[ARC5] Re-reading Gordon White article...L-2 in a 'command' receiver

[J. Forster]

Genius, maybe.

To me, relying on a resonance between the inductance and parasitic
capacitance in a coil seems very much 'consumer' cost cutting.

YMPV,

-John

=============




> On 6 Jun 2013 at 0:00, Mike Morrow wrote:
>
>> Ken wrote:
>>
>> > In every case, the resonant frequency of L-2 is way below the
>> > lowest frequency the receiver will tune.
>>
>> Here's what the June 29, 1940, ATA/ARA instruction book has to say
>> about L-2:
>>
>> "C-39 (across L-2 in the 190-550 KC receiver only) serves to tune L-2
>> to a frequency lower than 190 KC, and by so doing increase the
>> amplification of signals at the low frequency end of the tuning range.
>> This assists in producing a reasonably uniform receiver sensitivity
>> over the tuning range.  The plate to screen capacitance of the RF
>> amplifier tube, Type 12SK7, and the wiring capacitance to L-2, perform
>> a corresponding function in all other receivers."
>>
>> That, no doubt, would be the explanation that Dr. Drake would give
>> you.
>>
>> Mike / KK5F
>
> That makes complete sense, Michael. Thank you.
>
> Another reason for me to think that those ARC engineers were geniuses...
>
> It appears that they thought of every possibility and dealt with it
> appropriately.
>
> Amazing!
>
> Ken W7EKB
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