Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found an Oncore
M12+ timing GPS is available pretty cheap from Hong Kong, so that's my plan.
Years ago, I remember smiling when I figured out that I could
John,
Besides the M12 receiver you will need an interface board to provide a 3.3 volt
regulator for the M12, a 5 volt regulator and some 74c04's or some such to
provide the 1pps interface and drive levels to a MAX232 chip for a RS232
interface. Then you will need to build up the Brooke Shera
John,
One other thing I forgot to touch on. The 1pps signal out of the a GPS receiver
is very jittery. For your TCXO it will be good enough except for you having to
stare at the scope while comparing the GPS to your TCXO. Any oscillator of
higher quality will be a problem when just using the
Fleming was perfectly located, in spite of himself, the problem of all groups
and clubs in the world. There is always an imbalance between theory, practical
experience and implementation. There are always good advice, but hardly any
solutions. I invite us all to use most of the iron to finish
On 02/17/2011 01:58 AM, beale wrote:
Hello time enthusiasts! I'm hoping for your advice on my (perhaps modest, by
this list's standards) project.
I would like to make a frequency calibration of a 10 MHz oscillator to 1 ppm
(1E-6) or better, using some basic equipment. I do not have a GPSDO
David Taylor wrote:
Have you heard anything from Garmin? I take it you have reported the issue.
I have only received an automated reply from the Garmin site so far David:
Category Or Device: GPS 18 Serial
Problem Description:
I
It sucks, but they may only have a small qty of the spares, and they keep them
for those customers who paid full price.
However, I agree about the high price. That would be better than go away
Didier KO4BB
Sent from my Verizon Wireless BlackBerry
-Original Message-
From:
David Taylor wrote:
Have you heard anything from Garmin? I take it you have reported the
issue.
I have only received an automated reply from the Garmin site so far
David:
[]
Regards, Geoff (NZ).
In the absence of a further reply, may I suggest that you report the
problem directly to
Or you try all the possible solutions all at once in parallel in a big FPGA and
you have instant synch (at least in the time it takes to recognize you have it)
May be impractical for very long, complex sequences...
Didier KO4BB
Sent from my Verizon Wireless BlackBerry
-Original
Hi
The key item here is that the system is going to work via amateur radio here in
the US. The FCC only lets you use three very specific PN sequences. The three
are called out explicitly in the rules. The requirement that they not be reset
while transmitting except by feedback is also called
On 02/17/2011 12:42 PM, shali...@gmail.com wrote:
Or you try all the possible solutions all at once in parallel in a big FPGA and
you have instant synch (at least in the time it takes to recognize you have it)
May be impractical for very long, complex sequences...
Modern quick-lock
A while ago, I took a pair of watches (a Bulova and a Seiko) that needed new
batteries to a fancy jewelry store here in town (VanDeGriff) because I thought
they would do a good job.
The Bulova took 6 weeks... (They apparently did not service anything locally
and had to sent it out). They said
Precisely because most of us do not have access to much fancy test equipment (I
am one of the lucky ones), there is no excuse for not using freely available,
quality tools (assuming that you have a computer) like LT Spice.
Of course, you have to be careful as the quality of the output from any
Wow this is a real time-nuts C standard.
It has all the Right Stuff. Power, heat, and weight and if I had to guess
the smell of baking phenolic and such. Someone would actually believe this
is a standard. Not the modern day wimpy things we use that you can lift with
1 or 2 hands. Heck its VCO is
A great way to get that National manual :-). I've sent Dave manuals in the
past and have always got them back in the condition I sent them in. Since
I have access to a paper knife I've had the spines sheared off before sending.
-pete
On Wed, Feb 16, 2011 at 9:06 PM, John Miles jmi...@pop.net
I am trying to stay within the FCC Part 97 rules. The spreading or hopping will be of a
narrowband (25 KHz BW) FM signal. I haven't decided on either the FHSS or DSSS approach.
I had thought of a FH approach that exploited time of day to address a frequency look up
table, but I think that is
On Wed, Feb 16, 2011 at 11:43 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Would you count these as nearer a working system? Only needs USB power,
and includes the antenna and cable.
http://www.sureelectronics.net/goods.php?id=99
I'm still waiting for mine to arrive.
The
Hi
There is another route to getting where you want to go.
Buy an atomic clock. If you spend some time shopping, telcom rubidium atomic
clocks are out there for sub $50 prices. For $100 you can get one quite
quickly. An Efratom LPRO is one example. There are many others.
They normally put out
On 2/17/11 3:42 AM, shali...@gmail.com wrote:
Or you try all the possible solutions all at once in parallel in a big FPGA and
you have instant synch (at least in the time it takes to recognize you have it)
May be impractical for very long, complex sequences...
If the sequence is long, then
On 02/17/2011 12:23 PM, shali...@gmail.com wrote:
It sucks, but they may only have a small qty of the spares, and they keep them
for those customers who paid full price.
Full price?
Someone payed full price for it originally. The notion that can have
control over who owns it later is
On 2/17/11 7:22 AM, Joe Leikhim wrote:
I am trying to stay within the FCC Part 97 rules. The spreading or
hopping will be of a narrowband (25 KHz BW) FM signal. I haven't decided
on either the FHSS or DSSS approach. I had thought of a FH approach that
exploited time of day to address a frequency
On 2/17/11 9:30 AM, Bob Camp wrote:
Hi
System design is always about compromise.
If you hop slowly, you stomp on each channel pretty hard. You are likely
to get noticed when you do. The idea is to stomp so rarely and for so short
a time that you aren't noticed.
