[Lowfer] Temp control...

Wed, 24 Sep 2003 19:42:34 -0700

I first thought of series, then thought of a loopback design, what about a
low voltage regulated bulb attached directly to the crystal, adjusted for
reasonable temperature, for example, 2.1V could equal around 70�.  Run from
12V the regulator would keep proper temp even through voltage drops and
increases during battery charge cycle.  The TX will also be in about 3"
closed cell foam which will add some stablility.

Something I will have to play with.

Kurt

---
Ross Technologies Signals Intelligence Division
Rosetta Proving Grounds
----- Original Message -----
From: Bill Ashlock <[email protected]>
To: <[email protected]>
Sent: Wednesday, September 24, 2003 19:39
Subject: Re: [Lowfer] Temp control...

> >From Kurt:
> >Well, I think the oscillator should stay fairly warm, maybe around 60 or
70
> >degrees.
>
> Seems reasonable. Were you thinking about a simple series connection of a
> themistor to a heater?  I can see how that would yeild an oscillating
> temperature. I was first thinking about a contol loop design using and an
OP
> amp to drive the heater. That could be designed to be stable because of
> available loop gain, and phase shifting, to overcome the time lag in the
> thermistor.
>
> Bill A
>
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