Parts - Prices reduced on some items.
2N5770 - data sheet - RF small signal TO-92 NPN Transistor used in our crystal controlled transmitters and downconverters
for the oscillator and multiplier stages. Up to 50 mw at 400 MHz. Also a good general purpose NPN transistor,
for analog and digital applications, similar to 2N918, 2N2222 and 2N3904.
5 for $1, bag of 100 for $10 or box of 2000 for $150. 4000 in stock, make offer for some or for all.
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.
NE25339 - data sheet - SOT-143 surface mount dual gate GaAsfet used in our downconverters.......$8, 10 in stock.
100 Ohm Pot, Carbon, Panel Mount - Used in our transmitters for video gain control.
Ceramic Trimmer Capacitor, tuning range 2-8 pF - Sprague GKU6R000 - data sheet.
Feed Through Capacitor - .001 mF.
Capacitors - disc ceramics, electolytics, etc.
Inductor / RF choke, .25 each or $20 per 100
Resistors - 1/4 watt carbon film, bags of 100 or 200 ....$1/100
Crystals $5 ea: we have a variety of HC-25 plug in crystals used in our downconverters
Fuse Holder - chassis mount, for 3AG size fuses. 2 for $1IC's - DIP integrated circuits.
MC2833p Low Power FM transmitter system IC - data sheet .....$3, 5 in stock
MC145151p2 Synthesizer PLL IC - data sheet - Motorola..$5ea...13 in stock.
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.
This 2.0x1.8" board allows you to switch the 50 Ohm antenna between any transmitter up to 500 MHz and 25 watts and a receiver. While designed for T/R switching in the 420-450MHz band, we can modify them for use on other bands up to 23cm. Two of them can be used to switch an amplifier in or out. There is also a relay that was used to switch the camera video from the video monitor output to the detected video out. In addition there is another relay that is used to switch the DC between the receiver and transmitter. 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 the video relay can be wired in paralled for up to 3 Amps (6A using both RF in and RF out TR-1b boards. The board comes with all parts soldered in as in the photo.
TXTVb 420-450 MHz Band ATV Exciter/Modulator Board......$20,
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. 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 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.
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.
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.
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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