[Boatanchors] Making Stable Inductors for 2 MHz

[J. Forster]

Because I need the four LORAN-A frequencies and it would take an analog
multiplier and envelope shaper to get the RF pulse shape right. Ditto for
DDS.

I have it working with 1 transistor and 7 discretes. All I need is a
stable inductor.

I would use coils out of an ARC-5 or other radio, but don't have
sufficient design info and in any case, I don't want to cut one up.

Best,

-John

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



> John,
>
> Why don't you crystal control the thing and be done with it.  2.000 or
> 2.048 computer rocks are cheap and easy to get.
>
> Al
>
> On 6/28/2011 9:20 PM, J. Forster wrote:
>> Hi All,
>>
>> I'm working on a LORAN-A simulator for the DAS-1 on the MASSACHUSETTS
>> and
>> have a design question.
>>
>> Background:  LORAN-A transmitted 30-40 uS pulses, carefully times, on
>> about 1800 to 2100 KHz. I have the timing =ssues solved.
>>
>> 'm now looking at building a stable, keyed oscillator in the above
>> frequency range. My intention is to use a SS Hartley or Colpitts.
>>
>> The frequency stability requirement is not great... about +/- 5 KHz, but
>> this is larger than can be achieved with ferrite cores I've looked at,
>> which are>  0.05% / deg. C.
>>
>> Any suggestions? I'm thinking of an air core inductor, maybe 1/2" x 1
>> 1/2"
>> with roughly 120 T of #30.
>>
>> Best,
>>
>> -John
>>
>> ==============
>>
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>
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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