Jim
Show me the ACTUAL antenna range pattern measurement data with and
without the common mode choke on a a similar antenna, with a reasonable
SWR ( LESS THAN 1.5:1) and the feed line has been brought down
perpendicular to the plane of the antenna and I will concede you the point
Dave
NR1DX
On 11/6/2020 3:37 PM, Jim Brown wrote:
On 11/6/2020 12:28 PM, Artek Manuals wrote:
The short answer is how tight you make the turns will have little
real world effect.
That short answer is WRONG.
Use the RG-8X I would probably use the #31 core over the
43 . The poor mans 8 turns of coax 4-5" in diameter without ferrites
will probably actually work as well.
Define "work." The important thing a choke should do is kill common
mode current on the feedline that couples noise to the antenna and
fills in nulls in the antenna's pattern. That "poor man's" solution
won't do much for that. If "work" means it won't overheat, yes, it
would "work."
Depending on SWR and feed line dressing (always perpendicular to the
plane of the beam the need for choke at all� is arguable
It's arguable only if you don't understand the problem, or don't care
about noise or the antenna's nulls.
73, Jim K9YC
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