[ARC5] Making Stable Inductors for 2 MHz

[Mike Feher]

John -

Regular ham VFOs do better than what you are asking for. About 40 years ago
using a SWAN rig I got a notice of violation that I was about 100 Hz out of
band, while chasing DX. This was on 20 meters, with a tube VFO. You should
have no problems with your analog solution. If you are really concerned, you
may try a digital solution. Regards -Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of J. Forster
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: [ARC5] 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.

Best,

-John

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

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