albertson.ch...@gmail.com said:
If you ned the 10KHz, Jupiter is one that has been used. I think a 10KHz
GPS will make your GPSDO converge quickly ...
Does the 10KHz signal change smoothly or does it jump to a new value once per
second?
Has anybody looked at the fine print? What sort of
Hal Murray wrote:
albertson.ch...@gmail.com said:
If you ned the 10KHz, Jupiter is one that has been used. I think a 10KHz
GPS will make your GPSDO converge quickly ...
Does the 10KHz signal change smoothly or does it jump to a new value once per
second?
Has anybody looked at the
On 9/19/2013 5:33 AM, Chris Albertson wrote:
But 10KHz does allow
a simpler design for the GPSDO that can be done 100% analog
A very simple, full analog, GPSDO that exploits the 10 kHz from a Jupiter
GPS receiver can be found here :
http://gpsdo.i2phd.com/
73 Alberto I2PHD
Hi
It's not the best thing to use. Since the 10 KHz jumps once a second, it's not
really very useful. The GPS it's self is not as well optimized for timing
applications as a UT or a LEA-(any number) T. At auction prices, the GPS isn't
going to be the major cost item in your GPSDO. Better to
HI
What can be said with reasonable confidence:
1) The unit isn't broken and it does not need to go back to RDR under their 30
day return policy.
2) The OCXO isn't broken and it does not need to be replaced.
3) The unit is functioning ok, but probably not as good as it could.
4) Without
Bob,
please have a look to the flwng link. about the stability..
http://www.jrmiller.demon.co.uk/projects/ministd/stab.htm
Rgds Ernie.
-Original Message-
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu,
Thanks Bob, Charles,
Well, here's my plan. Get a single piece of RG-11 direct burial. Get a more
stable post for the antenna and perhaps a bit taller. Keep my eye out for a
different antenna, right now they seem to be going for $50 and up for the 26 dB
versions, I could contact RDR, but I
I was playing with SpecLab and my TS-2000 just to see how accurately I could
measure frequencies in the HF region. I notice when I set the rx on cw and
listen to the 750 Hz output of WWV at 15 or 20 MHz with SL, I get like 2 and
sometimes more tracks about 2 Hz apart constantly shifting
I knew it was not that easy. I didn't think about WWVB, and yes, I hear them
quite often on 20. So it's just a matter of averaging what you can measure and
assuming that the average will be close? I can imagine the shift can be all
one way or the other for extended periods and how would
On 9/19/2013 6:48 AM, quartz55 wrote:
I was playing with SpecLab and my TS-2000 just to see how accurately I could
measure frequencies in the HF region. I notice when I set the rx on cw and
listen to the 750 Hz output of WWV at 15 or 20 MHz with SL, I get like 2 and
sometimes more tracks
We are building a VHF radio system that we intend to be simulcast when
completed; we need 2 or 3 more of the (used to be!) low cost used
Thunderbolt GPSDO units to get our sites on the same frequency using this as
a standard. We already have the Larsen antennas ready; now just hunting like
3 more
You shouldn't be seeing a 2Hz spread. It can happen but in my experience that
is big. Check gain control and make sure you aren't seeing artifacts. There
is an fmt-nuts on yahoo which may be more appropriate for this.
Doc
Sent from mobile
On Sep 19, 2013, at 10:32 AM, quartz55
Hi,
I'm working on a Varian 921-0062 ion pump controller for the pumps used
in a Maser.
I just got it in and it is wired for 240 VAC and I want 120VAC.
My manual and the ones I can find on line show a power TX with 4 input
terminals which they show how to strap for 240 or 120 VAC.
My unit
Hi Corby,
How's it wired now? Basically it should be two windings in series, say line to
1, 2 linked to 3 and neutral to 4. To set to 120V leave line and neutral were
they are and link 2 to 4 and 3 to 1. As a double check for phasing when you
lift the link between 2 and 3 check for winding
So, Magnus, what does a baked picosecond taste like?
How many to make a mouthful?
