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Hi Warner there have been queries asking for Rycoms on the LWCA message
board and reflector I will risk your wrath and forward a posting there for
you
Regards
Alan G3NYK
- Original Message -
From: M. Warner Losh <[EMA
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I presume it has a calibrated delayed TB how about using that ??
Alan G3NYK
- Original Message -
From: "Brooke Clarke" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, Octob
function the window time base can be no more than 10X faster than the main
> trace which would be 20 ms/sq, way too slow to see the pulse.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.precisionclock.com
> http://www.prc68.com/I/WebCam2.shtml 24/7 Sky
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Hi Tom I dont think you need the resistors these are current limited and the
sense is inside the chip so the resistors dont do anything (you are thinking
of a negative feedback effect). All that happens in paralled operation is
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Hi Didier, you will find a lot of information on small LF antennas on the
Long Wave Club of America site www.lwca.org look in particular for an
"active" voltage probe antenna by Roeloff Bekker PA0RDT. This is proving
quite resi
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Hi All, I know this unit is aging a bit and there are probably better ways
of comparing standards in 2007 but I have this "Frequency Comparator Model
100-7" by Montronic Inc sitting in my rack. In essence it is similar to the
Tr
Berndt I believe you are describing a "Triax" connector I found them through
Trompeter but I believe they are sold by Farnell and RS Components in the
UK. The same connector was used I think on some of the HP system digital
voltmeters.
Cheers de Alan G3NYK
- Original Message -
From: "Bernd
Hi John, Andy Talbot G4JNT developed the a Jupiter based GPSDO for just this
purpose, several are used by hill-toppers in the UK.
http://www.scrbg.org/g4jnt/freqlock.htm
The idea was that it would settle and be accurate in the time it took to
seet up the microwave part of the station.
I hope that
There is also a battery handheld unit by Racal Dana which will trigger and
display captured bus transactions. Also the function is on some logic
analysers. I have low end BlackStar LA that has an IEEE-488 "personality
card"all acquired cheaply on "that auction site"
Alan G3NYK
- Original M
Hi Nic these are difficult to find for free but Ridge Electronics have one
for Tracor 895 at $20. I just got a Montronics Freq Diff meter manual from
them.
Alan G3NYK
- Original Message -
From: "Nic McLean" <[EMAIL PROTECTED]>
To: "'Discussion of precise time and frequency measurement'"
Hi, I dont know about other counties but the oad shedding is certainly still
dont this way in the UK, BUT the incremental frequency adjectments are
corrected for the mean daily frequency to be correvt at 06:00 in the
morning so that all the clocks read correctly and we get to work on
time!! Des
Hi All, all the comment has been about in-line protectors so far. We in the
UK do dot have the ferocity of lightning that is seen in some parts of the
USA but surely like all problems "prevention" is better. It is probably not
100% but would it not be better to have a higher metal rod say 6 feet ab
It does not matter how many references you build you will never know how
good they are. There can only one judgement "goodness", and this is
comparison with the national standard. You reference may even be "better"
that a national standard but must be judged against the national standard.
Most coun
Mm LED operation is basically a bulk effect whereas the reliability of
transistors depends more on surface effects.
In 1960 AT&T chose to go with Germanium, but the British Post Office chose
the new silicon planar technology for future submerged cables. Previously Dr
Gilbert Metson had written
Hi Didier yes trawlermen's axes are a worse problem than anchors !! I have
seen a pic of the remenants of an axe head with a large chunk taken out of
it. The fisherman survived but was a bit shaken ! Of course the cut was made
near the end on the continental shelf so the volts were quite high!!
Al
cross-boundary view of projects).
Alan G3NYK
- Original Message -
From: "Neon John" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, May 01, 2008 9:46 PM
Subject: Re: [time-nuts] sub cables
> On Thu, 1 May 2008 11:1
Hi Robert in the days before TTL dividers there were quite a few vert low
frequency cuts. I think that one is a flexural bar designated "NT cut". I
have also seen crystals of lower than that made in the "gapped ring" format
which oscillate a little like a tuning fork. ( I think I have seen one of
t
Thanks for your efforts John it shows how interesting it is as there were
queries very soon after that !!
Best Wishes
Alan G3NYK
- Original Message -
From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
; <[EMAIL PROTECTED]>
Sent: Wedne
Bill, I bought an original manual from Ridge last year for a Montronics
Model 100 Frequency Difference meter, at very reasonable cost despite post
to the UK from Ridge Equipment, and I have just found, and bought, a copy of
the Fluke 100-7 which I am presuming was a "bought in" design from
Montron
On the 4th July it (the Sun) was actually at its furtherst point from earth
so we were getting less radiation .did your burghers take longer to cook
?? :-))
Alan G3NYK
- Original Message -
From: "Chuck Harris" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurem
Hi Dave Rapid Electronics in Colchester do SMBs the eaiest way to get
200 ohms might be 2 by 100ohm in series..though it wont fit a ready made
1206 size pcb :-((
www.rapidelectronics.co.uk
or www.rapidonline.com is one they quote now I think both work.
I dont think you will get 74ACs there th
Hi Ian I dont know whether it works for that unit, but try the Hameg site.
http://www.hameg.com/66.0.html
There are "almost" complete manuals for all the units (well certainly the
scopes!) You may find that there are no schematics in the English
versionsdownload the German versions (which you m
downloaded the operating manual a while back.
> Tried your tip and looked at the German version, but no luck either.
>
> Thanks for the suggestion though.
>
> Cheers,
>
> Ian.
>
> - Original Message -
> From: "Alan Melia" <[EMAIL PROTECTED]>
> T
Hi all, in the process of setting up a GPS time standard for a Radio
Astronomy facility (amateur) we installed a GPS receiver in a small cabin
with a translucent roof, thinking that would not impede the GPS signal.
After a lot of head scratching as to why we were not getting the performane
we got
- Original Message -
From: "David Ackrill" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, August 10, 2008 8:30 AM
Subject: Re: [time-nuts] GPS shielding by power lines?
> Alan Melia wrote:
> > Hi all, in the pr
Hi Tom Brilliant I hadnt thought of the fields actually affecting the
operation of the electronics! that is certainly something that might be
interesting to check. I note there lines have three "phase" feeds but no
neutral wire so they must use ground as the return path to any unbalance
currents.(?
Hi Didier, thanks for that idea, yes they were all "pucks" all Garmin two
intended for marine use and one was a old Garmin GPSIIplus with a mag
"puck". I have a Trimble Palisade that I have not got round to working on
yet, but I understand that there are problems putting this version into NMEA
mod
Hi David yes indeed and the qualify of the fix imporves as we move away at
right angles to the linedespite some trees and a tall hedge on one side.
Dramatic and quite repeatable.
Alan G3NYK
- Original Message -
From: "David McGaw" <[EMAIL PROTECTED]>
To: "Discussion of precise time and
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