On Jan 5, 2020, at 1:29 PM, Robert DiRosario <[email protected]> wrote:
I'm back, sorry for the delayed response.
My understands is in the HP 5340A counter (all HP counters?) the 10544 or 10811
always has power, regardless of the power switch, as long as it is plugged
in. Everything at our work bench is always plugged in.
History
We (the radio club) have three HP 5340A counters, two 5345A counters and an HP
106B. We took one of the 5340As and the 106B to the building with the Cs
standard in a minivan with a 12V to 120V inverter. The 106B had a good battery
pack, but it was still powered with the inverter. The first test was to put 10
MHz from the Cs standard into the counter, and it read 10000000. MHz. We moved
on to plan B, we put the output of the OCXO into a counter what was driven by
the Cs standard. The error was less then 0.1 Hz. We made a little change to
the 10811 and moved on to the 106. The error on the 5 MHz output was again
less than 0.1 Hz, we made a small change to it. We ate our lunch and moved the
counter cable back and forth between the 5340A and 106B and watched them. They
both stabilized. 20 years latter, I don't recall what the final error was. It
was much better than any piece of ham gear anyone would have.
In 2011 the club got relocated to three mobile home trailers. They have HVAC
wall-packs, so we have Heat and AC 24/7 year-round.
Before the move the HVAC in the one room building that housed our work bench
and VHF station stopped working. The 106 also stopped working. I started
looking at a GPSDO after the move. I picked up some 10811s and Navman Jupiter
TU modules with 10 KHz output, but other projects came along and I lost
interest in this.
Today:
This fall at a hamfest I got a working TrueTime XL-DC with antenna and feedline
for $45, it has 1 ppp and IRIG-B, but no 10 MHz output. This restarted my
interest in this project. Then I got some complaints from other club members
that our HP Modulation Analyzer was both off frequency and the deviation
measurement it was giving was also wrong.
The first goal is to have fun and learn something new.
At the club we have 3 5340As (18 GHz), the 53131A (225 MHz), a pair of 5435As
that don't work, and the 106B that doesn't work.
The goal is to have a calibrated standard to drive all of our test equipment.
It should be accurate and precise enough to allow club members to calibrate
their own equipment. That would point to a GPSDO. A 10811 for start, the 106
if I can fix it.
At home I have several HP counters, 5340A (18 GHz), 5341A (4.5 GHz), 5385A (1
GHz), 5386A (3 GHz) and a 5334B (100 MHz, dual channel, sill do TI), but none
are calibrated. I have a NI HPIB card I need to get working. I have a HP
Z3801A that I need to get a power supply for. I have several 10811s, a pair of
105Bs, a Trimble 57963 board, and the simple complete Trimble 57963 system. I
also have a Brooks Shera board that is built, I have some connectors for it on
the way.
I have a full set of time-nut toys to play with! My view is I have no known
working primary standards yet, so I'm starting from scratch.
I need to compare the Trimble GPSDO to something else. The Z3801A or Brooks
Shera's board controlling a 10811 or one of the 105Bs.
Thanks
Robert
On 12/26/2019 11:51 PM, Robert DiRosario wrote:
I am trying to calibrate some equipment at the amateur radio club at work, and
my stuff. We have an HP 5340A with a 10811 inside. It must have been upgraded
at some point in the past, the display uses Nixie tubes. I calibrated it c2000
using a HP Cs standard. That lab and it's equipment are gone. :-(
From ebay / China I got a simple GPSDO that uses a Trimble 57963 inside. I
use the output of the 10811 in the 5340A to drive an HP 53131A. I then
measured the 10 MHz output of the GPSDO using the HP 53131A and got
10,000,000.08 Hz.
Assuming the GPSDO is correct, is 0.08 Hz drift over 20 years a reasonable
amount of drift for an 10811?
I have an HP Z3801A, once I get a power supply for it I can check the other
GPSDO.
Thanks
Robert
KA3ZYX
__________________
On 12/26/2019 11:51 PM, Robert DiRosario wrote:
I am trying to calibrate some equipment at the amateur radio club at work, and
my stuff. We have an HP 5340A with a 10811 inside. It must have been upgraded
at some point in the past, the display uses Nixie tubes. I calibrated it c2000
using a HP Cs standard. That lab and it's equipment are gone. :-(
From ebay / China I got a simple GPSDO that uses a Trimble 57963 inside. I
use the output of the 10811 in the 5340A to drive an HP 53131A. I then
measured the 10 MHz output of the GPSDO using the HP 53131A and got
10,000,000.08 Hz.
Assuming the GPSDO is correct, is 0.08 Hz drift over 20 years a reasonable
amount of drift for an 10811?
I have an HP Z3801A, once I get a power supply for it I can check the other
GPSDO.
Thanks
Robert
KA3ZYX
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and follow the instructions there.
On 12/26/2019 11:51 PM, Robert DiRosario wrote:
I am trying to calibrate some equipment at the amateur radio club at work, and
my stuff. We have an HP 5340A with a 10811 inside. It must have been upgraded
at some point in the past, the display uses Nixie tubes. I calibrated it c2000
using a HP Cs standard. That lab and it's equipment are gone. :-(
From ebay / China I got a simple GPSDO that uses a Trimble 57963 inside. I
use the output of the 10811 in the 5340A to drive an HP 53131A. I then
measured the 10 MHz output of the GPSDO using the HP 53131A and got
10,000,000.08 Hz.
Assuming the GPSDO is correct, is 0.08 Hz drift over 20 years a reasonable
amount of drift for an 10811?
I have an HP Z3801A, once I get a power supply for it I can check the other
GPSDO.
Thanks
Robert
KA3ZYX
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
