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RE: LF: WH2XBA/4 coil

To: "[email protected]" <[email protected]>
Subject: RE: LF: WH2XBA/4 coil
From: Bob Raide <[email protected]>
Date: Tue, 1 Apr 2014 15:54:05 -0400
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That is a great looking coil!  Bob
 

From: [email protected]
To: [email protected]
Date: Tue, 1 Apr 2014 20:28:26 +0200
Subject: Re: LF: WH2XBA/4 coil

Yes... all you'll need for 8.3 kHz is make another coil of same size, but wind ~ 3.5 times as many turns (1160) of 3.5 times thinner wire (0.32 mm). 
 
Try it!
 
73, Markus (DF6NM)

From: DK7FC
Sent: Tuesday, April 01, 2014 8:01 PM
Subject: Re: LF: Re: [Lowfer] 29.499 tonight OP2H/DS...

RR DEX, that looks fine! And it gives an impression between coils at 30 kHz to coils at 9 kHz.

73, Stefan

Sent: Tuesday, April 01, 2014 7:31 PM
Subject: LF: WH2XBA/4 coil

I've received a lot of questions about the new coil:

https://www.dropbox.com/s/2s04hl1zhs4qfhd/25mh_coil.jpg

The form is a pool chemical container from about 20 years past.
Resorting to a more sensible measurement standard I conclude the following:

Total turns counts 325

Coil length 375 mm

This indicates a wire size of AWG 17 which is 1.15 mm diameter  (375 mm
/ 325 turns = 1.1538 mm per turn)

Coil diameter 350 mm

This calculates to approximately 24 mH which is close to the 25 mH I
initially measured which I later revised to 26.1 mH.

However I've made so many calculation errors recently this also may
change :)

Dex


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