TX33-1b 913.25 MHz 1W AM ATV Transmitter... $180

This transmitter was used in our milk crate ATV repeater for public service work. But due to local interferance from other services, we switched our system over to the 23cm band. So this transmitter is available. It gave good video and audio over a 6 mile path between aid stations at a trail race and using half (3 ft boom) of a Directive Systems 3318LYARM Loop Yagi at both ends line of sight.
If you wish to change the frequency, you can order a crystal from International Crystal - Fxtal = Fo/8 and their catalog number is #473370

GVM-1 Gunnplexer Video Modulator Board....$29

    This is a board that has many other uses:
        Video amp for satellite receivers
        Video distribution amp
        Sound subcarrier mixer
        Pre-emphasis or de-emphasis amp
            Download the NEW app note

    Gunnplexers make a great little microwave (10.4 gHz) ATV link or way to demo ATV and how directional antennas work, bouncing off metal objects, multipath, etc., in a more interesting visual way at ham clubs or ham class rooms.
    See the gunnplexer application note - A 10 gHz ATV system is easy to put together. Gunnplexers are available from SHF Microwave and Advanced Receiver Research. Choose those that have varicap tuning diodes in them - the GVM-1 modulator board connects to the varicap to DC bias and FM modulate the Gunn diode in the Gunnplexer.
    Analog satellite TV receivers don't output enough video when used on the 900 and 1200 MHz ATV bands with 4 MHz deviation. This board can boost the level up to the 1 Vp-p standard with an adjustable gain up to 5.
    Tapping into a video line without loading it down to drive a 2nd monitor, VCR, transmitter, etc., is another application of this board.
    This board can also be used as a video and sound Mixer. Add sound with our FMA5-G board or FM pre-emphasis to video only ATV transmitters. The pre-emphasis can be removed for AM transmitters. The video amp has variable gain up to 5 which can better set up or equalize the video level in some transmitters - 75 Ohm input and output.
    Modified for the ham bands wireless video transmitters and receivers can double the DX by adding pre-emphasis and de-emphasis to the video which lowers the noise bandwidth.

• • The boards are $29 if ordered individually, but for ham club or group projects, you can have them for $25 each if you buy 2 or more. 30 left.

Directive Systems 1245LY 2.4 gHz 20 dBi Gain Loop Yagi Antenna......$60

High gain, center mounted loop yagi covers 2.35 to 2.45 gHz. 45 elements, 81" boom, 50 Ohm N jack. Comes partially assembled, just attach the 2 boom pieces together and mast mounting plate, H or V - use all or half. Click on the model number above for the data sheet.

TXTVb ATV Exciter/Modulator Board...$29

Great club or group project!
Transmit ATV over short distances.
Partially assembled board and selected parts kit - click on photo at right for full details.
Only..$29, 2 for $49, 5 for $99
Fully assembled and tested add $20 per board.
As seen on page 39 in the Winter 2006 ATVQ.

Make a low cost 70cm ATV RF Test Generator for tuning up receivers or antennas. Demonstrate ATV at a ham club, Scout Jamboree, Field Day, etc., with this unit - transmit in the building to a cable ready TV set. This board puts out about 10 mW and uses the same crystals as found in all our 420-450 MHz ATV transmitters - standard 70cm frequencies available from us. The board comes partially built (as shown in the photo) and with all 12 of the additional parts as a kit to complete the board. Assembly and tune up instructions are included - download and see the data sheet by clicking on the board photo above.

