Actually, there were 2 extra pulses.
Here is the PPS view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
(Samples every 10 seconds.)
Here is the audio view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png
Bert,
Good that you got the EFC working! But I would be a bit suspicious of
needing -13V.
It seems from:
http://www.ece.gatech.edu/academic/courses/ece4007/08fall/ece4007l01/al4/datasheets/symmetricon_oscillator_instructionsheet.pdf
that the default EFC configuration is (0 to +10)V with a
What do you mean with it finds noise? When the PLL can no longer track
the sinewave? I think that a simulator with such a behaviour must be
written specifically for that capability.
On Fri, Aug 10, 2012 at 10:51 AM, Hal Murray hmur...@megapathdsl.netwrote:
Actually, there were 2 extra pulses.
Bjoern
Thank you for the link I am able to change the frequency 4 Hz from - 2Hz (
0V) to + 2 Hz (-12.2V) using pin 2. Reading the info that you got me
probably explains the slot next to the connector, but I experience a much wider
tuning range on pin 2 and John is right any positive
Does anyone have any idea please of the actual model name for the Trimble
23632-10 and/or 23632-20 combined antenna/receiver unit?
I have seen some Ebay sellers describing these as Acutime 2000s but the
case style doesn't match and they appear to be physically much more similar
to the
Hi Bert,
I see on the data sheet that the tuning voltage is supposed to be -10 to
+10 volts and that the supply voltage is +22 to +30 volts. I suspect
that one side of the varactor is supposed to be biased at one half of
the supply voltage. But in your case, it looks like that bias is now
Hal, do you have a resonant 60 Hz filter in the pickoff? The waveform
in Aug-09-a1 certainly had multiple zero crossings.
Remote-controlled tap changers can do things like that.
If I got the UTC offset right, that happened at about 2 PM local time,
when a big transformer tap could have been
Ed
I did not see any current, but that is also due to the fact that there is
most likely at least 10 K between pin 2 and the varactor. Most likely if it
was biased for instance + 12 Volt, there would also be a resistor before
the diode. I suspect John is right that with my + voltage the
b...@iaxs.net said:
Hal, do you have a resonant 60 Hz filter in the pickoff?
Not by intent. It's just a wall-wart transformer and then some resistors to
get the right level. There are the standard cables (wall wart, RS-232,
audio, clip leads). I'm sure there are resonances in there but
azelio.bori...@screen.it said:
What do you mean with it finds noise? When the PLL can no longer track the
sinewave?
I was thinking of a PLL to track the input and then a simple compare of raw
input vs filtered output. If they don't match closely the difference is the
noise that the PLL is
From slowly working my way thru several new to me datum 1000's I'm coming to
the conclusion that powering them up checking for output and basic
functionality (ie can the frequency be adjusted ?) followed by leaving them
alone and powered up for several weeks to a month or so is probably the
Bert,
I wasn't suggesting amps of current. A normal reverse-biased diode
would give nanoamps of current flowing out. Microamps (or more) of
current flowing in would show that the internal biasing of the varactor
was messed up. A bad diode could also show current flowing in, but your
Ed
I think so too. I hope if it is a shorted capacitor it stays but looking at
for instance at the bias of a 10811. There would be no capacitor right at
the diode. I have the tuning network for a 1130 and it shows a 20 K to an
internal +12 V
Bert
In a message dated 8/10/2012 2:01:22 P.M.
Software 60Hz PLL
Lester B Veenstra MØYCM K1YCM W8YCM
les...@veenstras.com
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les...@veenstras.com said:
Software 60Hz PLL
Yup. It probably needs an AGC too.
Anybody got code I can start with?
--
These are my opinions. I hate spam.
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Hi
Normally when you forward bias a varicap, nothing strange happens. The
capacitance goes way up as it goes forward and then it pretty much turns into
an RF short circuit. The series resistance of the device drops considerably as
this all takes place. If it's in series with the crystal, the
Hi All, I have some Oscillatek 5292 12.000 MHz TCXO's.
I am looking for the power supply and general specifications.I have tried
Google with no success. Thank you in advance Gary VK2KYP
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