[Boatanchors] Making Stable Inductors for 2 MHz

[J. Forster]

I'm working on LORAN-A not LORAN-C. LORAN-A went away in about 1972. There
is just about nothing left these days.

The operating frequencies are very different (2 MHz v. 100 KHz)

-John

===========



> Pick up an old loran receiver. Should be lots of coils in it tuned to what
> you want. They are cheap as no one wants them anymore.
>
> 73
> Gary  K4FMX
>
>> -----Original Message-----
>> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>> bounces at mailman.qth.net] On Behalf Of J. Forster
>> Sent: Wednesday, June 29, 2011 1:29 PM
>> To: Steve Byan
>> Cc: boatanchors at mailman.qth.net; boatanchors at puck.nether.net;
>> arc5 at mailman.qth.net; milsurlus at mailman.qth.net
>> Subject: Re: [Boatanchors] Making Stable Inductors for 2 MHz
>>
>> Hi Steve,
>>
>> I'll take a look at powdered iron. Thanks.
>>
>> I'd really prefer not to mess with temp comp caps, unless absolutely
>> necessary.
>>
>> Thank you,
>>
>> -John
>>
>> ====================
>>
>>
>> >
>> > On Jun 28, 2011, at 9:20 PM, J. Forster wrote:
>> >
>> >> 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.
>> >
>> > I'm no expert, but isn't the conventional wisdom to use iron toroids
>> > rather than ferrite for oscillator tank inductors, for exactly this
>> reason
>> > of temperature stability? It might also require a temperature
>> compensating
>> > cap of the correct tempco.
>> >
>> > Best regards,
>> > -Steve
>> > --
>> > Steve Byan <stevebyan at me.com>
>> > Littleton, MA 01460
>> >
>> >
>> >
>> >
>> >
>>
>>
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