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Re: LF: Osc drift

from [G0MRF] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Osc drift
From: [email protected]
Date: Sat, 30 Nov 2002 06:37:35 EST
Reply-to: [email protected]
Sender: <[email protected]>
In a message dated 11/29/02 7:03:23 PM GMT Standard Time, [email protected] writes:



Layout of the IIG oscillator/synthesizer board is quite different from the
II, also the TCXO for the IIG is much bigger and a different part number.
The TCXO for the II is claimed to be a "numerically-controlled" type, that
for the IIG is not. Does anyone know the difference? I thought all tcxo's
were just thermistor-controlled varactor diodes in series with the crystal.



There is a remote possibility that you may have a PLL frequency synthesiser and not a crystal at the frequency that you think.
I recently tried to buy a crystal oscillator module at 70 something MHz only to be told that they were OK for everything except demanding communication applications.
It appears that they frequently have a standard PLL module and just programme it for whatever frequency the customer wants. It's then sold as an Oscillator module, which does contain a crystal, it's just the reference xtal for the internal PLL.
That may go some way to explain the jitter.......or not as the case maybe.

73

David  G0MRF   www.g0mrf.freeserve.co.uk
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