Me too,
Didn't say anything before to keep the noise down.
Robert G8RPI.
From: Alan Melia alan.me...@btinternet.com
To: time-nuts measurement time-nuts@febo.com
Sent: Tuesday, 16 April 2013, 0:40
Subject: Re: [time-nuts] Brooks Shera ASM release
Bert I am
: [time-nuts] Brooks Shera ASM release
Alan
You may suggest something to time nuts, looking at the response I doubt it
and ask my self why did three of us spend three weeks to fully check it out
and fix some of the code. Will reflect future projects.
Bert Kehren
In a message dated 4/12/2013 8:39
measurement
Subject: Re: [time-nuts] Brooks Shera ASM release
Bert,
I certainly appreciate all the work that has gone into the latest code. I
learnt a lot from Brook's original (1.33) and modified it to suit my 'peculiar'
hardware. I've only had time for a short look at the latest but I'm sure
Alan
You may suggest something to time nuts, looking at the response I doubt it
and ask my self why did three of us spend three weeks to fully check it out
and fix some of the code. Will reflect future projects.
Bert Kehren
In a message dated 4/12/2013 8:39:40 P.M. Eastern Daylight Time,
Hi Bert,
Just because there was not much response to this inquiry does not mean
that your efforts are not appreciated. Considering how many requested
the earlier code (many in person to myself) I expect your work is VERY
MUCH appreciated.
Thank you,
David
On 4/15/13 3:17 PM,
On 04/15/2013 10:00 PM, David McGaw wrote:
Hi Bert,
Just because there was not much response to this inquiry does not mean
that your efforts are not appreciated. Considering how many requested
the earlier code (many in person to myself) I expect your work is VERY
MUCH appreciated.
I for one
Hi Bert,
I do fully support David's opinion, I appreciate very much all the past
and future work on this subject like all other developments in the group,
so please don't stop, it made me happy when I got the code list in your
past mail!
Thank you very much,
regards,
Arnold, DK2WT
am
, April 15, 2013 8:17 PM
Subject: Re: [time-nuts] Brooks Shera ASM release
Alan
You may suggest something to time nuts, looking at the response I doubt it
and ask my self why did three of us spend three weeks to fully check it
out
and fix some of the code. Will reflect future projects.
Bert Kehren
Bert I am grateful for the work you and friends have done.
Is there any way we can add our names to some expression of thanks from
members of the Group to his widow Karen and her helpers for their work in
making the checked source code for the GPSDO available to us and maybe leave
a token of
and expertise
the Group provides..and it is nice to be able to say so, and salute the
work Brooks did.
Thanks and Best Wishes
Alan Melia
(G3NYK)
- Original Message - From: ewkeh...@aol.com
To: time-nuts@febo.com
Sent: Monday, April 15, 2013 8:17 PM
Subject: Re: [time-nuts
Bert,
As one of Brooks customers I would like to express my thanks to him
for his generous work (fortunately I did it when we contacted in early
2009), and also now to thank you and the others who made possible to
finally have his code, including the efforts to fix and test it.
And of course
Bert
Thank you for working to share Brooks code with the time-nuts.
Regards
Paul.
On Fri, Apr 12, 2013 at 2:28 PM, ewkeh...@aol.com wrote:
Attached is Brooks Shera’s final source code and hex file. As a reminder
in all of his released code Brooks requested that any use of his code be
Gentlemen,
this is a very good note,
many thanks for this very interesting information and the work behind!
I will try to implement the new code and a new processor without
mistakes from my side.
Regards,
Arnold, DK2WT
Am 12.04.2013 20:28, schrieb ewkeh...@aol.com:
Attached is Brooks
Bert is there any way we can add our names to some expression of thanks to
his widow Karen and her helpers for their work and maybe leave a remembrance
of his worldwide friends for his family?
Thanks for your efforts
Best wishes
Alan Melia (G3NYK)
UK
- Original Message -
From:
On 03/26/2013 01:35 AM, Bruce Griffiths wrote:
Richard H McCorkle wrote:
Hi Tom,
In the Shera design the instability of the XO timebase is
a key factor in improving the 30-second update resolution.
