DRAKE VMM 806 Quick Manual
DRAKE VMM 600 is a professional-grade modular headend system designed to optimize rack space and provide high-quality video and audio modulation. It features up to 12 VMM 600 and/or VMM 806 modulators, a single power supply, and a 12-position rack mount. Each modulator accepts standard audio/video sources, including NTSC video and audio baseband signals, and provides a modulated visual and RF carrier output on a single channel.
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4 WARRANTY AND SPECIFICATIONS
THREE YEAR LIMITED WARRANTY
R.L. DRAKE HOLDINGS LLC 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 R.L. DRAKE HOLDINGS LLC 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 HOLDINGS LLC may replace a defective unit.
To obtain such a warranty service, the original purchaser must:
1. Retain invoice or original proof of purchase to establish the start of the warranty period.
2. Notify R.L. DRAKE HOLDINGS LLC or the nearest authorized service facility, as soon as possible after discovery of a possible 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. Deliver the product to R.L. DRAKE HOLDINGS LLC or the nearest authorized service facility, or ship the same
in its original container or equivalent, fully insured and shipping charges prepaid.
Correct maintenance, repair, and use are important 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 HOLDINGS LLC determines is due to:
1. Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications of the original parts.
2. Misuse, abuse, neglect or improper installation.
3. Accidental or intentional damage.
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 HOLDINGS LLC'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
Frequency Range:
VMM600-
VMM806-
Factory set to one of the following channels:
Cable Channels 2-86, 95-99
600-806 MHz.
Factory set to one of the following channels:
Cable Channels 87-125
Impedance: 75 Ohms
Return Loss: 15 dB
Power Level: +45 dBmV
Power Level Range: 10 dB continiously adjustable
Carrier-to-Noise: 63 dB
Broadband Noise: -90 dBc
Spurious Outputs: -66 dBc
Aural/Visual Carrier Ratio: -11 to - 19 dB
4.5 MHz Aural Inter-carrier
Freq. Tolerance: ± 250 Hz; 32 to 122 °F
Connector: “F” Female
Impedance: 75 Ohms
Return Loss: 20 dB
Input Level: 1.0 volt Peak to Peak
Frequency Response: 1.0 dB Peak to Valley
Peak to Peak Video-to-RMS
Hum Ratio: 64 dB
Signal-to-Noise Ratio: 65 dB
Differential Gain: 2.0%
Differential Phase: 2.0 degree
C/L Delay: Per FCC Requirements
Connector: RCA
Input Impedance: Greater than 10k Ohms,
unbalanced
Input Level: 0.5 to 4.0 volt peak-to-peak
(constant AGC range)
Frequency Response: ± 0.5 dB
Total Harmonic Distortion: 1% @ 25 kHz deviation
Signal-to-Noise Ratio: 70 dB
GENERAL
DC Power Input:
Operating Temperature:
Size:
Weight:
+12 VDC @
0°C to +50°C.
11 oz.
mA,
1"W x 3.5" H x 7.78"D.
Specifications subject to change without notice or obligation.
®
VMM 600/VMM 806 VIDEO MODULATOR SYSTEM 1
12 POSITION RACK MOUNT POWER SUPPLY
4 POSITION
RACK MOUNT
OR VMM 600/VMM 806 MODULAR
SINGLE-CHANNEL MODULATORS
POWER SUPPLY
The R.L. Drake VMM 600/VMM 806 Video
Modulator System is a professional quality modular headend system designed to optimize rack space. Up to 12 VMM 600 and/or
VMM 806 modulators can be racked alongside a single power supply in the Drake 12 position rack mount or up to 4 modulators can be racked in the 4 position rack mount. Either model is a high quality, fixed channel heterodyne audio/ video modulator.
The VMM 600 provides a modulated visual and
RF carrier output on any single channel 2-86,
95-99; Aeronautical channels are offset positive with a tolerance of ±5 kHz as required by FCC rules.
The VMM 806 provides a modulated visual and
RF carrier output on any single channel
87-125.
The heterodyne conversion system, in conjunction with the use of a SAW filter, insures optimum vestigial selectivity for adjacent channels.
