
SCREW
KANT3 OR
OPTIONAL
KAT3 BOARD
Figure 49. Removing Right Side Panel Hardware.
ESD SENSITIVE: Wear a grounded wrist strap or touch an unpainted metal ground
before handling the RF Board in the following steps.
Turn the chassis upside down and position the front panel so the pins of P30 and P35 on the bottom of the
RF board just begin to engage the connectors on the lower edge of the front panel assembly. Do not fully mate
them yet.
POSITION THE FRONT PANEL ASSEMBLY SO THESE CONNECTORS BEGIN
TO ENGAGE, BUT DO NOT TRY TO MATE THEM FULLY YET.
BOTTOM VIEW
Figure 50. Mounting Front Panel Assembly - Connectors P30 and P35.
36
Look at the two multi-pin connectors on the top of the RF board to see if they are engaging the
corresponding connectors on the front panel assembly (see Figure 51). Adjust the position of the RF board or the
front panel assembly to ensure they are mating properly.
ADJUST POSITION OF FRONT PANEL AND RF BOARD
SO THE PINS OF BOTH CONNECTORS ENGAGE
LEFT SIDE
RIGHT SIDE
IF THIS SCREW STRIKES THE OPENING IN THE
DSP BOARD, REMOVE IT UNTIL THE FRONT
PANEL CONNECTORS ARE MATED.
Figure 51. Mounting Front Panel Assembly - Connectors P50 and P51.
With the pins of all four connectors started, press the front panel onto the RF board connectors. Press only
from the bottom of the front panel to avoid flexing the RF board. You can use your fingers to press on the back
side of each multi-pin connector on the top of the RF board while holding the front panel to engage them. There
may be small areas of pins showing even after they are mated. You will know they are properly mated when the
screw holes on the bottom lip of the front panel assembly line up with the screw holes in the 2D fasteners on the
bottom of the RF board.
REMOVING THE FRONT PANEL: If you need to remove the front panel assembly,
remove the five screws holding it to the chassis (three on the top lip and two on the bottom),
turn the unit upside down and use a screwdriver in the two pry slots provided as shown in
Figure 52. Do not insert the screwdriver deep enough to strike components on the boards!
Pry each end in short increments until the connectors separate. Either a blade (as shown) or
Phillips screwdriver may be used. Note that you may need to remove the left side panel and
the 2D mounting screw shown in Figure 51.
PLACE A SCREWDRIVER
IN THE NOTCH PROVIDED
AT EACH END OF THE
FRONT PANEL SO IT PRESSES
AGAINST THE EDGE OF THE
RF BOARD TO PRY THE
FRONT PANEL ASSEMBLY
LOOSE
REMOVE THE FIVE
SCREWS HOLDING
THE FRONT PANEL
ASSEMBLY (ONE AT
EACH CORNER AND
ONE AT THE CENTER
OF THE UPPER LIP)
Figure 52. Removing the Front Panel.
37
Secure the front panel assembly at the bottom lip to the 2D fasteners at the forward edge of the RF board
with two 4-40 3/16” (4.8 mm) black pan head screws.
If you removed the screw from the 2D fastener as shown in Figure 51, replace it and the lock washer.
Replace the right side panel (the panel with the feet) as follows:
Start four 4-40 3/16” (4.8 mm) black flat head screws through the side panel: three along the
bottom and one at the front top. Make the threads have engaged, but do not tighten them yet.
Start one 4-40 3/16” (4.8 mm) black flat head screw through the rear panel into the 2D fastener
shown in Figure 49.
Start one 4-40 3/16” (4.8 mm) black flat head screw at the top right corner of the front panel
assembly, nearest the side panel.
Tighten all six screws
Replace the 4-40 1/4” (6.4mm) zinc pan head screw holding the KANT3 (or KAT3) board
shown in Figure 49.
Attach voltage regulators U13 and U12 to the right side panel as shown in Figure 53 using a 4-40 3/8” (9.5
mm) black flat head screw, #4 inside tooth lock washer and a #4 nut for each regulator as shown. When the
screws are tightened the tabs on U12 and U13 should lie flat against the side panel.
SIDE PANEL
4-40 3/8" (9.5 mm) BLACK
FLAT HEAD SCREW
U13
U12
SIDE
PANEL
#4 NUT
#4 INSIDE TOOTH
LOCK WASHER
U12
OR
U13
FRONT PANEL
SHIELD
RF BOARD
Figure 53. Attaching U12 and U13 to the Right Side Panel.
Replace the left side panel (with the handle) as follows:
Start the six 4-40 3/16” (4.8 mm) black flat head screws through the panel: three along the bottom, one
at the top rear, one at the top front, and one just below the front end of the handle. It is normal to adjust
the position of the panels slightly when assembling so the screw holes line up. The cabinet will become
structurally sound and rigid with all the panels, including the top and bottom covers, are mounted.
Start one 4-40 3/16” (4.8 mm) black flat head screw at the top corner of the front panel assembly.
Tighten all seven screws. Be sure all the screws are tight, including the screw near the forward end of
the handle that threads into the front panel shield.
Fasten the top center of the front panel assembly to the front panel shield with a 4-40 3/16” (4.8 mm) black
flat head screw.
38
Resistance Checks
The following resistance checks confirm that the main power busses in the K3 aren’t shorted to ground. If any of
the values measured are lower than specified, inspect the unit carefully for loose hardware that is caught
between components on the boards or for improperly mated connectors.
Use your digital multimeter (DMM) to measure the resistance across the red and black 12VDC IN
connectors on the rear panel. The resistance should be greater than 50K ohms. It may be much higher,
depending upon which way you connect the leads. Your DMM may indicate the value is so high it is out of the
range of the instrument and as it does when in ohms mode and the probes are not touching anything. If you are
not sure, refer to your DMM instruction manual to interpret the reading.
Use your DMM to measure the resistance between the end of R36 and ground at the exposed copper around
the screws for the 2D fastener (see Figure 54). The resistance must be greater than 150 ohms.
