[TowerTalk] Issue with Tri-Band Yagi SWR

[Bob K6UJ]

If you haven't already I would disconnect the coax from the driven element connectors and hook up connect a portable SWR unit like the MFJ with a short coax jumper.
Run the swr profile across the bands and see whet you get.  This would rule out the coax.  You said your coax was quite old It could be the problem.

Bob
K6UJ



On Mar 12, 2012, at 7:16 PM, K3SK wrote:

> I'm have an SWR issue with my Wilson 4 element tri-band yagi.  I started
> with really bad SWR on 10 and 15 meters.  20 was better at ~2 to 1 across
> the phone segment.  So I took it down to isolate the problem.  I took all
> the traps apart and found no corrosion, arcing or other problems.  The traps
> are a double trap in a single housing very much like Mosley TA-33 series.
> Putting the antenna back together I found water in my balun so I replaced it
> with a new 5KW 1:1 from DX Engineering.  I reinstalled the antenna to the
> tower at 60'
> 
> On 20 meters everything is fine.  Good SWR and bandwidth.  15 meters SWR is
> 2.9 to 1 across the phone band.  10 meters is 1.5 to 1 and higher across the
> phone band.  Can bad feed line cause these indications?  My coax is quite
> old, but does not look bad from the outside.
> 
> Looking for any ideas or suggestions.
> 
> de K3SK
> 
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