[hpsdr] OCXO or GPSDO for new Hermes?

[John Ackermann N8UR]

Hermes has an input for a 10 MHz external reference, so nothing needs to 
be done from the HPSDR hardware or software side.  These days, there are 
such a wide range of GPSDO and similar devices that it's not probably 
not cost-effective to develop a new one.  For fixed-station use, it's 
really hard to beat the surplus Trimble Thunderbolts on eBay -- they 
work great and are reasonably priced.

For portable use, it gets a little tougher since for best performance a 
GPSDO needs to be at a known location and stationary.  Surplus Rbs are 
an option although some of them (the cheap FEI-5680s in particular) have 
a lot of spurs and cruddy phase noise and thus aren't good for 
multiplication to microwaves.

Hope this helps.

73,
John
----

On 10/15/2012 11:02 AM, Ken N9VV wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi, has anyone thought about how they will fit an OCXO or GPSDO to the
> new Hermes?
>
> Are there any reference accessory kits still available from TAPR? or is
> this really old technology now?
>
> thanks for your comments,
> 73 de Ken N9VV


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