With the XO drift varying the sample point across the 1PPS
and 312.5 KHz edges the samples are
Hi
One very important thing to consider when looking at this design - it was done
in the era of selective availability. That provided a lot dither all by it's
self.
Bob
On Mar 25, 2013, at 10:05 PM, Richard H McCorkle mccor...@ptialaska.net
wrote:
Bob,
You are preaching to the choir and
On Mon, 25 Mar 2013 00:43:02 -0400
Daniel Schultz n8...@usa.net wrote:
Another great ham passes on, I'm sorry I never had a chance to meet him.
Definitly a sad day
Is the GPS controller that Brooks published still useful today, or has it been
superseded by something newer?
That highly
I think Brooks' design is worth studying. It is simple enough and
uses 20 year old technology so even use old folks can follow how it
works. Then you go off and build something else using current parts
I have one of those cheaper Rb units too. But you set them by sending
a command over the
Chris,
Can you point me to the web site where the TI Launch Pad is sold for $5
including
shipping ?
Thank you,
BillWB6BNQ
Chris Albertson wrote:
snip
I plan to use a $5 TI Launch Pad. But
basically the same over all ideas he used. At $5 each with shipping
included TI is losing
and frequency measurement; Chris Albertson
Subject: Re: [time-nuts] Brooks Shera
Chris,
Can you point me to the web site where the TI Launch Pad is sold for $5
including
shipping ?
Thank you,
BillWB6BNQ
Chris Albertson wrote:
snip
I plan to use a $5 TI Launch Pad. But
basically the same
Brooks GPSDO may be 15 years old but is still perfect for today's
applications. If you look at tvb's Tbolt plot or Ulrich's plots with and
without
sawtooth correction for a day or two the limit is GPS. The basic unit has a
resolution of 1.73 E-13 in mode 7. Brooks uses a 40 bit filter. I
The lack of synchronisers when crossing clock domains is a design flaw
that should be corrected.
Bruce
ewkeh...@aol.com wrote:
Brooks GPSDO may be 15 years old but is still perfect for today's
applications. If you look at tvb's Tbolt plot or Ulrich's plots with and without
sawtooth correction
Bruce, would you mind being more specific and offer a solution.
Thanks Bert Kehren
In a message dated 3/25/2013 7:09:41 A.M. Eastern Daylight Time,
bruce.griffi...@xtra.co.nz writes:
The lack of synchronisers when crossing clock domains is a design flaw
that should be corrected.
Bruce
On Mon, 25 Mar 2013 07:53:40 -0400 (EDT)
ewkeh...@aol.com wrote:
In a message dated 3/25/2013 7:09:41 A.M. Eastern Daylight Time,
bruce.griffi...@xtra.co.nz writes:
The lack of synchronisers when crossing clock domains is a design flaw
that should be corrected.
Bruce, would you
On 3/24/13 8:22 PM, Chris Albertson wrote:
On Sun, Mar 24, 2013 at 7:34 PM, EB4APL eb4...@cembreros.jazztel.es wrote:
I wanted to build a GPSDO using the Brooks Shera design since I read the QST
article. I asked him in Jan 2009 about his source code, because I wanted to
change the PIC to a
The lack of synchronisers when crossing clock domains is a design flaw
that should be corrected.
Bruce
I think with these it becomes obvious where the problem lies and what
the solution is.
Attila Kinali
I realize there are many cases where clock domain considerations are important.
On 25 March 2013 13:36, Jim Lux jim...@earthlink.net wrote:
On 3/24/13 8:22 PM, Chris Albertson wrote:
This is a perfect example of why people need to publish the source.
Make it GPL or whatever.
