8 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: 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.
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) 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.
®
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
® is a registered trademark of the R.L. Drake Company
© Copyright 2003 R.L. Drake Company P/N: 3852416H-12-2003 Printed in U.S.A.
®
VMM806AG VIDEO MODULATOR 1
12 POSITION RACK MOUNT POWER SUPPLY
MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR
AUDIO AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
AUDIO
VIDEO
#
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
PWR
A / V
RF
PWR
POWER
ERROR
AUDIO
A / V
VIDEO
#
CH
2
RF
5
CATV
+100
CATV
BC
TV
A / V
RF
MODULATOR MODULATOR
AUDIO
VIDEO
AUDIO
VIDEO
#
CH
PWR
A / V
RF
#
CH
PWR
A / V
RF
4 POSITION
RACK MOUNT
OR VMM806AG and other compatible modular units
POWER SUPPLY
POWER SUPPLY
The R.L. Drake Video Modulator System is a professional quality modular headend system designed to optimize rack space. An assortment of up to (12) modular units, such as the fixed channel series of modulators, or agile modulators, or compatible audio/video products can be racked alongside a single power supply in the Drake12 position rack mount. The RMM4 rack mount accepts up to (4) modular units.
The R.L. Drake VMM806AG Audio-Video
Modulator is a high quality, vestigial sideband unit with synthesized visual and aural carriers.
The frequency agile VMM806AG allows front panel pushwheel switch selection of standard
CATV channels 2 through 125, or VHF/UHF TV channels 2 through 69. Aeronautical channels are offset positive with a tolerance of ±5 kHz as required by FCC rules.
The heterodyne conversion system, in conjunction with the use of a SAW filter, ensures optimum vestigial selectivity for adjacent channel headends.
An optional FCC predistortion SAW response is also available for the VMM806AG.
The modulator is 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 modulator is designed to accept standard
(negative sync) polarity video at 0.6 to 1.5 Vp-p level. All level controls are located on the front panel for ease of operation. Output level is
+45 dBmV and is adjustable over a 15 dB range.
Field-defeatable audio pre-emphasis allows transmission of BTSC encoded baseband stereo audio signals using the Drake stereo encoder. The AUDIO INPUT can also accept a
4.5 MHz audio modulated carrier by changing internal jumpers.
2 FRONT PANEL CONTROLS and INDICATORS
F5
F6
F7
F1
F2
F3
F4
VMM806AG
POWER
ERROR
AUDIO
VIDEO
2 5
CATV
+100
CATV
A / V
BC
TV
RF
F1 - POWER/ERROR Indicator
Lights when the unit is connected to the required source of DC power via the rear panel
DC INPUT connector. A flashing condition indicates an invalid channel setting or other conditions that would cause the unit to operate on an invalid channel. The RF output is switched off for flashing (ERROR) conditions.
Figure 1
F5 - Mode Switch
Sets the type of channel, CATV or Broadcast
TV (“BC TV”). The first position of the switch
(“+100”) sets a leading “1” for CATV channels
100 through 125. See also Item F4 for setting the channel number.
For example:
Setting for CATV channel "125"-
For example:
Setting for CATV channel "25"F2 - AUDIO Level Control
The setting of this screwdriver adjustment determines the aural carrier deviation. Clockwise rotation increases the carrier deviation.
2 5 2 5
F3 - VIDEO Level Control
The setting of this screwdriver adjustment determines the video modulation level.
Clockwise rotation increases the modulation depth.
CATV
+100
CATV
BC
TV
CATV
+100
CATV
BC
TV
F4 - Channel Number Switch
Sets the desired operating channel for standard
CATV channels 02 through 125 or Broadcast
TV channels 02 through 69. See also Item F5 which sets the type of channel (CATV or
Broadcast TV) and sets the leading “1” for
CATV channels 100 through 125.
F6 - A/V Ratio Control
This screwdriver adjustment varies the level of the aural carrier over a range from 11 to
18 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.
F7 - RF Output Level
This screwdriver adjustment permits decreasing the RF output level a minimum of 15 dB as the control is rotated counterclockwise. Set the control for a +45 dBmV output level .
REAR PANEL CONNECTIONS / INTERNAL JUMPERS 3
R1
R2
R3
R4
R1 - VIDEO INPUT Connector
This is the baseband video input to the IF circuits. This input accepts baseband input levels from 0.6 Vp-p to 1.5 Vp-p.
