Re: [time-nuts] softmark-usb-gpib

2007-09-24 Thread Dileep MG


Dear Sir,

I hope that you are in receipt of the information I sent you on Softmark 
USB-GPIB. Kindly advice, if you can help.


Have a nice day!

Thanking you,

Mathew George


From: John Fisher [EMAIL PROTECTED]
Reply-To: Discussion of precise time and frequency 
measurementtime-nuts@febo.com

To: time-nuts@febo.com
Subject: [time-nuts]  softmark-usb-gpib
Date: Thu, 20 Sep 2007 09:36:56 -0700

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 --

 Message: 5
 Date: Thu, 20 Sep 2007 12:45:58 +
 From: Dileep MG [EMAIL PROTECTED]
 Subject: [time-nuts] softmark-usb-gpib
 To: time-nuts@febo.com
 Message-ID: [EMAIL PROTECTED]
 Content-Type: text/plain; format=flowed

 Hi all,

 Will someone be able to give me some inputs on using usb-gpib interface 
from

 softmark?
 Information regarding coding with the ocx file which comes with the 
board,

 can be helpful.

 I thank you for the help, in advance.

 Mathew

Mathew,

I don't know that board, but the Prologix USB_GPIB is incredibly easy to 
use

and not too expensive. Drivers available for every OS too. Does your manual
say what the driver chip is? Where are you stuck? You will get a lot more
help with specific needs expressed...

Regards,

jack


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[time-nuts] FE-5680A pinout

2007-09-24 Thread Jose Manuel
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Stan, Rex and Peter,

Thak you very much for all the information about the oscillator.
I´ve just received reply from the manufacturer, as you can see below. I´ll try 
to get information from Motorola, but I think it´s a rather difficult task.

Best regards, José, EA1PX

___



Jose,



This is a special for Motorola.  You have to contact Motorola for their 
information.



John Cuthbertson

Director, Sales and Marketing

Tel:  516-794-4500 Ext. 5105

Fax:  516-794-4340

[EMAIL PROTECTED]











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[time-nuts] FMT on October 13

2007-09-24 Thread John Ackermann N8UR
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The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to
announce that the first annual MVUS Frequency Measuring Test will be
held on Saturday, October 13, 2007.  There will be two transmission
periods: the first at 14:30 EDT (1830 UTC), and the second at 21:30 EDT
(0130 UTC Sunday).  Transmissions will be on the 80M, 40M, and 30M
amateur bands from Dayton, Ohio under the callsign W8KSE.

Frequencies will be approximately: 3555 kHz, 7055 kHz, and 10115 kHz,
but be prepared to tune as we will adjust to minimize QRM.  The
transmitters will be running about 75 watts output into wire antennas
for each band.  All the transmitters will be driven from a common
frequency standard.

We will transmit on all three bands simultaneously.  Plans are to
transmit two 10 minute test periods, and a third if the transmitters
aren't melting by that point.  The frequency will be changed by a small
amount (less than 200 Hz) between transmission periods.  So, a complete
submission will include two or three separate measurements for each band.

Our goal is to transmit a signal known in frequency to parts in 10e-12
(i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar
level during the course of the transmission.  Frequencies will be
measured at the transmitter site with a system capable of microHertz
resolution referenced to a GPS disciplined oscillator, and will also be
monitored by another station in groundwave range that can measure the
frequencies with similar accuracy.

The MVUS Frequency Measuring Test is intended to supplement, not
replace, the ARRL FMT.

Further information, including approximate transmission frequencies,
will be posted at http://www.febo.com/time-freq/FMT.  You can also send
email with questions or comments (or, after the test, your results!) to
[EMAIL PROTECTED].

For discussion about off-air frequency measurement, we suggest you check
out the FMT-nuts mailing list, sponsored by Connie Marshall, K5CM.  For
details, go to http://tech.groups.yahoo.com/group/FMT-nuts/.

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Re: [time-nuts] FMT on October 13

2007-09-24 Thread Hal Murray

 Plans are to transmit two 10 minute test periods, and a third if the
 transmitters aren't melting by that point. 

 Our goal is to transmit a signal known in frequency to parts in 10e-12
 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar
 level during the course of the transmission.  Frequencies will be
 measured at the transmitter site with a system capable of microHertz
 resolution referenced to a GPS disciplined oscillator, and will also
 be monitored by another station in groundwave range that can measure
 the frequencies with similar accuracy. 

Suppose I have a pile of good lab gear, and it gets N seconds of signal.

How accurately can it measure the frequency?


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[time-nuts] HP-3566 Mini Manual

2007-09-24 Thread Tom Clifton
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Nice web page at KO4BB's Home Page:

http://www.ko4bb.com

Lots of good stuff including a 30 page brief operating
manual for the 3586.


   

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Re: [time-nuts] FMT on October 13

2007-09-24 Thread Tom Van Baak
 Plans are to transmit two 10 minute test periods, and a third if the
 transmitters aren't melting by that point. 
 
