[time-nuts] Tbolt temperature sensor

John Ackermann N8UR jra at febo.com
Thu Feb 5 20:31:42 UTC 2009

Here's my view as a ham, not as a time-nut (well, as much 
not-as-a-time-nut as I can manage):

Even at 10 GHz, it's easy to get sufficient frequency accuracy; 1x10e-10 
is only a 1 Hertz error, and I doubt anyone is going to be unable to 
find you if you're even 100 times further off than that.

However, depending on the mode you want to use, and the way you are 
getting from 10 MHz to 10 GHz, short term frequency stability may be 
important, and phase noise may be even more important.  Remember that 
phase noise increases 20dB for every decade of multiplication, so a 
noisy oscillator can start to sound pretty fuzzy on 10 GHz CW.

Particularly if you're considering mobile/portable operation where a 
GPSDO has the disadvantage of needing to be told where it is, I think a 
better choice may well be a low noise free-running OCXO that you 
calibrate every month or so against the GPSDO in the shack.


Dave Ackrill wrote:
> I've been reading the discussions and have to admit that alot of it is 
> out of my depth.
> My question is this, does any of this mean that I should not use the 
> Thunderbolt to lock the 10MHz OXCO input of my newly bought, and still 
> being put in a box, 10GHz transverter?
> I guess that it will be light years ahead of the 'stability' of my old 
> wideband FM gear, possibly not quite up to moon bounce but not bad overall.
> I am getting a bit of deja vu here as I think I probably asked a similar 
> question the last time the thunderbolt was discussed regarding accuracy 
> of the 10MHz output...
> Dave
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