I am wondering if this is a sustitute of the original oncore VP receiver for
the Z3801 -Z3805. (E-pay 281161070304 )
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Hi,
Ok, the 53131A trigger settings: I've turned auto trigger off and set it to
trigger at 2V (I think this is right, but I'll have to go and double check
the exact threshold setting) threshold. Sensitivity is set to high.
Location is GPS surveyed and all M12+'s are set to position hold mode.
I
Thanks for the spec. I suspected that it would be in that ball park.
The discrete transistor type amplifiers achieve around 120dB or more at
10MHz. But, they are a lot more effort to implement than the opamp designs.
I believe the transformer in this case is for ground loop isolation rather
than
Something that would be interesting to know is if certain opamps are better
suited toward S12 isolation than others. I guess at the expense of noise
floor and 1/f corner one could cascade two opamps to improve the S12
isolation further.
As soon as you are looking at frequencies of 100MHz you are
Hi,
I'm playing with dual-mixer time difference stuff again. And, came across
this and I find it somewhat puzzling since no one else seems to have
encountered it. Possibly because I'm missing something?
The doubly balanced mixers (of the type known to be used in DMTDs and phase
noise
Strange item... it has an M12+ and a supporting board full of
components. Protocol translation from 12-channel to 8-channel? The
link to the PDF file returns a 404.
On Fri, Nov 22, 2013 at 9:32 AM, Pascual Arbona Lopez
p.arb...@securimar.com wrote:
I am wondering if this is a sustitute of the
Stephan Sandenbergh wrote:
Something that would be interesting to know is if certain opamps are better
suited toward S12 isolation than others. I guess at the expense of noise
floor and 1/f corner one could cascade two opamps to improve the S12
isolation further.
The flicker noise corner
Stephan Sandenbergh wrote:
Hi,
I'm playing with dual-mixer time difference stuff again. And, came across
this and I find it somewhat puzzling since no one else seems to have
encountered it. Possibly because I'm missing something?
The doubly balanced mixers (of the type known to be used in
John,
We had a similar problem when we're trying to setup various antennas at
various locations pointing at different true North bearings. It turned out
quite hard to find true North.
We found single carrier GPS surveyed points to be inaccurate to produce
good bearings across such a short base
Hi
Something is going wrong somewhere. The question is where. Three ideas /
targets here:
The counter is a 100 ns (10 MHz input) beast, so it *might* be the issue.
The offset source or the GPS might also be the issue (thus avoiding 1/10.24
MHz).
The idea with the larger offset is that
Hi,
Thanks - mystery solved. This is one of the systems that I looked at,
and missed the DC block in the second amplification stage. I guess it is
possibly a large Ceramic 10uF. My bad.
Thank you for putting up those web pages I find them to be very good
references. I spent quite a lot of time
On 11/21/13 11:32 PM, Robert Atkinson wrote:
I'd also go for a compass if you want magnetic north, but then I have a good one, a
medium landing compass. Mine dates from WWII but they are still made
http://www.sirs.co.uk/ground/landing_compasses/patt2/landing_resource
These are used to align
Stephen -
[time-nuts] Crude Survey Technique
Thanks for describing your method. I am learning a lot. here is agovt web site
that will give the compass correction for any long and lat. Here in KS the
magnetic pole is about 2.3 degrees to the east.
Once all the ideas are in, I will put
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
-John
Stephen -
[time-nuts] Crude Survey Technique
Thanks for describing your method. I am learning a lot. here is agovt web
site that will give
Hi Jim,
I disagree, the Medium Landing Compass IS accurate to better than 30 minutes
(0.5deg). This is also the smallest graduation so it can be read to better than
15 minutes. The calibration chart is given to 10 minutes every 15 degrees. It
does of course indicate the orientation of the local
Stephan Sandenbergh wrote:
Hi,
Thanks - mystery solved. This is one of the systems that I looked at,
and missed the DC block in the second amplification stage. I guess it is
possibly a large Ceramic 10uF. My bad.
Thank you for putting up those web pages I find them to be very good
references.
Stephan wrote:
The discrete transistor type amplifiers achieve around 120dB or more
at 10MHz.
Well, SOME discrete transistor amplifiers CAN achieve 120dB or more
of reverse isolation, if everything is done properly. But 120dB or
more takes careful attention to detail at every step -- it is
Must have been Allen Bradley :)
Same problem here with military equipment!
On Thu, Nov 21, 2013 at 4:17 PM, Robert Atkinson robert8...@yahoo.co.ukwrote:
May be a bit of drift and reading back to front. Some years ago we bought
a quantity of moulded carbon compostion resistors from a top US
Link is good
Thanks again
On Fri, Oct 25, 2013 at 3:32 PM, Didier Juges shali...@gmail.com wrote:
In order to test my upcoming Thunderbolt Monitor, I developed a small piece
of software to allow me to generate controlled Primary and Supplemental
timing packets per the Trimble spec.
I think
On Friday, November 22, 2013, J. Forster wrote:
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
This is the simplest high-accuracy solution. Celestial navigation is your
friend.
A magnetic compass is the simplest solution.
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Stephan
Did you also notice that the AC coupling is done **after** the sine wave has
already been clipped by the previous stage (according to the schematic
note)?
This generally is not a good way to remove DC offset from a low level
'noisy' signal.
I doubt that Bruce was recommending doing
That's not the original gps rx.. (281161070304)
Careful what you get off yixun..
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Pascual Arbona Lopez
Sent: Friday, 22 November 2013 7:33 PM
To: Discussion of precise time and frequency
Hello and thanks to all for the great ideas.
Re: [time-nuts] Crude Survey Technique
Some interim comments:
*agree with regard to using pole star. However it is below freezing here and so
I won't be out in the dark with my camera. A good verification technique that
must await warmer
On the transite, I thought that might be an issue. You really need a
Theodolite. You can probably pick up a used Wild T-2 or Kern DKM-2 for not
a lot on eBay. A T-3 is o0verkill.
Asian Total Stations have pretty much killed the commercial marked for
manual survey instruments. The ones w/
On Thu, 21 Nov 2013 09:40:44 -0500, time-nuts-requ...@febo.com wrote:
time-nuts Digest, Vol 112, Issue 65
Message: 8
Date: Thu, 21 Nov 2013 06:40:14 -0800
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re:
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WarrenS wrote:
Stephan
Did you also notice that the AC coupling is done **after** the sine
wave has already been clipped by the previous stage (according to the
schematic note)?
This generally is not a good way to remove DC offset from a low level
'noisy' signal.
I doubt that Bruce was
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