[time-nuts] eBay seller has Z3801A upgraded to 58503A

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Thu Nov 27 17:55:06 EST 2014

There's a seller on eBay selling what he says is Z3801A upgraded to
58503A. One or two things have made me a bit suspicious of that seller
- nothing to do with his GPS things. Does anyone know what he does? He
also have an 58503A, but that's a couple of hundred $'s more than an
upgraded Z3801A.

I've been thinking of buying one of the Jackson Labs devices, which is
obviously a more modern design, but I'm giving some consideration to
buying a used GPSDO with an OCXO, rather than a TCXO. By the time I
purchase the TCXO based unit, stick it in a box, build a buffer, add a
power supply etc etc, it is not going to work out a lot cheaper than
buying a used OCXO device.

My mind is not made up about this. There are advantages and
disadvantages of both.

Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)

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