That's a decision that the author gets to make. I've been on both the
supplier and consumer
On Mon, Mar 25, 2013 at 5:44 AM, Attila Kinali att...@kinali.ch wrote:
On Mon, 25 Mar 2013 07:53:40 -0400 (EDT)
ewkeh...@aol.com wrote:
In a message dated 3/25/2013 7:09:41 A.M. Eastern Daylight Time,
bruce.griffi...@xtra.co.nz writes:
The lack of synchronisers when crossing clock domains
On Mon, Mar 25, 2013 at 6:36 AM, Jim Lux jim...@earthlink.net wrote:
The algorithms are well known and understood, and not very complex. Perhaps
starting from scratch wouldn't be a bad thing if you're going to an entirely
new platform.
They are well known to people who already know. If you
A system like that would protect the author, but ensure that in the
event of their death, the code is public. That license could be GPL,
freeware of whatever else the author choses. I suspect Brooks Shera
would have agreed to do something like that.
We don't have to guess. Brooks wrote near
] On
Behalf Of David Kirkby
Sent: Monday, March 25, 2013 10:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Brooks Shera
On 25 March 2013 13:36, Jim Lux jim...@earthlink.net wrote:
On 3/24/13 8:22 PM, Chris Albertson wrote:
This is a perfect example of why
On Mon, Mar 25, 2013 at 2:56 PM, Tom Van Baak t...@leapsecond.com wrote:
I realize there are many cases where clock domain considerations are
important. But why does it matter in a device that is simply doing long-term
1PPS statistical sampling?
Could one of you clock domain specialists
On Mon, 25 Mar 2013 06:56:30 -0700
Tom Van Baak t...@leapsecond.com wrote:
I think with these it becomes obvious where the problem lies and what
the solution is.
I realize there are many cases where clock domain considerations are
important. But why does it matter in a device that is
Actually, most modern FFs are hardened against metastability so often a
single synchronizer will do especially if it is feeding a synchronous
circuit.
David
On 3/25/13 1:56 PM, Attila Kinali wrote:
On Mon, 25 Mar 2013 06:56:30 -0700
Tom Van Baak t...@leapsecond.com wrote:
I think with
On Mon, 25 Mar 2013 18:56:34 +0100
Attila Kinali att...@kinali.ch wrote:
Because of this, the behaviour of the
counter is undefined and can lead not only to missing one count (which
would be caught by the PI control loop as additional noise), but the output
of the D-flip flops in the counter
Hello,
I am deeply affected by Brookes Shera' s death.
Years ago I had only a few mail-contacts with him and he's been very
helpful and friendly.
I believe that he would have assisted to introduce improvements and
further details in his design if he would have been able to.
He did provide me
On Mon, 25 Mar 2013 09:23:21 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
On Mon, Mar 25, 2013 at 6:36 AM, Jim Lux jim...@earthlink.net wrote:
The algorithms are well known and understood, and not very complex. Perhaps
starting from scratch wouldn't be a bad thing if you're going
Ie the output of the counter becomes
(more or less) random. Which in turn means the lower 4 bit of the
input to the PI control loop are wrong[1]. Or in terms of time, we
might be off by +/-2^4*42ns=672ns, which is a major hit against the
PI loop (like knocking it with a sledge hammer).
But
On Mon, 25 Mar 2013 14:03:23 -0400
David McGaw n1...@alum.dartmouth.org wrote:
Actually, most modern FFs are hardened against metastability so often a
single synchronizer will do especially if it is feeding a synchronous
circuit.
I would not count on that. Most 74xx that hobbyists use are
On Mon, 25 Mar 2013 11:18:06 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
Ie the output of the counter becomes
(more or less) random. Which in turn means the lower 4 bit of the
input to the PI control loop are wrong[1]. Or in terms of time, we
might be off by +/-2^4*42ns=672ns,
There is a company Death Switch which offers a service which sends out an email
or multiple emails upon your demise or incapacitation
The basic idea if you keep sending the service keepalives it does not send the
email. Sort of like a dead mans switch on a locomotive
Sent from my iPhone
On
Minimum clock width is not the window for metastability. That is
usually 10s to 100s of picoseconds.
On 3/25/13 3:20 PM, Attila Kinali wrote:
On Mon, 25 Mar 2013 11:18:06 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
Ie the output of the counter becomes
(more or less) random.