R2 - AUDIO INPUT Connector
This is an unbalanced audio input to the IF circuits. This “RCA” (phono) connector input accepts baseband audio from 100 mVrms to
3 Vrms levels.
NOTE: An internally selected test point jumper defeats the audio pre-emphasis for stereo capability. See the illustration on this page.
Figure 2
4.5 MHz Audio Input: This AUDIO INPUT can also accept a 4.5 MHz audio modulated carrier by reconfiguring two specified internal jumper settings. Required 4.5 MHz input level is
+40 dBmV ±2 dB. Some stereo generators or satellite receivers provide audio output in a
4.5 MHz audio modulated carrier format. See the illustration on this page.
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 output.
PRE-EMPHASIS / FLAT:
A.
B.
A.
AUDIO - FLAT
AUDIO PRE-EMPHASIS
(factory setting)
AUDIO INPUT CONNECTOR:
C.
B.
AUDIO INPUT -
Baseband audio,
(factory setting)
C.
B.
AUDIO INPUT -
4.5 MHz modulated carrier
C.
Figure 3
4 INSTALLATION
CONNECTIONS AND CONTROLS
All connections to and from each modulator are made through the rear panel. Figure 4 illustrates an installation with (12) modulator units combined through a passive signal combiner. Additional channels can be added by using additional fixed channel or agile type 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
AUDIO INPUTS
AC POWER
CORD VIDEO INPUTS maintain a ±1 dB variation of adjacent channel carriers. 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 wherever possible, and some air movement is mandatory in enclosed rack cabinets.
Excessive heat will shorten component life and modulator performance will be degraded without proper cooling.
MODULATOR UNITS
(Fixed channel and/or Agile types)
DC POWER
CABLE
RF COMBINER
SYSTEM OUT
Figure 4
POWER SUPPLY REQUIREMENT
This VMM806AG agile modulator requires more current than the fixed channel units. Therefore, new 12 position rack installations with multiple
VMM806AG modulators (up to 12) must use the
Drake PSM121 (or equivalent) high capacity power supply module (4.5 A rating @ 5 VDC and 3 A @ 12 VDC).
If more than one VMM806AG unit will be used, the power supply module must be upgraded to the high capacity PSM121, if not already in place.
The power supply in the four position rack system can power up to four VMM806AG modulators or any mix of fixed and agile VMM models up to four total modulators.
If you are retrofitting a 12 position rack installation and replacing only one of 12 fixed channel modulators with the VMM806AG agile unit, you may continue to use the standard capacity power supply.
CATV CHANNEL OUTPUT FREQUENCIES 5
TABLE 1: CATV CATV
+100
CATV
BC
TV
Output Channel
Switch Setting
65
66
67
68
69
61
62
63
64
56
57
58
59
60
52
53
54
55
47
48
49
50
51
43
44
45
46
38
39
40
41
42
34
35
36
37
29
30
31
32
33
25
26
27
28
21
22
23
24
17
18
19
20
12
13
14
15
16
08
09
10
11
02
03
04
05
06
07
Visual Carrier
Frequency (MHz)
Frequency
Offset (kHz)
415.25
421.25
427.25
433.25
439.25
445.25
451.25
457.25
463.25
469.25
475.25
481.25
487.25
493.25
307.25
313.25
319.25
325.25
331.25
337.25
343.25
349.25
355.25
361.25
367.25
373.25
379.25
385.25
391.25
397.25
403.25
409.25
151.25
157.25
163.25
169.25
217.25
223.25
229.25
235.25
241.25
247.25
253.25
259.25
265.25
271.25
277.25
283.25
289.25
295.25
301.25
55.25
61.25
67.25
77.25
83.25
175.25
181.25
187.25
193.25
199.25
205.25
211.25
121.25
127.25
133.25
139.25
145.25
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
NONE
NONE
+12.5
