[Boatanchors] Optimum L/C ratio chart(s).

[KEN]

Hi Al,

What a suprise! You must have been rummaging thru old files!
I have acquired an old, and I do mean OLD Variometer used
back before the appearance of the AM BCST operations, in
the maritime services down on 500 Kcs. and workig frequencies
just below that no doubt back in spark transmitter days!

A long planned research is to use this variometer along with a
"straight line frequency variable condenser" which I also have
found. By jockying both and measuring output of signal I
should be able to determine the "optimum" values of L and C
for the various frequencies on the AM Band. Now, the
task is to find the correct coupling between both L & C
to have them "track" across the AM BCST band.
I have the Sencore "Z" meter so measuring the L & C
should be no problem.

I am an ardent Crystal Radio Receiver fan and have been
since the early 30's  when I built my first one.
Take care,

Ken   N5CM




----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, April 13, 2010 11:51 PM
Subject: Re: [Boatanchors] Optimum L/C ratio chart(s).


> Ken,
>
> The classic values are 365 pF and 250 uH.  This comes about because of
> the high distributed capacitance of old fashioned coils like close wound
> solenoids.  The issue is being able to reach both ends of the band.
> Things get a lot easier with modern iron-core inductors.  Charts and
> equations won't help much if you can't measure the self-resonate
> frequency of the coil.
>
> Al
>
> On 8/3/2009 12:15 PM, KEN wrote:
>> Fellows,
>>
>> I am searching for a chart that will give me the optimum L/C ratio for 
>> the frequencies of the AM Broadcast Band.
>>
>> I seem to recollect there was one in the large book, "Gharardi Radio 
>> Physics Course" (Not sure of spelling).
>> But, can't locate my old copy - may be gone!
>> Any help appreciated&   take care,
>>
>> Ken   N5CM
>>
>>


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