KANT3 OR
KAT 3
BOARD
R36 TEST POINT
GROUND
Figure 54. R36 Test Point.
Use your DMM to measure the resistance between the terminal on U12 and ground shown in Figure 55 .
The resistance must be greater than 500 ohms.
Use your DMM to measure the resistance between the terminal on U13 and ground shown in Figure 55.
The resistance must be greater than 150 ohms.
GROUND
GROUND
RIGHT
SIDE
PANEL
FRONT
PANEL
SHIELD
U12
U13
Figure 55. U12 and U13 Test Points.
39
Initial Power On Check
The following check confirms that the power supply and power control circuits are working properly. Be sure
your K3 passes the resistance tests above before proceeding.
CAUTION!
If you see or smell smoke when applying power, turn the K3 off and remove the power
cable immediately, then locate the source.
Connect your 13.8 VDC power supply to the 12VDC IN connector on the rear panel. Do not connect a key,
microphone or other accessories to the K3 at this time.
Tap (press for less than 1/2 second) the front panel P O W E R button and confirm the LCD display lights.
There may be a delay of about 1 second before the display lights. Some front panel LEDs may light as well, and
you may notice D33 on the RF board, next to the crystal filters, light. Ignore any error messages on the display
and do not try to operate the radio at this time. You’ll get to do that soon.
Tap the front panel P O W E R button again to turn the K3 off and disconnect your external power supply.
KREF3 Reference Oscillator
KREF3 Description
The KREF3 module’s 49.380-MHz temperature-compensated crystal oscillator (TCXO) is the common
reference for the K3’s synthesizers. See Theory of Operation, KREF3, in the K3 Owner’s Manual for more
information.
KREF3 Installation Procedure
Prepare the KREF3 oscillator module for installation as follows:
If you are installing the optional 1-ppm TCXO module, skip this step. When installing the standard 5ppm oscillator module, check the lead lengths as shown in Figure 56. If longer than shown, use your
diagonal cutters to trim them to length. The objective is to cut the leads only as necessary for the module
to fully seat in the socket as shown in Figure 57. Do not cut the leads shorter than necessary or your
oscillator may not work.
1/8" TO 5/32" (3.2 to 4.0 mm)
NOTE:
SOME MODULES HAVE
ONLY THREE LEADS.
Figure 56. Preparing TCXO Module Leads.
If you are installing the optional 1-ppm TCXO module, place the white insulator supplied with the
oscillator over the leads so it rests between the module and the socket when it is installed in the next
step. This insulator is not required on the 5-ppm TCXO module.
40
Mount the TCXO module on the KREF3 board as shown in Figure 57. The bottom of the module
should rest against the socket. Be certain the leads go into the corner holes in the socket and the black dot is
oriented toward connector J6 as shown. If you have a 1ppm high-stability module, the dot may be light
brown and not as close to the corner. If the module has only three leads, the missing lead will be in the
corner with the dot.
LOCK TIE WRAP
HERE TO AVOID
INTERFERING WITH
CONNECTORS J5 AND J6
3
2
PLACE TIE WRAP
UNDER SOCKET
ESD SENSITIVE!
1
INSERT PINS IN
CORNER HOLES
IN SOCKET WITH
THE DOT IN THIS
POSITION
Figure 57. Mounting TCXO Module on KREF3 Board.
Inspect the bottom of the KREF3 to ensure no leads are higher than the chokes as shown below. The chokes
are the highest of the black surface-mount components on the board. Use your diagonal cutters to trim any
excessively long leads close to the board.
CAUTION
The objective is to be certain no bare leads touch the front panel shield when the board
is installed in the next step. Do not add spacers or insulating material between the board
and the front panel shield. It is important for proper shielding of the circuits that the
board sit very close to the front panel shield.
ESD SENSITIVE!
TRIM PINS AND LEADS
AS NEEDED TO ENSURE
NONE ARE AS HIGH AS THESE
CHOKES (SEE TEXT)
Figure 58. Checking Lead Lengths on KREF3 Board.
41
Install the KREF3 board on the back side of the front panel shield as shown in Figure 59. The KREF3 board
plugs into J75 on the RF board. Be sure you have the KREF3 board connector aligned with J75 so that all the
pins mate with the connector.
3
SECURE WITH A
4-40 1/4" (6.4 mm)
ZINC PAN HEAD SCREW.
PLACE AN INSIDE
TOOTH LOCK
WASHER UNDER
THE SCREW HEAD.
2
SLIDE J3 THROUGH
THE HOLE IN THE
FRONT PANEL
SHIELD.
1
INSERT P75 ON
KREF3 INTO J75
ON THE RF BOARD.
Figure 59. Installing KREF3 Board.
KSYN3 Synthesizer
KSYN3 Description
The KSYN3 module is a high-performance, wide-range synthesizer covering 8 to 46 MHz. It uses a crystalfiltered DDS (direct digital synthesis) reference. This in turn drives a VCO with a high C/L ratio, resulting in
very low phase noise. See Theory of Operation, KSYN3, in the K3 Owner’s Manual for more information.
KSYN3 Installation Procedure
Inspect the bottom of the KSYN3 board to ensure no leads are higher than the chokes as shown below. The
chokes are the highest of the black surface-mount components on the board. Use your diagonal cutters to trim
any excessively long leads close to the board.
CAUTION
The objective is to be certain no bare leads touch the front panel shield when the board
is installed in the next step. Do not add spacers or insulating material between the board
and the front panel shield. It is important for proper shielding of the circuits that the
board sit very close to the front panel shield.
TRIM PINS AND LEADS
AS NEEDED TO ENSURE
NONE ARE AS HIGH AS THESE
CHOKES (SEE TEXT)
ESD SENSITIVE!
Figure 60. Checking Lead Lengths on KSYN3 Board.
42
Install the KSYN3 board on the back side of the front panel shield as shown in Figure 61. The KSYN3
board plugs into J73 on the RF board. Be sure the connectors are aligned so that all the pins go into the
corresponding socket holes on J73.
