[Boatanchors] Making Stable Inductors for 2 MHz

Fuqua, Bill L wlfuqu00 at uky.edu
Tue Jun 28 23:14:25 EDT 2011

glass or ceramic coil form would be very useful.
For those frequencies you can get a custom crystal oscillator.
If the receiver is not crystal controlled there are 1.8 and 1.8432 MHz packaged oscillators
for only $2 or so.
From: boatanchors-bounces at puck.nether.net [boatanchors-bounces at puck.nether.net] On Behalf Of J. Forster [jfor at quik.com]
Sent: Tuesday, June 28, 2011 9:20 PM
To: boatanchors at mailman.qth.net; boatanchors at puck.nether.net
Cc: arc5 at mailman.qth.net; Milsurlus at mailman.qth.net
Subject: [Boatanchors] Making Stable Inductors for 2 MHz

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.




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