Tom Van Baak skrev:
I'd like to see a similar test conducted against a local Cs clock (and/or
maser), just to get everything on one graph.
-- john, KE5FX
It's on the list.
One earlier idea was to measure tc=1 10 100 1000 10k
simultaneously with 5 Thunderbolts, but I suspected that
unit
Bruce, thanks, I'm soaking it all up.
73, Steve
2009/1/10 Bruce Griffiths bruce.griffi...@xtra.co.nz:
Steve
Steve Rooke wrote:
Bruce,
Thanks for the detailed rundown. Looking at the picket-fence method,
this looks possible for me but I will have to get hold of the
reference standard. I
Dick,
Sorry, Magnus, I didn't mean to put words in your mouth.
No worries, I just did not want it to be raised to truth.
I was remembering last Fall, when you suggested that people look at your
ADEV plot and to be mindful of the of the bounding slopes of the
curves. If I've
Joseph,
time-nuts-boun...@febo.com wrote on 01/07/2009 10:47:46 PM:
Joseph,
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed, RS422 works fine with transformers.
Yes. It would be 10 MHz or 20 MHz, depending on coding. Or 5 MHz, so
Bruce,
Yes, but the bump comes from the increase gain around the resonance and
spoils the OCXO/GPS cross-over. The simplified noise-bandwidth measure
does not really comply here since they usually build on a simplified
model of noise type (white noise - gaussian). A simple check in
Hej Magnus
Magnus Danielson wrote:
Bruce,
Yes, but the bump comes from the increase gain around the resonance and
spoils the OCXO/GPS cross-over. The simplified noise-bandwidth measure
does not really comply here since they usually build on a simplified
model of noise type (white
Hej Bruce,
As the PLL filters the noise of the OCXO and passes noise from the input
side and the noise have several different components to it from either
source.
You can't really extrapolate direction the results of an asynchronous
reciever such as the M12+T to that of a synchronous
Magnus,
At 10:31 AM + 1/10/09, time-nuts-requ...@febo.com wrote:
Message: 5
Date: Sat, 10 Jan 2009 11:06:39 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] Standards sought for immunity of shielded
cable links to power-frequency ground loops
To:
Joe,
For digital signals (1PPS, various triggers), it's RS422 over 100 ohm
twinax (fancy shielded twisted pair).
The 10 MHz sinewave is sent over a pair of 50 ohm coax links, with the
signals 180 degrees out of phase. This is acheived with a pair of hybrid
transformers which convert
Get 'em to use twin-ax (twisted pair inside screen) like the IBM AS/400
terminals (5250?) send differential signal down the cable.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joe Gwinn
Sent: 10 January 2009 15:23
To:
Does any one have pin out and or specs on the Frequency Electronics FE-5062B
Rubidium Standard. Any help would be greatly appreciated. Thanks Bert Kehren
WB5MZJ
**New year...new news. Be the first to know what is making
headlines. (http://www.aol.com/?ncid=emlcntaolcom0026)
WarrenS wrote:
Bruce said:
The critical requirement is that the 2 standards being compared are
statistically independent.
Comparing a pair of Thunderbolts GPSDOs with similar time constants and
damping will give optimistic results for Tau comparable with or greater than
the loop time
Or 1553, for that matter
-Original Message-
From: David C. Partridge david.partri...@dsl.pipex.com
Get 'em to use twin-ax (twisted pair inside screen) like the IBM AS/400
terminals (5250?) send differential signal down the cable.
Dave
___
Magnus,
At 6:02 PM + 1/10/09, time-nuts-requ...@febo.com wrote:
Message: 4
Date: Sat, 10 Jan 2009 19:02:09 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] Standards sought for immunity of shielded
cable links to power-frequency ground loops
To:
Magnus Danielson wrote:
Hej Bruce,
As the PLL filters the noise of the OCXO and passes noise from the input
side and the noise have several different components to it from either
source.
You can't really extrapolate direction the results of an asynchronous
reciever such as the M12+T
Bill Janssen wrote:
WarrenS wrote:
Bruce said:
The critical requirement is that the 2 standards being compared are
statistically independent.
Comparing a pair of Thunderbolts GPSDOs with similar time constants and
damping will give optimistic results for Tau comparable with or greater
Here is two sets of ADEV/OADEV data generated from the PPS and OSC error
estimates produced by the Thunderbolt. There is a set from a run where the
oscillator was disciplined by GPS and a set where the oscillator was
undisciplined. The PPS numbers are probably the best ones to use. Trimble's
Another try to see if I can get some stinkin' CR/LF spacing out of hotmail this
week.
Here is two sets of ADEV/OADEV data generated from the PPS and OSC error
estimates produced by the Thunderbolt. There is a set from a run where the
oscillator was disciplined by GPS and a set where
I just noticed that the ADEV values that I posted for the disciplined
oscillator were for a unit fresh off the boat from China. It had not been used
for several years. It had just completed the self survey right before the
run/log was started. Note the rather bad short term ADEVS that just
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