Date: Thu, 30 Aug 2018 07:44:04 +0100 (IST)
From: MR TREVOR DUNNE <ei2glb@eircom.net>
To: ''''''topband List' <topband@contesting.com>
Subject: Topband: Air Wound Coil
<Hi All
I'm looking for an Air wondering coil like in this link,
http://www.mfjenterprises.com/Product.php?productid=404-0669
I've had one on order from MFJ via a UK company for 4 months now and no sign of
it, I want to build a at matching network for my 160m inverted T using it or
something similar,
Can anyone tell me where I can get one of these or similar that is in stock
today,
I don't have access to the tools/parts to wind one my self,
Thanks
Trevor
EI2GLB
### That mfj coil is listed as a whopping 79 uh ! I cant see having to
use anywhere near that value for a simple 160m T ant.
I calculated the value for a buddy a few yrs back, for his 160m T vertical,
and it was no where near 79 uh...just a few uh. It was easy to wind by hand.
The ant was resonated a bit on the high side, so the Xc of the ant + the coil
formed a step up L network. No different than using a
beta match or hairpin on any mono band yagi. Think we used 8 gauge wire..
which is .128 copper. It was freestanding, after being removed from the
form used to initially wind it on. Coil was oriented vertically..and placed
right across the feed point. Then the vert is also DC grounded.
Jim VE7RF
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