Hi there has been some discussion about stable drive sources for narrow band
modes. One possible source that sometimes becomes available these days is a
Pye/Philips unit which used to be used as the frequency source for
quasi-synchronous radio communication systems, like the wide area coverage
systems of the emergency and utility services. The unit model number is
HS400 and it contains circuitry to lock a crystal to a 5MHz ovened standard
oscillator (2 types with either a Toyo or a Racal unit). The stability
available is a few parts in 10^9. I think these units are now obsolete so
may become more easily available. They are a little large being 19in
rack-mount units. If anyone does find one I have the technical details.
73 de Alan G3NYK
[email protected]
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