Drake VMM860AG User Manual

MODULATOR MODULATOR MODULATO

MODULATOR MODULATOR MODULATOR

8 WARRANTY AND SPECIFICATIONS

THREE YEAR LIMITED WARRANTYTHREE YEAR LIMITED WARRANTY

THREE YEAR LIMITED WARRANTY

THREE YEAR LIMITED WARRANTYTHREE 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 3
years from the date of original purchase.

During the warranty period R.L. DRAKE HOLDINGS, LLC or an authorized Drake servicer 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 warranty service, the original purchaser must:

)1( )1(

(1) Retain invoice or original proof of purchase to establish the start of the warranty period.

)1( )1(

)2( )2(

(2) Notify R.L. DRAKE HOLDINGS, LLC or the nearest authorized service facility, as soon as possible after discovery of a possible defect

)2( )2(

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( )3(

(3) Deliver the product to R.L. DRAKE HOLDINGS, LLC or the nearest authorized service facility, or ship the same in its original container

)3( )3(

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 HOLDINGS, LLC determines is due to:

)1( )1(

(1) Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications

)1( )1(

of the original parts.

)2( )2(

(2) Misuse, abuse, neglect or improper installation.

)2( )2(

)3( )3(

(3) Accidental or intentional damage.

)3( )3(

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 HOLDING’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 lim itation 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.

®

VMM860AG/VMM860AS VIDEO MODULATORS 1

12 POSITION RACK MOUNT POWER SUPPLY

AUDIO

VIDEO

PWR

A/ V

#

CH

RF

4 POSITION

RACK MOUNT

AUDIO

VIDEO

PWR

A/ V

#

CH

RF

IO

AUDIO

AUD

AUDIO

VIDEO

VIDEO

VIDEO

PWR

PWR

A/ V

RF

PWR

A/ V

A/ V

#

CH

#

#

CH

CH

RF

RF

VMM860AG, VMM860AS

MODULATOR MODULATOR MODULATOR

AUDIO

VIDEO

PWR

A/ V

#

CH

RF

AUDIO

AUDIO

VIDEO

VIDEO

PWR

PWR

A/ V

A/ V

#

#

CH

#

CH

CH

RF

RF

OR

MODULATOR MODULATOR

AUDIO

VMM806AG

VIDEO

POWER
ERROR

PWR

AUDIO

A/ V

VIDEO

#

CH

2

5

RF

CATV

BC

CATV

TV

+100

A/ V

RF

IO

AUD

AUDIO

VIDEO

VIDEO

PWR

PWR

A/ V

A/ V

#

CH

RF

RF

and other compatible modular units

POWER SUPPLY

POWER SUPPLY

BC

VMM806AG

VMM806AG

CATV

+100

TV

5

VIDEO

POWER

ERROR

A/ V

RF

AUDIO

2

CATV

BC

TV

5

POWER

ERROR

VIDEO

A/ V

RF

AUDIO

2

CATV

CATV

+100

VMM806AG

BC

TV

5

POWER

ERROR

VIDEO

A/ V

RF

AUDIO

2

CATV

VMM806AG

CATV

+100

BC

TV

5

POWER

ERROR

VIDEO

A/ V

RF

AUDIO

2

CATV

CATV

+100

®

R.L. DRAKE HOLDINGS, LLC

710 Pleasant Valley Drive

CUSTOMER SERVICE AND PARTS TELEPHONE:

WEB SITE: http://www.rldrake.com

© Copyright 2013 R.L. Drake Holdings, LLC Printed in Taiwan

Springboro, OHIO 45066

[phone]

TELEFAX:

[phone]

® is a registered trademark of R.L. Drake Holdings, LLC

The VMM860AG and VMM860AS modulators
are members of the R.L. Drake 19" Mini-Rack
Series, 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 Drake model RMM12, 12 position rack
mount. The RMM4 rack mount accepts up to
(4) modular units.

The R.L. Drake VMM860AG Audio-Video
Modulator is a high quality, vestigial sideband
unit with synthesized visual and aural carriers.
The frequency agile VMM860AG allows front
panel pushwheel switch selection of standard
CATV channels 2 through 135, 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 VMM860AS has all of the features and
specifications of the VMM860AG plus the
additional capability of BTSC stereo audio.

The heterodyne conversion system, in
conjunction with the use of a SAW filter,
ensures optimum vestigial selectivity for
adjacent channel headends. A FCC
predistortion SAW response is standard.

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 VMM860AS has both a left and
right audio input to accomodate stereo sources.

All level controls are located on the front panel
for ease of operation. Output level is +45
dBmV and is adjustable over a 10 dB range.

On the VMM860AG, an audio pre-emphasis
defeat, rear pane

l switch allows transmission of
BTSC encoded baseband stereo audio signals
when used with the external Drake MMTS20
stereo encoder. A stereo encoder is built into
the VMM860AS model.

2 FRONT PANEL CONTR OLS and INDICATORS

SPECIFICATIONS 7

F1
F2
F3
F4
F5
F6

CATV
+100

VMM860AG

POWER/
ERROR

AUDIO

VIDEO

2

CATV

A/V

RF

VMM860AG VMM860AS

5

BC
TV

F7

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.

