The Ten Tec m Transceiver

Have a ball building this great little $200 rig,

Jeff Gold AC4HF 1751 Dry Creek Road Cookeville TN 38501

This time Tin really excited! With all the new no-code Techs, the most common ham buy these days is a 2 meter transceiver Since I have always enjoyed operating radios that I have built myself, the fen-Tec T-Kit #1220 looked I ike just the ticket. Besides, while building, I am also learning how the equipment works, so I'm more likely to be able to repair it.

Ten-Tec is lilting the void Heathkit left when they quit. Iky obviously put a lot of work into designing a microprocessor-control led 2 meter rig that can he assembled, adjusted and maintained by hams with average building and soldering skills.

The rig has front-panel tuning in 5 kHz or 2.5 kHz, steps. There is a six-digil sunlight-filtered LED frequency display and 15 programmable memories. There is also provision for five non-standard offsets and a built-in CTCSS tone generator. The transmit-receive switching is done with diodes. The rig uses a standard five-pin DIN packet connector and circuitry. There is a built-in speaker, as that everything that >ou have done before has checked out and \ou ha^e only one small section to check lor the problem. I was very careful, hut when I finished the receiver and audio section, it didn't work, I found I had put a wrong value resistor in two places, I enjoyed their approach since I didn't have to wait until I finished ihe whole project to know that the sections were working.

The first section you build is the display driver and microprocessor circuits. When you are done, you get to see it light up. Next, you build the voltage-controlled oscillator (VCO) and phase-locked loop (MX) circuits. Then you align lhe VCO using a standard voltmeter to adjust a lest point for a given voltage. Then you need only check for a voltage change as you tune from one end of the band to the other There is an optional test if you have some way of generating a 10.7 MHz signal to verify Lhe receiver operation. The third section is the FM receiver and audio section, where you get to hook up the speaker and test the audio and squelch.

Amateur Transceiver Kit

W hen you are doney this unit looks like q small commercial mobile rigt not like a kit you have built. "

wel l as an external speaker jack. You can switch between two power levels from the front panel. Without the optional 1222 amplifier kit you will get about I or 5 watts, and with the amplifier, it's 5 or 30 watts,

Ten-Tec has you build the rig in stages. After you finish each stage you test and align it. They provide a blow-up of the part of the circuit you are working on w ith a schematic for that one section. Thus, if you do make an error, you know 56 73 Amateur Radio Today • August 1996

Next you build the receiver KF amplifier and mixer. Then you adjust several coils for maximum voltage and one transformer for best voice quality. You now have a working receiver, so \ou can start iislening to the local repeaters. The memories are now functional, as are ihe repeater offsets.

The fifth section has you building the transmit audio, push-to-talk (PTT) and frequency modulation of the VCO. When you complete this you can transmit, Boy, is that a good feeling! Now you are close to having a working transceiver,

Next you build the CTCSS tone and packet circuits; Lhere arc no alignments or tests for this section. You proceed to the transmit RF section and then to the final assembly and testing. At this point, you can either choose to have an op-erationaf 5 watt transceiver or add the optional amplifier. Either way, Ten-Tec suggests that you test oul lhe transceiver at the lower power before installing the amplifier. If you know you are going to install the amplifier, you'll need to substitute two heavier duty diodes while building lhe main uniL This will save some desoldering later.

I tuned the rig to one of the local 2 meter repeaters and gave a coll. The chap who came back to me reported that the rig had a good natural-sounding voice quality and I w as into the repeater full quieting, even with the rig on the I watt power selling. He reported no difference in either the audio or my signal quality on low power I slill get excited whert a new piecc of gear Fve buiii works right.

The kit

This is a high quality kit in every way. The printed circuit board is plated through, solder-masked, and nicely si Ik-screened. The plated-thruugh part really helps in making the connections sturdier so (hat the assembled rig lasts longer

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