Thanks Tom.
I do have a couple of ARRL Antenna Books from the 1950's and there's a
good bit of info in them. Also on L. B. Cebik's web site. I'll keep an
eye out for the vintage handbooks you suggest.
73,
Steve K8JQ
Tom Osborne wrote:
> Hi Steve
>
> If you could find some old ARRL handbooks from back in the 40's, there is
> lots of information there about link coupling antenna tuners. Most of the
> transmitters back then used link coupling in the finals. 73
>
> Tom W7WHY
>
>
>
>
>>Hi Rick,
>>
>>Thanks for the info, I thought the methodology existed but didn't
>>immediately find it. Appreciate the offer to scan and send but I don't
>>think it will be necessary.
>>
>>Jim Lux, in an off-reflector note, steered me to a program named Inca at
>>http://www.coe.ufrj.br/~acmq/programs/. It appears that this will meet
>>my needs.
>>
>>I'm working on a link-coupled antenna tuner for 160 meters and was
>>curious about the coefficient of coupling for the inductive link. Inca
>>indicates the coefficient for my pair of coils is 0.51.
>>
>>Thanks again and 73,
>>
>>Steve K8JQ
>>
>>Rick Karlquist wrote:
>>
>>>Steve wrote:
>>>
>>>
>>>>Just wondering if there's a way to determine coefficient of coupling
>>>>based on the physical dimensions of the two coils and their mounting
>>>>with respect to each other?
>>>
>>>
>>>Of course, F. W. Grover figured this out a century ago.
>>>
>>>Grover, "Formulas and tables for the calculation
>>>of mutual and self inductance", NBS Paper 169, 1912.
>>>(NBS is now NIST)
>>>
>>>Grover, "Tables for the Calculation of the
>>>mutual inductance of any two coaxial single
>>>layer coils", Proceedings of the IRE,
>>>July 1933 pp 1039-1049. (IRE is now IEEE).
>>>This paper claims to have easier to calculate
>>>formulas. Of course that was precomputer. Not
>>>clear which would be easier now.
>>>
>>>I have the latter paper in my personal library. I can
>>>scan it in if you can't find it at your local engineering college.
>>>I also have the NBS book, but it is fairly lengthy to scan in.
>>>
>>>
>>>
>>>>Didn't find it in the Handbook, nor did a google search turn up anything.
>>>
>>>
>>>Google on "grover" and "inductance" and you'll get a bunch of hits.
>>>
>>>
>>>>Steve K8JQ
>>>
>>>
>>>I can tell you ahead of time that it is difficult to get coupling
>>>above 50% and impossible above 80% or so.
>>>
>>>Rick N6RK
>>>
>>>
>>
>>_______________________________________________
>>
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>>
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>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
> questions and ask for Sherman, W2FLA.
>
> _______________________________________________
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>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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