The CATV Channelized Audio/Video Modulator, Channel 72, from Blonder Tongue is an all-solid-state audio/video modulator that provides a modulated visual and aural RF carrier output on one specific CATV channel. The unit modulates the audio and video inputs and provides the requested RF CATV channel output for use in a CATV, MATV or SMATV system. The modulator accepts standard (sync negative) polarity video at a 0.7-2.5V peak to peak level from sources such as a TV camera, video tape recorder, TV demodulator or satellite receiver.
The modulator features a +55dBmV RF output level, and an IF SAW filtering for adjacent channel operation. All aeronautical channels are offset positive with a tolerance of �5kHz as required by FCC 21006. All level controls are located on the front panel. The RF level control provides up to +55dBmV output. The video modulator control sets the depth of modulation for 87.5% over an input video level range from 0.7VP/p to 2.5VP/p. An audio modulation control permits adjustment for �25kHz peak deviation of the aural carrier.
- Meets FCC docket 21006 aeronautical frequency offset requirements
- Fully compatible with BTSC encoded stereo audio
- Front panel accessible level controls for easy set-up and adjustments
- AC outlet
In the Box
Blonder Tongue CATV Channelized Audio/Video Modulator with SAW Filtering (Channel 72)
- Screws for Standard 19" EIA Rack Unit Installation
- Limited 1-Year Warranty
| RF Specification |
| Frequency Range | CATV channel 72 |
| Output Level | 55 dBmV, minimum |
| Output Level Range | 15 dB |
| Audio/Video Carrier Ratio Control | -7 dB to -20 dB |
| Frequency Tolerance | �10 kHz standard channels, �5 kHz FCC 21006 offsets |
| Audio Carrier Frequency Setting | �1 kHz maximum, 4.5 MHz above video carrier |
| RF to Video Response | 1 dB P/V from Fv -0.5 MHz to Fv +4.2 MHz |
| Broadband Noise | -90 dBc |
| Spurious Output | -60 dBc in 50 to 860 MHz Range @ +55 dBmV output |
| Output Match (Return Loss) | 12 dBc |
| Vestigial Sideband Response | @ channel edge -20 dB, @ adjacent channel -40 dB |
| Video |
| Input | 0.7 to 2.5 V peak to peak for 87.5% modulation |
| Input Return Loss | 18 dB |
| Carrier-to-Noise Ratio | 62 dB in 4 MHz bandwidth |
| Hum Ratio | 60 dB peak to peak video to 60 Hz RMS |
| Differential Gain | 5% at 87.5% modulation |
| Differential Phase | 5� at 87.5% modulation |
| Group Delay | 170 �50 nS |
| Audio |
| Input Impedance | 10 k?, unbalanced |
| Input | 140 mV RMS for 25 kHz peak deviation |
| Frequency Response | �1.0 dB (50 Hz - 15 kHz referent to standard 75 msec pre-emphasis) |
| Intercarrier Stability | 4.5 MHz at �5.0 kHz |
| General |
| Power Requirements | 105 - 130 VAC, 60 Hz, 10.5 W |
| Temperature Range | 0 to +50�C |
| Connectors |
| Audio In | F-type female |
| Video In | F-type female |
| RF Output | F-type female |
| RF Output Test | F-type female -30 dB |
| AC Outlet | Female AC outlet 600 VA maximum |
| Mechanical |
| Line Cord | 6' power cable: 3 wire grounded, 3 wire convenience outlet |
| Dimensions (W x H x D) | 19 x 1.75 x 3" (48.26 x 4.44 x 7.62 cm) |
| Weight | 4 lb (1.8 kg) |
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