[AMRadio] HR-10 problem


abeck at xplornet.com abeck at xplornet.com
Mon Apr 10 13:17:33 EDT 2006


You are right, I should be searhing around for some voltage out of spec.

73,

Alan



Quoting Brett gazdzinski <brett.gazdzinski at verizonbusiness.com>:

> Maybe the tube is out of bias, to much screen voltage, 
> or some resistor has changed value and the LO tube
> voltage is varying around?
> Maybe check things with the DMM?
>  
> Or maybe the bfo is changing, not the LO??
> 
> Brett
> N2DTS 
> 
> > -----Original Message-----
> > From: amradio-bounces at mailman.qth.net 
> > [mailto:amradio-bounces at mailman.qth.net] On Behalf Of 
> > abeck at xplornet.com
> > Sent: Monday, April 10, 2006 9:49 AM
> > To: AMRadio at mailman.qth.net
> > Subject: [AMRadio] HR-10 problem
> > 
> > Hi,
> > 
> > I am running an HR-10 RX in my shack outside and am wondering 
> > how to cure an 
> > annoying fault. Or, this may be bad design, but I don't 
> > remember this from when 
> > I was a kid.
> > 
> > When i turn up the RF Gain, and end up close to full on it, I 
> > get a shift down  
> > in frequency of the CW note. So far that I have to retune the 
> > BFO to get it 
> > back.
> > 
> > The RF Gain is in series with the Cathode of the first RF 
> > stage of the RX.
> > 
> > perhaps a Zener diode to cure it?
> > 
> > And if so, I guess I should measure the voltage someplace and 
> > clamp with a 
> > zener, but then again, I would be modifying the whole circut.
> > 
> > Anyone know how to fix this?
> > 
> > Best 73,
> > 
> > Alan
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