.
Corby Dawson
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___
time
by some. Also note the DDS board I used is the one from the
1PPS
output units.
Hope this is useful!
Corby Dawson
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like to avoid any hardware kludges and hopefully make the fix in the
terminal software.
Thanks,
Corby Dawson
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John,
The battery nominal voltage is 3.0VDC it's a BR-2/3A
Corby
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Bummer!
Chuck was always very helpful and a real stand up guy. Really sorry to
hear the bad news! He will be missed.
Corby
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own using a low power oscillator to
drive a power amplifier and impedance matching network. This has worked
very well!
Corby Dawson
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volume)
Pumps are 20 LPS varian triodes.
Corby Dawson
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instead of the palladium plug.
There are details in some of the maser stuff on-line about its
construction.
Corby Dawson
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John F.
Google Maser contamination and you will find a Russian blurb describing
what I'm talking about. Even with LN2 traps they had problems.
Corby Dawson
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Bill,
Here's a PIX if it does not get scrubbed off!
Corby
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John F.
I don't have an RGA as there are no leaks to speak of in the Maser.
I do have an annoying leak in my roughing manifold but plan to pump it
down and spray some helium around the suspect area and see if my
millitorr gauge will respond.
It's a tiny leak as I can do a pumpdown OK but I'd
John F.
The internal pump lifetime is reduced as it has to pump the waste
Hydrogen after it leaves the bulb.
These pumps elements swell after burying increasing amounts of Hydrogen
and eventually short out.
Corby Dawson
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John F.
The pumps can be rebuilt. Duniway Stockroom here in CA. among others does
the deed.
Corby
Moms Asked to Return to School
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bottle fittings are no longer
available.
I'll see if I can post a PIX or two of the Vacsorb pumping station and
the ion pumps.
Corby Dawson
cdel...@juno.com
Obama Urges Homeowners to Refinance
If you owe under $729k you probably qualify
Attila,
The precision on the cavity itself does not need to be so tight as a
mechanical tuning plunger takes up the initial tuning slack.
The varactor tuning covers more than 10Khz
This cavity is held at approx. 50 degrees C.
The collimator for an active maser is a bundle of MANY hollow glass
The operation manual for the EFOS maser is on Tom Van Baaks website
http://www.leapsecond.com/museum/efos/efos-1.pdf
Maintenance manual will follow later as I have to mail a CD to him with
the 2nd manual.
Corby Dawson
1 Tip
tune so is a bit less complex in
that regard. Spin exchange tuning is the best way to get to the proper
operating point.
this requires some measurements and then setting the cavity varactor to
the calculated voltage.
Corby Dawson
Obama
and a low noise downconvertor.
I have, somewhere, a scan of the two manuals. There is lots of theory and
full schematics. Might be a good read if you are serious in trying to
homebrew one.
I'll dig them up and see if anyone could host them on a website. (Files
are quite large!)
Corby Dawson
I've listed an FTS 1000B on eBay. Item # 320580887914 if anyones
interested.
Corby
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Stanley,
Put me down for two.
Thanks,
Corby Dawson
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Joe,
Try swapping the A8 module and see what happens.
Corby
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even more
isolation. (no idea how you could begin to measure the reverse isolation
of the two in series!)
see: http://www.cliftonlaboratories.com/z1_buffer_amp.htm
Corby Dawson
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The Tracor 527E is the same as the 895 with the addition of the frequency
difference circuit and meter. Both units have the phase meter which
slowly changes with a frequency difference. The frequency difference
meter on the 527 gives a steady calibrated indication of the frequency
offset.
Corby
I'm rearranging my timing rack and am getting rid of a Tracor 895A +
manual and a few oscillators on eBay.
Corby Dawson
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the lock washer, wait
until the goop cures, and then
tighten until the lock washer is compressed and the bolt is tight.
Just don't know what product to try! Want to be able to disassemble
without special tools or heating.
Any help is appreciated!
