On 12/20/2011 10:22 PM, Gene Fuller wrote:
> Hi Tony - Can you find out what's in the balun? Possibly a capacitor that is
> changing value as it heats up. Gene / W2LU
Hi Gene - it's an M2 3KW 1:1 balun. I'll give them a call tomorrow.
Thanks for the suggestion.
Tony
>
> ----- 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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