Crystal Radios • Re: New-Open box Air Variable Trimmer advice...
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Seems the sale/auction has closed... Did you get what you wanted? chas
Statistics: Posted by Chas — Tue Mar 02, 2021 3:16 pm
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2 hours ago
I realize people use "regenerodyne" and ustify it by its design, but functionally this isn' very different from Frank Jones' "suoergainer" from about the same time. h
ReplyDeleteHe added a converter stage to a regen detector, simpler than a superhet but less finicky than a straight regen.
The difference is that the supergainer used a variable oscillator into the mixer, and the "IF" was fixed, and the "regenerodyne" used a fixed oscillator and the regen was variable.
I have never thought the difference warranted a name change. Frank Jones name describes how well it works, "regenerodyne" focuses on the regen detector, when both amount to simple superhets. It may make for simpler design by making the local oscillator fixed, but functionally both would have the same gain and other specs.
A direct conversion receiver with a converter ahead of it, a common design in the seventies, is considered a simple superhet, and can be made with a crystal oscillator into a variabke DC receiver, or with a variable oscillator and a fixed DC receiver.
Besides, a fixed regen can be imoroved by putting a crystal filter between the mixer and regen detector, allowing for single signal operation.