Corby Dawson
Hi,
I have come across a few 10811 oscillators over the years that had an HP
sticker on them stating upgraded to 3010A
Anybody know what this entails?
Thanks,
Corby Dawson
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( I called it the 5065Jr.). Needless to say the performance
suffered.
Corby Dawson
Diet Help
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from the bulb, but the operation
of the standard only needs a good output at a very specific frequency
(7800 angstroms).
So if the wideband light output is down but the 7800A is good the photo-I
is low but the RX output is still good!
Hope this helps.
Corby Dawson
by applying 5VDC thru a 5ohm 10watt resistor to the
TED (thermoelectric device) in the receiver for 6 days or so.
Corby Dawson
Diet Help
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6.14X10-13th
10 sec 3.52X10-13th
100 sec 3.35X10-13th
This of course is a selected unit, but after testing MANY of the
different variants it is one of a small percentage of excellent ones.
Using it as a counter time base would be a waste!
Corby Dawson
BOB,
It was one of the special custom built units by HP not listed in the
catalogs.
Corby
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Hi,
I just listed a HP K04 59991A frequency multiplier comparator on ebay
320486215475
Details in the listing but any questions welcome.
Corby Dawson
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.
How to I advance or retard the hands to set the time?
Also how do I test the synchronizer?
I see two Fahnestock clips That look to connect to the synchronizer
solenoid.
With an appropriate interface can I synchronize it to a GPS 1PPH?
Thanks,
Corby Dawson
the last time I looked.
Corby Dawson
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Almost forgot!
The reason I posted the original message was the reference to four inch
long plastic capacitors
The PPS capacitors are quite compact and available in surface mount too.
Corby
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The NBS DMTD uses a .15uf polycarbonate capacitor for the filter channel.
The polycarbonate TC is a bit better than the PPS but they are hard to
find for the mini DMTD at a decent cost.
Most manufacturers no longer make polycarbonate capacitors.
The substitution of the PPS capacitors into the
Dave,
The modules I was built went into the TM501 single slot frame.
I used the line voltage jumper to raise the voltage from the bridge a
bit.
I also used a 6800uF capacitor on the bridge output.
I used an LM317 regulator and set its output at 22VDC.
Hope this helps!
Corby
Bob,
While not considered cheap you may want to consider an HP 5065A.
See my post Short term stabilities of some HP 5065A in the Sept. 2008
Time-Nuts.
These were plotted in an uncontrolled environment.
As you can see quite a few were in the 7X10-14th range at 1000 seconds.
Corby Dawson
Bob,
Sounds like a good thing to try.
It just depends how many DOXCOs you have to go thru to find one that
gives you a decent short term stability in the 1 to 100 second range.
I have found that even if the published spec is 1X10-12th at 1 thru 100
seconds actually finding units that perform
Ed,
The easiest way is to couple out the 10Mhz from the two pins on the
connector holding the 10811 into a Fet input buffer amplifier that can
drive 50 ohms.
There are lots of FET buffer schematics floating around.
Try the radio amateurs handbook or google it.
Good Luck!
Corby Dawson
I bought a couple Bliley 100Mhz oscillators about a year ago, part #
NV26R891.
Now that I want to use them I can't find the pinout to identify which
pins are the EFC and power.
Can anyone help?
Thanks,
Corby Dawson
Water Heater
Some
in parallel with a .1uf capacitor.
My understanding is that the capacitor will shunt any RF on the shield to
chassis ground, but what does the resistor do?
I'm getting the hardware together to change over to SMA on the critical
connections and ran into this question.
Thanks!
Corby Dawson
Hi,
I just posted a very nice FTS oscillator on eBay. 320453093813
It's an FTS 9110/120, take a look.
Corby Dawson
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into the inner lining of the bulb envelop.
Sometimes these bad bulbs show a definite envelope darkening to the eye.
Hope this helps.
Corby Dawson
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and bolted to the top frame of
the module.
The 10Mhz output is on the front along with a lock LED.
Hope this helps.
Corby Dawson
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Bruce mentioned an LPRO repair manual.
