NS-40 Class E Transmitter

Comments From David Swain, AB9EI, Oak Park, IL

Hi Terry,

The last time we talked I was requesting a printout of your ATS-3b labels. Thanks again. It gave a nice, finished look to the final result.

This time I’m writing to give some feedback on the NS-40 QRP Transmitter. What an innovative kit! The simplicity of it, from a kit-builder’s point of view, is simply brilliant. I discussed the NS-40 design with my weekly HF CATS (“Chatter and Talking Society”) net, and it seemed to arouse some interest.

I am getting about 9-10 watts out at 13.8VDC input, and find the transmit frequency with the 7.30 crystal to be about 7.28 (not a problem). It definitely runs cool, even at 9 watts out. I have inserted two SIP pin sockets in the board so that the crystals (7.30, 7.40, 7.128 – actual transmit frequency varies by about 20KHz) can be easily swapped. My first contact was with a western NC station. He gave me a 599 – not bad, considering I’m in the Chicago area! I think that this would be an especially rewarding build for a first time kit builder.

Please pass my compliments and thanks to David Cripe, NM0S and to the 4SQRP Group for all of the hard work that went into making this kit available.

73 de David AB9EI