Take a look at what KA6SQG did to sync both audio and RF from GPS for
this five-site 440 MHz simulcast repeater system.
http://www.wb6ece.org/technical-info.html Play the youtube video
while flipping through the slides. You'll need headphones to get
acceptable audio from the youtube.
I live in the area covered by this system, and can attest that it works
quite well.
73, Jim K9YC
On Thu,8/13/2015 6:59 AM, Matt Zilmer wrote:
Hi Sverre,
This type of 10 MHz output has short term stability problems and isn't
suitable for direct drive of a K3 (imho). It *could* be used, if
integrated over a long time constant (thinking many seconds) to drive
a D.O., but that would take additional circuitry. It might be quite a
project.
You're probably better off with A GPSDO or a Rubidium source. Even a
plain OCXO would work if you can keep it calibrated.
73,
matt
W6NIA
On Thu, 13 Aug 2015 06:36:31 -0700 (MST), you wrote:
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?
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
