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Date: | Sat, 8 Feb 2014 23:32:24 -0600 |
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Mike,
In less I am missing something, I don't understand why you should have an S
W R of 30:1 through a length of coax. This would suggest there is something
wrong with the coax.
What type of coax are you using and how long is it?
If you were feeding a one half wave dipole which is suppose to be
approximately 50 ohms at the feed point, using this coax would have the same
30:1 S W R as you had with the 50 ohm dummy load. Just because you can tune
out the 30:1 S W R, doesn't mean there is an efficient transfer of R F from
the coax to the antenna at the feed point.
Unless there is something wrong with your dummy load, it looks like you
found the problem, replace the coax!
Howard #3
----- Original Message -----
From: "Mike Ryan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, February 08, 2014 10:02 PM
Subject: 75m issue
> Hi all:
>
> On the one hand I got my buddy researching my antenna to death and coming
> up with a theory that my antenna shouldn't have the Unun balun because
> it's
> not a 4/1 which is what I'm supposed to have.
> Tom assures me that the way I have my antenna set up is just fine and it's
> the coax. Tom suggested I place a dummy load at the end of my coax and I
> should have a flat or very low SWR. If it was high then it was definitely
> the coax. I did just that and the SWR was 30/1 but was able to be tuned to
> flat and held.
> My buddy put my tuner on his wire antenna with 1kw through it with no
> issues.
> Omg the trials. I don't know who to believe.
>
> 73:
> Mike VO1AX
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