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Re: [TowerTalk] SWR Problem Balun or lightning protection?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] SWR Problem Balun or lightning protection?
From: Tony <dxdx@optonline.net>
Date: Fri, 23 Dec 2011 13:28:43 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 12/23/2011 11:01 AM, K1TTT wrote:
> Then the first thing to do it to figure out what is common between the two
> of them.... do they share a feedline to a remote switch?  Or is switching
> done in the shack?  Have you tried the swr meter on a dummy load to see if
> it is ok?

Hi Steve, it happens when RF is feed directly from rig to coax to 
antenna without anything inline. There are two separate feed lines 
feeding each antenna so I normally use a remote switch. I don't have a 
dummy load on hand, but I get the same results with 3 different rigs.

Thanks,

Tony, K2MO

>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>
>
> -----Original Message-----
> From: K7LXC@aol.com [mailto:K7LXC@aol.com]
> Sent: Friday, December 23, 2011 15:52
> To: towertalk@contesting.com; dxdx@optonline.net
> Subject: Re: [TowerTalk] SWR Problem Balun or lightning protection?
>
>
>>   This has become a real mystery folks. I checked the SWR on  my 3
>> element
> Steppir today and found that it behaved the SAME as my 5  element 20M mono
> band Yagi, i.e., the SWR increases after keying down for a  few minutes and
> returns to normal after waiting a few seconds. This happened with all bands
> on the SteppIR. The antennas are mounted on the same tower about 12ft apart
> so I always retract the Steppir elements when using the 20M mono bander to
> avoid interaction.
>
>      The first thing you should do is to measure the swr  with an antenna
> analyzer at the antenna feedpoint. Everything else is just  complicating
> your problem. Then work your way back to find where the culprit is.  With 2
> antennas exhibiting similar problems, it probably isn't the antenna  that's
> the problem.
>
>      MOST "antenna" problems I've ever encountered were  something other than
> the antenna; e.g. bad jumper, bad switch, bad meter, etc.  The problems were
> cured  in the shack but the diagnosis started at the  feedpoint.
>
> Cheers,
> Steve     K7LXC
> TOWER TECH -
> Professional tower services for hams
> _______________________________________________
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>
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