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

[Kenneth G. Gordon]

On 13 Mar 2013 at 15:21, john rose wrote:

> 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

I believe Ian measured and calculated 28 uH for this one.

> 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. 

John:

That calculator is always just a bit off, but well worth using. I think the error is on the order of 
less than 1%, but may be a bit more. In any case, the error is probably less than what a 
home-brew copy of the coil would be.

Thanks for doing this, John and Ian.

However, if you would please be so kind as to post the number of turns and the lengths of the 
coils (if any are different than 3" long) I, for one, would be very grateful.

I have wanted that data for a long time, and this will go in my "ARC-5" data collection.

Thanks again,

Ken W7EKB