A & A Engineering
K9AY QRP Morse Code CW Radio Kit

About 20 years ago I bought this K9AY - A and A Engineering QRP transceiver as a kit from an article in QST Amateur Radio Magazine. Mine didn't receive after I finished building it 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! 

My K9AY QRP Radio is the 20 meter version although A & A Engineering sold 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.

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.

As you can see in the photograph above, I have been doing my share of radio 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.

But I think I know why you're here. You're looking for the documentation for the one you bought at a Hamfest? Am I right? I have available in PDF format the original K9AY QRP Radio assembly manual from A & A Engineering, some additional documentation from A & A and the pages from the 2 issues of QST magazine. Ok, Download the PDF File.