10-GHz Transceiver and CW Interface Idea

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     I posted a few weeks ago about my plans to use some inexpensive Doppler motion sensors as 10-GHz transmitters. At the time, I wasn't entirely sure on how I would transmit with it. To do so with this module, you modulate the input voltage and can use an audio input device such as a computer, MP3 player or something similar.

     Surfing around a Facebook group a few nights ago led me to find the Four State QRP Group. On their site, I saw a Super Simple Code Practice Oscillator. It has audio output to a small speaker and a rudimentary key built onto the circuit board. Eureka---this gave me an idea.

     The SSCPO will lose its speaker and I'll replace it with a 3.5mm audio jack for output and forgo the key switch and install a connector for an external straight key or keyer. With this setup, I can use the audio output to connect to my HB100 transmitter to provide the required modulation. As a bonus, I can also use it with my Radio Shack HTX-10 transceiver which has no built-in CW function. The HTX-10 provides the IF signal for my 1.25 MHz transverter.

A front and back picture of an HB100 Doppler motion sensor


Here's a picture of the unassembled kit



Here's what the finished product looks like (Image copyright 4sqrp.com)

If you'd like to find our more about the SSCPO or order one for yourself, please visit http://www.4sqrp.com/sscpo.php

73 DE WA5RR

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