|[AMRadio] Ranger II Problem ? Need Help..|
Rev. Don Sanders
innatehealing at bigplanet.com
Tue Apr 11 12:32:40 EDT 2006
The pot you reference is the setting for
the VFO keyer. If this changes it I would
first check the -56 volt bias circuit. The
filter caps are probably bad allowing
hum modulation fo the VFO.
I replaced the caps in mine and changed
the 6AL5 to solid state. If you haven't
changed the caps in the power supply
and modulator it would bear cosideration
as the caps are 50 years old.
----- Original Message -----
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, April 11, 2006 10:45 AM
Subject: Re: [AMRadio] Ranger II Problem ? Need Help..
> > don't know where to start looking. The problem is a very loud hum,
> > seems like 60 Hz, heard in my receiver, that comes from the
> > ranger.. The transmitter tunes up fine, and modulation is O.K. It
> > isn't there when the transmitter is zeroed into the receiver, just
> > when I remove the zero.. Completely wipes out the receiver..
> Hiya Mark!
> I would be curious as to the solution to this as well.
> I think this sounds a lot like the same problem I have with
> my Ranger. Try turning the VFO/xtal switch to one of the xtal
> positions. Does the hum go away? If so, it's the same problem
> I have. It's got something to do with the VFO (obviously!), in
> it's free-running state, perhaps? I know if I tweak the pot
> on the sub-chassis right next to the VFO compartment (I forgot
> what the pot is...I'm at work going from my faulty memory) the
> "hum" stops, but there is some other issue this causes and I can't
> what it is.
> I would really like to know what to do about it!!!
> 73 de Dan -- WA0JRD ..
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