My numbers were:
W1AW (40 m band): 7038806.3 Hz
(1.4 Hz higher than the official reading)
WA6ZTY: 7028351.5 Hz
(0.03 Hz higher than the official reading)
I only submitted readings to the nearest 100 mHz (that is, 0.1 Hz),
as I didn't think my measurements supported more
Stephan
--snip--
I prefer phase detectors which is more continous such as mixers, XOR or
S-R style phase detectors.
In this case the phase detector is purely digital so I guess the loop filter
could also be a purely digital IIR filter (or something?) I guess the only
limitation is the
Hi,
I have an old soekris net4521 board which I would like to reconfigure
as a GPS referenced NTP server
I have been looking at the pages the PHK has up on bot the soekris
projects and on nanoBSD and also
http://www.febo.com/time-freq/ntp/soekris/index.html
however I need some help with the
Brendan Minish said the following on 12/29/2006 09:11 AM:
I have an install of freeBSD6.1 running in vmware to use as a build
staging platform and I think I can manage the custom kernel build
(although a peek at someone else's config would be useful.) etc
i have also manged to get nanoBSD to
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
Brendan Minish said the following on 12/29/2006 09:11 AM:
I have an install of freeBSD6.1 running in vmware to use as a build
staging platform and I think I can manage the custom kernel build
(although a peek at someone else's config
On Fri, 2006-12-29 at 15:25 +, Poul-Henning Kamp wrote:
The code size depends how much of FreeBSD you disable in the nanobsd
build.
Hi Poul
Can you give me some pointers as to what I should be disabling.
I have been following the example here
In message [EMAIL PROTECTED], Brendan Minish wri
tes:
Hmm, I have my beady eye firmly on the 128Mb one that's sitting on my
desk! is that an unrealistic goal if I am willing to forego the in place
upgrade feature
128Mb is quite challenging, the smallest I have worked with (as opposed
to played
I just picked up a 5345A from eBay. This unit has a 10811 oscillator instead of
the 10544 depicted in the manuals I have. The serial number has been removed.
Does anyone know if there is an EFC adjustment for this counter or is the
course control the only way of setting frequency?
Colin
The 5345A does not have a EFC adjustment, so your only option is the
frequency adjust pot on top side of the 10811 oscillator.
Greg
- Original Message -
From: Colin Bradley [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Friday, December 29, 2006 11:01 AM
Subject: [time-nuts] HP 5345A
I
I don't know if this has been posted yet, or even if this is the best
place to get the latest version of this excellent tutorial from John
Vig, but here is a link to his tutorial on quartz crystal technology
atomic frequency standards:
I think that is the most current, from last years PTTI tutorial disk, with
his retirement, I do not foresee any major updates to appear.
Raimond Melkers
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Bill Powell
Sent: Friday, December 29, 2006 12:45
John Miles wrote:
There's no manual fine-tuning adjustment on the 10811A, which is something
I've always found strange. The trimmer that is present is arguably far
too
coarse. I've owned 10811As that would stay put within a couple parts in
1E-10 per year, but setting them to that degree of
Colin Bradley wrote:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have. The serial number has
been removed. Does anyone know if there is an EFC adjustment for this
counter or is the course control the only way of setting
Mike Suhar said the following on 12/29/2006 02:32 PM:
I used an HP 3586C Frequency Selective Voltmeter with the tracking generator
looped back to the RF input via a step attenuator. The audio output went to
the PC. An ICOM IC-745 was tuned to the 160M signal to hear the test
announcements
The HP 5328A that I have uses the EFC as a fine manual adjust. There is an
accessory card that accepts the oscillator and the supporting fine
manual-adjust circuitry is located there.
Bill, K8CU
- Original Message -
From: Rick Karlquist [EMAIL PROTECTED]
To: Discussion of precise time
No; per year. The 10811(D?) in a late-model 8662A I owned a few years ago
was a serious outlier. If I remember correctly, it was about 3E-10 off
after being left on for a year. I'll never find the notes I kept on it now,
but it was definitely better than 1E-9.
