[Drake] Feed through on R4B

[Mike Hyder -N4NT-]

Years ago we used two Drake 4 lines (A & B) co-located at one shack.  If 
they were on the same sideband, then they interfered with each other on the 
IF frequency.  What we had to do was use one on the higher bands and the 
other on 40 or 80 meters.  Then we could use a Heath and not have 
interference with either Drake rig.

I tell you this because although I don't know why your rig did not mute 
completely, this IF interference may be the source of the anomaly you hear.

73, Mike N4NT

----- Original Message ----- 
From: "Darrel Nichols" <n0dbx at mindspring.com>
To: <drake at mailman.qth.net>
Sent: Monday, September 27, 2004 9:48 AM
Subject: RE: [Drake] Feed through on R4B


Mine's the A, but dirty relay contact, bad RCA connection or even the
sens & gain pots could all cause that.   At least the more simple causes...

N0DBX


> [Original Message]
> From: ed brooks <ed.brooks at att.net>
> To: <drake at mailman.qth.net>
> Date: 9/26/2004 9:46:24 PM
> Subject: [Drake] Feed through on R4B
>
> Time for me to dig out the manual.  But as I do so, I shall also pose
> the question here.  Someone might save me some time, and that would be
> neat.
>
> Noticed this evening when I was on 20 CW, that the R4B was hearing the
> T4XB CW signal even in mute.  Yes, the mute is working, but not muting
> all it should?  The signal heard is fairly strong, and is tuneable, so
> it means it is getting into the R4B somewhere after the front end, but
> not just in the audio chain.   I have noticed for some months a very
> weak audio (NOT the sidetone!) in the receiver when I was in Tune with
> the T4XB.  Not a problem in sideband or CW at the time.  This is the
> first time I've heard it so loud.  It does get much louder, though, if I
> put the RX in "ON" instead of "MUTE" as that kicks in the rx's front
> end.   Haven't tried it with this new development on sideband,
>
> Whoops!  Just tried it again and it is all working normally - full mute,
> no sound from the rx speaker.  A problem that has fixed itself.  Tried
> it in both separate and RX as control, and it works.  Also the very weak
> audio signal heard in the past is not present either.  Something
> intermittent.
>
> Any thoughts?
>
> Ed, W5HTW
>