Hi Fred,
It sounds like you are turning it too far and too fast and expecting too much
from it. In old items, like what you have, those adjustments are fairly coarse
and required a very slight touch, then a wait and see, then another very slight
touch, etc.,. It sounds like you are turning a
Fred wrote:
I tried making small incremental adjustments but after I am done,
the frequency drifts several Hz and then re-stabilizes at a new value.
That is to be expected. Adjusting an oscillator is an iterative
process. After a while, you should get a feel for how far it drifts
after
One further thought: You say it drifts several Hz -- that seems like
quite a lot, if you are making small adjustments. I'd expect perhaps
several tens of mHz at most, although if it was way off when you
started, Hz might be possible at the first iteration. I suspect you
have a mechanical
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This is the method I use for my 5110. There are two 10 mhz outputs on the
osc - you can unplug one of the plugs and use a 10x probe there. My unit
will hold a couple of parts in
10-8 for months.
73,
Bill, WA2DVU
Cape May, NJ
-Original Message-
From: time-nuts-boun...@febo.com
Le 7 mai 2013 à 20:00, Sarah White a écrit :
On 5/6/2013 9:38 AM, Chuck Forsberg WA7KGX N2469R wrote:
I would like to set up a NTP server on a machine running Linux
(currently Korora 18).
What are the requirements for the 1 PPS signal fed to the carrier detect
pin?
I presume the 10 us
Hi
Full blown, troublesome OCXO set procedure:
1) Touch the adjustment gizmo with your tuning tool. Don't adjust it. Watch the
frequency, does it bounce? (change over several minutes). If so, your tuning
tool is cooling off the oven. Find a lower thermal conductivity tool.
2) Take a
I use this method too, but I also find it little use trying to get the
internal reference down to the last squeak in 10^11 on this kind of kit. It
will not hold the setting for vey long and it takes ages to get the
adjustment spot on. I get as close as I can easily.then allow the
unknown
A couple if items that may have already been mentioned:
1. You've probably already seen the effects of the capacity of your adjustment
tool on the oscillator frequency if you are adjusting a variable capacitor. It
sometimes becomes a tweak, remove tool, watch and tweak again issue. If you
Hello time-nuts,
I'm wondering if someone in the group has information on the Trimble 34310
oscillator variations? These are used in the Nortel NTBW50AA GPSTM GPSDO
modules, and I have seen T, C2, and V variations. Researching the archives
I also found reference to a T2 version. At sometime I
Thanks for all the helpful suggestions and comments so far. I will
answer a few of the questions that have been raised.
The device definitely is an OCXO as it is in an oven and gets warm. It
is an Ovenaire 73-25.
As one person commented, there are two 10 MHz outputs on the device.
I was going to write the same thing. That the DCD line has nothing at
all to do with baud rate. But that applies to a real serial port.
If this is being done on a Serial-USB dongle that all bets are off
and you'll never get really good result as USB adds to many software
laters.
You can buy a
One point of clarification. In my last post I said:
So far, the range seems to be from around 9.75 to 10.25 and it
has been on for over 18 hours.
That is not how much it drifts, but rather the range over which the
frequency on the counter has varied as I have tried to touch up the
Fred,
Be careful about the 'tweaking'. It can become very addicting. Short of a
GPSDO, you'll always have to tweak from time to time. The problem is being
able to define what tolerance you are willing to accept and how often you
don't mind tweaking.
Otherwise, you never get any work done,
I forgot to mention in my earlier email, a +/- 25 Hz range for the OCXO is
fairly large. I have an OVENAIRE OCXO in an EIP 545A that has a range (by
20 turn pot) of about +/- 2.5 Hz.
I suspect you are adjusting a capacitor, not a pot.
Joe
-Original Message-
From:
One of the things I hadn't adequately considered was how quickly / much
the oven cycling affects things. I wasn't really thinking about this
when tweaking the adjustment so I wasn't doing them at a consistent
point in the cycle.
Now, it looks like it may be cycling from a low of 10.01 to
On 5/7/2013 2:00 PM, Sarah White wrote:
If you have problems with PPS, just set the serial port to a higher baud
rate... This is the reason I recommend against using the DCD line on the
same serial port you're using for TSIP
((snip))
On 5/8/2013 6:53 AM, mike cook wrote:
Sara, I'd be
Hi
If it's moving up and down from +1 to +17 Hz from 10 MHz relative to 10 MHz,
it's broke. Either the OCXO it's self is in trouble or the supply going into
it has an issue.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
On 05/08/2013 10:50 PM, Bob Camp wrote:
Hi
If it's moving up and down from +1 to +17 Hz from 10 MHz relative to 10 MHz,
it's broke. Either the OCXO it's self is in trouble or the supply going into
it has an issue.
... or as a remotely an issue a weak connection creating too much serial
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