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4 WARRANTY AND SPECIFICATIONS
R.L. DRAKE COMPANY warrants to the original purchaser this product shall be free from defects in material or workmanship for three
(3) years from the date of original purchase.
During the warranty period the R.L. DRAKE COMPANY or an authorized Drake service facility will provide, free of charge, both parts and labor necessary to correct defects in material and workmanship. At its option, R.L. DRAKE COMPANY may replace a defective unit.
To obtain such warranty service, the original purchaser must:
(1) Retain invoice or original proof of purchase to establish the start of the warranty period.
(2) defect, of:
(a) the model and serial number,
(b) the identity of the seller and the approximate date of purchase; and
(c) A detailed description of the problem, including details on the electrical connection to associated equipment and the list of such equipment.
(3) container or equivalent, fully insured and shipping charges prepaid.
Correct maintenance, repair, and use are necessary to obtain proper performance from this product. Therefore carefully read the
Instruction Manual. This warranty does not apply to any defect that R.L. DRAKE COMPANY determines is due to:
(1) specifications of the original parts.
All implied warranties, if any, including warranties of merchantability and fitness for a particular purpose, terminate three (3) years from the date of the original purchase.
The foregoing constitutes R.L. DRAKE COMPANY’S entire obligation with respect to this product, and the original purchaser shall have no other remedy and no claim for incidental or consequential damages, losses or expenses. Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation and exclusion may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This warranty shall be construed under the laws of Ohio.
SPECIFICATIONS
RF
Input Frequency:
Input Level:
Noise Figure:
Image Rejection:
Input Impedance:
54 - 806 MHz,
Off air channels
2 - 69,
CATV channels
2 - 125.
-10 to +35 dBmV.
VHF: 8 dB.
UHF: 10 dB.
VHF: 65 dB.
UHF: 50 dB.
75 Ohms.
VIDEO
Output Level:
Output Impedance:
Differential Gain:
Differential Phase:
L/C Delay:
1.0 Vp-p, NTSC standard negative sync.
75 Ohms.
Less than 5%.
Less than 5 degrees.
±50 nSec maximum.
AUDIO
Output Level:
Output Impedance:
300 mV rms nominal, adjustable with front panel control ±10 dB.
Less than 500 Ohms, unbalanced.
GENERAL
DC Power Input: +12 VDC @ 120 mA,
+5 VDC @ 100 mA.
Operating
Temperature:
Dimensions:
Weight:
0 0 C to +50 0 C.
1” W x 3.5” H x 7.5” D.
12 oz.
®
DMM 806 VIDEO DEMODULATOR SYSTEM 1
RMM12 RACK MOUNT
DRAKE MINI-RACK
POWER SUPPLY
#
CH
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
VMM 600
AUDIO
VIDEO
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
#
CH
AUDIO
VIDEO
PWR
A / V
RF
#
CH
VMM 600
AUDIO
VMM 600
VIDEO
AUDIO
VIDEO
DMM 806
PWR
PWR
PWR
A / V
CH
A / V
RF
#
CH
4 0
RF
OFF AIR
CATV
CATV
+ 100
AUDIO
PSM 120 POWER SUPPLY
POWER 1
POWER 2
RMM4 RACK
MOUNT
OR
DRAKE MINI-RACK
SINGLE CHANNEL MODULATOR
POWER SUPPLY
DMM 806
DEMODULATOR
The R.L. Drake DMM 806 is a professional quality agile television channel demodulator that provides an audio and video output from any VHF, UHF, or CATV channel
(54 - 806 MHz). The modular design of the
DMM 806 permits convenient pairing with a
Drake Mini-rack Video Modulator to perform off-air or CATV channel processing.
The desired off-air VHF or UHF television channel from 2 through 69 or CATV channel from 2 through 125 is selected by a front panel pushwheel switch and associated slide switch. The DMM 806 provides a standard negative sync video output at a nominal level of 1 Vp-p, and an audio output signal that is level adjustable from approximately 0.5 to
1.5 Vp-p with a front panel control.
As previously described, channel selection switches and audio output level control are located on the front panel. The RF Input is through an “F” type connector located on the rear panel. The rear panel Video Output is also an “F” type connector. The Audio Output is through a rear panel RCA type phono connector. The unit is powered by a compatible Drake Mini-rack power supply module.
