A Summer Project

Work has begun on a new "summer project" (as well as re-shingling the woodshed and garden shed roofs) ... a 3-tube audiodyne receiver.

This one appeared in the January 1933 addition of QST (Rationalizing the Audiodyne by George Grammer) and then in subsequent Handbooks for a few years. It's the type of building I like to do, with lots of pre-planning before breaking out the tools, measuring all components carefully and refurbishing some of the 85+ year old parts.

courtesy: arrl.org
This particular receiver has lots of metalworking involved as it uses two shielded compartments to keep the detector and RF stage from seeing each other. As well, it uses a set of ganged tuning capacitors to have the RF stage track the oscillator. The coils are wound to produce a lot of ham-band bandspread on the big drum dial... hot stuff in '33.

So far, I've completed all of the shielding and drilling of critical holes ... all measured three or four times before taking the plunge. The only chassis available (Hammond or Bud) is about 1/2" smaller in width and depth, making everything just a little snugger, but still maintaining proportions.

I have no idea how it will perform but so far it's been a fun project. If it works well, even better yet ... but handily, it's given me a good excuse to avoid more important things, like the two roof projects!
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

One Response to “A Summer Project”

  • w3fis, Paul Ross:

    Go to the Yahoo “Regenerative Receiver” group for some hints, help, insights, etc. Very useful stuff.

    73 /paul W3FIS

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