TH-3JRS

Tri-band HF 3 Elements Beam

Covers 10, 15 and 20 Meters

300 Industrial Park Road, Starkville, MS 39759

Ph: (662) 323-8538 FAX: (662) 323-6551

INSTRUCTION MANUAL

WARNING

Installation of this product near power lines is dangerous. For your safety, follow the installation directions.

General Description

The TH3JR-S antenna was designed for the Ham who has space limitations but still wants top performance on 10, 15 and 20 meters.

The TH3JR-S is constructed of taper-swaged aluminum tubing which offers low wind resistance. It can be rotated with a heavy-duty TV rotator. The light weight is ideal for rooftop or lightweight tower installations. The antenna features super strength stainless steel hardware and a boom-to-mast bracket that will fit masts up to 2 inches in diameter.

Specifications

Electrical

Forward Gain

Front-To-Back Ratio

VSWR at Resonance

Nominal Impedance

Power Capability (Transmitter Output)

Lightning Protection

Up to 8 dBi

25 dB

Less than 1.5:1

50 ohms

600 Watt PEP, 300 Watt AM

DC ground

Mechanical

Net Weight

Boom Length

Longest Element

Turning Radius

Wind Survival

Accepts Mast

Surface Area

Effective Moment*

21 lbs. (11.7 kg)

12 ft. (3.65 m)

27’3” (8.30m)

14’9” (4.49m)

80 mph (128 kmph)

1 ¼” to 2” (32 mm to 51mm)

3.35 sq. ft. (0.32 sq. m)

310 ft. lb. (53 kg-m)

Wind Load at 80 MPH

Hardware

Suitable Rotators

87 lbs. (39.4 kg)

Stainless Steel (except for U-Bolts and some small parts)

Hy-Gain AR-40 or CD-45II

*Effective Moment is defined as the product of the antenna weight and turning radius.

Step-By-Step Assembly

NOTE: When unpacking your antenna, check the inside of all tubing for parts (clamps, insulators, smaller tubing, etc.). To conserve space during packing, these smaller articles are put inside large pieces.

Select the two boom sections (1 1/4" x 72") and boom-to-mast brackets.

NOTE: The reflector portion of the boom has holes drilled in it for the beta match. Make sure they are on top when you tighten the boom-tomast bracket. See illustration in this manual.

Assemble the two halves of the boom-to-mast bracket by placing the 1/4" x 3/4" screws in the four outside holes as shown in Figure 1. DO

NOT tighten at this time.

Slip the boom sections into the boom-to-mast bracket until they meet in the middle. Make certain the drilled holes on the reflector end are on top and close to the boom-to-mast bracket, then tighten the bolts securely.

Place a 11/4" caplug on each end of the

Insert the two U-bolts into the boom-to-mast bracket and start the 5/16" nuts and lockwashers. DO NOT tighten at this time.

the dimensions from Figure 4.

Figure 2

Reflector/Director Detail

Start at the reflector end (boom section that has the hole drilled in it) and measure approximately

1" from the end of the boom and install the elementboom bracket as shown in Figure 2. Only tighten the hardware enough to keep the bracket in place. Final positioning of this element will depend upon placement of the driven element and

Select the Rl sections (7/8" x 72") of tubing and slip one end of each in each side of the bracket and tighten the bracket securely with the exception of the two anchor screws. DO NOT

tighten at this time

Slip the insulated end of the DE1 section into the driven element bracket and tighten securely. See

Figure 3 for proper installation. DO NOT tighten

the anchor screws at this time.

Measure 74" from the center of the driven element bracket to the center of the director and install the director element-to-boom bracket. Select and install the D1 sections (7/8" x 72") by slipping one into each side of the bracket and tighten securely.

DO NOT tighten the anchor screws at this time.

Now recheck the measurement and make certain all the elements are aligned evenly.

Measure along the boom 65 1/8" from the center of the reflector element-to-boom bracket and install the driven element-to-boom bracket. Select the DE sections and slip the driven element insulators onto one end of the DE1 sections (7/8" x

72").

Figure 3

Driven Element Bracket Assembly

NOTE: At this time select your mode of transmission - either Phone or Continuous Wave (CW).

Refer to the dimensions for your mode of transmission. Use the same mode for all dimensions.

Select the 10-meter reflector trap (marked REF) and a #6 tubing clamp and slip it on the end of Rl.

Slip the longest end of the 10-meter trap into the

Rl section to the dimensions given for your mode of transmission. Tighten the tubing clamp slightly.

See Figure 4.

