[Boatanchors] Making Stable Inductors for 2 MHz

[Philip (KO6BB)]

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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