Does it have schematics and if so where can I get one?
Thanks,
Corby Dawson
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Hi,
I've listed a nice Milliren oscillator on eBay, take a look!
item 320438041645
Corby Dawson
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C). Does anyone know of a company that can do this plating for me?
Thanks,
Corby Dawson
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Stan.
Calibrating the units timebase per page 76 of the manual you can
manually
adjust the calbyte 4 word until the counter averages zero offset plus
minus around the 5Mhz.
You will still have the .0060 bias but it will plus and minus 30.
Corby Dawson
Hi,
I listed the Riehle book and the Rubiola book on frequency standards on
eBay.
Corby Dawson
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Forgot to mention the FTS 1200 oscillator on eBay right now!
Corby Dawson
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square on the end cap where the spent beam
impacts.
Is it really bamboo? Kind of neat if it was, ultra hi tech meets ultra
low tech!
I'll post the link to the pictures once I get the time to do the cutting.
Corby Dawson
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in the game.
John Akermann has graciously offered to provide a space for me on his
website to post the pictures.
I'll take some PIX of other areas of the tube also while I'm in there.
Best Regards,
Corby Dawson
Free Screensavers
but HP tubes DO NOT.
I'll see if I can look thru my box of ovens and if I have an FTS oven
I'll cut it open and see.
Corby Dawson
I do have PIX of the above but nowhere to post them!
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While copying the EEprom data to use with a new tube might be a
copyright violation, removing the EEprom from the defective tube and
using it with a replacement tube would not! It is easily removed from a
small PC board mounted on one of the tubes connectors!
John, There are stages in the EM.
not been able to find the tube parameters in the EEPROMS.
If you used the original EEPROM and just modified the thermistor, mass
spec., and ionizer values I think the copyright issue would still not
apply!
Corby Dawson
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in the control loop somewhere.
(most likely the A9 card)
Do check the 3 non hermetic electrolytics on the power supply card to see
if they are leaking goo.
Any questions please email me.
Best Regards,
Corby Dawson
cdel...@juno.com
Best Weight
Great,
Thanks for the help. Looks like 1992 was the last catalog offering the
5065A.
Now, anyone having a 5065A or two let me know if they have a serial
number above 2816A01693.
Trying to see what the last 5065A sold had as a serial number.
Best Regards,
Corby Dawson
cdel...@juno.com
.
Thanks all.
Corby Dawson
cdel...@juno.com
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will be
jumping around quite a bit!
Also make sure that the delay is adjusted so the counter updates every
second, you can be updating every two seconds which nullifies the
cancellation of the noise in the L.O.
Corby Dawson
Always a good call. Click
with tube types of 10890A and 10891A respectively.
The measured performance of the US prefix tube indicates a standard tube
performance as far as short term stability goes.
Anyone have any idea what specs would be different on this tube, or what
application is was built for?
Thanks!
Corby Dawson
Hi,
Has anyone measured the outer oven temp of the double oven HP oscillator
in the Z3801A?
Thanks,
Corby Dawson
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Hi,
The delay circuit consists of toggle switch increments of 1 thru 180
degrees in binary steps (using differing lengths of miniature coax cable)
as well as a fine adjustment that consists of a couple transistors with
varactors. These are built into the unit inside sealed cases and with the
unit
I've built a circuit using a toko tk11650nt voltage regulator in a TO-92
package I got from Digikey a few years back.
I need to know the max input voltage and the pinout to verify before I
power the circuit up!
Can anyone help?
Corby
run against other oscillators also show that Osc 3 causes a rise in
the value at 1 second.
Thanks,
Corby Dawson
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Arnold,
Look at the top of page 3 on the link below. Not sure how they arrived at
their conclusion but there is one opinion on the HP mixers!
http://www.unusualresearch.com/AppNotes/TimeNuts/OptDualMixer.pdf
Corby Dawson
Debt
Yes the rubidium 87 isotope is technically radioactive as it does decay
and have a half life.
