[time-nuts] UPDATE: HP 5300B - HP 5308A Counter Time Base...

Dave M dgminala at mediacombb.net
Sat Nov 1 23:26:29 EDT 2014

Are yu sure that it's an OXCO?  According to the manual that I have, the 
only option for the 5300B counter unit was option 001, which added a TXCO. 
The manual doesn't give any data on the Option 001 oscillator, so can't 
confirm that your oscillator is TXCO or OXCO.  If it's a TXCO, it won't get 
very warm, of course, and there won't be any oven control circuitry.

Is there an HP part number on the oscillator module?

Dave M.

Burt I. Weiner wrote:
> The closest it will adjust is -2.5 Hz of 10.0000
> MHz.  This unit differs from the one in the
> manual in that it has a Microsonics OCXO with the
> adjustment on the side of the module.  The oven
> does not feel warm but is written on the side is:
> "Adjust at 25 Deg C", which is about 77 degrees
> F.  The schematic associated with the oven is
> missing from the schematic.  I suspect that the
> oven is either shot or not getting power.  The
> unit will not power up with the boards separated
> so I'm going to have to spend some time hanging
> wires out the side to make measurements.  Does
> anyone know of a schematic showing the
> Microsonics module and the associated circuitry
> for oven control?  Not sure if it's worth the
> effort, but it would be a shame to toss it - that's against my nature.
> Burt, K6OQK 

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