2
SECURE WITH 4-40 1/4" (6.4mm) ZINC PAN HEAD SCREWS. PLACE
AN INSIDE TOOTH LOCK WASHER UNDER EACH SCREW HEAD.
ESD SENSITIVE!
1
INSERT P73 ON THE KSYN3 BOARD
INTO J73 ON THE RF BOARD.
Figure 61. Installing the KSYN3 Board.
Locate the three TMP cables. They are 1/4” (6.4mm) diameter coaxial cables with connectors at each end as
shown in Figure 62.
FINGER GRIP
DO NOT PULL
ON CABLE!
1/4" (6.4 mm)
COAXIAL CABLE
FEMALE CONNECTORS
COAX SHIELD
CONNECTED
TO SHELL
COAX CENTER WIRE
CONNECTED TO PIN
PLUG FULLY
INSERTED
Figure 62. TMP Cable Connectors.
43
Install the three TMP cables between connectors on the KREF3 board, the main RF board and the KSYN3
board as follows. Handle the connectors by the finger-grip area shown in Figure 62, especially if you unplug a
connector. Do not pull on the coaxial cable to unplug a connector! When mating the connectors, be sure the
plugs are fully inserted as shown in Figure 62. To make the connectors easier to mate, first be sure the center pin
is started in the socket, then you may twist the connector back and forth while holding it by the metal ears if
needed to seat if fully as shown in Figure 62.
KREF3 board J7 to RF board J65.
KREF3 board J6 to RF board J81.
KREF3 board J2 to KSYN3 board J83.
J2
J6
KREF3
KSYN3
J83
J65
J81
RF BOARD
J7
Figure 63. Installing KREF3 TMP Cables.
Loudspeaker
Loudspeaker Description
The built-in loudspeaker is mounted on the top cover. A grill cloth covering the sound holes keeps dust and
debris from falling into the speaker cone. The loudspeaker is equipped with a magnetic shield to avoid unwanted
interaction with nearby circuits.
Loudspeaker Installation Procedure
Locate the top cover and check the inside for any masking tape still covering screw holes. If found, peel it
off.
44
Mount the chassis stiffening bracket on the underside of the cover as shown in Figure 64. Do not use
washers.
CHASSIS STIFFENER
TOP COVER
INSIDE SURFACE
4-40 3/16" (4.8 mm)
BLACK FLAT
HEAD SCREW
(3 PLACES)
SPEAKER GRILL OPENINGS
Figure 64. Attaching Chassis Stiffener to Top Cover.
Trim the grill cloth to cover the speaker grill openings and overlap the four holes for the loudspeaker
mounting screws. Mark and cut four holes in the grill cloth for screws to pass through the cloth. The grill cloth
is shown as it must fit after the speaker is mounted in Figure 65. If you install the KPA3 100-watt amplifier, the
stiffener will be attached to the chassis and cannot be removed with the cover. In that case, the grill cloth must
be trimmed as shown so it cannot become trapped between the chassis stiffener and the top cover.
CAUTION!
Failing to install the fiber washers as shown in the next step or over-tightening the screws so
that the speaker mounting flanges are distorted may damage the speaker, causing distorted,
fuzzy sound.
Mount the speaker using the hardware shown in Figure 65. A suggested procedure for doing this is as
follows:
Find a book or other flat-smooth surface that is about the size of the top cover.
From the top, place the screws in the four holes at the corners of the speaker grill area.
Cover the screw heads with the book and, holding it in place against the top cover, invert the
cover and lay it with the book on your work table so the bottom side is facing upwards.
Trim and cut screw holes in the grill cloth as needed and position it over the four screws that are
now held in place by the book. Trim the grill cloth so the cloth does not touch the stiffener.
Place a fiber washer on each screw so it rests on the grill cloth.
Position the loudspeaker on the four screws so they pass through the holes in the flanges. Orient
the speaker so the wire exits toward the rear (the side nearest the stiffener).
Place a #4 internal tooth lock washer on each screw.
Start a 4-40 nut on each screw.
Pick up the entire assembly and tighten all four screws. Do not tighten the screws enough to
bend the speaker flanges!
45
SPEAKER WIRE EXITS
TOWARD REAR
STIFFENER
TRIM AND POSITION GRILL CLOTH SO
IT DOES NOT TOUCH STIFFENER
#4 INTERNAL TOOTH
LOCK WASHER
#4 NUT
SPEAKER MOUNTING
FLANGE
FIBER
WASHER
GRILL CLOTH
TOP COVER
4-40 3/8" (9.5 mm) BLACK
FLAT HEAD SCREW
Figure 65. Mounting Loudspeaker.
Install the shield over the speaker magnet as shown in Figure 66.
2
PLACE THE SHIELD OVER THE SPEAKER
MAGNET AND PRESS THE ADHESIVE PAD
AGAINST THE BACK OF THE MAGNET.
DO NOT PRESS HARDER THAN NEEDED
1
REMOVE PAPER COVER
FROM ADHESIVE PAD INSIDE
THE SHIELD.
OR YOU MAY BEND THE FRAME AND RUIN THE
SPEAKER.
Figure 66. Installing Speaker Magnet Shield.
46
KPA3 Shield
If you are not planning to install the KPA3 module at this time, skip this section and go directly to Bottom Cover
on page 49. The Only the KPA3 shield is installed at this time to avoid rework later. You will be directed to
finish installing the KPA3 module after initial testing and calibration of your K3.
KPA3 Shield Description
The KPA 3 Shield is part of the optional KPA3 100-watt amplifier module. It isolates the high-level RF circuits
in the KPA3 from the rest of the K3 and provides mechanical support for the amplifier module itself.
KPA3 Shield Installation Procedure
Remove the shield from the KPA3 Option kit and position it over the holes in the RF board as shown in
Figure 67. The holes in the shield must line up with the holes in the RF board.
SET THE SHIELD ON THE RF BOARD WITH
THE REAR FOOT ABOVE THE LPA BOARD
CONNECTOR, THEN MOVE IT BACK UNTIL
THE REAR FOOT SITS ON THE THE
RF BOARD AND THE SHIELD IS AGAINST
THE REAR PANEL.
