[Boatanchors] Making Stable Inductors for 2 MHz

[J. Forster]

That's a good idea. Thank you. I'll look into it. If nothing else, the
coil form and can would be a very good start.

Best,

-John

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

> How about an oscillator coil designed for the old AA5 broadcast band
> receivers?  The LO's operated above the operating freq by about 455KCs.
> Remove the slug and yyou'd have an air core coil that would most likely
> resonate above 2MHz, then pad it down with capacitors.  I think most of
> them were usually for a Hartley Osc, a fet would probably do the job
> nicely. . .
>
> Antique Electronics in Arizona used to have 'universal replacements' for
> them and may still have them.
>
> 73 de Phil,  KO6BB
> http://www.qsl.net/ko6bb/   (Web Page)
> http://ko6bb1.multiply.com/ (My OTR Blog)
> http://cbsmysterytheater.multiply.com/ (My CBS
> Radio Mystery Theater Blog)
>
> RADIOS:
> Yaesu FT-2000 Xceiver for "hamming" and LF Beacons.
> Zenith "American" Royal-7000 Transoceanic. (circa 1970)
> Realistic DX-380 Digital Portable.
>
> Central California
>
> 73 de Phil,  KO6BB
> http://www.qsl.net/ko6bb/   (Web Page)
> http://ko6bb1.multiply.com/ (My OTR Blog)
> http://cbsmysterytheater.multiply.com/ (My CBS
> Radio Mystery Theater Blog)
>
> RADIOS:
> Yaesu FT-2000 Xceiver for "hamming" and LF Beacons.
> Zenith "American" Royal-7000 Transoceanic. (circa 1970)
> Realistic DX-380 Digital Portable.
>
> Central California
>
>
> On 6/29/2011 3:45 AM, J. Forster wrote:
>> 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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>>
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>
>