Hi,
Just a note the thanks to all who helped with the info on the above
gpsdo and the gps engine manuals. Now in the rack and seems rock solid
compared to a 10MHz gpsdo.
Looking at the Trimble manual, looks like a standard Trimble protocol.
Will connect a serial analyser inline to find out
John sent the link on the teensy wwvb AM receiver. It can easily be shifted
to other frequencies. Using the work Frank dcf77 and then Chris wwvb did
with the PJRC audio design tool gives quite a bit of insight to the work
that was done.
The system assumes a sample rate of 192Khz. That limits the
Hi
….. and of course, there was an OCXO that used a beryllium oxide substrate
in pretty much the same way (inner oven in a double oven). Same basic issues
and not exactly cost effective.
The alumina substrate lives on in a number of miniature oven designs.
Bob
> On Nov 1, 2020, at 5:20 AM,
Hi,
On 2020-10-31 17:29, The Fiber Guru wrote:
> Yes, prior to use of GPS to discipline the Local oscillator, telecom timing
> was a “trickle down” topology where a cesium source in Kansas City was
> distributed across the continent.
In Europe for instance, we chose other towns than Kansas
-Tobias wrote-
>Also an interesting material when high thermal conductivity is considered
is boron nitride. It is around five times better than copper, comparable to
diamond and can be sintered to a ceramic material.
>Of course the Wiedemann-Franz-Lorenz law doesn't apply here as it is
Thanks John.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
From: "John C. Westmoreland, P.E."
Date: Sat, October 31, 2020 9:06 pm
To: Discussion of precise time and frequency measurement
Ray,