Figure 67. Positioning the KPA3 Shield.
47
Attach the shield to the RF board and to the rear panel as shown in Figure 68. The screws, washers and nut
are in the KPA3 Option kit. The standoffs are part of the K3 kit hardware.
4-40 3/8" (9.5 mm) BLACK FLAT HEAD SCREW
WITH #4 INSIDE TOOTH LOCK WASHER AND
#4 NUT INSIDE.
SHIELD
4-40 1/4" (6.4 mm) ZINC
PAN HEAD SCREW
#4 INSIDE TOOTH
LOCK WASHER
RF
BOARD
1/4" (6.4 mm) STANDOFF
USE 1/4" (6.4 mm)
SCREWS SUPPLIED WITH
KPA3 OPTION.
LOCK WASHERS AND STANDOFFS
ARE SUPPLIED WITH THE K3.
Figure 68. Attaching the KPA3 Shield.
Remove the stiffener bar from the top cover and install it on the chassis as shown in Figure 69. The screws,
lock washers and nuts required to attach it to the shield are in the KPA3 Option kit. The black screws used to
attach it to the side panels are part of the K3 kit hardware.
4-40 BLACK FLAT HEAD SCREWS
(PART OF KPA3 OPTION KIT)
4-40 1/4" (6.4 mm) ZINC PAN HEAD SCREWS
WITH SPLIT LOCK WASHERS AND #4 NUTS
(PART OF K3 KIT HARDWARE)
Figure 69. Installing the Chassis Stiffener Bar.
48
Bottom Cover
Bottom Cover Description
The bottom cover is divided into two parts, the rear and forward sections. The rear section is thicker than the
forward section to act more efficiently as a heat sink for the LPA transistors. The bottom covers attach to
standoffs as well as the 2D fasteners on the bottom of the RF Board. A folding tilt stand and feet are mounted on
the cover panels.
Bottom Cover Hardware Installation
Install the standoffs on the bottom of the RF board shown in Figure 70. If you installed the KPA3 shield,
three of the four standoffs required are already in place. If so, be sure to install the remaining standoff!
*
IF YOU INSTALLED THE KPA3 SHIELD IN THE
PREVIOUS STEP, THESE STANDOFFS ARE
ALREADY IN PLACE. IF SO, BE SURE TO INSTALL
THE REMAINING STANDOFF (LOWER RIGHT
CORNER OF THIS ILLUSTRATION)
4-40 3/16" (16.9 mm) BLACK
PAN HEAD SCREW
*
#4 INSIDE TOOTH
LOCK WASHER
CIRCUIT
BOARD
*
1/4" (6.4 mm) STANDOFF
*
Figure 70. Installing Standoffs on RF Board.
49
Identify the bottom cover forward section by test fitting it on the bottom of the K3. The forward section is
the thinner panel with a notch along one edge (see Figure 71).
One side of the cover is fully painted. That is the outside. The other side has areas of bare metal left to
ensure good electrical contact with the other cabinet parts. Check the inside surface for any masking tape left
from the painting process. If found, peel it off.
Attach one tilt stand foot to bottom cover section A as shown in Figure 71 using a 4-40 7/16” (11 mm) zinc
pan head screw. The foot goes on the fully-painted side of the cover, oriented as shown. Be sure the cut-away
side of the foot is farthest from the edge of the panel and the hole for the tilt stand faces the holes for the other
foot. Use a #4 inside tooth lock washer and #4 nut to secure each screw. Do not tighten the hardware. Start the
nuts onto the screws only a few turns so the foot is free to move about.
CUT-AWAY SIDE TOWARD THE REAR
DO NOT TIGHTEN UNTIL BOTH
FEET AND TILT STAND ARE IN PLACE
FRONT EDGE
OF COVER
4-40 7/16" (11 mm) ZINC PAN HEAD SCREWS,
#4 INSIDE TOOTH LOCK WASHERS AND NUTS
NOTCH
END OF THE TILT STAND
FITS IN HOLE IN THE SIDE
OF THE FOOT
FRONT EDGE
Figure 71. Installing Tilt Stand.
Attach the second tilt stand foot, making sure the ends of the tilt stand are resting in the holes provided in
the feet, then tighten all four screws to secure the feet and stand to the panel.
50
Locate the rear bottom cover section. This cover has eight rectangular slots cut in it. Like the front section
bare metal is exposed in some areas. That side will face inside the K3. The bare metal ensures good electrical
contact with the other cabinet parts and good thermal contact with the heat sinks for Q2, Q4 and Q5 on the LPA
circuit board.
Check the inside surface of the bottom cover for any masking tape that may have been left from the
painting process. If found, peel it off. Two of the screw holes inside bottom cover section B have not had the
paint removed from them. These are the mounting holes for the two rear feet. Attach each foot as shown in
Figure 72.
4-40 7/16" (11 mm)
ZINC PAN HEAD
SCREW
4-40 NUT
#4 INSIDE TOOTH
LOCK WASHER
BOTTOM COVER
FOOT
Figure 72. Installing Rear Feet.
Set both bottom covers aside in a safe place. They will be mounted on the K3 later.
KNB3 Noise Blanker
KNB3 Noise Blanker Description
The KNB3 is one of two noise blanker systems in the K3. It is a narrow I.F. pulse blanker that plugs into the RF
board. See Theory of Operation, Noise Blanker in the K3 Owner’s Manual for more information
KNB3 Installation
Install the standoff for the noise blanker as shown in Figure 73. The location of J77 is to the left of crystal
filter position FL5 on the RF board. Be sure to put two split lock washers between the standoff and the RF board
as shown.
4-40 3/8" (9.5 mm)
STANDOFF
NOISE BLANKER
STANDOFF
TOP OF RF BOARD
CONNECTOR
J77
4-40 SPLIT
LOCK WASHER
ESD SENSITIVE!
Figure 73. Installing Noise Blanker Standoff.
