DRAKE VM2860 User Manual download pdf

VM2860 / VM2862 Commercial Video Modulator

VM2860 VIDEO MODULATOR

POWER

NORMAL

OVER-MOD

VIDEO

LEVEL

NORMAL

OVER-MOD

AUDIO

LEVEL

A / V RATIO

RF OUTPUT

EAS ACTIVE

CATV

CATV +

100

CHANNEL

2 5

SPECIFICATIONS - VM2860 / VM2862

Frequency Range:

FCC Offsets:

Output Level:

Amplitude Stability:

Output Impedance:

A/V Ratio:

Frequency Stability:

Spurious Outputs:

Phase Noise:

Output Filter Bands:

Broadband Noise:

VIDEO

Input Level:

Input Impedance:

Frequency Response:

In-channel C/N:

L/C Delay:

Differential Gain:

Differential Phase:

MONO AUDIO

Input Level:

Input Impedance:

54 MHz to 864 MHz.

Standard CATV channels 2 to 135.

Broadcast, HRC, and IRC channel plans available by

internal jumper.

Automatic, positive.

+60 dBmV minimum, 12 dB minimum adjustment

range.

± 1 dB.

75 Ohms, 12 dB return loss within output filter

passband.

-12 dB to -25 dB.

± 5 ppm. All oscillators locked to the same internal

reference.

-60 dBc at +60 dBmV output level, 5 MHz to

1000 MHz, 15 dB A/V ratio.

-85 dBc at 10 kHz offset.

54 MHz to 258 MHz, 258 MHz to 462 MHz, 462 MHz

to 660 MHz, 660 MHz to 864 MHz.

-80 dBc, 4 MHz bandwidth, +60 dBmV output level,

±18 MHz offset within output filter passband, -90 dBc

outside of output filter passband, output filtered into 4

approximately 200 MHz wide bands.

1 Vp-p ± 3 dB, manual gain adjustment with

modulation indicators.

75 Ohms, 25 dB return loss.

20 Hz to 4.2 MHz, ± 1 dB with 4.5 MHz trap off,

20 Hz to 4.1 MHz, ±1 dB with 4.5 MHz trap on.

65 dB.

±50 nS of FCC predistortion with 4.5 MHz trap off,

-20 +80 nS of FCC predistortion with 4.5 MHz trap on.

± 3%.

± 3

250 mVrms to 2.5 Vrms, manual gain adjustment with

LED modulation indicators.

10K Ohms, unbalanced.

An auto-switching alternate IF input, labeled EAS input, is provided

for connection of an Emergency Alert System 44 MHz IF signal.

When the EAS IF signal appears at the EAS input, the main video

and audio modulated IF is replaced by the EAS input signal.

A 4.5 MHz video trap may be selected via an internal jumper

(VM2862 has 4.5 MHz trap on as factory setting). This may be used

to filter off a 4.5 MHz sound subcarrier or undesired video

components to prevent interference to the stereo or SAP channels.

The RF section of the modulator contains bandpass filtering that

divides the 54 to 862 MHz output range into four bands, each

approximately 200 MHz wide. This filtering, in conjunction with the

use of high level, low noise floor mixing, ensures very low

broadband noise at the output. Thus a full complement of up to all

134 available channels from VM2860 or VM2862 modulators may

be combined while maintaining an excellent C/N of each channel.

All of the mentioned features, combined with a carefully designed

low noise and low distortion output stage, provide reliable operation

in a densely crowded SMATV or CATV environment.

The inclusion of a fan in the VM2860 and VM2862 permits rack

mounting of this equipment without leaving the typical 1U air space

between modulators.

75 µS.

50 Hz to 15 kHz, ±1 dB.

0.5% maximum.

65 dB.

(VM2862 only)

250 mVrms to 2.5 Vrms, manual gain adjustment with

LED modulation indicators.

10K Ohms, unbalanced.

30 db, 50 Hz to 12.5 kHz; 25 dB, 12.5 kHz to 14 kHz.

± 0.5 dB, 50 Hz to 14 kHz.

0.5% maximum.

65 dB.

(VM2862 only)

250 mVrms to 2.5 Vrms, manual gain adjustment with

over-modulation indicator.

10K Ohm, unbalanced.

±2 dB, 50 Hz to 10 kHz.

1% maximum.

80 dB.

+30 dBmV, ±1 dB (visual carrier).

75 Ohm, 20 dB return loss.

60 dB.

+20 dBmV.

115 VAC ± 10%, 60 Hz,

23 Watts (VM2860), 28 Watts (VM2862).

1/2 Amp Slo-Blo 5 X 20 mm.

0° to 50° C.

Internal 1.85 CFM fan allows operation in the rack

without air spaces between units.

FCC Part 15.

11.25" D x 1.75" H x 19" W

8 lbs. 8 oz.

DESCRIPTION

The R.L Drake VM2860 and VM2862 Video Modulators are high

quality, vestigial sideband units with synthesized visual and aural

carriers. They are designed to accept NTSC video and audio

baseband signals from a satellite receiver or similar equipment.

Front panel video and audio level controls with accompanying

modulation indicators permit easy setup of the proper modulation

levels. The A/V ratio and RF output level controls are also provided

on the front panel. A rear panel EAS alternate IF input is also

provided. The VM2860 model is for applications with mono audio

and the VM2862 model provides BTSC stereo encoded audio. If

SAP is required, this option is available for the VM2862 model, and

is field installable.

Synthesized operation provides complete frequency agility, allowing

front panel selection of any standard CATV channel from 2 to 135

(54 to 862 MHz band). FCC required offsets for aeronautical

channels are automatically provided for each channel that requires

an offset. For special applications, IRC or HRC CATV frequencies

or off-air broadcast frequencies can be selected after moving an

internal jumper.

A high quality IF SAW filter with FCC predistortion eliminates

adjacent channel interference and provides optimum delay

characteristics.

MONO AUDIO, cont'd.

Pre-emphasis:

Frequency Response :

THD:

S/N:

BTSC STEREO AUDIO

Input Level:

Input Impedance:

Separation:

Frequency Response:

THD:

S/N:

SAP AUDIO Option

Input Level:

Input Impedance:

Frequency Response:

THD:

S/N:

EAS INPUT

Level :

Impedance:

Isolation:

Auto Switching Level:

GENERAL

AC Power:

Fuse:

Temperature Range:

Cooling:

Radiated Emissions:

Size:

Weight:

Order From:

800-423-2594

www.multicominc.com

[email protected]om

1 2 3

Order From: 1
800-423-2594 1

Summary of Contents

Page 1 - 800-423-2594

VM2860 / VM2862 Commercial Video ModulatorVM2860 VIDEO MODULATORPOWERNORMALOVER-MODVIDEOLEVELNORMALOVER-MODAUDIOLEVELA / V RATIORF OUTPUTEAS ACTIV

Page 2

VM2860 VIDEO MODULATORPOWERNORMALOVER-MODVIDEOLEVELNORMALOVER-MODAUDIOLEVELA / V RATIORF OUTPUTEAS ACTIVECATVCATV +100CHANNEL2 5Front Panel Controls a

Page 3

SAP LEVELL RVIDEO INAUDIO INEAS INRF OUTPUTSAPOVER MODUL ATIONSAP AUDIO INFUSE.5 A / 25 0 VSLO- BLO115 VAC, 60 Hz27 WATTMADE IN THE

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DRAKE VM2860 User Manual

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Summary of Contents

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