[Hallicrafters] SX-110 crystal filter

[Glen Zook]

The old Heathkit QF-1 "Q-multiplier" was used on a lot
of Hallicrafters S-85 and SX-99 units during the 1950s
and well into the 1960s.  The SX-110 is nothing more
than a "reboxed" SX-99.

I had a QF-1 on my original S-85 and it worked great. 
There was a modification in the ARRL Hints & Kinks
books back during the late 1950s and early 1960s that
changed the "broad" tuning range of the QF-1 into a
variable bandpass filter.  I did that on my QF-1 and
that really added to its usefulness.

Glen, K9STH


--- John Brooks <jbbrooks2000 at yahoo.com> wrote:

Maybe an outboard Q-multiplier?

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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