Hi Bernie,
I have built two DC receivers (one being the Neophyte that was in QST years
ago) and several regens (including one in Sept 2000 QST) over the years. The
tuning has been stable in all and I securely attach the tuning capacitor's
body that hold the rotor plates to the chassis.
Hope this helps.
73, Mike WA5POK
--------------------------------------------------
From: "Bernie KF0QS" <ham...@ix.netcom.com>
Sent: Wednesday, January 23, 2013 12:25 AM
To: <elecraft@mailman.qth.net>
Subject: [Elecraft] Question Regarding Direct Conversion Receiver
Dear Folks:
I have now built a K1 (#1024) and a K2 (#6922) and have deeply enjoyed
doing
both. I am now currently building the SSB option for the K2. They are
both
great rigs, and building them and getting them to work has been some of
the
best stuff I've done in my ham radio career. I've worked hundreds of
stations with them both, and a fair amount of DX.
Certainly, my confidence in doing my own work has grown by leaps and
bounds
because of the experience I've gained. I've even built one thing from
scratch, just using a schematic (a relatively simple circuit, but it
worked
perfectly the first time).
I now have a question about something I did years ago. When I got the K1,
I
decided to build something smaller first in order to practice soldering.
I
built a Vectronics (actually, from MFJ) direct conversion receiver for 20
meters (I also built the companion transmitter, and it works fine). The
problem is that merely touching the receiver makes its change frequency,
and
tuning it is an uncertain process. As a result, it is unstable, and not
much fun to operate (though it is reasonably sensitive despite its
simplicity). There must be some capacitance that it is getting from my
touch, that is adversely affecting its performance.
Did I do something wrong in building this receiver, or is it just the
price
of a really bare bones design?
Thanks for any advice anyone can give me.
73 de Bernie KF0QS
--
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