There are essentially 4 clock domains in the circuit
1) PPS
2) Divided down 10MHz (~300kHz)
3) 24 MHz
4) The microprocessor internal clock ( the micro probably has internal
synchronisers for at least some external inputs).
Depending on internal delays and jitter this may be regarded as
On Mon, Mar 25, 2013 at 12:20 PM, Attila Kinali att...@kinali.ch wrote:
The PPS signal is not sent direct to the 74HC4520. The PPS first
drives Phase Detector 3 that is built into the 4046 chip. this is
an RS flip flop. Notice it is RS3 OUT that drives the 4520.RS3
uses both the PPS signal
I have version 1.34a that he sent me in 2008. In light of his wishes,
please contact me directly if you would like a copy.
David
On 3/24/13 7:12 AM, Stephen Tompsett (G8LYB) wrote:
Here's a copy of the source package (that claims to be for version
1.28) that he sent me when I enquired about
Hi
The gotcha with using the XO as a spreading source is the hanging bridge
issue. As long as temperature (or what ever) is constantly changing the XO all
the averaging stuff works out. A GPS with a sawtooth output (and no correction)
is doing the same thing. The problem comes in when the XO
As to the latest code Brooks did not release compiled or ASM code. Prior
codes where released with an agreement. In due time his wife Karen Stoll will
make a decision that will satisfy time nuts.
Stay tuned.
Bert Kehren
In a message dated 3/25/2013 6:13:56 P.M. Eastern Daylight Time,
Hi Tom,
In the Shera design the instability of the XO timebase is
a key factor in improving the 30-second update resolution.
With the XO drift varying the sample point across the 1PPS
and 312.5 KHz edges the samples are constantly varying and
the average of the samples has a resolution much
Richard H McCorkle wrote:
Hi Tom,
In the Shera design the instability of the XO timebase is
a key factor in improving the 30-second update resolution.
With the XO drift varying the sample point across the 1PPS
and 312.5 KHz edges the samples are constantly varying and
the average of the samples
Hi
Using the GPS sawtooth as a source of randomness is dangerous. It can stop
moving for minutes at a time if the conditions happen to be just right (or in
this case wrong). Of course lack of randomization isn't your only problem when
this happens. The (likely substantial) offset in the data
Bob,
You are preaching to the choir and although Brooks felt that
using an XO and asynchronous gating to improve the resolution
was sufficient and GPS sawtooth correction was not needed with
the long averaging times in his controller that doesn't mean
that I agreed. The early work I did just
On Sun, Mar 24, 2013 at 4:12 AM, Stephen Tompsett (G8LYB)
step...@tompsett.net wrote:
Here's a copy of the source package (that claims to be for version 1.28)
that he sent me when I enquired about it many years ago.
That's great. It needs to be some how linked to an archive of his
article. No
measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Brooks Shera
On Sun, Mar 24, 2013 at 4:12 AM, Stephen Tompsett (G8LYB)
step...@tompsett.net wrote:
Here's a copy of the source package (that claims
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Uh WTF. I am preserving his legacy.
-Original Message-
From: WB6BNQ wb6...@cox.net
Date: Sun, 24 Mar 2013 16:38:06
To: li...@lazygranch.com; Discussion of precise time and frequency
measurementtime-nuts@febo.com
Subject: Re: [time-nuts] Brooks Shera
Really ?
Well li
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I wanted to build a GPSDO using the Brooks Shera design since I read the
QST article. I asked him in Jan 2009 about his source code, because I
wanted to change the PIC to a more modern one and add some
functionality, and his response was that he already had changed it to a
16F876A and added a
On Sun, Mar 24, 2013 at 7:34 PM, EB4APL eb4...@cembreros.jazztel.es wrote:
I wanted to build a GPSDO using the Brooks Shera design since I read the QST
article. I asked him in Jan 2009 about his source code, because I wanted to
change the PIC to a more modern one and add some functionality
Another great ham passes on, I'm sorry I never had a chance to meet him.
