Re: [IRCA] Chokes for Coax Lead-In

[Patrick Martin]

John,

Welcome back on the list. Thanks to you, I have solved the issue. I
remember reading your article several years back, but I never thought it
make be such an difference, I was thinking as many,  that the coax is
shielded and a matching transformer is inline, so why would the coax be
an issue? I found out very quickly after first terminating  the
"pigtails" I had and hearing CBU-690 just using the coax at S9!! I was
shocked to say the least. Well, getting rid of the pigtails and going
back to the F fittings knocked the signal of CBU to threshold, but the
locals were still at S7-S9, but boy did the choke make the difference.
That little easily made unit can do so much. I now get the locals at S1
or less!  Having a choke on the antenna input of the R8 is where they
will stay. The old adage comes into play "If I knew then what I know
now" sort of thing. But being on the rural OR coast having no strong
locals and DX rolls in, I fiqured why bother? well, I did bother and I
am glad I did.  I will second the comment John, that anyone using coax
to feed an outdoor Beverage,  EWE, K9AY, KAZ, or whatever, should have
one of these babies inline. It tightens up the pattern where it should
be and it cuts down the noise. Who knows? That extra DB of signal
without the the noise may be Nibi Nibi?

73,

Patrick

Patrick Martin
KAVT Reception Manager

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[IRCA] Chokes for Coax Lead-In

[John H. Bryant]

I just read Patrick Martin's nice summation of his recent work with 
coax chokes to reduce  the pick up of both unwanted signals and local 
noise on coax lead-ins. He summed things up very well.  Maybe he or 
someone else mentioned that the article explaining the design was 
published in the IRCA bulletin several years ago and is included in 
that marvelous IRCA Reprint CD.  As it happens, the article is also 
available for download on the dxing.info website at 
http://www.dxing.info/equipment/  The article is titled "Is your Coax 
Lead-In an Antenna" and can be found on the lower left portion of 
that web page.

Great job, Patrick. I'm really glad that these inexpensive little 
things solved your problem.  I have a hard time believing that any 
DXer using coax doesn't use at least one of these between the coax 
and the receiver I'd not think of DXing without one, these 
days I need all of the DXing help that I can find, myself.

JOhn B. 

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