Just an attempt to raise the humor level on this list :)
Bill Hawkins
-Original Message-
From: Magnus Danielson
Sent: Thursday, September 19, 2013 3:14 PM
Fellow time-nuts,
Every once in a while, you
Fellow time-nuts,
Every once in a while, you find that a felliow time-nut is in town.
That's when food and beer is supplemented with optimal baking methods
and picosecond precision timing and well, fun.
I do hope Joe and his wife found their way back in the dark yesterday :)
Just wanted to
Just got a XSC and a spare module, works great but would like to get a
manual/
Any help will be appreciated.
Thanks Bert Kehren
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Try a Google search on it, you will find the manual.
73, Dick, W1KSZ
On 9/19/2013 12:43 PM, cdel...@juno.com wrote:
Varian 921-0062 ion pump controlle
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Hi,
I may have missed something back then, but I don't recall any description of
exactly how it was generated - more a discussion of what the manuals/datasheets
meant.
Angus
From: Bruce Griffiths
To: Discussion of precise time and frequency measurement
Sent: September 19, 2013 8:22 AM
Hi
With a Trimble TBolt, when you do an auto-cal it comes up with a sensitivity of
the OCXO, and modifies the filter (as in the PID control loop filter)
coefficients. You can then save them to the eeprom / flash in the TBolt. The
settings persist across multiple reboots. The settings do impact
Here is the deal.
The 4 terminal TX wiring is pretty obvious. (I have a unit with the 4
terminal to compare with)
The 6 terminal I have ohmed out and it is not obvious!
Pins 1 to 3 and 2 to 4 (.5 Ohms) appear to be the 120VAC windings and
hooking them in parallel should do the trick.
As wired
Hi
Based on the plot shown, the GPS is doing about 2x10^-12 at 1,000 seconds. That
translates to roughly 2 ns at one second. The newer timing receivers can get
down to about 4 to 5X better than that.
Bob
On Sep 19, 2013, at 8:02 AM, Erno Peres erniepe...@aol.com wrote:
Bob,
please
Hi
Remember - there's more than one station on 5, 10, 15 and 20 MHz. You may be
picking up the modulation from one of them. Ionospheric shift can easily give
you a few Hz on HF.
Back when I was doing FMT stuff there was no ionosphere involved. I was within
ground wave of Newington ….
Bob
So it's just a matter of averaging what you can measure
and assuming that the average will be close?
Two quick comments.
1) A gradual phase drift over time is identical (by definition) to a frequency
offset.
2) In general, averaging a moving target gets you *less* accuracy, not more.
We
Hi
As with most complex questions the real answer is that depends …
Blind averaging will indeed get you in trouble. Curve fitting (a straight line
is a simple one) often is the better approach to phase data. You can get an
averaging like improvement (square root of the number of samples). You
Hi Bill,
I have a number of these modules purchased from the particular eBay source
you gave a link for. They work well but I never found a way to keep their
data output as NMEA as they seem to revert to Binary on power down. However
if it is just the 10KHz output you want from them or
Hi Merv,
Thanks. I will try one.
This is a great group!
Bill
-Original Message-
From: Merv Thomas
Sent: Thursday, September 19, 2013 9:01 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS with 10KHz output
Hi Bill,
I have a number of these modules purchased from the
In the Trimble NTBW50 (and Trimble made clones) you can run the auto cal via
LH. The sensitivity is calculated and may appear to change. The settings can
not be saved in flash / eeprom. They do not persist across multiple reboots.
There is no evidence that the NTBW50 actually uses the changed
But when working with clocks (time, frequency, stability measurements) this
assumption often not true and it's helpful to think of averaging more as a
disease than a cure.
/tvb
I can understand that.
Dave
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And if you manage to eat just a half you can travel in time!
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bill Hawkins
Sent: Friday, 20 September 2013 7:32 AM
To: 'Discussion of precise time and frequency
Hello All,
I just spoke with JL - I should have one of the Jackson Labs' LC_XO's in my
hands soon (TCXO option) - I was wondering if any of you have had a chance
to look at it - and what your opinion is
of the unit? If you have taken any detailed measurements you would like to
share - that will
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