Select R2 (3/4" x 10 1/2") and slip it onto the 10meter trap assembly. Slip one #6 tubing clamp on each end of R2. Tighten slightly.

VSWR Charts

These VSWR curves are typical for this antenna mounted 70 feet above ground, horizontally polarized. Similar curves can be expected for this antenna mounted at least 30 feet above ground. DO NOT try to tune this antenna for low VSWR at ground level.

Figure 5

VSWR Charts

Installation of Tubing Clamp

Select the proper size tubing clamp as shown in the chart. (See Figure 6). When installing the clamps, place the clamp near the tube end with the top of the clamp over the slot in the tube as shown in Figure 6.

After adjustment of the tubing lengths, tighten the clamp with a 5/16 inch nut driver, socket, or open end wrench until the tubing will not twist or telescope.

Part

No.

358756

Description

Clamp, Size #6 all stainless steel

5/16" hex head screw

Fits

Tubing

Sizes

½” and ¾”

Figure 6

Tubing Clamps

Select the R3 sections (7/16" x 32") and slip it into the 15-meter trap assembly to the dimensions shown for your mode of transmission. Slip on #6 tubing clamp, and

Select the remaining DE tube sections and install as before.

tighten slightly.

Select the remaining director tube sections and install as before.

Place a 7/16" caplug on each end of the

Select the beta match support insulators as shown in Figure 7.

element.

NOTE: The remaining elements will be installed in the same manner as above with the exception of using the trap designated for that particular element. The traps are marked as follows:

10-Meter Traps

Director - 10 DIR

Driven Element - 10 DE

Reflector - 10 REF

Select the beta shorting strap and install as shown in Figure 7. Tighten all hardware used with the beta match, shorting strap and driven element. Remeasure the dimensions between elements as shown in Figure 4. Tighten all hardware including the anchor screws at this time.

15-Meter Traps

Director - 15 DIR/REF

Driven Element - 15 DE

Reflector - 15 DIR/REF

A balun is not required for normal operation of this antenna. However, there are three recommended feedpoint configurations, one of which utilizes the Hy-Gain Model BN-86 balun for increased performance and convenience.

Figure 7

Beta Match/Feedline Attachment

Figure 8

RF Choke

The first feedline configuration involves connection of the coaxial feedline directly to the driven element. The recommended feedline is RG-213/U

(such as Belden 8267). Other types of coaxial cable may be used if proper selection and careful assembly are utilized. The feedline should be stripped as shown in Figure 7. Attach solder lugs

(not supplied) to the center conductor and shield for easy connection to the driven element.

Weatherproof all connections.

The second feedpoint configuration involves construction and installation of a homemade RF choke. The RF choke will prevent RF from flowing on the outside of the coaxial shield. This will block radiation from the coaxial feedline; thereby reducing the risk of TV1 and preventing radiation pattern degradation.

Wind the RF choke from RG-213/U ( or equivalent) coaxial cable. The choke should consist of 12 turns with an inside coil diameter of six inches. Allow enough cable at the end to reach from the mast to the driven element. Strip the coaxial cable as shown in Figure 7. Attach solder lugs (not supplied) to the center conductor and shield for easy connections to the driven element.

Weatherproof all connections.

The third feedpoint configuration involves using a 50 ohm 1:1 balun to connect the feedline to the driven element. (Hy-Gain Model BN-86 is recommended.) A balun will act as an RF choke and will balance the flow of current on the driven element, resulting in a symmetrical radiation pattern. A balun will also have a coaxial connector, providing more convenience than a coax splice.

Follow the instructions supplied with the balun for connection to the antenna.

NOTE: Use caution when selecting a balun to use with this antenna. Some baluns are designed for

50-75 ohm impedance and may result in a higher

SWR when used with this antenna. For best results, use the Hy-Gain BN-86, 50 ohm balun.

The Model BN-86 is available at your local Hy-

Gain dealer.

Carefully recheck all measurements, make certain the drain holes in the traps are facing down and then tighten all compression clamps securely.

Make certain all electrical connections are tight.

Weatherproof your coaxial connection using

Coax-Seal (R) or some similar substance.

Slip the boom-to-mast clamp over your mast and tighten securely.

This completes your installation.

WARNING

Installation of this product near power lined is dangerous. For your safety, follow the installation directions.

PARTS LIST

33

34

35

36

37

38

39

25

26

27

28

21

22

23

24

29

30

31

32

40

41

42

43

14

15

16

17

18

19

10

11

12

13

8

9

6

7

Item

No.

1

4

5

2

3

Part No.