51
TWO 4-40 SPLIT
LOCK WASHERS
4-40 1/4" (6.4mm)
ZINC PAN HEAD
SCREW
Plug the noise blanker board into J77 and attach it to the standoff using the hardware shown in Figure 74.
NOISE
BLANKER
4-40 1/4" (6.4 mm) ZINC
PAN HEAD SCREW
#4 SPLIT LOCK
WASHER
ESD SENSITIVE!
CIRCUIT
BOARD
STANDOFF
ON RF BOARD
Figure 74. Installing the Noise Blanker Board.
Battery BT1
Battery BT1 Description
BT1 is a 3-volt lithium coin cell that provides the operating voltage for the real-time-clock IC (RTC) on the
front panel when the K3 is turned off. Depending on the type of cell, BT1 could last from 2 to 10 years, thanks
to the extremely low current drain of the RTC – on the order of a few microamperes. The RTC keeps track of
the full date and 24-hour time, either of which can be displayed on the VFO B portion of the LCD.
Battery BT1 Installation Procedure
Insert the CR2032 cell into battery holder BT1 as shown in Figure 75.
SLIDE CR2032 CELL
INTO BT1 BATTERY HOLDER
OBSERVE
POLARITY!
ALIGN + SIDE OF
CELL WITH +
ON PC BOARD.
Figure 75. Installing BT1.
52
KBPF3 General Coverage Receive Option
If you have the KBPF3 General Coverage Receive option kit, install the board as follows. Otherwise skip this
section and go directly to Power Amplifier Jumper Block on page 53.
KBPF3 Description
The KBPF3 extends the receive coverage outside of the Ham bands over the range of 500 KHz to 30 MHz and
from 48 MHz through 54 MHz. Only the receiver coverage is extended. The transmitter frequencies remain
limited to the Amateur bands.
KBPF3 Installation
Install the board on the standoffs you installed earlier as shown in Figure 76. The screws and lock washers
needed are supplied with your KBPF3 Option kit. There are three connectors on the bottom of the KBPF3 board
that must be properly mated to P44A, P44C and P44E on the RF board. Even though the connectors are hard to
see if they KPA3 shield is installed, they can be aligned as follows:
Set the KBPF3 board in place over the standoffs, aligning it so the holes in the KBPF3 board
are aligned with the tops of the standoff. This will align the connectors.
Press down on the KBPF3 board to mate the connectors at the end near battery BT1 and along
the side nearest the LPA board or, if installed, the KPA3 shield, while checking to ensure that
the holes in the board are aligned with the holes in the standoffs. Note that simply installing the
mounting screws will not ensure the 3-pin connectors are fully mated. When properly mounted
the KBPF3 board should rest on top of the standoffs and be parallel with the RF board
underneath.
KPA3 SHIELD
(IF INSTALLED)
STIFFENER
NOT SHOWN
FRONT
OF K3
ESD SENSITIVE!
4-40 1/4" (6.4mm) ZINC PAN HEAD SCREW
4-40 SPLIT LOCK WASHER
KBPF3 BOARD
NO LOCK WASHER
BETWEEN KBPF3 BOARD
AND STANDOFF
Figure 76. Installing the KBPF3 Option Board.
53
Power Amplifier Jumper Block
The Power Amplifier (PA) jumper block is required to operate the K3 without the optional KPA3 100 watt
power amplifier module installed. Your RF board was shipped with the jumper block installed. Even if you are
planning to install the KPA3 at this time, do not remove it until instructed to do so. You will be performing
some essential tests and calibration procedures before the KPA3 module is installed.
If you remove it for any reason before installing the KPA3, replace it as shown in Figure 77. Inspect the
position of the jumper block carefully to endure it is mated with the four pins at the ends of both connectors.
Your K3 may be damaged when power is applied if the jumper block is positioned incorrectly!
PA JUMPER BLOCK ENGAGES THE
FOUR PINS AT THE END OF P67A AND P67B
P67A
P67B
CAUTION!
Figure 77. Installing the PA Jumper Block.
Finishing the Enclosure
Even though you may be planning to install the KPA3 100 watt amplifier at this time, you must complete the
enclosure to run some essential tests and calibration procedures first. These tests require the enclosure panels be
in place, particularly the bottom cover that acts as a heat sink for the low power amplifier (LPA) transistors.
Fan Opening Cover
A large opening in the rear panel is provided for fans required to provide cooling air for the KPA3 100-watt
amplifier module.
If you have the KPA3 100-watt amplifier and plan to install it before operating your K3 on the air, you may
leave this panel off. Otherwise, install the larger blank panel in the opening on rear panel with a 3/16” (4.8 mm)
black pan-head screw into the threaded bushing at each corner. Do not use washers under the screws.
54
Bottom Covers
Turn the K3 over so the bottom is exposed. Position the forward section of the bottom with the feet and bail
toward the front as shown in Figure 78. Attach the cover with seven 3/16” (4.8 mm) black pan head screws at
the positions shown. Do not use washers.
NOTE
FORWARD
SECTION
ALL SCREWS EXCEPT THOSE
MARKED "A" ARE 3/16" BLACK PAN
HEAD. DO NOT USE WASHERS.
THE THREE SCREWS MARKED
"A" MUST BE 1/4" BLACK PAN
HEAD WITH INSIDE TOOTH
LOCK WASHERS UNDER THE
SCREW HEADS.
REAR
SECTION
CAUTION!
POWER TRANSISTORS IN '
YOUR K3 MAY FAIL
PREMATURELY IF THE
SCREWS MARKED "A" ARE
NOT INSTALLED WITH
LOCK WASHERS AS SHOWN!
Figure 78. Installing Bottom Covers.
Attach the rear cover section as follows (see Figure 78):
Position the cover so the holes marked A line up with the transistors on the LPA board. The remaining
holes will line up with 2D fasteners and standoffs.
Start three 4-/40 1/4” (6.4 mm) black pan head screws into the transistors through the holes near the
center with a #4 inside tooth lock washer under each screw head. Do not tighten the screws yet.
