In the ever ending battle to improve my TBolt's performance, I am in the
process of upgrading a OCXO replacement I did to it a while back.
It would be Interesting to hear suggestions from others that have done similar
sort of things and the results they have achieved.
ws
At 11:37 AM 2/16/2010 , WarrenS wrote:
In the ever ending battle to improve my TBolt's performance, I am in the
process of upgrading a OCXO replacement I did to it a while back.
It would be Interesting to hear suggestions from others that have done
similar sort of things and the results they have
Hi:
http://www.standard-time.com/index2_en.php
4 x 12 meter 7-segment display where the segments are boards held in
place by C-clamps. One man can change one segment, but it takes 11 men
and a couple of ladders to change two digits. If fewer (wo)men were
used the time to make a change would
It seems to me there is a way to make the segments folding so they could be
changed without removing and inserting boards. Kind of like a folding
ruler. I'll have to do some experiments with scraps of wood in my shop. On
a smaller scale of course.
When I was little I used to like forming
Hey. You miss the point! It's ART.
-John
=
It seems to me there is a way to make the segments folding so they could
be
changed without removing and inserting boards. Kind of like a folding
ruler. I'll have to do some experiments with scraps of wood in my shop.
On
a
Hi
A similar question though would be - once you have done all the
corrections to the setup of the TBolt (damping, time constant,
sensitivity) what's left to fix?
I would *guess*:
Lower aging
Better TC
Better short term
Aging will likely get better the longer you leave the existing oscillator
Timing newbie here, so please educate me - why does aging matter?
Isn't the whole purpose of a GPSDO to completely eliminate long-term
drift?
Thanks
Henry
On Tue, Feb 16, 2010 at 2:36 PM, Bob Camp li...@cq.nu wrote:
Hi
A similar question though would be - once you have done all the
Thunderbolt PRECISION GPS 10mhz Standard's LED Monitor
I received two from fluke.l 16 days after I sent my PayPal payment.
It was well-packaged and he fit both in one box to save me
shipping costs.
They came with a DB-9P already soldered on the cable and a
typical DC power jack. He even
That gets you to the question - just how good do you think the 1
second AVAR
is on the existing oscillator, independent of the TBolt environment?
If for instance you have a 2.5x10^-12 OCXO in yours, you would only see a
significant improvement with a sub 1.0x10^-12 OCXO. That sort of
Hi
Nothing is ever perfect.
The magic can only do just so well. The lower the aging rate, the better the
result after correction.
A little more detail:
Take a number, maybe 10 ns and call it the error of the GPS signal. Over a 1
second period, that' s not so good (10 ppb). Over 10,000
Henry Hallam wrote:
Timing newbie here, so please educate me - why does aging matter?
Isn't the whole purpose of a GPSDO to completely eliminate long-term
drift?
First degree effect yes, but depending on how you do it, more or less of
the drift remains uncompensated. If you just try to do
On Tue, 16 Feb 2010 15:28:11 -0800, Henry Hallam wrote:
... - why does aging matter?
Isn't the whole purpose of a GPSDO to completely eliminate long-term
drift?
Aging? This remembers me on something...
.When I get older, losing my hair - ...
...will you still need me, will you still feed me,
I cut the lead on pin 4 of the RS-232 connector and hooked it to +12 vdc.
That way I eliminate using another supply. Seems to work alright.
Just need to make sure that pin 4 of the Computer's Serial Port doesn't
have a compatibility problem. (Just means I can't hook up a computer to
the T-Bolt if
It seems to me there is a way to make the segments folding so they
could be changed without removing and inserting boards. Kind of like
a folding ruler. I'll have to do some experiments with scraps of
wood in my shop. On a smaller scale of course.
Several years ago, I walked by one of
Is there a RF Mailing list that anybody would like recommend?
I am mostly interested in homebrew lower frequency (500KHz - 220MHz) range
---
This email message is for the sole use of the intended recipient(s) and may
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Tuesday, February 16, 2010 4:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Hands on digital clock
It seems to me
Jerome Peters wrote:
Is there a RF Mailing list that anybody would like recommend?
I am mostly interested in homebrew lower frequency (500KHz - 220MHz) range
http://www.50mhzandup.org/
Rick N6RK
___
time-nuts mailing list -- time-nuts@febo.com
To
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, February 16, 2010 5:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Hands on digital clock
Lux, Jim (337C)
Jerome Peters wrote:
Is there a RF Mailing list that anybody would like recommend?
I am mostly interested in homebrew lower frequency (500KHz - 220MHz) range
You may find http://groups.yahoo.com/group/emrfd of interest.
Messages are publicly available so you can read and decide before
Hi Jim:
I have samples of two sizes of flipping dot displays, see:
http://www.prc68.com/I/LED.shtml#FD
was going to see how fast they can be flipped using high voltage drive
with a series resistor to lower the time constant, but other things got
in the way.
Have Fun,
Brooke Clarke
You need to state your interests a bit more.
is it ham radio ?
Is it general RF analog ?
Is it digital modulation modes ?
For 500 KHz, part 5, part 15, 137 KHz, 160-190 KHz and 500 KHz look to:
Lowfer mailing list
Home: http://mailman.qth.net/mailman/listinfo/lowfer
Help:
The 50MHz and Up Group of N. Calif primarily has members who really prefer
900MHz and up. When I first formed it, I did invite speakers about 6m and
2m DXing however, since then there has not been much interest in those
low frequencies. However, anyone is definitely welocme to join as either
a
Hi all,
Having recently acquired a new iPhone with a built in GPS, I was wondering
if anyone is aware of an application that uses the GPS 1PPS to produce
accurate time. I seem to remember reading somewhere that it is not possible
to adjust the internal clock, but one could still produce an
I don't believe that there is a 1pps available to the OS.
The GPS chipset seems to provide a very limited amount of data to the
phone. For example, there does not appear to be any way to get
satellite status info from the GPS chip to the OS. At least none of
the apps I've tried thus far
Angus informed that the two buttons are for shifting the freq. up or down,
after one single click the adjustment range is around the center.
Suspect thats adjusting the c field. Would not hurt especially if the unit
was used/surplus.
Try 4000.
On Mon, Feb 15, 2010 at 12:44 AM, Raj
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