Hi Tony -
Can you find out what's in the balun? Possibly a capacitor that is changing
value as it heats up.
Gene / W2LU
----- Original Message -----
From: "Tony" <dxdx@optonline.net>
To: <towertalk@contesting.com>
Sent: Tuesday, December 20, 2011 7:41 PM
Subject: [TowerTalk] SWR Problem Balun or lightning protection?
> All,
>
> The SWR on my 5 element mono band Yagi rises after I key down for a few
> minutes. The 2:1 SWR bandwidth behaves normally until the problem
> occurs. The SWR goes to normal after waiting a few minutes, but then the
> problem starts again after I key down for a while.
>
> The only things inline are the lightning protection (polyphaser) and the
> balun which is mounted at the antenna. The antenna is made by M2 and it
> uses an M2 balun.
>
> I'm going to bypass the lightning protection tomorrow as a process of
> elimination, but I was wondering if the problem is more likely to be
> caused by the balun?
>
> Thanks,
>
> Tony
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