IF70 FM VIDEO IF SYSTEM

The IF70 is a general purpose FM TV IF system operating at 70 MHz,and employing LSI IC devices and a SAW filter to eliminate tricky alignment and setup adjustments. This frequency is commonly used for terrestrial microwave FMTV and Amateur TV reception as an intermediate frequency. The IF70 supports FMTV operation with 2 to 4 MHz signal deviation, and uses standard NTSC sound subcarrier (4.5 MHz) to reduce bandwidth requirements. 5.8 and 6.0 MHz operation can be supported by substitution of appropriate audio subcarrier filter components. Standard CCIT De-emphasis is incorporated and provisions for video polarity switching are on board. A received-signal strength indicator output is provided and video and audio outputs are standard NTSC line levels and will directly interface with most monitors and other video devices. Signal input levels should be -60 dBm or more to ensure good limiting. this will be no problem with 40 dB gain downconverters.

The IF70 will directly interface with our downconverters for 900 MHz and 1300 MHz reception. Power requirement is either 12V AC 60 Hz or 12V DC negative ground. Current consumption is about 120-140 ma. PC board size is 2.5"W x 4.0"L x 1 inch in height. Setup is simple with only a DVM and some source of 70 MHz unmodulated carrier needed for setup. Default adjustments are possible for setup, final setup being done after installation in a system, as the two setup adjustments are noncritical.

• Hardware package All connectors, switches, wire, LEDs, fasteners, and spacers for mounting in typical enclosure.
• Case NC531
• Case Kit