Drake VMM806AG Instruction Manual

8 WARRANTY AND SPECIFICATIONS

THREE YEAR LIMITED WARRANTY

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:

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

(2)Notify the R.L. DRAKE COMPANY 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 the R.L. DRAKE COMPANY 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 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)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 COMPANY’S entire obligation with respect to this product, and the original purchaser shallhave 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

P/N: 3852416H-12-2003 Printed in U.S.A.

® VMM806AG VIDEO MODULATOR		1
12 POSITION RACK MOUNT	POWER SUPPLY
	POWER SUPPLY
MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR MODULATOR	MODULATOR MODULATOR

AUDIO

VIDEO

VIDEOVMM806AG

VIDEO

PWR

POWER

PWR

ERROR

AUDIO

A / V

VIDEO

A / V

CATV

+100

A / V

4 POSITION OR	VMM806AG and other compatible
RACK MOUNT	modular units

POWER SUPPLY

VMM806AG

POWER

ERROR

AUDIO

VIDEO

2 5

CATV

CATV BC +100 TV

A / V

VMM806AG

POWER

ERROR

AUDIO

VIDEO

2 5

CATV

CATV BC +100 TV

A / V

VMM806AG

POWER

ERROR

AUDIO

VIDEO

2 5

CATV

CATV BC +100 TV

A / V

VMM806AG

POWER

ERROR

AUDIO

VIDEO

2 5

CATV

CATV BC +100 TV

A / V

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

F1
VMM806AG
F2		POWER
		ERROR
		AUDIO
F3		VIDEO
F4	2	5
F5	CATV
CATV		BC
+100		TV
F6		A / V
F6		RF
		RF
F7

Figure 1

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.

Clockwise rotation increases the modulation depth.

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.

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:	For example:
Setting for CATV	Setting for CATV
channel "125"-	channel "25"-

CATV

+100

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

Figure 2

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.

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.	AUDIO - FLAT
	AUDIO PRE-EMPHASIS
	(factory setting)
A.
AUDIO INPUT CONNECTOR:
B.	B.
C.	AUDIO INPUT -
AUDIO INPUT -	AUDIO INPUT -
Baseband audio,	4.5 MHz modulated
(factory setting)	carrier
C.	C.

Figure 3

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