[TenTec] Orion with 10m "buzz" (solved)

[Duane A Calvin]

Thanks Mike.  Actually, the tuner connection is not the problem.  If I
pull the cable to the tuner from the "Y", the buzz continues.  It's being
induced (or augmented) by just having the "Y" cable in the power line to
the fan.  I plan to cut the cable apart to see how it's made after I
replace it.  

        73,  Duane


On Mon, 28 Jun 2004 10:45:12 -0400 "Mike Hyder  -N4NT-"
<mike_n4nt at charter.net> writes:
> Hi Duane--
> 
> You might want to add a little choke inside the tuner where the 12 V 
> lead
> enters, as well as a bypass cap if there isn't already one there.  
> If the
> fan is creating the buzz, then coupling it into the tuner may be the 
> source
> of your trouble and not the bad "Y" connector.
> 
> 73, Mike
> 
> ----- Original Message ----- 
> From: "Duane A Calvin" <ac5aa at juno.com>
> To: <tentec at contesting.com>
> Sent: Monday, June 28, 2004 10:06 AM
> Subject: [TenTec] Orion with 10m "buzz" (solved)
> 
> 
> > I was disheartened last week to find a "buzzing" noise in my 
> otherwise
> > perfect Orion starting in the 10m SSB frequencies and continuing 
> all the
> > way up the band.  Both RX's, happens with antennas connected or
> > disconnected or even deselected.  This weekend I started pulling 
> cables
> > to eliminate possible problem areas.  Imagine my surprise as I 
> pulled the
> > RCA plug out of the +13.8 V jack in the back and the buzz stopped! 
>  What
> > was it?  It appears to be a cheap "Y" cable that I used to power 
> both the
> > #310 cooling fan and the light in the 238B tuner.  If I plug just 
> the fan
> > without the "Y", no noise.  Same for the tuner.  If I plug just 
> the fan
> > through the Y cable, the noise returns, and is originating in the 
> fan
> > (noise follows the fan spin-up when power is applied, and stops
> > immediately when the power is removed.)  I plan to build my own 
> cable and
> > will probably add some bypassing there that is effective at 28 
> MHz.  Most
> > likely no one else will see this problem, but I wanted to post 
> this on
> > the off-chance that they do.
> >
> >         73,  Duane
> >
> >
> > Duane Calvin, AC5AA
> > Austin, Texas
> 
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Duane Calvin, AC5AA
Austin, Texas