VMM860AG Quick Reference Sheet
651242300A
Part No.
1002469A
VIDEO
IN
RF
OUT
P
O
W
E
R
10
13
12
11
STEREO
RIGHT
LEFT
MONO
14
AUDIO IN
1. Audio/Video Ratio Adjustment
- Adjustment of the A/V Ratio is permitted from
approximately -19 dB (full clockwise position) to approximately -10 dB
(full counter clockwise position) by rotating the potentiometer.
2. Video Adjustment
- Adjustment of the Video Modulation Level is permitted
by rotating the potentiometer.
3. Video Over Modulation LED Indicator
4. Audio Adjustment
- Adjustment of the Audio Modulation Level is permitted
by rotating the potentiometer.
5. Audio Over Modulation LED Indicator
6. Up/Down Buttons
- Used to set the desired channel or mode.
7. +100 Indicator -
Lights when channel settings are 100 -135.
8. Channel ENT Button
- Enter button used to enter a desired channel or mode.
9. RF Level Adjustment
- Potentiometer adjustment used to set the output
level. Has a range of 15 dB, optimum performance with a 10 dB adjustment.
Operating Controls and Indicators
Programming the Unit
The VMM860AG unit comes factory set to operate in the Standard CATV mode.
The unit has 4 valid operating modes: STD CATV, IRC, HRC & Broadcast UHF/VHF. (Skip to
the next section for programming the operating mode)
Programming a Channel
1. Navigate to the desired channel number by depressing the CH
p
UP and
q
DN
buttons.
a. Continuous past 99 for channels 100-135, the +100 red LED will illuminate.
2. Press the ENT button when you reach the desired channel setting. This will tune the
modulator output to the corresponding channel frequency for this entry.
a. The LED display will blink continuously during the channel programming pro-
cess and will not change the output frequency the unit is programmed until the
ENT button is depressed.
b. The unit has a special feature that alerts an operator of an inadvertent or
desired change to the channel display by flashing the LED readout. The LED display
will continue to flash for 30 seconds if the ENT button is not depressed and then
will return to the display of the previously programming channel entry setting.
Operating Mode Selection
The unit has 4 valid operating modes: STD CATV, IRC, HRC & Broadcast UHF/VHF.
The
VMM860AG
unit comes factory set to operate in the Standard CATV mode.
To change the operating mode:
1. Simultaneously depress the CH
p
UP and
q
DN buttons for approximately
5 seconds.
2. The Channel LED display will switch to the operating mode selection.
3. Use the CH
p
UP and
q
DN buttons to select the desired mode:
a. C = STD CATV
b. H = HRC
c. I = IRC
d. U = Broadcast (VHF/UHF)
4. After selecting the desired mode depress the ENT button to set the mode.
5. The unit will return to the channel display mode.
a. Programming will reflect the mode chosen – See next page for a detailed fre-
quency plan.
b. The programming mode will also flash continuously during the program-
ming process. The LED display will continue to flash for 30 seconds if the ENT
button is not depressed and then will return to the display of the previously
programming channel & mode entry setting.
10. Video Input
“F” Connector
1VP-P for 87.5%
depth of mod
11. Right Stereo Audio In
Not used on this model
12. Left Stereo Audio or Mono In
RCA Connector
0.5 - 4.0 VP-P
(Constant AGC Range)
13. Power Connector
14. RF Output
“F” Connector
See the reverse of this sheet for a complete list of available channels and corresponding frequency plan
It is strongly recommended to use the Drake PSM125 power supply with the VMM860AG. It is also recommended to use a headend fan unit
when deploying more than 6 VMM860AG units in the RMM12 chassis. A rack space above and below the chassis unit is suggested for heat
dissipation and air flow.
CAUTION
Rear Panel
Front Panel
VMM
A/V
RF
Level
ENT
860AG
AUD
6
9
+100
UP
DN
CH
VID
1
8
7
4
2
3
5
©2016 R.L. Drake All rights reserved. Specifications are subject to change without notice. Trademarks are the property of their respective owner.
Troubleshooting
Correction Suggestions
The User should perform the following steps to correct an Error Condition:
1. Check that the Channel Display is set to the desired channel & reset as appropriate
2. Check that the unit is set to the appropriate desired operating mode
3. Verify the unit output on a spectrum analyzer
4. Disconnect & reconnect power to the unit
If an error condition continues to be displayed, unit should be replaced and serviced
A continuous flashing Channel Display indicates an Error Condition detected by the unit
microcontroller. Sample conditions include:
• Channel Selector Entry does not match the channel number on which the modulator is
operating, the display will flash for 30 seconds and then revert back to the previous CH entry
• E1 is displayed if the Input & VCO is Not Locked
• E2 is displayed if the Output VCO is Not Locked
• E3 is displayed if both VCO's are Not Locked
