Topband: Air Wound Coil

[terry burge]

Trevor,

I have found that winding a coil by hand may not look too hot but for a 160 Meter Inv-L they are easy to do. I use my Hytower with it's 65' radials as the counter poise and run a 12 Gauge multi-strain house wire from Lowes over a big Oak tree. Goes up and over the top and almost starts to come down on the far side. Ended up with needing about 123-121 feet of wire. Switches between about 1840Khz up to 1925Khz or so thanks to the switch. And about 60 Khz bandwidth. You can see where I ended up years later with an old commercial broadcast 56uH coil tapped thru a multi-tap switch on my qrz.com/ki7m page. Also added a Balun Design 1:1  just before going into the coil. The inv-L seems to get out real good both stateside and for DX. Hearing them is the problem I am still trying to work out. Too many projects, to little energy here. 

Terry
KI7M 
> On August 30, 2018 at 1:03 PM MR TREVOR DUNNE <ei2glb at eircom.net> wrote:
> 
> 
> Thanks for the replies I want to be able to tap it at various points to allow for some movement up the band, I don't actually know how much inductance as I don't have the antenna in place yet,
> 
> I wound a Homebrew coil last year but I fancied something tidier this time, I was planning to install it in a nice enclosure and have some relays to switch the taps ect,
> 
> MFJ don't seem to have a contact email on there site it just says to order and wait to see if it is in stock don't fancy waiting a few months more it's been 4 already,
> 
> Thanks
> Trevor
> EI2GLB
> ----- Original Message -----
> From: MR TREVOR DUNNE <ei2glb at eircom.net>
> To: ''''''topband List' <topband at contesting.com>
> Sent: Thu, 30 Aug 2018 07:44:04 +0100 (IST)
> 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
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