[Boatanchors] Making Stable Inductors for 2 MHz

[Gary Schafer]

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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