The information below was posted to the list by another member back in
2008. I never used the SW305 power supply with mine and haven't confirmed
these connections, so the Check before use is still very good advice:-)
Hi Nigel and many thanks for that -- thanks also to Tom for the references.
The
Please see attached article
http://www.electronicsweekly.com/Articles/10/01/2013/55341/piface-raspberry
-pi-io-board.htm?dm_i=1GUU,17S1R,805O95,440WA,1
Rob Kimberley
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On Wed, 09 Jan 2013 21:48:00 +0100, Azelio Boriani wrote:
and don't forget the PM6681 (50pS)
I have a PM6680 (250 or 300pS) i think , but it was within my budget.
I just read the Service manual , and noticed that both the PM6680 the
6681 has a battery inside that holds the settings.
The
Gang,
I have two DATUM 9390-52054 Disciplined Oscillators that use a
Vectron International model 716Y2690 crystal oscillator module. One
of the two units is showing 10 kHz sidebands about 35 dB down from
the main 10 MHz carrier, and looking at them on my spectrum analyzer,
they appear to be
Can you completely swap the Vectron crystal oscillator modules between
the Datum units? Maybe the fault lies in the other part. If they are
GPSDOs, each must have a DAC somewhere driving the tuning control line
to the VCXO, The 10 kHz may be the DAC serial data rate, or a PWM rate
for fine
Oops - regarding that capacitance test on the tuning line, I meant to
say up to several uF or more. You can start small to see if there's
any effect. It all depends on the impedance of the tuning line
circuitry, and the existing amount of filtering - you may need quite a
bit of C to swamp it
Dear Nuts,
Does the buildup of tarnish on the exposed silver electrode of a typical GPS
ceramic patch antenna have any degrading effect on signal reception? A little
Tarn-X easily removes it, but I wonder if it's worth bothering, as it always
comes back weeks or months later. I've seen it
It should have virtually no effect.
Ed
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Yes, the battery on the PM6681 is a real problem, unless you have the
unobtainable calibration program. The program uses the GPIB to perform the
calibration: I have tried to figure out the GPIB commands involved in the
calibration process by looking at the firmware dump... the commands are
clear
On 2013-01-10 23:14, Azelio Boriani wrote:
Yes, the battery on the PM6681 is a real problem, unless you have
the unobtainable calibration program. The program uses the GPIB to
perform the calibration: I have tried to figure out the GPIB
commands involved in the calibration process by looking
HI
One thing missing from the list was the HP 53181. It's useless as a timing
device and thus didn't get listed. If you are after frequency only, they
occasionally show up for quite a bit less than the 53131's. As a frequency
counter, they have the same performance as a '131. All of the 53131,
Let me put in a recommendation for python / scipy / numpy / matplotlib as a
replacement for Matlab or octave. I used Matlab as a student and octave
since, and they do their job well, but the python tools have the advantage
of a better, more modular, less idiosyncratic language.
The scipy
Ed,
Thanks for you suggestions. I took a look at the control line and
saw about 100 mV of grunge and then took a look at the +12 volts
going to the oscillator and saw about 2 volts of the same stuff. I
then went and took a look at the DC to DC Converter's output and say
the same about 2
The reason that silver is used is that the oxide is also a very good
conductor.
Don't worry.
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Sent: Thursday, January 10, 2013 12:33
To: Discussion Time-Nuts
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