Re HW-7 mods


From: Mike Czuhajewski (
Date: Thu Sep 15 1994 - 11:31:01 EDT

There was also an article in the QRP Quarterly in 1986 or 1987 by John
Collins, KN1H, titled Making the HW-7 a Real Radio, or something like
that. He rewired the MOSFET mixer into a VFO amp and installed a Mini
Circuits SBL-1 or SRA-1 doubly balanced mixer and added a FET preamp.
I tried this one myself; although the schematic and instructions were
confusing and hard to follow, it did work quite well. It cured many of
the problems that the stock receiver has. (And, with all due respect
to W1FB, this one did work; a few years ago two different people told
me they had tried the W1FB mod and for some reason it didn't work for
either of them.) Regardless of whether you try the KN1H mod or one
that was in QST, don't give up on the HW-7 receiver--it CAN be improved
and made more enjoyable to use. 73 and Queue Our Pea DE WA8MCQ

Mike Czuhajewski, user of the UniBoard System @
The WB3FFV Amateur Radio BBS - Located in Baltimore, Maryland USA
Supporting the Amateur Radio Hobby, and TCP/IP InterNetworking

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