If you were at the Dayton Hamvention in the early 80's you might have seen us walking around transmitting video back to our PC Electronics booth with it. Later we designed the all in one board 1W transmitter, KPA5, that were used at parades and races. The TXA5-70 board is two channel, but only 426.25 MHz is supplied. The $100 price includes USPS shipping in the USA.
The 10 pin jack matched the plugs used on the video cameras of the time, but we will include a matching plug if you want to make up an adaptor cable to RCA A/V phono jacks. Switches are Camera power, Transmitter on, Audio on and frequency. A coaxial jack is for 12-14VDC. BNC RF out jack on top. Can be connected through an attenuator to drive a higher powered amp like the PA5 below.
TXTVb 420-450 MHz Band ATV Exciter/Modulator Board......$15,
additional boards $10 - 3 left.
Make a low cost 70cm ATV transmitter or 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 - not supplied. 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 using a DC Voltmeter are included - download and see the data sheet by clicking on the board photo above. You can also build up a 25Wpep amplifier using the PA5 board and a RA30H4047M power module driven from the TXTVb board. Size is 4x2.25" - will fit in a Hammond 1590C or D die cast aluminum box - and takes 8 to 14Vdc at 40 mA.
If you have 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. Specify the transverter kit. We have a limited supply of crystals for 70cm ATV or 1265.0 (1268 MHz Transverter) or 1289.25 MHz (1296 MHz Transverter) and also check KH6HTV's surplus crystals on his current price list.
PA5 Linear Amplifier board... $15,
This 2.0x1.8" board allows you to switch the antenna between the transmitter and receiver as well as up to 1 Amp DC with another relay at the same time. The RF relay will switch up to 25 Watts at 70cm. The board comes with all parts soldered in as in the photo. While designed for the 420-450MHz band, we can modify them for use on other bands. Two of them can be used to switch an amplifier in or out. While the DC relay can only handle up to an Amp, most power modules final DC power can be left on and the bias voltage switched instead, or switch a higher current relay.
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...$1 each or 12 for $10.
2N5770 - data sheet - RF small signal TO-92 NPN Transistor used in our crystal controlled transmitters and downconverters
2N2907 - data sheet - TO-92 version of this popular small signal PNP transistor. Used in our sync separator circuits and
MM3725 - data sheet - Motorola TO39 NPN used as the video modulator and replaces 2N3734 and 2N3553 in our
MRF901 - data sheet - low noise - 2.0 dB - UHF preamp transistor, Motorola.............$5 ea., 12 in stock.
NE64535 - data sheet - Lower noise - .9 dB - NEC UHF preamp transistor.............$7 ea., 25 in stock.
NE25337 - data sheet - dual gate GaAsfet used in our thru hole downconverters.......$8 ea, 6 in stock.
MPN3404 - data sheet - TO-92 Silicon Pin Switching Diode, Motorola. Used for T/R switching in our
MC705K1CP Microprocessor programmed for 88-108 FM transmitter
oscillator driving MC145170 synthesizer IC..$3, all for $1 ea, 94 in stock, make offer.
BA1404 Stereo FM Modulator similar to NJR 2035D..$.50, all for $.30ea, 80 in stock, make offer.
Ceramic Trimmer Capacitor, tuning range 2-8 pF - Sprague GKU6R000 - data sheet.
Capacitors - disc ceramics, electolytics, etc.
Feed Through Capacitor - .001 mF.
Inductor / RF choke, .25 each or $20 per 100
Resistors - 1/4 watt carbon film, bags of 100 or 200 ....$1/100
100 Ohm Pot, Carbon, Panel Mount - Used in our transmitters for video gain control.
Crystals $5 ea: we have a variety of HC-25 plug in crystals used in our downconverters
Fuse - 1/2 Amp 3AG used on our downconverters...10 for $4, 100 for $30.
Njsh Type N Jack...$6
N plug to BNC jack adaptor Np/BNCj...$6
Double N Male Adaptor Np/Np...$6
N plug to F jack adaptor Np/Fj....$3
N female cable connector...$6
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