 Our goal is to transmit a signal known in frequency to parts in 10e-12
 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar
 level during the course of the transmission.  Frequencies will be
 measured at the transmitter site with a system capable of microHertz
 resolution referenced to a GPS disciplined oscillator, and will also
 be monitored by another station in groundwave range that can measure
 the frequencies with similar accuracy. 
 
 Suppose I have a pile of good lab gear, and it gets N seconds of signal.
 
 How accurately can it measure the frequency?

Hi Hal,

If you have a low noise CW signal, a cheap, legacy 1 ns
resolution counter will give you 9 digits of resolution per
second. So to measure to parts in 10^12 requires gate
times on the order of a thousand seconds.

A fancier, modern counter like a HP 53132A is almost ten
times better than that so 100 s gate times are all you need
for 12 digits. Further, if it's an oddball frequency (i.e., not
a nice multiple or fraction of 10 MHz) even 10 second gate
times are sufficient with this counter (it does clever CW
oversampling inside).

For extreme counters like HP 5370 or SR 620 with resolution
well under 50 ps you can measure any frequency to 12 digits
in a matter of tens of seconds.

The main problems at this level are often that neither your
frequency reference nor the frequency you are measuring
are stable to parts in 10^12th. So the measurements you
get will contain the sum of noise in both sources and the
counter itself. And this noise is often well above parts in
10^12th. It takes time, statistics, or other tests to determine
the noise contribution of each.

I would think this is especially true for non-local frequencies,
such as one received over the air. I'll leave it to you FMT
guys to comment on the magnitude of degradation due to
transmission and reception noise.

While were at it, in the case mentioned above I'm a curious
about their FMT frequency standard -- if it's really accurate
to parts in 10^12, as they imply, over 10 minutes. I could
believe this if it were an Rb or Cs-based GPSDO.

Usually the accuracy of GPS disciplined oscillators are spec'd
for averaging times over a day. And at one day, parts in 10^12
is very easy (many are down in the low 13's or 14's). But over
a short span like 10 minutes most quartz-based GPSDO wander
in frequency by many parts in 10^11. See, for example, these
two nice quartz GPSDO over 10 minutes and note the scale is
1e-11 per *division*; which is almost 1e-10 full-scale.

http://www.leapsecond.com/pages/fury/#6

/tvb


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Re: [time-nuts] FMT on October 13

2007-09-24 Thread Didier Juges
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I guess it depends on signal to noise ratio. With reciprocal counters, you
only need one period to measure as acurately as you need, but to have good
acuracy, you need very good S/N, as there is no filtering possible. 

For example, the HP 5370 can measure a single period of a signal with a
resolution of 20pS (excluding noise and trigger imperfections), so excluding
these errors, the HP 5370 could measure a single period of a ~3.5 MHz signal
with 7 x10-5 precision (if I have not goofed the calculations) More
periods improve the resolution proportionately to the quare root. Accuracy
is another matter.

Didier KO4BB


 -Original Message-
 From: [EMAIL PROTECTED] 
 [mailto:[EMAIL PROTECTED] On Behalf Of Hal Murray
 Sent: Monday, September 24, 2007 5:26 PM
 To: Discussion of precise time and frequency measurement
 Subject: Re: [time-nuts] FMT on October 13
 
 
  Plans are to transmit two 10 minute test periods, and a 
 third if the 
  transmitters aren't melting by that point.
 
  Our goal is to transmit a signal known in frequency to 
 parts in 10e-12 
  (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar 
  level during the course of the transmission.  Frequencies will be 
  measured at the transmitter site with a system capable of 
 microHertz 
  resolution referenced to a GPS disciplined oscillator, and 
 will also 
  be monitored by another station in groundwave range that 
 can measure 
  the frequencies with similar accuracy.
 
 Suppose I have a pile of good lab gear, and it gets N seconds 
 of signal.
 
 How accurately can it measure the frequency?
 
 
 --
 These are my opinions, not necessarily my employer's.  I hate spam.
 
 
 
 
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Re: [time-nuts] FMT on October 13

2007-09-24 Thread Bruce Griffiths
Didier Juges wrote:
 I guess it depends on signal to noise ratio. With reciprocal counters, you
 only need one period to measure as acurately as you need, but to have good
 acuracy, you need very good S/N, as there is no filtering possible. 

 For example, the HP 5370 can measure a single period of a signal with a
 resolution of 20pS (excluding noise and trigger imperfections), so excluding
 these errors, the HP 5370 could measure a single period of a ~3.5 MHz signal
 with 7 x10-5 precision (if I have not goofed the calculations) More
 periods improve the resolution proportionately to the quare root. Accuracy
 is another matter.

 Didier KO4BB
   
Didier

With band limited gaussian noise and an SNR of 40dB the rms error in
measuring the period of a single cycle is about 0.3%

Bruce

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