[Amps] High SWR

[jmltinc at aol.com]

Garry,

I am not sure if you said if your antenna was an HF or not; nor whether it was a multiband or not.

Please don't confuse a W2DU bead balun (sometimes refered as a sleeve as the beads slip over the ouside of the coax) with a true sleeve balun, which?is 1/4 wl metal conductor coaxially placed over the coax itself, and connected to the braid at the 1/4 wl from the feed point (antenna).

An HF sleeve for a rotary beam is mechanically challenging. They are usually used for 2 meters and above.??They are useful only at odd multiples of 1/4 wl.

For HF, a bead balun or a choke balun of several wraps (depending on lowest frequency) of coax into a coil would be best.

-John, N9RF



-----Original Message-----
From: Gary Smith <wa6fgi at sbcglobal.net>
To: amps at contesting.com
Sent: Sat, 25 Apr 2009 10:50 am
Subject: Re: [Amps] High SWR



To the group:

A giant thank you to all who nswerd my question. Now I have to do some reaserch 
on sleeve baluns as I am not (at all) familiari with them.

Again my thansk to a wonderfu group of indivuduals who are armed with a cache of  
fantastic (and well appreciated) knwolegde.

73,
Gary...wa6fgi
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