On 12/23/2011 1:34 PM, Billy Cox wrote:
> Hi Tony,
>
> Two ideas ... one, have you seen
> the same behavior<the changing
> SWR> on another wattmeter?
Hi Billy,
Yes, I have an external wattmeter - same results
> I saw mention of three rigs, but
> does the internal metering on all
> of them show the same behavior as
> the external wattmeter?
Yes
> Finally, you mention that the two
> yagis are switched via the same
> remote switch?
Yes, they are, but the problem happens when the all switched and jumpers
are bypassed i.e, the rigs connected directly to the coax cables feeding
the antenna.
> Then I would start
> to suspect the main coax that goes
> to the switch. What other antennas
> are on this switch? Any changes in
> their behavior as to SWR/etc?
The jumper and remote switch are not the problem.
>
> Hope this helps!
>
> MC es HNY!
>
> 73 de Billy, AA4NU
Thanks Billy, Merry Christmas to you and yours.
Tony, K2MO
>
> -----Original Message-----
>> From: Tony<dxdx@optonline.net>
>> Sent: Dec 23, 2011 6:28 PM
>> To: towertalk@contesting.com
>> Subject: Re: [TowerTalk] SWR Problem Balun or lightning protection?
>>
>> 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
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>>
>> _______________________________________________
>>
>>
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