+12.5
+12.5
+12.5
+25
+12.5
+12.5
+12.5
+12.5
NONE
NONE
NONE
NONE
NONE
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
+12.5
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
±12.5
±12.5
±12.5
NONE
NONE
CATV
+100
CATV
BC
TV
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
Frequency
Offset (kHz)
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
+25
+25
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
6 BROADCAST TV CHANNEL OUTPUT FREQUENCIES
TABLE 2: BC TV
CATV
+100
CATV
BC
TV
CATV
+100
CATV
BC
TV
Channel Number
Visual Carrier
Frequency (MHz)
7
8
9
10
11
12
13
4
5
6
2
3
55.25
61.25
67.25
77.25
83.25
175.25
181.25
187.25
193.25
199.25
205.25
211.25
Channel Number
Visual Carrier
Frequency (MHz)
531.25
537.25
543.25
549.25
555.25
561.25
567.25
573.25
579.25
471.25
477.25
483.24
489.25
495.25
501.25
507.25
513.25
519.25
525.25
585.25
591.25
597.25
603.25
609.25
615.25
621.25
627.25
633.25
639.25
645.25
651.25
657.25
663.25
669.25
735.25
741.25
747.25
753.25
759.25
765.25
771.25
777.25
783.25
789.25
795.25
801.25
675.25
681.25
687.25
693.25
699.25
705.25
711.25
717.25
723.25
729.25
42
43
44
45
46
38
39
40
41
53
54
55
56
47
48
49
50
51
52
61
62
63
64
65
57
58
59
60
66
67
68
69
34
35
36
37
28
29
30
31
32
33
23
24
25
26
27
14
15
16
17
18
19
20
21
22
SPECIFICATIONS 7
RF
Frequency Range:
FCC Frequency Offsets:
Output level:
Output Impedance:
A/V Ratio:
Frequency Stability:
Intercarrier Frequency:
Spurious Outputs (5 MHz to 900 MHz):
In-channel C/N:
Broadband Noise:
54 to 806 MHz;
Standard CATV channels 2 to 125,
Broadcast TV channels 2 to 69.
Automatic (+12.5 kHz, +25 kHz, or none as required for each channel).
+45 dBmV (minimum -15 dB adjustment range).
75 Ohms, 10 dB return loss.
Audio carrier level, adjustable from -19 to -12 dB (±2 dB) referenced to video carrier level.
Within ±5 kHz from 54 to 550 MHz including all aeronautical/
FCC offset channels.
Within ±7.5 kHz from 550 to 806 MHz.
4.5 MHz ±50 Hz.
-60 dBc typical, measured at -15 dB A/V ratio and with modulator output level of +45 dBmV.
60 dB typical, 4 MHz bandwidth.
-78 dBc typicial, 4 MHz bandwidth @ +45 dBmV output.
VIDEO
Input Level for 87.5% Modulation:
Input Impedance:
Frequency Response:
C/L Delay:
Differential Gain:
Differential Phase:
0.6 Vp-p to 1.5 Vp-p. Manual gain adjust with front panel control.
75 Ohms, return loss of 20 dB minimum.
20 Hz to 4.2 MHz, ±1 dB.
Within 50 nSec. of 0 nSec. (standard), or
FCC predistortion, (option).
3% maximum (10 to 90% APL).
3 0 maximum (10 to 90% APL).
AUDIO
Input Level for 25 kHz Peak Deviation:
Input Impedance:
Pre-emphasis:
Frequency Response:
S/N ratio:
Total Harmonic Distortion:
125 mV rms to 3 V rms. Manual gain adjust with front panel control.
Greater than 10 K Ohms, unbalanced.
75
µ
Sec., defeatable by internal jumper for BTSC baseband stereo compatibility.
40 Hz to 15 kHz, ±2.0 dB referenced to 75
µ
Sec.
pre-emphasis curve.
40 Hz to 100 kHz, ±0.5 dB if pre-emphasis is defeated.
55dB.
1% maximum.
4.5MHz INPUT
(AUDIO INPUT Connector –
Input Impedance:
Input Level: selected by internal jumpers).
75 Ohms.
+40 dBmV ±2 dB for -15 dB A/V ratio.
GENERAL
DC Power Input:
Operating Temperature:
Size:
Weight:
+12 V ±5% at 160 mA typical, 180 mA maximum.
+5 V ±5% at 330 mA typical, 380 mA maximum.
0 0 C to +50 0 C ambient.
1” W x 3.5” H x 7.5” D. (2.5 cm) W x (8.9 cm) H x (19.1 cm) D.
10.7 oz. (0.3 Kg).
Specifications subject to change without notice or obligation.
