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

[Richard Detweiler]

I'd bet the y connectory has a very small wire acting like a resistor which 
drops voltage and acts like a radiator.


73's
Rich
K5SF



>From: "Mike Hyder  -N4NT-" <mike_n4nt at charter.net>
>Reply-To: tentec at contesting.com
>To: <tentec at contesting.com>
>Subject: Re: [TenTec] Orion with 10m "buzz" (solved)
>Date: Mon, 28 Jun 2004 12:46:04 -0400
>
>That's a puzzlement indeed !
>
>73, Mike
>
>----- Original Message -----
>From: "Duane A Calvin" <ac5aa at juno.com>
>To: <tentec at contesting.com>
>Sent: Monday, June 28, 2004 11:45 AM
>Subject: Re: [TenTec] Orion with 10m "buzz" (solved)
>
>
> > 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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