> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Duane
> Sent: Thursday, January 22, 2004 5:12 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: BALUN
>
>
> OK, thanks for this info.  I just upgraded to General, bought a
> TS-2000, and
> put a an 80-meter loop.  The radio has a built in tuner and I want to see
> what it can do, but it only works with a coax connection.  I have
> a BAD RFI
> problem!  I can't put out more than 25W or my audio is really distorted.
> Right now I'm externally tuning with a MFJ 949D transmatch. SOmeone
> suggested that the problem MIGHT be with the MFJ.

Not likely, but...

Do you have a GOOD RF ground connection to the Tuner?
(Short, Low resistance, Low inductance connection to mother earth!)

Take the RF OUT of the shack with a piece of coax From the tuner to
the feedline at least 15 feet from the dwelling.  Skip the balun for
now, just connect the ladder line to the coax OUTSIDE the dewlling!

Unless you are measuring the feedpoint with an antenna analyzer of some sort
it makes no sense to add a balun.  I hope I made that point.

You can choke off some of the common mode currents by coiling some coax up
at the
connection to the ladder line.  This may be enough to stop your RFI.

>
> Thanks,
> Duane
> KD5NFQ
>

  *
  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.NET
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41, PL 74.4

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

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