DRAKE VMM 600 User manual

THREE YEAR LIMITED WARRANTY
SPECIFICATIONS
Specifications subject to change without notice or obligation.
54-600 MHz.
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
AUDIO
GENERAL
DC Power Input:
Operating Temperature:
Size:
Weight:
+12 VDC @ 240 mA,
+5 VDC @ 35 mA,
0°C to +50°C.
1"W x 3.5" H x 7.78"D.
11 oz.
RF
Frequen cy Range:
VMM600-
VMM806-
VIDEO
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.
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 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.
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
The VMM 806 provides a modulated visual and
RF carrier output on any single channel
12 POSITION RACK MOUNT POWER SUPPLY
®
VMM 600/VMM 806 VIDEO MODULATOR SYSTEM 1
® is a registered trademark of the R.L. Drake Holdings LLC
© Copyright 2012 R.L. Drake Holdings LLC P/N: 651232000A
10072XX/10073XX
Rev:120917
4 POSITION
RACK MOUNT
POWER SUPPLY
OR
VMM 600/VMM 806 MODULAR
SINGLE-CHANNEL MODULATORS
rules.
87-125.
4 WARRANTY AND SPECIFICATIONS
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 Range: 50 Hz to 12 kHz
Frequency Response: ± 0.5 dB
Total Harmonic Distortion: 1% @ 25 kHz deviation
Signal-to-Noise Ratio: 70 dB
The modulators have Audio AGC that eliminates
variations in loudness level that may be present
among various program sources.
Printed in China

®
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.
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.
VMM 600's/VMM 806's
AUDIO INPUTS
VIDEO INPUTS
AC POWER
CORD
DC POWER
CABLE
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.
R2 - AUDIO INPUT Connector
This “RCA” (phono) connector input accepts
baseband audio at a nominal level of 0.5 VPP.
NOTE: two internal jumpers can be configured
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.
R4 - RF OUTPUT Connector
This is the modulator RF output
INSTALLATION 3
2 FRONT PANEL DESCRIPTION REAR PANEL DESCRIPTION
R.L. Drake Holdings LLC
9900 Springboro Pike
Miamisburg, Ohio 45342
Customer Service and Parts Telephone: [phone]
Fax:[phone] www.rldrake.com
Figure 3
SYSTEM OUT
RF COMBINER
F1 - AUDIO Level Control
This screwdriver adjustment varies the peak
aural carrier deviation. Clockwise rotation
increases the carrier deviation.
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.
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.
F5 - "CH#" (Channel)
The modulator is factory aligned to the
channel number indicated.
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.
F1
F2
F3
F4
F5
F6
2
Figure 1 Figure 2
Internal Jumper Settings
R1
R4
R3
R2
J3
J4
STEREO MONO
DISABLE ENABLE
PRE-EMPHASIS