[ARC5] [Milsurplus] ARC5/SCR-274N question - L-52 - Correction

[john rose]

Wow. Did I ever get an edjumakation. I have an ARRL "Single Layer Coil Winding Calculator" slide rule. Introduced around 1970, it is still in their catalog. I decided today is as good a day as any to spend a couple hours learning to use it....... It took 20 seconds. I then went to the storage area, counted the turns on each stock # I own, and started sliding.

T-16, 17, 18 #7992 = 96uH
T-19, BC-696 #6033 = 45uH
T-20, BC-457 #6034 = 26uH
T-21 22, BC-458, 459 #6035 = 15uH

If anyone who owns a T-15 would a) measure the coil length and b) count the number of turns this would complete the chart. I'm thinking it is 3 inches like the rest, has 80 turns, more or less, which would yield 180uH.

----------------------------------------
> Date: Wed, 13 Mar 2013 12:33:19 -0700
> From: ianmwilson73 at gmail.com
> To: kgordon2006 at frontier.com
> CC: arc5 at mailman.qth.net
> Subject: Re: [ARC5] [Milsurplus] ARC5/SCR-274N question - L-52 - Correction
>
> This T-20/BC-457 antenna inductor has 33 turns, 3" long, 2" dia.
> My solenoid calculator says 28uH which agrees exactly with what I measure.
>
> 73, ian K3IMW
>
> On Wed, Mar 13, 2013 at 12:17 PM, Kenneth G. Gordon <
> kgordon2006 at frontier.com> wrote:
>
> > On 13 Mar 2013 at 11:47, john rose wrote:
> >
> > > The Air Force "Spare Parts List Radio Set SCR-274-n" offers precious
> > > little more; BC-696 42 turns of #18 tinned copper wire on a ceramic
> > > form; BC-457 tinned copper wire coil on ceramic form; BC-458 and
> > > BC-459 14 turns of tinned copper wire coil wound on a ceramic form;
> > > Parts numbers match ARC-5 numbers.
> >
> > Since we know the diameters and lengths, or can find those out, we should
> > be able to measure or calculate the inductances.
> >
> > Ken W7EKB
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