Is the GPS controller that Brooks published still useful today, or has it been
superseded by something newer? I have a Motorola GPS receiver (PVT-6) with 1
pps output, and an HP oscillator (model number escapes me at the
Sad news. I wonder if his web pages will survive him. If not, the
Internet Archive has archived the information. The latest is at:
http://web.archive.org/web/20120823060601/http://www.rt66.com/~shera/
Joe Gray
W5JG
On Sat, Mar 23, 2013 at 1:48 PM, ewkeh...@aol.com wrote:
Brooks Shera passed
Bert,
On 03/23/2013 08:48 PM, ewkeh...@aol.com wrote:
Brooks Shera passed away last Saturday. There will be an obituary published
tomorrow in the Santa Fe New Mexican. It should also be available online.
As I have mentioned in the past I credit him with making available to time
nuts, radio
On Sat, Mar 23, 2013 at 1:41 PM, Joseph Gray jg...@zianet.com wrote:
Sad news. I wonder if his web pages will survive him. If not, the
Internet Archive has archived the information. The latest is at:
http://web.archive.org/web/20120823060601/http://www.rt66.com/~shera/
The webarchive seems to
Bert,
Sorry to hear that. He was very kind to help me with my first 'Shera Board'
with parts and helping to get it up and working with an HP 105B. I wrote a
note to his wife a couple of months ago.
I agree with your thoughts. He went out of his way to help a stranger and I
appreciate it.
Joe
@febo.com
Subject: Re: [time-nuts] Brooks Shera
On Sat, Mar 23, 2013 at 1:41 PM, Joseph Gray jg...@zianet.com wrote:
Sad news. I wonder if his web pages will survive him. If not, the
Internet Archive has archived the information. The latest is at:
http://web.archive.org/web/20120823060601/http
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If its windows XP or earlier the password is recoverable. I use a boot cd
that exposes all. Its been helpful.
Is there a way to reach out and offer help aside from snail mail?
Would she be open to that help?
Regards
He worked at LANL. Might be other stuff in there...
On Fri, Dec 21, 2012 at 9:15 AM, paul swed paulsw...@gmail.com wrote:
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If its windows XP or earlier the password is recoverable. I use a boot cd
that exposes all.
If needed, I can provide some local help. Karen's address is a
short drive from my home.
Kevin
On Dec 21, 2012, at 7:15 AM, paul swed paulsw...@gmail.com wrote:
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If its windows XP or earlier the password is
Ditto on that. I'm up in Los Alamos. Getting into computers is my
specialty.
-Bob
On Fri, Dec 21, 2012 at 7:29 AM, Kevin Rosenberg ke...@rosenberg.netwrote:
If needed, I can provide some local help. Karen's address is a
short drive from my home.
Kevin
On Dec 21, 2012, at 7:15 AM, paul
I will contact her and see mybe she may also need help to dispose of
hardware and we can arrange a sale.
Bert
In a message dated 12/21/2012 9:15:56 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If
I have send an email and will find out what help she would accept, but
there is time when a snail mail is very powerful, and I again encourage all of
you to take the time to write a snail mail note. Maybe he can still
recognize it, but putting my self in Karen's place it will lighten her
I just had this same problem, a computer owned by some one who had
passed away. One dose not even need to know or recover the password.
Simply remove the hard drive and place it on another computer and you
will have access to all the files, copy over what is needed, re-format
the drive, then put
On 21 December 2012 18:11, Chris Albertson albertson.ch...@gmail.com wrote:
I think whatthis says is that if you've worked hard to make a design
available to others and you don't intend to sell it commercially,
PUBLISH the details, the design files and the source code. Yes I
kknow it is
Kind of defocusing here. I think the thread is about possibly helping to
release the shera v4.02 software. Several folks appear to be local to
Brooks wife and may be able to help her recover information she may need in
general and if we are lucky allow the software to be at least gathered.
Regards
And folks, please respect Brooks' privacy -- remember that this list is
archived in many places on the web.
