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A & A Engineering/K9AY QRP Kit Radio
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QRP Ham Radio Transceiver Kits - Ham Radio Parts Many years ago I bought this QRP transceiver as a kit from an article in QST. It didn't receive right off that bat and that's because of a few poor solder joints. I stuck it in the closet where it resided for about 10 years. Around 1999 I began my interest again in QRP radios. So I dug this little radio out of the closet, found my original soldering mistakes and Wa La! This is a really great radio! Mine is the 20 meter version although A & A Engineering made a 40 and a 30 meter version also. It tunes about 60 KHz of the CW portion of the band by means of a varactor diode tuned VFO. The heart of this radio is the Motorola MSC3362P, a FM receiver on a chip. This part is impossible to find through the regular sources. However, Ditz at Kits and Parts dot com might have them for a very reasonable price. Ditz is also the Grand Poopaw of the Flying Pigs QRP Club.
As you can see in the photograph above, I have been doing my share of modifications. Mods were adding a TiCK Keyer available from Kanga, and a Freq Mite available from Small Wonder Labs. I also have ready to install a resistive SWR bridge driving an LED. Just tune for minimum glow on the LED. I have available in PDF format the original assembly manual from A & A Engineering, some additional documentation from A & A and the pages from the 2 issues of QST magazine. The file is rather large so an email account that can handle such size files will be required. I don't require you pay for this documentation but it does take time away from my business and it does costs money to maintain a web site. However, otherwise, it might take a few days for me to get around to the request. Paypal Contributions go to support my addiction to the smell of melted solder. I can be emailed at: jerry @ kd5om dot com Does your online business accept Credit Cards? It's easy and safe through PayPal. Click on the button below to start receiving Online Payments:
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The receiver is a superhet with a lattice crystal filter, AGC, S-meter
(mine died) and enough audio power to drive a 4 inch speaker on top of the
rig. The large knob is the main tuning and there is a smaller knob to the
right that is the fine tuning. I wish it had an RIT. Maybe that will be a
future modification. The transmitter has a very clean CW note with about 4
watts output. The transmitter uses a mechanical T-R relay with adjustable
delay. Here I wish it had used a solid state T-R switch like found in the
SW-40+. Maybe another future modification.