[ARC5] FW: Way OT -- SX-28

[Hubert Miller]

Don't do this. It's only a parlor trick and you'll never be satisfied with the result.
If you want to use regeneration, use a Q multiplier.
Regenerative IF stages are crap, as numerous reviewers of the SX-140, Knight Kit Star
Roamer, and so on have commented. 
-Hue Miller

>Copied the following online.
>Richard kn7sfz
>Adding feedback to a 2nd IF stage to improve selectivity was sometimes 
used with the surplus "ARC-5" (vacuum tube) receivers in the 1950's and 
1960's. One such approach was described in QST magazine (March 1960) by 
Lewis McCoy W1ICP "A Poor Man's Q Multiplier", available to ARRL members 
at arrl.org in the QST archives. McCoy indicated this improved 
selectivity considerably in the ARC-5 BC-454 (3-6 mhz tuning range; 1415 
khz IF) and ARC-5 BC-455 (6-9.1 mhz tuning range; 2830 khz IF).