John
paul swed said the following on 12/21/2012 04:06 PM:
Kind of defocusing here. I think the thread is about possibly helping to
release the shera v4.02 software. Several folks
John
I send my posting to Mrs. Stoll for approval prior to posting. Lets try
not to start the usual arguments. Brooks deserves better.
Bert Kehren
In a message dated 12/21/2012 4:28:38 P.M. Eastern Standard Time,
j...@febo.com writes:
And folks, please respect Brooks' privacy --
In message CANX10hAW2Ad0w=_mnvoijnej4_fm0tnwkejohd7n154_jbw...@mail.gmail.com
, David Kirkby writes:
On 21 December 2012 18:11, Chris Albertson albertson.ch...@gmail.com wrote:
That said, some of the code that people release, and gets
circulated annoys me. Take a look at this unix
Some how time nuts combined two lines it is
Karen Stoll46 Crazy Rabbit Rd Santa Fee, NM 87508
In a message dated 12/19/2012 3:55:33 P.M. Eastern Standard Time,
ewkeh...@aol.com writes:
Brooks Shera has been a major contributor with his GPSDO. Before Tbolts
where
Bert
Thank you for reaching out to Brook and his wife. I agree that the QST
article that Brook wrote really did change the capabilities that Amateur
time keepers and Radio Operators have access to. I am very sad to hear the
reason why he has been un-responsive.
Thanks again for sharing this sad
The 1998 Shera QST article was also my first reading about GPSDO. In 1999
we were using the Epsilon OEM board GPSDO from Temex for the first
terrestrial DVB single frequency network trials.
On Wed, Dec 19, 2012 at 10:33 PM, paul swed paulsw...@gmail.com wrote:
Bert
Thank you for reaching out
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
David Hopkins wrote:
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I had an email reply from him a couple of months ago. Reply was less
than 24 Hours.
A couple of weeks ago I needed a PIC for his
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Brooks Shera
David Hopkins wrote:
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I had an email reply from him a couple of months ago. Reply was less
than 24 Hours.
A couple of weeks ago I
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Peter Lacey wrote:
The source is at:
http://www.leapsecond.com/pages/ppsdiv/?C=N;O=A
Peter Lacey
AA1ZU
I have seen that code before. I believe that is simply a divider by TVB.
The code I was asking about is the code
PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rex
Sent: Wednesday, October 03, 2007 5:35 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Brooks Shera
David Hopkins wrote:
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I had an email
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I have seen that code before. I believe that is simply a divider by TVB.
The code I was asking about is the code Brooks Shera wrote for his GPS
disciplined controller. It implements a lot more number crunching, I think.
I think I have tried pretty much every suggestion everyone has given me, and
probed every pin I was told to. If I had a digital storage scope life would
be much easier, but I'm doing the best I can with what I got.
Still trying to track down my problem, it seems like the counter at U4 is
Checked both U1-2 U2-1, I am getting the 5 MHz / 0 to 5V square wave. It's
not the nicest looking, but my counter reads it fine. Maybe this could be a
problem?
http://www.rabel.org/archives/Images/Misc/5MHz_Square.jpg
Yes, U3-15 has the GPS PPS pulse, I can't see it on my scope but I can see
Checked that today, getting 315.5KHz (AA Board - P3 pins 12 jumpered).
I pulled all the chips, just to make sure I didn't have any bent/broken
pins. Reflowed every pin on the board so there would be no doubt in my mind
that there were any bad joints. Replaced chips Same problem I've been
Jason,
What divider output are you using? The typical input to the phase detector
should be between 312.5KHz and 625KHz and an appropriate jumper has to be
installed on the divider header on the [EMAIL PROTECTED] board to tie the
selected divider
output to the phase detector. Sounds like you
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Brooks Shera GPS Controller Help
First, take your OXCO, heat it up, and use just a pot for the 0 to 6
volt control range. Find out what control voltage is needed for the
proper frequency. The DAC can't achieve lock
else.
Jason
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill Hawkins
Sent: Monday, January 15, 2007 6:58 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Brooks Shera GPS Controller Help
First, take your OXCO
90 matches
Mail list logo