F2 - AUDIO Level Control

The setting of this screwdriver adjustment
determines the aural carrier deviation. Clock­wise rotation increases the carrier deviation.

F3 - VIDEO Level Control

The setting of this screwdriver adjustment
determines the video modulation level. CW
rotation increases the modulation depth.

F4 - Channel Number Switch

Sets the desired operating channel for standard
CATV channels 02 through 135 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 135.

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 135. See also Item F4 for setting
the channel. Here are two examples:

VMM860AS

PWR P.LK

A

V

5

2

C AT V

CATV

BCTV

+100

A / V

R F

Figure 1

Setting for CATV Setting for CATV
channel "125"- channel "25"-

2

5

CATV
+100

CATV

BC
TV

CATV
+100

F6 - A/V Ratio Control

This screwdriver adjustment varies the level of
the aural carrier over a range from 12 to 22 dB
below the visual carrier. Typically, the aural
carrier should be adjusted to approximately 15
dB below the visual carrier. Clockwise rotation
increases the aural carrier level.

F7 - RF Output Level

This screwdriver adjustment permits adjustment
of the RF output level over a minimum of 10 dB
range. Maximum output is at full CW.

F8 - P. LK (Pilot Lock)

This LED indicates that the BTSC circuitry in
the VMM860AS has locked to the video sync
reference.

F9 - Audio Overmodulation

This LED illuminates when the audio input level
reaches full modulation. Set F2 for just an
occasional flicker. (VMM860AS)

F10 - Video Overmodulation

This LED illuminates at 87.5% video modula­tion. Advance F3 CW until F10 just lights then
back off until F10 just goes out. (VMM860AS)

2

CATV

5

F8
F9
F10

BC
TV

Frequency Range:

RF

FCC Frequency Offsets:

Output level:

Output Impedance:

A/V Ratio:

Frequency Stability:

Output Flatness:

Output Amplitude Stability:

Intercarrier Frequency:

Spurious Outputs (5 to 900 MHz):

In-Channel C/N:

Broadband Noise:

VIDEO

Input Level for 87.5% Modulation:

Video Over-modulation LED:

Input Impedance:

Frequency Response:

C/L Delay:

Differential Gain:

Differential Phase:

AUDIO , VMM860A G

Input Level for +/- 25 kHz Deviation:

Input Impedance:

Pre-emphasis:

Frequency Response:

S/N ratio:

Total Harmonic Distortion:

AUDIO , VMM860AS

Input Level:

Over Modulation Indicator:

Input Impedance:

Channel Separation:

Frequency Response:

S/N Ratio:

THD:

GENERAL

DC Power Input:

Operating Temperature:

Size:

Weight:

54 to 864 MHz; Standard, HRC, or IRC CATV channels 2 to
135, Broadcast TV channels 2 to 69.
Automatic (+12.5 kHz, +25 kHz, or none as required).
+45 dBmV minimum (10 dB adjustment range).
75 Ohms, 8 dB return loss.
Audio carrier level, adjustable from -22 to -12 dB
referenced to video carrier level.
Within ±5 kHz
From 54 to 864 MHz, less than 3 dB change.
±1 dB

4.5 MHz

-60 dBc, (-15 dB A/V ratio and output level of +45 dBmV).
65 dB typical, 4 MHz bandwidth.

-78 dBc typicial, 4 MHz bandwidth @ +45 dBmV output.

0.65 Vp-p to 1.5 Vp-p. Gain adjust with front panel control.
Trips at 87.5 % depth of modulation. (VMM860AS only)
75 Ohms, return loss of 26 dB minimum.
20 Hz to 4.2 MHz, ±1 dB.
Within 50 nSec. of FCC predistortion.
3% maximum (10 to 90% APL).
30 maximum (10 to 90% APL).

125 mV rms to 2.5 V rms. Manual gain adjust with
front panel control.
Greater than 10 K Ohms, unbalanced.
75 µSec. normal, defeatable (flat) by rear panel switch for
BTSC baseband stereo compatibility.
40 Hz to 15 kHz, ±1.0 dB referenced to 75 µSec.
pre-emphasis curve.
40 Hz to 100 kHz, ±0.5 dB if pre-emphasis is defeated.
65 dB.
Less than 0.5 %.

250 mV to 2.5 V rms for 25 kHz L+R deviation.
Trips at ±25 kHz L+R deviation.
Greater than 10 K Ohms, unbalanced.
> 30 dB from 100 Hz to 10 kHz.
> 25 dB from 10 kHz to 14 kHz.
±1 dB of 75 µSec pre-emphasis curve, 50 Hz to 14 kHz.
> 60 dB
Less than 0.5 %

+12 V ±5% at 200 mA (AG) or 220 mA (AS).
+5 V ±5% at 350 mA (AG) or 400 mA (AS).
00 C to +500 C ambient.
1” W x 3.5” H x 7.5” D (AG) or 8" D (AS)
12 oz. (AG) or 13.5 oz. (AS)

Specifications subject to change without notice or obligation.