Vm2551, Agile commercial video modulator, Specifications – Toner Cable VM2551 Frequency Agile Modulator User Manual
Page 2
Specifications Subject To Change Without Notice
Rev 12-11
©Toner Cable Equipment, Inc.
969 Horsham Road
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Horsham, Pennsylvania 19044 USA
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Phone: 215-675-2053 Fax: 215-675-7543
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RF
Frequency Range:
82 channels, 54-550 MHz CATV channels 2-78 and 95-99.
Off-air channels 2-27.
Output Level:
+55 dBmV, (typically adjustable +40 to +55 dBmV)
Output Impedance:
75 Ohms, return loss of 12 dB nominal. Type "F" connector.
AV Ratio:
Audio carrier -18 to -12 dB referenced to video carrier, adjustable.
Frequency Stability:
Visual carrier within ±5 kHz on FCC offset channels, ±10 kHz on
all channels.
Intercarrier Frequency:
4.5 MHz ± 2 kHz.
FCC Frequency Offsets:
Automatic (+12.5 kHz or +25 kHz for aeronautical channels)
In-Channel C/N:
62 dB typical, 60 dB minimum.
Spurious Outputs:
-60 dBc minimum, measured at -15 dB A/V ratio and with modulator
output level of +55 dBmV
Broadband Noise:
-75 dBc typical, referenced to video carrier. (4 MHz BW @ ±12 MHz
or greater offset)
Video
Input Level for 87.5%:
1 Vp-p ±3 dB, manual gain adjust with overmodulation indicator.
Input Impedance:
75 Ohms, Type "F" connector.
Frequency Response:
30 Hz to 4.2 MHz, ±1.5 dB
Video S/N:
60 dB, luminance weighted
Differential Gain:
±5% (10 to 90% APL)
Differential Phase:
±5 degrees (10 to 90% APL)
L/C Delay:
Within 50 nSec of FCC predistortion. Complies with FCC rules: 76.605
Audio
Input level for 25KHz Peak
175 mV rms minimum. 250 mV rms nominal. Manual gain
Deviation @ 1KHz tone:
adjustment with front panel control and overmodulation indicator.
Input Impedance:
10K Ohms, unbalanced. RCA Phono connector.
Pre-emphasis:
75 µSec, defeatable
Frequency Response:
50Hz to 15kHz, ±1.5 dB, referenced to 75 µSec pre-emphasis curve.
Total Harmonic distortion:
1.5% maximum
Hum and noise:
-60 dBm minimum, referenced to 25 kHz peak deviation.
4.5 MHz Input Level:
37 dB mV for -15 dB A/V ratio. (Change internal jumper to activate.)
Input connector is type "F".
Composite IF Loop
Loop Level:
+40 dBmV (visual carrier)
IF Frequency:
45.75 MHz visual carrier, 41.25 MHz aural carrier. Loop output is after
SAW filtering.
Loop Input/Output
Impedances:
75 Ohms, Type "F" connectors.
Isolation:
Greater than 60 dB
General
AC Power Input:
115 VAC, ±10%, 60 Hz, 16 watts
Operating Temperature Range: 0° to 50° C, ambient
Size:
1.75"H x 19"W x 11.8"D
Weight:
9.25 lbs. (4.2 Kg)
Specifications
VM2551
Agile Commercial Video Modulator