I asked my XYL to press the key and watch the SWR meter, and to let go
when it hit 3:1. Then she ran out and waved to me on the roof, at which
point I went up the ladder and felt the bolts. Very high tech.
If I'm right that it's the bolt material, just changing to brass bolts
should work.
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
On 14 Jan 2016 20:14, [email protected] wrote:
Nice work Vic! Let us know how you determined the stainless screws to
be heating? Do you have an IR sensing gun with a tight pattern?
Also be curious to hear how you plan to change the connection method and
if successful? All I can think of is a stainless hose clamp.
73, Mike AC5P
On Thursday, January 14, 2016 11:40 AM, Vic Rosenthal 4X6GP/K2VCO
<[email protected]> wrote:
I would like to thank the numerous hams who responded to my plea for help.
The problem that was causing my SWR to rise with high power was not in
my shack. The tuner, balun, coax and open wire line were all 100%. The
trouble was at the connection of the feedline to the antenna.
The connection was made where stainless steel bolts passed through the
tubing. The bolts heated up rapidly when running over 500w. At first I
thought the connection was poor, but improving it did not help. From the
way it was heating (away from the point of contact of the lugs to the
antenna tubing) I think that it was due to the ferrous material
(stainless steel) of the bolts heating due to eddy currents in the
strong RF field.
I have experienced this phenomenon in amplifiers, but never an antenna!
I will change the method of connecting the line on Sunday and I hope it
will solve the problem.
--
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
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