[TowerTalk] SWR Problem Balun or lightning protection?

[Tony]

On 12/20/2011 7:51 PM, Pete Stark K4OM wrote:
> What is your power output?  Coax type?
> Try rig on dummy load.  Pete K4OM

Hello Pete,

The problem occurs with several different rigs when running 50 to 100 
watts. The coax is the Davis RF Bury Flex 400 equivalent -- it's only a 
few years old.

Tony


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> ----- Original Message ----- From: "Tony" <dxdx at optonline.net>
> To: <towertalk at 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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