[time-nuts] HP 58540A Phase Noise Improvements

[wa1zms at att.net]

Paul-

Are you trying to improve the far-out phase noise of the IC-7800 to help
with things like RX dynamic range or are you trying to improve the very close-in noise for narrow bandwidth modes like WSJT?  The two can require different solutions.

-Brian, WA1ZMS

 -------------- Original message ----------------------
From: "Paul Christensen" <pchristensen at ieee.org>
> I am currently using a HP 58540A GPS-disciplined OCXO as the frequency 
> reference to an ICOM IC-7800 transceiver.  I am looking to improve the phase 
> noise performance of the 58540A.
> 
> Although some HP 58540A units contain the MTI 230-series OCXO, I have been 
> considering the MTI 260 series for its superior phase noise performance but 
> it uses a larger PC board footprint.  The PC board in the 58540A seems to 
> have accommodated several OEM's form factors as evidenced by the PC board 
> silk-screen.
> 
> Does anyone have any suggestions as a replacement OCXO with excellent phase 
> noise approaching -160 dBc @ 1 kHz?  Are there any special precautions or 
> other alignments required when dropping in a replacement OCXO?  Thanks!
> 
> Paul
>  
> 
> 
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