[Elecraft] Frequency reference for the K3 directly off a GPS

[Sverre Holm (LA3ZA)]

Some recent GPS modules (ublox Neo 7) have a programmable output that in
addition to the 1 pps output can be programmed even to output 10 MHz. This
output has a lot of jitter as it seems to be derived from a 48 MHz clock
which is divided down in such a way as to generate a mix of short and long
cycles but so that the average frequency is maintained accurately at 10 MHz.

A description can be found here 
https://sites.google.com/site/g4zfqradio/u-blox_neo-6-7 and performance is
partly described here:
https://www.febo.com/pipermail/time-nuts/2014-August/086257.html

My question is regarding the K3 external reference input. Is this source
good enough to drive the K3 reference? Can the K3 clean up the jitter
internally, or does the K3 require a source with much less phase noise?




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Sverre, LA3ZA

K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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