Start seven 4-40 3/16” (4.8 mm) black pan head screws into the remaining holes. Do not use washers.
Tighten all ten screws.
55
Top Cover
Even if you have the KPA3 100-watt module to install, install the top cover and speaker at this time for initial
testing and calibration of the basic 10-watt K3 configuration.
Connect the speaker cable to P25 of the KIO3 board as shown in Figure 79. If you have the KPA3 shield
installed, route the speaker wire under the stiffener bar.
KIO3 BOARD
IN BACK LEFT
CORNER OF
CHASSIS
ORIENT
CONNECTOR
AS SHOWN
TO SPEAKER
Figure 79. Connecting Speaker to KIO3 Board.
Place the top cover on the K3 with the tab at the rear extending under the lip of the rear panel. Secure the
top cover with six 4-40 3/16” (4.8 mm) black flat head screws along the front and rear edges of the cover. You
may find it necessary to loosen screws at the top of the side, front and rear panels to adjust their position so the
top cover fits properly.
If you have the KPA3 shield installed, place three 4-40 3/16” (4.8 mm) black flat head screws through the
holes across the middle of the cover to secure it to the stiffening bar. If you have not installed the KPA3 shield,
the stiffening bar still is attached to the top cover where you mounted it to measure the speaker grill cloth for
trimming. Place a 4-40 3/16” (4.8 mm) black flat head screw into each side panel to secure the ends of the
stiffening bar.
. The screws that hold the top cover in place are an important part of the structural design
that provides excellent structural rigidity in spite of its light weight. Be sure all the screws are in
place and tight whenever you replace the cover or other panels.
When removing the top cover in the future, the normal procedure is to remove the nine screws
on top, leaving the stiffening bar on the chassis (see Figure 80) . If the KPA3 100-watt amplifier
is installed, this is the only way the top cover can be removed because the rear shield installed
with the KPA3 attaches to the stiffening bar.
56
2
1
1
REMOVE
9 SCREWS
HOLDING TOP
COVER.
3
7
TO OPEN COVER,
PRESS HERE TO
TILT FRONT EDGE UP
6
4
DO NOT
REMOVE THE
FOUR SCREWS
AT THE CORNERS
OF THE SPEAKER
OPENING.
2
OR
8
9
PLACE UNIT
ON ITS SIDE FEET,
THEN TIP FARTHER
SO THE TOP COVER
SWINGS OPEN.
Figure 80. How to Remove the Top Cover.
This completes the assembly of your K3/10 Transceiver. Next perform the Initial Test and Calibration
procedures below to ensure your K3 is operating properly. Once they have been completed you can proceed to
install other options, including the KPA3 100-watt amplifier module, at any time. Each option is supplied with
its own installation manual.
PARTS LEFT OVER?
You may find that you have extra screws, washers or nuts after completing the assembly of your
K3. This is normal. Extras of parts most easily lost during assembly are frequently included.
Test and Calibration
It’s time to apply power! In the following tests and procedures you will check out and calibrate essential
functions of your basic K3. You must complete these procedures before operating your K3 at low power or
before installing a KPA3 100-watt power amplifier option.
Have your K3 Owner’s Manual handy. Detailed procedures are in your Owner’s Manual where you can find
them easily in the future if you need them.
YOUR K3 WILL NOT OPERATE, OR WILL NOT OPERATE CORRECTLY, until
you complete the Test and Calibration procedures below, including:
Synthesizer Calibration.
Filter Setup (all five procedures listed for each filter installed).
Reference Oscillator Calibration.
TX Gain Calibration on all bands.
Using Tap/Hold Switches: Most K3 switches have two functions. Tapping activates the function labeled on
the switch. Holding (~1/2 sec.) activates the function labeled beneath the switch.
Initial Power Checks
Connect your 11-16 VDC power supply to the red and black 12VDC IN connector on the back of your K3.
Don’t connect anything else to your rig until instructed to do so.
57
On the front panel, tap P O W E R to turn the K3 on. The LCD display should illuminate as it did before. It
will probably show an Error message, e.g. ERR PLL or ERR PL1. This is normal! It is reporting that the
synthesizer has not been calibrated. Tap D I S P L AY to clear the error message. Other error messages may follow,
depending upon which modules you have installed, indicating that they have not been initialized yet. Press
display until you have cleared the error messages.
Synthesizer Calibration
Hold C O N F I G to access the configuration menu, then rotate VFO B to display TECH MD. Set the TECH
MD parameter to ON with VFO A.
Refer to the Calibration Procedures in you Owner’s Manual and perform the Synthesizer calibration.
When the calibration process is completed, press the BAND switch to cycle through all the bands from 160
meters through 6 meters and verify that there are no CAL PLL error messages on the display. That indicates that
the synthesizer is calibrated on all the bands.
Filter Setup
Turn to the Crystal Filter Installation and Setup section of your Owner’s Manual and perform the following
procedures. If you have installed standard Elecraft 5-pole filter(s) you will need the FREQ OFFSET data you
recorded earlier on page 12.
x Filter Bandwidth Setup
x Filter Center Frequency Setup
x Receive Filter Enables
x Filter Loss Compensation
x Transmit Filter Selection
The transmit filter selection setup requires that you select a valid transmit filter for each
mode. If you fail to do so, you will see ERR TXF and have no RF output when you attempt
to transmit.
Reference Oscillator Calibration
Turn to the Calibration Procedures, Reference Oscillator section in your Owner’s manual and perform
either of the reference oscillator calibration procedures found there. One of the procedures uses an off-air signal
and requires no external test equipment.
TX Gain Calibration
Turn to the Calibration Procedures, Transmitter Gain section in your Owner’s manual and perform the
Low-Power (5W) TX Gain Calibration procedure.
Option Modules
Enable Modules
Enable the KNB3 noise blanker and, if installed, the KBPF3, KAT3 and KXV3, options modules as
described in the Option Module Enables section of your Owner’s Manual. Even though they are installed, these
modules will not function until they are enabled.