The modulators are designed to accept any standard audio/video source such as NTSC video and audio baseband signals from a satellite receiver, TV camera, videotape recorder, TV demodulator, or similar signal source.
The modulators have Audio AGC that eliminates variations in loudness level that may be present among various program sources.
The modulators accept standard (sync negative) polarity video at a 0.7 to 2.5 Vp-p level. All level controls are located on the front panel for ease of operation. Output level of
+45 dBmV is typical and is adjustable from
+30 to +45 dBmV.
Field-defeatable audio pre-emphasis enables passing of BTSC encoded standard baseband stereo audio signals.
® is a registered trademark of the R.L. Drake Holdings LLC
© Copyright 2012 R.L. Drake Holdings LLC
Printed in China 10072XX/10073XX
Rev:120917
2 FRONT PANEL DESCRIPTION REAR PANEL DESCRIPTION
2
F1
R1
F2 R2
R3
F3
F4
F5
F6
R4
Figure 1 Figure 2
F1 - AUDIO Level Control
This screwdriver adjustment varies the peak aural carrier deviation. Clockwise rotation
increases the carrier deviation.
R1 - VIDEO INPUT Connector
This input accepts baseband input thru
4.2 MHz video at levels from 0.7 Vp-p to
1.5 Vp-p.
F2 - VIDEO Level Control
This screwdriver adjustment varies the video
modulation level. Clockwise rotation
increases the modulation depth.
F3 - POWER Indicator
Lights when the unit is connected to the required source of DC power via the rear panel
DC INPUT connector.
R2 - AUDIO INPUT Connector
This “RCA” (phono) connector input accepts baseband audio at a nominal level of 0.5 VPP.
to defeat the audio pre-emphasis or stereo capability. Top cover must be opened to access.
R3 - DC INPUT Connector
This 3-pin connector (Male) accepts the appropriate mating DC power cable. Observe proper orientation and wiring.
F4 - A/V Ratio Control
This screwdriver adjustment varies the level of the aural carrier over a range from 11 to 19 dB below the visual carrier. The aural carrier should be adjusted to approximately 15 dB below the visual carrier (normal operation).
Clockwise rotation increases the aural carrier level and thus decreases the A/V ratio.
R4 - RF OUTPUT Connector
This is the modulator RF output
STEREO MONO
DISABLE ENABLE
F5 - "CH#" (Channel)
The modulator is factory aligned to the channel number indicated.
PRE-EMPHASIS
J4
J3
F6 - RF Output Level
This screwdriver adjustment varies the RF
Output level from approximately 35-45 dBmV.
The maximum output level is set with the adjustment fully clockwise.
Internal Jumper Settings
INSTALLATION 3
CONNECTIONS AND CONTROLS
All connections to and from each modulator are made through the rear panel. Figure 3 illustrates an installation with 12 modulator units combined through a passive signal combiner.
Additional channels can be added by using additional VMM 600 or VMM 806 modulators and either multi-port combiners or combinations of two-port combiners.
INSTALLATION NOTES
Level adjustment provides optimum performance in multi-channel installations. The modulator outputs should be checked periodically with a spectrum analyzer to maintain a ±1 dB variation of adjacent channel carriers.
AC POWER
CORD
AUDIO INPUTS
VIDEO INPUTS
Aural/Visual (A/V) ratios should be held to
-15 dB or less. The output ‘RF’ and ‘A/V
(Ratio)’ controls are used respectively to make these adjustments.
RACK MOUNTING
Adequate ventilation is very important in multi-channel installations. Units should be spaced apart by at least one panel height (1.75”) wherever possible, and some air movement is advisable in enclosed rack cabinets.
Excessive heat will shorten component life and modulator performance will be degraded without proper cooling.
VMM 600's/VMM 806's
DC POWER
CABLE
RF COMBINER
SYSTEM OUT
Figure 3
®
R.L. Drake Holdings LLC
9900 Springboro Pike
Miamisburg, Ohio 45342
Customer Service and Parts Telephone: +1 (937) 746-6990
Fax: +1 (937) 806-1510 www.rldrake.com

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