TELSAT® COMMUNICATIONS LTD

CMA-700 Frequency Agile Audio/ Video Modulator For Adjacent Channels In
CATV Headend System

  • Precision saw filter provides superior vestigial side band filtering and great spurious rejection.
  • PLL circuit ensures high frequency accuracy (deviation of fc <= 2 k Hz for every channel .)
  • Video modulation automatic level control.
  • High frequency response, channel stability and low output spurious.
  • External I.F. loop-through.

VIDEO
input type Composite video negative sync
input level 0.5Vpp min for 87.5% modulation
Frequency response >6.5mHz (3 dB)
Video impedance 75ohms RCA connector
Differential gain 5%typ
Differential phase 5Ctyp
C/L delay <60ns
Video S/N >45dB
AUDIO
Input type Unbalanced
Input impedance >10Kohms RCA/Cinch connector
input sensitivity 100mV-PP for 60kHz deviation
Signal to noise ratio 50dB
Freq response +- 1dB, 50Hz to15kHz
Peak deviation +-30kHz
Subcarrier frequency 4.5mhz (NTSC), 5.5mHz, (PAL B/G);
6.5 MHz (PAL D & K)
Distortion 1% 30mHz to 15kHz,25kHz deviation
Per-emphasis 75uS
Common mode hum rejection 38 dB
RF OUTPUT
Output frequency 47~550mHz
Output level range CMA-700H : >120dBuV
CMA-700L : 95~105 dB uV
Output impedance 75 ohms (F-connector)
spurious output 60dB below video carrier
Frequency accuracy +-2kHz, PLL control
POWER
Power supply 117Vac+-10%, 60Hz or 230Vac +-10% 50Hz
Power consumption 5W


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Telsat® Communications Ltd

P O Box 1537, 17 Westhaven Grove,
Palmerston North, (Knowledge City)
NEW ZEALAND. Established in 1988.
Tel: +64-6-356-2749, Fax: +64-6-355-2141

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