If you hop fast, you need to
As an aside to the watch repair business, a large number of brands
primarily Swiss, will no longer supply parts to watchmakers. This has
become a big issue among the independent watch repairers in the US. It
really is an issue of restraint of trade but is currently unresolved.
Though not
hate say it.
Time for the $3 timex
On Thu, Feb 17, 2011 at 2:21 PM, Bill S w...@jbpet.com wrote:
As an aside to the watch repair business, a large number of brands
primarily Swiss, will no longer supply parts to watchmakers. This has become
a big issue among the independent watch repairers in
$12 inflation.
-John
=
hate say it.
Time for the $3 timex
On Thu, Feb 17, 2011 at 2:21 PM, Bill S w...@jbpet.com wrote:
As an aside to the watch repair business, a large number of brands
primarily Swiss, will no longer supply parts to watchmakers. This has
become
a big
I wanted to say those customers who bought them new directly from them
While I do not agree with the practice, many companies treat their primary
customers better than those who buy aftermarket.
What is relevant is what the vendor believes is relevant. What you and I think
about it IS
I've had such blowoffs from SRS, simply asking for a schematic of an old
power supply. Uncooperative and unhelpful is a total understatement.
I will never buy any of their stuff again. I simply don't care if it is
the best in the world (which it is probably not the case), if the
documentation and
I've worked for Fortune 100 companies (let alone the top 500) and start-ups.
They both often buy used gear. Even if the gear breaks and needs repairs, there
are accounting reasons why buying used makes sense. (Repairs are expensed. Bean
counters like that.) Thus to screw anyone that buys used
Hi,
HP sels (sold?) refurbishes instruments also.
Henk
Op 17 feb 2011, om 22:28 heeft li...@lazygranch.com het volgende geschreven:
I've worked for Fortune 100 companies (let alone the top 500) and start-ups.
They both often buy used gear. Even if the gear breaks and needs repairs,
there
Hi
Back a while Motorola bought up all the used two way gear they could via the
trade in process. Every single piece of it went to the crusher, no
exceptions for anybody. Very much in warranty or 20 years old, to the
crusher it went. The practice made them few friends, but it apparently made
I would just like to point out that SRS is one of the few companies who
still provide complete manuals with parts lists and circuit diagrams
(although circuits are only in the paper manuals, not the pdfs).
Regards,
Laurence Motteram
-Original Message-
From: time-nuts-boun...@febo.com
On 02/17/2011 10:55 PM, Laurence Motteram wrote:
I would just like to point out that SRS is one of the few companies who
still provide complete manuals with parts lists and circuit diagrams
(although circuits are only in the paper manuals, not the pdfs).
They can actually deliver paper
Not unless you are the original purchaser, and can prove it. Contrast to HP.
-John
==
I would just like to point out that SRS is one of the few companies who
still provide complete manuals with parts lists and circuit diagrams
(although circuits are only in the paper manuals,
li...@rtty.us said:
The key item here is that the system is going to work via amateur radio here
in the US. The FCC only lets you use three very specific PN sequences. The
three are called out explicitly in the rules. The requirement that they not
be reset while transmitting except by
Better yet, HP has a ftp site with old manuals.
HP (Agilent) isn't what it used to be, but I suspect it has its share old
timers that at least try to keep the old HP spirit alive.
-Original Message-
From: J. Forster j...@quik.com
Sender: time-nuts-boun...@febo.com
Date: Thu, 17 Feb
jleik...@leikhim.com said:
3) If I block the 1 PPS during PTT, and the receiving end asserts 1 PPS
reset, will synch be lost? If not how effective will the freewheeling be
during a 30 second exchange with 10 MHz GPS derived clock reduced to 20 hops/
second?
The receiver has to do the same
Stan;
Here is a source for the necessary tools:
http://www.ofrei.com/page557.html
Note that they are not inexpensive; something to factor in when you consider
the overall cost of maintenance.
If it really has been 20 years, there is every possibility that the battery has
leaked, in which
On Thu, Feb 17, 2011 at 3:22 PM, Hal Murray hmur...@megapathdsl.net wrote:
The receiver has to do the same dance as the transmitter. (Maybe delayed a
bit.) If not, you will be listening on the wrong frequency. Can you use
something like a carrier detect to suppress the reset on the receive
On 2/17/11 2:46 PM, Hal Murray wrote:
li...@rtty.us said:
The key item here is that the system is going to work via amateur radio here
in the US. The FCC only lets you use three very specific PN sequences. The
three are called out explicitly in the rules. The requirement that they not
be reset
Think long and hard before you try a 2 or 3 pronged wrench
on your 6 slotted back. It is almost impossible to not slip
with the 2 prong wrench, and the 3 prong Jaxa style is not
much better.
The manufacturers sold little sheet metal wrenches that engaged
all of the slots in the back, and as
jimlux wrote:
you *could* call the FCC and ask them...
Or, just build whatever, and wait for someone to complain, and say you
misinterpreted the rules. Unless you're a jerk, I suspect that they
won't fine you or anything else.
Given the quality of the rank-and-file ham, and the fact that
I am curious what software and version you are running with these.
On 2/17/2011 3:32 AM, David J Taylor wrote:
David Taylor wrote:
snip
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To unsubscribe, go to
From: jim s j...@jwsss.com
Sent: Friday, February 18, 2011 7:12 AM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Garmin 18x, new firmware Ver 3.60, NOT
recommended for Time Nuts!
I am curious what software and version you are running
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