IF66

VIDEO IF FOR 66-72 MHz

The IF66 is a basic IF strip system that is designed to convert television signals having a 61.25 or 67.25 MHz frequency (CH3 or CH4 VHF channels) commonly used as an IF output for ATV downconverters, and also VCR, game, and cable box signals, to baseband video and audio signals. The output signals are standard 1V p-p neg sync 75ohm NTSC video and 0.5 V rms hi-Z ( 5000 ohm ) audio line level signals, and also has reverse AGC output to directly interface with our 440, 900, and 1300 MHz downconverters, and many other RF tuners using MOSFET or GASFET RF stages. The IF66 is compatible with NTSC operation and will directly drive most monitors, camcorders, and other video devices. If needed, the AFC voltage can be used for LO control of the front end if this is required. AFC is defeatable with a switch connection to ground.

APPLICATIONS:

While many TV sets and VCRs provide baseband video output, the IF66 provides the same function in a much smaller package with lower power requirements, and avoids tying up a more expensive and much larger video device for this purpose.

The IF66 will operate from either VHF CH3 or CH4 inputs and can also be retuned to operate with channel 2 thru 6 IF inputs. The IF66 has its own input mixer stage and LO, which is AFC controlled and also has an LSI IF amplifier, 45 MHz SAW IF filter, and a separate 4.5 MHz sound IF system. Ceramic filters greatly simplify alignment and only a signal source, monitor, and VOM are necessary for setting up the IF66. Gain is over 63 dB (video out to IF input) and the necessary 1 to 10 millivolts input (-47 to -27 dBm) is compatible with a typical 30 to 40 dB gain tuner or downconverter, enabling excellent sensitivity and signal to noise ratio. AFC voltage as well as AGC voltages are available for use with various front ends and downconverters.

The IF66 operates from 11-14 V DC sources at about 180 ma. It is small (2.50"W X 4.00"L X 0.75"H) and provides an easy method of interfacing video RF systems to monitors and baseband systems.

This IF strip can be mounted in an NC1500 case with a downconverter to make up a completely self contained video receiver supplying baseband video and line level audio to drive a monotor, VCR, or other video device

By using this IF strip with a small LCD monitor, a downconverter, CCD camera and a transmitter such as our ATV12MK2, or other suitable model, a physically small 70, 33 or 23 cm ATV station can be constructed, since all units are each 2.50 x 4.00 inches in size and under an inch high, and can be stacked together. A battery pack, relay, and a few miscellaneous switches and jacks can be used as required to make a very compact portable ATV station. Also, UHF antennas are physically small and easy to carry. This makes portable operation from mountaintops or other sites very easy as an entire station can be only a few pounds in weight and can be installed in a small case as needed.

AVAILABLE EXTRAS:

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

April 4, 2006