1E-7 adjustment precision, if
I didn't enter the FMT due to the lack of an HF antenna, but my original
plan was to downconvert the signal with a GPS-locked LO, then run it through
a logamp and a very narrow CW filter and straight into my 5370B without any
demodulation at all. As long as there were no interferers within the CW
John Miles said the following on 12/29/2006 03:24 PM:
Does the 3586C have an AGC-controlled IF output? A BFO synthesizer would be
a good idea, but it might not be necessary if you can filter and measure the
IF directly.
It has an IF output as well as a built in counter with 0.1 Hz
Boxes such as the 105A/B (and others) use the EFC as a fine manual frequency
adjustment.
For boxes without EFC manual adjustment, it's possible to set the 10811 to
3E-10 or better if you're careful and willing to go through a few iterations
over a few days. At time of performance check (of boxes
John Miles wrote:
No; per year. The 10811(D?) in a late-model 8662A I owned a few years ago
was a serious outlier. If I remember correctly, it was about 3E-10 off
after being left on for a year. I'll never find the notes I kept on it
now,
but it was definitely better than 1E-9.
It
It probably wandered around much more than that during the year and
you just happened to measure it when it was close to the starting
point. Kind of like the broken clock that keeps perfect time every 12
hours. In any event, I can safely say, having looked at thousands of
10811's, that I
I don't recall; this oscillator was installed in a piece of gear I sold
several years ago. I checked it every few months while I had it. All I
remember is that the note I used to keep track of its calibration had at
least four entries on it at the time I sold the generator, and I'm very sure
it
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both directions?
This is probably on the list of the 10 greatest myths about
crystal oscillators. Many decades ago, there were systematic
aging effects such
In message [EMAIL PROTECTED], Rick
Karlquist writes:
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both directions?
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
--
Poul-Henning
What's the Y-axis on that graph? Parts in 1E-9?
-- john, KE5FX
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
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In looking at the manual for the 5334A/B, the oscillator support board has a
trimmer (R5) that could be used for EFC control of the 10811A. Too bad that HP
did not use EFC (or an internal FINE control) to set frequency on this great
unit in more of there instruments
Colin
In message [EMAIL PROTECTED], John Miles writes:
What's the Y-axis on that graph? Parts in 1E-9?
Yes. n for nano.
It's an ISOTEMP OCXO 131
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
___
time-nuts mailing list
From: Rick Karlquist [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP 5345A
Date: Fri, 29 Dec 2006 14:39:09 -0800 (PST)
Message-ID: [EMAIL PROTECTED]
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both
Hi Rick:
Is there a way to know about the type of aging up front. For example
what crystal makers have only micro cracks as the aging mechanism? For
what starting date? My guess is that there are plenty of crystals that
have aging that's mainly due to contamination or other causes that the
They probably assumed that most hardcore users would lock the counter or
generator to a house standard anyway. (You might point out that only
hardcore users would have paid $15,000+ for a 5345A, but the practically-new
one that I just bought was owned by the New Jersey State Police!)
It's
On Fri, December 29, 2006 19:01, Colin Bradley said:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have. The serial number has
been removed. Does anyone know if there is an EFC adjustment for this
counter or is the course
There is probably nothing wrong with it. Two things to check: first, the
lock range is super-narrow. Make sure that the 10811s are very close to
each other using the manual trimmer(s). For the same reason, both OCXOs
will need to warm up for a few minutes.
Second, the 5345A needs an
Brooke,
I foresee a discussion similar to those of wine connoisseurs.
What is the maison and vintage of the crystal? Was it
found on the upper or lower slope of the hill? Who cut it
and when and how? Is it properly contained?
What do the critics (with finer equipment than mine) say
about the
I recently picked up a TCXO from Murata, part No. OC2545DT-1000. I assume it is
a 1MHx XO. Quite small in size fully sealed square metal case, with 8 pins
arranged as 2 sets of 3 pins and 2 single pins.
Would anyone have any data, even just pin-outs for the device as pictured.
Did a google
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