http://elecraft.85.s1.nabble.com/High-SWR-on-20-and-40-tp4401077p4402350.html
>
> And re: your follow up - all the testing was done with the KAT2. I have
> never disconnected it.
>
>
>
>
>
> Don Wilhelm-4 wrote:
>
>> Dave,
>>
>> Is that a 1:1 balun or a 4:1 balun. Usually a 1:1 works better, but
>> whichever balun you are using, try the other one and see what happens.
>> Do you have an antenna analyzer? or can you borrow one? If so, what is
>> the impedance at the end of the coax? Both the resistive and reactive
>> components please - just the SWR does not provide much information on
>> how to advise you to proceed.
>>
>> You may be better off eliminating the coax entirely and running the
>> window line all the way into the shack.
>> 73,
>> Don W3FPR
>>
>> djmd wrote:
>>
>>> Hello,
>>>
>>> I have been trying to troubleshoot my antenna system, and have been
>>> trying
>>> to avoid the dreaded "high swr" post, but I've run out of ideas, so I'm
>>> turning here.
>>>
>>> First let me explain my system. 67' dipole fed by 16' of window line.
>>> That's
>>> connected to an Elecraft balun. From the balun, there's a short piece of
>>> coax going to a barrel and into the basement (through a piece of cement
>>> backerboard. From inside the basement, there is another piece of coax,
>>> about
>>> 12', connected to the barrel, and going up into the bedroom directly to a
>>> K2
>>> with an autotuner.
>>>
>>> Before the K2, I was using a Yaesu FT840 with an MFJ tuner. After
>>> tweaking
>>> the window line length and the actual length of the dipole, I never
>>> really
>>> had a problem with SWR (well, according to what the MFJ was saying, which
>>> may or may not be totally accurate.) Usually 1.5:1 or under on all bands.
>>>
>>> With the K2/KAT2 in place, the SWR reported by the tuner is all over the
>>> place. The only one that gets less than 1.5:1 is 30m. Most bands are
>>> pretty
>>> random, anywhere from 3:1 to 7:1. However, on 20 and 40, it generally
>>> does
>>> not get below 9.9:1.
>>>
>>> I've tried 4 different lengths of coax between the barrel (inside) and
>>> the
>>> rig... 3', 6', 12' 20'. I've tried a couple different lengths between the
>>> balun and the barrel on the outside.
>>>
>>> When I attach the balun directly to the K2 I get <1.3:1 on all bands
>>> (most
>>> are 1:1.) With a short piece of coax between the rig and the balun, I get
>>> the same results. I've also attached my dummy load to the barrel on the
>>> outside of the house, and tested it from the shack, and I saw 1:1 no
>>> problem.
>>>
>>> I totally understand the concept that if "A" works and "B" works, "A+B"
>>> doesn't necessarily work. I understand it's a whole system. But I've
>>> tried
>>> so many different combinations of coax on each side, and don't understand
>>> why my SWR is basically infinity:1 on 20 and 40, when they seemed to
>>> match
>>> reasonably with the old system. I have not tried different lengths of
>>> window
>>> line between the dipole due to the fact that I had it perfectly trimmed
>>> for
>>> my old system. But I have plenty of it and would be open to trying
>>> anything.
>>>
>>> Just trying to get the most I can out of my modest 10W. :) Any
>>> suggestions
>>> would be appreciated!
>>>
>>> 73,
>>>
>>> Dave
>>> K8DJW
>>>
>>>
>>>
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