Or, by using a different crystal and additional parts kit, you can drive a 2 meter in / higher band out Transverter like those available from Downeast Microwave, SSB and others, you can add the AM ATV mode with this board. The boards are stuffed and soldered with the exception of the inductors, parallel capacitors and 3 2N5770 transistors which we will include as a kit (specify 2 M or 70cm) with each board for use on 70cm with 10 mW or 2 meters to drive a transverter with 50-100 mW. 70cm crystals are $25 and use the same ones as found in all our transmitters. We have a limited supply of crystals for ATV on 1265.0 (1268 MHz Transverter) or 1289.25 MHz (1296 MHz Transverter) at $5, or you supply the crystal (order from ICM catalog #473370 - 2 meter F/2 and HC-50 holder) for the frequency you want to end up with after mixed in your Transverter. We made a bunch of these in 1995 for use in our TVX series of export TV transmitters for channels 3 to 13. But not much later Amprex and Philips stopped making the companion 10 watt power modules and no similar power modules are available - that ended that product line. Size is 4x2.25" - will fit in a Hammond 1590C or D die cast aluminum box - and takes 8 to 14Vdc at 40 mA. Use the FMA5-G for sound.

Power Modules

BGY-32 (1 in stock), Philips..................$70
    25 mW in 18W out 68-88 MHz.
    Used in our TVX ch3-6 export TV transmitters
        includes TC PA bare board.

We have an excess of through hole parts that were purchased in large quantities before we started using surface mount parts:

2N5770 small signal TO-92 NPN RF Transistor used in our crystal controlled transmitters and downconverters for the oscillator and multiplier stages. Up to 50 mw at 400 MHz.
5 for $1, bag of 100 for $10 or box of 2000 for $150. 4500 in stock.

Motorola MRF901 low noise UHF preamp transistor.............$5 ea., 23 in stock.
Lower noise NEC NE64535 UHF preamp transistor.............$7 ea., 28 in stock.
NE25139 dual gate GaAsfet used in our surface mount downconverters....$10 ea, 13 in stock.
NE25337 dual gate GaAsfet used in our thru hole downconverters.......$8 ea, 44 in stock.
MRF966 Motorola dual gate GaAsfet used in early thru hole downconv....$3 ea, 25 in stock.
MM3734 Motorola TO-39 NPN used as the modulator in older TX......$7ea., 200 in stock.

Philips BLU98 RF transistor used in our TVG test generators, TXA5-33 and TXA5-23 transmitter multiplier stages. Capable of up to1/4 watt output on 23cm. Similar to Motorola MRF581. $2 ea - 100 in stock.

2N/PN2907A small signal TO-92 PNP transistor. Used in our sync separator circuits and other products. Great general purpose PNP.
10 for $1, bag of 100 for $8, 1000 for $60. 2500 available.

IC's - DIP integrated circuits.
        Click on IC's above or photo for the list of part numbers
        and quantity available

2-8 pF ceramic trimmer cap - Sprague GKU6R000.
        RF peaking cap (red top) used in our transmitters and downconverters.
        10 for $10, 100 for $70. 1000 for $500. 3000 in stock.

Capacitors - disc ceramics, electolytics, etc.
        Click on Capacitors above or photo for the list of values
        and number available

Inductor / RF choke, .25 each or $20 per 100
1 uH (500 in stock), 4.7 uH (100 in stock), 10 uH (125 in stock) & 33 uH (400 in stock).

Resistors - leaded 1/4 watt carbon film, bags of 100 or 200 ....$1/100
        Click on Resistors above for list of values
        and number of bags available

Trim Pots - Thumbwheel carbon trim pots, Piher type PT15YB
        and Stackpole equivalent.
        $.25 each or $15 per 100 of one value.
        Click on Trim Pots above or photo for list of values and quantities available

Crystals $5 ea: we have a variety of HC-25 plug in crystals used in our downconverters
        and transmitters before we switched over to synthesizers. Click on Crystals to see
        the list of frequencies, quantities on hand and what they were used for.

Bias-T Parts Kit............$15

Power your Antenna mounted preamp on the 400, 900 or 1200 MHz band through the coax with this bias T. Great for powering Downeast 23LNAWPQ or 33LNAWPQ antenna mounted preamp from the ham shack. Insertion loss was measured at less than 1 dB. Kit contains LMB cad plated - solderable - metal box with lid, 2 BNC chassis jacks, feedthru cap, 100 Ohm 1/4W resistor,.22 uH inductor and data sheet.
Additonal 2x2x.88" cad plated metal can with lid, great for small projects...$2 each or 8 for $10.