[Milsurplus] [ARC5] ARR-15 selectivity

[Hubert Miller]

I like the 1 kHz dial readout with the variable IF. The Eddystone 830 series use a variable first IF to get the same accuracy  but in that case,
there's a second conversion to give selectivity. I think the "regenerative IF" thing is a pile of beans, as anyone who has ever used a Knight
or Hallicrafters receiver with that. Ditto following the variable IF on the ARC-2 with a Q5er. I am sort of thinking "a" method is to use a
2 terminal negative resistance stage connected right at the IF tuned circuit. 'Amateur Radio Techniques' by Pat Hawker many years ago
introduced that idea. BUT - you do have to find a space for a pot to control it - and that may be a problem - unless you maybe use an
outboard box.
-Hue Miller
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