[AMRadio] RE: Receiver update.

[russ dworakowski]

Hey  Brett, consider looking at  a SP400 for  circuit ideas.  Did you  find 
a  12SA7?  If  not,  I  will send you  one,  email me.  Russ


>From: Brett Gazdzinski <brett.gazdzinski at wcom.com>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: [AMRadio] RE: Receiver update.
>Date: Tue, 05 Feb 2002 22:24:03 -0500
>
>Hello all AM'ers.
>My home brew receiver is coming along.
>I got the LO working well, the mixer works also,
>that surprised me!
>I built 3 stages of IF amplification, and did experiments
>with circuit values and component types.
>I had some sort of oscillation at times, caused by excessive
>plate voltage on the tubes and un-grounded IF transformer cans.
>
>I also tried the mechanical filter I have, and it seems to work
>well but is somewhat lossy...need to experiment a bit with that.
>
>A good spectrum analyzer has been incredibly helpful, and
>I am lucky to have a very good one through work.
>It enables me to see things, measure things, and makes a great
>frequency counter as well.
>
>I am working on the detector now, and may be able to actually
>listen to something soon.
>The RF amp is waiting for coil stock, so that will be a while,
>but the receiver picks up the signal generator
>turned all the way down and not hooked up to the receiver.
>
>I still have the agc, S meter, manual IF gain control,
>manual RF gain control, muting circuits, and the rf amp
>tuned circuits to do, but I am surprised its coming along
>as well as it is.
>
>Anyone got any good octal TUBE type detector circuits?
>I have one off the web, low distortion am detector,
>but it does not list the tube types.
>Its a diode (tube) followed by a triode amp, output
>taken off the cathode and the rf filtered out.
>
>Tonight, my Scott SLRM blew out its mixer tube filament
>while listening to 80 meters.
>Its been a long time since I blew a tube out in anything.
>
>Figures its one I don't have a spare for (12SA7)!
>
>
>Brett
>N2DTS
>
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