Bob kb8tq writes:
> It’s just like the other uBlox modules (and just like the F9T …) the external
> input is a once a second time stamper with an 8 ns resolution (just like the
> +/- 4 ns on the sawtooth ….).
A minor nit: If it works as the M8 series does (which is very likely),
the timestamp
Hi
The trick is that a good 125 MHz OCXO has better phase noise at 100 Hz than a
multiplied 5 or 10 MHz OCXO. By the time you get to 30 Hz, usually the lower
frequency
multiplied up wins. By the time you get to 3 Hz, the much higher Q HF OCXO
always
wins. (Yes, you could have a great 125 MHz
Hi
It’s just like the other uBlox modules (and just like the F9T …) the external
input is a once a second time stamper with an 8 ns resolution (just like the
+/- 4 ns on the sawtooth ….). One would *guess* they are using the same
free running / TCXO clock for both the PPS out and the timestamp
Hi Jim,
On 2019-02-13 14:24, jimlux wrote:
On 2/12/19 6:31 PM, Bob kb8tq wrote:
Hi
The normal approach as you head from HF up through stages to
microwaves is to stop
at various points along the way. Just where depends on the actual
noise you measure on
the sources you have. (Yes you have
On 2/12/19 6:31 PM, Bob kb8tq wrote:
Hi
The normal approach as you head from HF up through stages to microwaves is to
stop
at various points along the way. Just where depends on the actual noise you
measure on
the sources you have. (Yes you have to measure them yourself).
Once you have your
Hi Bob,
Do you say that you managed to get a external frequency input?
Or is it a timestamp input?
Cheers,
Magnus
On 2019-02-13 00:18, Bob kb8tq wrote:
Hi
The inability to switch the ext input over to time mode may be why they
are still working on the F9T. I have gotten mine to work, darn
Hello Time-Nuts,
Not strictly time-nuts related, but the group seems to have
outstanding resources. I'm looking for information (specifically the
serial commands) for the Stanford Telecom STel-9270 Universal DDS
Interface. This box has a serial interface that talks to a PC and
produces a
On 2/12/19 4:41 PM, Jeff Blaine wrote:
OK. I would still be interested to see if anyone has plots on the close
in noise profile of the Lucents. The XO part has an Efrom OCXO and I
can assume it's similar to a generic OCXO. But the RB is an unknown - I
have no idea what to expect from that.
Hi
You have a *ton* of digital this and that all on a common ground with the RF
output.
The original specs didn’t sweat the spurs so the designs are what they are. The
OCXO’s
are down in the -130 dbc/Hz range at 10 Hz offset. The Rb’s ten’s of db worse.
Nobody
seemed to mind ….
If you go