Description Qty

190500 DE2, 3/4" x 9 1/2" ..........….........................................................................2

176211

174992

190202

871732

Boom (Reflector), drilled, 1 1/4" x 72" .....................................................1

Boom (Director), 1 ¼” x 72”…..................................................................1

Tube, swaged, 7/8" x 72"........................................................................... 6

10-Meter Trap Assembly (Director) ........................................................2

871733

871819

871734

871820

10-Meter Trap Assembly (Reflector)....................................................... 2

10-Meter Trap Assembly (Driven Element) ........................................... 2

15-Meter Trap Assembly (Director & Reflector) .................................. 4

15-Meter Trap Assembly (Driven Element) ........................................... 2

190501

176212

176214

176216

R2, 3/4" x 10 1/2" ...................................................................................... 2

DE3, 7/16" x 34 1/2"...................................................................................2

D3, 7/16" x 311/2 ".....................................................................................2

R3, 7/16" x 32" .......................................................................................... 2

190502

165138

D2, 3/4" x 5 7/8" .......... ..............................................................................2

Element-to-Boom Bracket (DE) ..............................................................2

165141 Element-to-Boom Bracket (D & R) ........................................................4

385142-1 Boom-to-Mast Bracket...............................................................................1

385144-1 Boom-to-Bracket Clamp............................................................................ l

176232

878685

Beta Match................................................................................................... l

Parts Pack 221S-1, stainless steel .............................................................. l

169339 Tubing Clamp, 7/8"..................................................................................2

173370 Beta Shorting Clamp ..............................................................................1

358756 Clamp, #6 Tubing.................................................................................24

(Not Used)

455630 Caplug, 1 ¼” …..…………….......................................................... 2

455644 Caplug, 7/16"............................................................................................6

463642

463767

Insulator, Beta Match.............................................................................2

Insulator, Driven Element.....................................................................2

520034 Screw, Type T, #6-32 x 11T, rh ............................................................. 3

500160 Bolt, hex head, #10-24 x 5/8".............................:...................................1

504069

554071

Bolt, hex head, #10-24 x 1"....................................................................2

Nut, hex, #10-24......................................................................................5

565697

(Not Used)

Lockwasher, internal, #10...................................................................31

500156 Bolt, hex head, 1/4"-20 x 3/8" ................................................................. 6

505266 Bolt, hex head, 1/4"-20 x 3/4" ...............................................................28

(Not Used)

554099 Nut, hex, 1/4"-20 ....................................................................................28

551367 Nut, square, 1/4"-20.................................................................................6

562961 Lockwasher, internal, l/4"....................................................................30

540067 U-bolt, 5/16"-18 x 3 5/8"..........................................................................2

564792 Lockwasher, split, 5/16".................................:........................................4

555747 Nut, hex, 5/16"-18 ....................................................................................4

LIMITED WARRANTY

Hy-Gain Warrants to the original owner of this product, if manufactured by Hy-Gain and purchased from an authorized dealer or directly from Hy-Gain to be free from defects in material and workmanship for a period of 12 months for rotator products and

24 months for antenna products from date of purchase provided the following terms of this warranty are satisfied.

1. The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit card or money order receipt, etc.) describing the product to establish the validity of the warranty claim and submit the original or machine reproduction of such proof of-purchase to Hy-Gain at the time of warranty service. Hy-Gain shall have the discretion to deny warranty without dated proof-of-purchase. Any evidence of alteration, erasure, or forgery shall be cause to void any and all warranty terms immediately.

2.

Hy-Gain

agrees to repair or replace at Hy-Gain’s option without charge to the original owner any defective product under warranty, provided the product is returned postage prepaid to Hy-Gain with a personal check, cashiers check, or money order for $8.00 covering postage and handling.

3. Under no circumstances is Hy-Gain liable for consequential damages to person or property by the use of any Hy-Gain products.

4. Out-of-warranty Service: Hy-Gain will repair any out-of-warranty product provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner. Repair charges will be added to the COD fee unless other arrangements are made.

5. This warranty is given in lieu of any other warranty expressed or implied.

6.

Hy-Gain

reserves the right to make changes or improvements in design or manufacture without incurring any obligation to install such changes upon any of the products previously manufactured.

7. All Hy-Gain products to be serviced in-warranty or out-of-warranty should be addressed to

hy-gain, 308 Industrial Park Road,

Mississippi 39759, USA

and must be accompanied by a letter describing the problem in detail along with a copy of your dated proof-of-purchase.

8. This warranty gives you specific rights, and you may also have other rights which vary from state to state.