KPA3 100-Watt Amplifier Installation
If you purchased the KPA3 100-watt amplifier option, turn to the KPA3 Option manual Installation
Procedure to complete installation and testing now.
58
Other Calibration Procedures
Wattmeter Calibration (Optional)
The wattmeter is reasonably accurate as it is supplied. However, if you have an accurate external wattmeter you
can adjust the K3 to match its readings at low power (5 watts), high power (50 watts), and, if you have the
KXV3 module installed, at 0.5 milliwatts output at the KXV3 transverter interface. Refer to Calibration
Procedures, Wattmeter in your Owner’s Manual.
S-Meter Calibration (Optional)
The S-meter calibration is normally quite accurate with the default settings provided. If you have an accurate 50ohm, 50-microvolt signal generator (such as the Elecraft XG1 or XG2) you can calibrate the S-meter yourself.
Refer to Calibration Procedures, S-Meter in your Owner’s manual.
59
Appendix A Illustrated Parts List
Your kit contains a number of envelopes, boxes and packages of parts. Check the contents of each one carefully
against the following lists.
Printed Circuit Boards
Each board is packaged in its own ESD-safe bag identified by the part numbers shown below.
CAUTION!
DO NOT DISTURB ANY ADJUSTMENTS ON THE BOARDS
Each board was tested and aligned for optimum performance at the factory. Any change to these
adjustments will degrade the performance of your K3 or prevent its operation altogether. All user
calibrations and adjustments are done in firmware using the front panel menus. These are
described at the appropriate points in the assembly procedures and in the Owner’s Manual.
ILLUSTRATION
DESCRIPTION
QTY
ELECRAFT
PART NO.
Front Panel Printed Circuit
Board Assembly
1
E850242
1
E850233
ESD Sensitive
K3 DSP Printed Circuit
Board Assembly
ESD Sensitive
A-1
ILLUSTRATION
DESCRIPTION
QTY
ELECRAFT
PART NO.
1
E850261
1
E850322
1
E850256
1
E850257
RF Board
ESD Sensitive
PA Jumper Block
Assembly (pre-installed on
RF board)
Low Power Amplifier (LPA)
Board
ESD Sensitive.
K3 Mixer Board
ESD Sensitive.
A-2
ILLUSTRATION
DESCRIPTION
KNB3 Noise Blanker
Board
QTY
ELECRAFT
PART NO.
1
E850280
1
E850248
1
E850254
ESD Sensitive.
KANT3 Antenna Input
Module
Note: This board is not supplied
if you purchased the KAT3
automatic antenna tuner option
with your K3 kit.
KREF3 Board
ESD Sensitive.
A-3
ILLUSTRATION
DESCRIPTION
QTY
ELECRAFT
PART NO.
1
E850260
1
E850237
1
E850236
KSYN3 Board
ESD Sensitive
KIO3 Main Board
ESD Sensitive.
KIO3 Audio I/O Module
ESD Sensitive.
A-4
ILLUSTRATION
QTY
ELECRAFT
PART NO.
1
E850235
QTY
ELECRAFT
PART NO.
Front Panel
1
E100209SS
Left Side Panel
1
E100210
Right Side Panel
1
E100211
Top Cover
1
E100212
DESCRIPTION
KIO3 Remote I/O Module
ESD Sensitive.
E850262 Enclosure
ILLUSTRATION
DESCRIPTION
A-5
ILLUSTRATION
QTY
ELECRAFT
PART NO.
Bottom Cover A
1
E100213
Bottom Cover B
1
E100221
Rear Panel
1
E100214SS
1
E850297
Note: This part is not supplied if
you purchased the KXV3 I/O
option with your K3 kit.
1
E850296
Front Panel Shield
1
E100216
Chassis Stiffener
1
E100222
KIO3 Panel
1
E850315
Loudspeaker with attached
wire and connector
1
E850300
Loudspeaker Shield
1
E980087
DESCRIPTION
Panel, Blank (KPA3 Fans)
Note: This part is not supplied if
you purchased the KPA 100 watt
amplifier option with your K3 kit.
Panel, Blank (KXV3 I/O)
A-6
E850239 K3 FP Encoder Assembly Bag
ILLUSTRATION
DESCRIPTION
Encoder Assembly
QTY
ELECRAFT
PART NO.
2
E850239
E850249 I.F. Crystal Filter Bag (or Box)
NOTE: If the optional 8-pole 2.8K filter is purchased instead (see next item) this filter is not supplied.
QTY
ELECRAFT
PART NO.
1
E850249
Note: May be supplied with a black, 440, 3/16” (4.8 mm), pan head screw
instead
1
E700005
Lock Washer, #4, Inside Tooth
1
E700010
ILLUSTRATION
DESCRIPTION
KFL3A-2.7K Filter
Note: This filter is not supplied if you
purchased the optional 8-pole 2.8 kHz
filter with your K3 kit.
Screw, 4-40, 1/4” (6.4 mm) Zinc, Pan
Head
or
See Note in Description
E850249 I.F. Crystal Filter Bag (or Box)
OPTION: Not supplied unless ordered. Otherwise the standard 5-pole filter (above) is supplied.
DESCRIPTION
QTY
ELECRAFT
PART NO.
KFL3A-2.8K Filter (optional, see above)
1
E850249
Note: May be supplied with a black, 440, 3/16” (4.8 mm), pan head screw
instead.
1
E700005
Lock Washer, #4, Inside Tooth
1
E700010
ILLUSTRATION
Screw, 4-40, 1/4” (6.4 mm) Zinc, Pan
Head
or
See Note in Description
A-7
KREF3 TCXO Module Bag
QTY
ELECRAFT
PART NO.
1
E660033
KREF3 TCXO Module, 49.380 MHz,
(optional) 1 ppm stability (includes
temperature compensation data sheet).
1
E660034
TCXO spacer (supplied only with
optional KTCXO3-1 module)
1
E980146
Tie Wrap, KREF3 TCXO. Module
1
E980145
QTY
ELECRAFT
PART NO.