® is a registered trademark of the R.L. Drake Company
© Copyright 2001 R.L. Drake Company P/N: 3852324E-9-2001 Printed in U.S.A.
2 FRONT PANEL DESCRIPTION REAR PANEL DESCRIPTION
R1
VIDEO OUT
F1
F2
F3
DMM 806
PWR
CH
4 0
OFF AIR
CATV
+
100
CATV
R2
R3
AUDIO OUT
+5V
+12V
GND
DC INPUT
RF IN
R4
F4 AUDIO
Figure 1 Figure 2
F1 - POWER Indicator
Lights when the unit is connected to the required source of DC power via the rear panel DC INPUT connector.
R1 - VIDEO OUTPUT Connector
This is the 75 Ohm baseband video output at a fixed, nominal 1.0 Vp-p level.
F2- Channel Number Switch
Sets the received channel number for off-air
TV channels 02 through 69 or for CATV channels 02 through 125. See also Item F3 which sets the type of channel (Off-Air or
CATV) and sets the leading “1” for CATV channels 100 through 125.
R2 - AUDIO OUTPUT Connector
This is the unbalanced, audio output which is adjustable with the front panel AUDIO control over a range of approximately ± 10 dB from the nominal output level of 300 mV rms.
NOTE: An internal jumper defeats the audio de-emphasis for stereo capability, if required.
F3 - Mode Switch
Sets the type of channel, Off-Air or CATV.
The third position sets a leading “1” for
CATV channels from 100 through 125. See also Item F2 for setting the channel number.
R3 - DC INPUT Connector
This 3-pin connector (Male) accepts the appropriate mating DC power cable.
Observe proper orientation and wiring.
For example:
Setting for CATV channel "25"-
For example:
Setting for CATV channel "125"-
R4 - RF INPUT Connector
This is the 75 Ohm input to the demodulator circuits from an off-air television receiving antenna or from a CATV cable input.
CH CH
2 5 2 5
OFF AIR
CATV
OFF AIR
+ 100
CATV
CATV
+ 100
CATV
F4 - AUDIO Output Level Control
This screwdriver adjustment permits setting the audio output level over a range of approximately 0.5 to 1.5 Vp-p.
Audio - Flat
Audio De-emphasis
(factory setting)
INTERNAL
JUMPER
Front
Panel
INSTALLATION 3
CONNECTIONS and CONTROLS
All connections to and from the DMM 806 are made through the rear panel. Figure 3 illustrates the use of the DMM 806 as an offair channel processor. For this purpose, the feed from a television antenna is connected via a 75 Ohm coaxial cable to the RF IN connector of the DMM 806. The front panel switches are set for “OFF-AIR” and the received TV channel number is set for 02 through 69 as required. The VIDEO OUT and AUDIO OUT signals are connected to the VIDEO IN and AUDIO IN connectors respectively of an adjacently located Video
Modulator, such as a Drake Mini-rack Video
Modulator, operating on the desired cable TV
AC POWER
CORD
TV ANTENNA
OR
CATV FEED channel. Alternatively, cable TV channels can be processed by connecting the 75 Ohm coaxial cable of a CATV feed to the DMM 806
RF IN connector and setting the front panel switches for “CATV” or “CATV +100” and the received cable channel number 02 through
125 as required. Additional channels can be processed by adding combinations of
DMM 806 units with Drake Mini-rack Video
Modulator units.
RACK MOUNTING
Adequate ventilation is very important in multi-channel installations. Units should be spaced apart by at least one panel height wherever possible, and some air movement is advisable in enclosed rack cabinets.
Excessive heat will shorten component life and system performance will be degraded without proper cooling.
DMM 806
DRAKE MINI-RACK
VIDEO MODULATOR
DC POWER CABLE
RF COMBINER
SYSTEM OUT
Figure 3
Illustration of Channel Processing using DMM 806 and a Drake Mini-rack Video Modulator.
®
R.L. DRAKE COMPANY
230 INDUSTRIAL DRIVE
FRANKLIN, OHIO 45005 U.S.A.
CUSTOMER SERVICE AND PARTS TELEPHONE:
+1 (937) 746-6990
TELEFAX:
+1 (937) 743-4576
WORLD WIDE WEB SITE: http://www.rldrake.com

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