Bezel (LCD cover), K3
1
E100195
Trim Panel, K3 VFO
1
E100197
Serial Number Label
1
E980137
ILLUSTRATION
DESCRIPTION
KREF3 TCXO Module, 49.380 MHz,
5 ppm stability
Note: This module is not supplied if you
purchased the optional 1 ppm module with your
kit.
Rectangular Insulator the size of the TCXO
E850307 K3 Front Panel Bezels and Serial Number Label
ILLUSTRATION
DESCRIPTION
A-8
E850229 SO239 Ant Connector Assembly Bag
QTY
ELECRAFT
PART NO.
SO239 (UHF) Female Panel Mount
Connector with cable
1
E850229
Screw, 4-40, 1/4” (6.4 mm) Black, Pan
Head
2
E700009
Lock Washer, #4, Inside Tooth
2
E700010
Nut, 4-40
2
E700011
QTY
ELECRAFT
PART NO.
Screw, 4-40, 1/4” (6.4 mm) Black, Pan
Head
4
E700009
Screw, 4-40, 1/4” (6.4 mm) Zinc, Pan
Head
2
E700005
Lock Washer, #4, Inside Tooth
4
E700010
Jackscrew Nut, 4-40
Note: Two of the jackscrew nuts may be
mounted on the DB-9 connector on the
Remote I/O Board.
4
E700078
Standoff, 4-40, 1-1/4” (31.8 mm) long
2
E700119
ILLUSTRATION
DESCRIPTION
E850238 KIO3A Hardware Bag
ILLUSTRATION
DESCRIPTION
A-9
E850263 K3 Miscellaneous Bag
QTY
ELECRAFT
PART NO.
TMP Cables
3
E100282
Battery BT1 (CR2032)
1
E850058
Loudspeaker Grill Cloth
1
E850089
#4 Fiber Washer
4
E700031
Bottom Feet with tilt stand
1
E980098
SO239 Hole Cover
1
E980135
BNC Hole Cover
2
E980136
Thumbscrew, #6
1
E700070
2D Fastener
10
E100078
Standoff, 4-40, 1/4” (6.4 mm) long
6
E700026
Standoff, 4-40, 3/8” (9.5 mm) long
2
E700153
Standoff, 4-40, 1/2” (13 mm) long
3
E700061
ILLUSTRATION
Front Feet with Stand
DESCRIPTION
Rear Feet
Typical Standoffs
(May be round or hexagonal)
A-10
DESCRIPTION
QTY
ELECRAFT
PART NO.
Screw, 4-40, 3/16” (4.8 mm) Black, Flat
Head
26
E700025
Screw, 4-40, 3/8” (9.5 mm) Black, Flat
Head
6
E700131
Screw, 4-40, 1/2” (13 mm) Black, Flat
Head
1
E700132
Screw, 4-40, 3/16” (4.8 mm), Black, Pan
Head
44
E700015
Screw, 4-40, 1/4” (6.4 mm) Zinc, Pan
Head
20
E700005
Screw, 4-40, 1/4” (6.4 mm) Black, Pan
Head
3
E700009
Screw, 4-40, 7/16” (11 mm) Zinc, Pan
Head
7
E700032
Lock Washer #4, Split
37
E700004
Lock Washer, #4, Inside Tooth
24
E700010
Nut, 4-40
22
E700011
Washer, Flat, #6
2
E700067
Grommet Bumper, 7/16” Round (Side
panel feet)
4
E980141
Allen Wrench, 5/64” (in envelope)
1
E980004
Allen Wrench, .050” (in envelope
1
E980008
ILLUSTRATION
Typical Pan Head Screws
Zinc
Black
A-11
E850241 Front Panel Hardware Bag
QTY
ELECRAFT
PART NO.
Felt Washer
2
E700033
Knurled Nut (Phones Jack)
1
E700138
Standoff, 2/56, 5/16” (7.9 mm) long
2
E700122
Standoff, 4-40, 5/16” (7.9 mm) long
2
E700121
Standoff, 4-40, 5/8” (15.9 mm) long
3
E700003
Screw, 4-40, 3/16” (4.8 mm) Black, Flat
Head
2
E700025
Screw, 2-56, 5/32” (4.0 mm) Black, Pan
head
4
E700149
Screw, 2-56, 1/4” (6.4 mm) Black, Pan
Head
4
E700124
Screw, 4-40, 1/4” (6.4 mm) Zinc, Pan
Head
6
E700005
Lock Washer, #2, Split
2
E700123
Lock Washer #4 Split
8
E700004
Nut, 1/2” (13 mm) Hex
6
E700125
Lock Washer, 1/2” (13 mm) Inside
Tooth
5
E700150
Washer, Flat, Phones Jack Spacer
1
E700145
Front Panel Light Blocker (2 strips in
envelope)
1
E850324
ILLUSTRATION
Typical Standoffs
DESCRIPTION
(Soft Foam Strips)
A-12
E850308 K3 Knobs for Front Panel
QTY
ELECRAFT
PART NO.
Knob, VFO B Tuning
1
E980090
Knob, RIT/XIT
1
E980089
Knob, Concentric Shaft, Large
2
E980092
Knob, Concentric Shaft, Small
2
E980091
Knob, Small Encoder Shaft
4
E980088
QTY
ELECRAFT
PART NO.
Knob, VFO A Tuning
1
E980093
Finger Grip, Main VFO Tuning Knob
1
E980094
ILLUSTRATION
DESCRIPTION
E850306 K3 Knobs and Band for VFO A
ILLUSTRATION
DESCRIPTION
A-13
E850316 Carrying Handle Bag
DESCRIPTION
QTY
ELECRAFT
PART NO.
Handle (strap, spring insert and two end
caps)
1
E850316
Screw, 6-32, 1/2” (13 mm), Black, Pan
Head (in envelope)
2
E700042
Lock Washer, #6, Split (in envelope)
2
E700041
Nut, 6-32 (in envelope)
2
E700069
ILLUSTRATION
E850301 Power Cable Kit
Bag with components and instructions sheet.
A-14

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