However it takes special techniques to measure as the activity level is
so low.
A piece of granite probably has more radioactivity than the tiny amount
in a rubidium standard.
This link gives some more
There is another 5062C on eBay from the same source as the last one.
Corby Dawson
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We use the Trimble 9390 where I work.
Around the Y2K period we received new EPROM sets to put into the units.
I checked yesterday and they are displaying the correct day and year.
Let me see if I can find a spare set of EPROMS to download.
Corby Dawson
to the design? Making the
board smaller and
using the PIC to do some more of the work.
Best Regards,
Corby Dawson
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There's an HP 5062C closing on eBay soon!
Corby
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___
NC
8 +28V elect. +28V +28V
+28V
9case groundNCNC
NC
Hope this will help others!
Corby Dawson
Hi,
Put me on the list also.
Thanks!
Corby Dawson
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is built into a
vacuum dewar.
The B designates units I am testing for a friend, I believe he wants to
keep the best one and sell the rest.
If that turns out to be the case I will post a heads up when I list them
on eBay for him.
Cheers!
Corby Dawson in California
Hi,
I bought an Isotemp OCXO36-54M a couple years ago on eBay and used it
for a short while.
I wanted to run some tests on it but I can't find the pinout!
Can anyone help?
Much Appreciated!
Corby Dawson
Find the right voice
Thanks,
Those are not the ones.
The Isotemp OCXO36-54M is approx 2 X 2 X5 with an octal base.
Corby
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Short term stabilities of a bunch of quartz oscillators.
I had posted this some time ago but this is an updated version.
In answer to Ulrich's earlier question on the FTS 1200 #1 I retested it
in
the same setup as the FTS1200 #2 and it still showed the results
below. The Piezos are the 10811
on pins 1 3 and 4 and finding the pot at the other
end.
These 1000B have pins 3 and 4 as shown.
In this case pins 1 and 4 connect across the pot and the wiper goes to
pin 3. The pot on the 1000B will not have any effect.
Hope this helps.
Corby Dawson
will be adding some more to the quartz oscillator
short term stability list I posted last year.
A couple FTS1200 with accelerometers + a few more misc. oscillators.
Cheers,
Corby Dawson
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Thanks Bruce.
Actually the +15VDC is the oven supply and the +24VDC is the electronics
supply, kindof surprised me!
Corby Dawson
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Hi,
I have an FTS 1000A-100 oscillator that takes +24VDC on one pin and
+15VDC on another to operate.
Does anyone have a data sheet that gives the power supply ranges?
I like to know if they overlap so I can supply both pins from the same
supply.
Thanks,
Corby Dawson
David,
The long storage is not the cause. Extended operation of the ion pump
causes the whiskers to grow. They can give rise to field emission
leakage currents.
This manifests as a raised ion pump current but does not inhibit proper
operation unless the current gets too high.
I don't remember
not try this until the current rises enough to cut off the ovens.
Your current is still quite low.
Corby Dawson
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John,
You can manually de-gas the ionizer and oven filaments.
It looks like you had already brought the oven up to temp so just work on
the ionizer.
You can bring the voltage up slowly and keep watch on the ion pump
current so it does not get too high.
Once you have got it up to the rated
Tim,
I do have a schematic of the voltage multiplier block in the 5062C ion
pump supply. If I
remember its 3 diodes and 3 caps. If you'd like I'll dig it up for you so
you
can repair your module.
Corby Dawson
Click here for free
overtemp resistor. This is the value the Navy uses to get the
last bit of life out of the tube, don't do it if you can get the rated
beam current at the original value!)
If you email me I can give you my evening phone number if you need some
more info.
Corby Dawson
[EMAIL PROTECTED
Tim,
The ion pump supply should be on if the unit is plugged in and on.
Remove the HV connector from the supply to remove any load and measure
the divided test point on the bottom of the chassis.
It should read between 2.45 and 3.0 VDC, if not measure from pin 4 of the
ion pump supply to
Jeffery,
No the FTS 4060 does not use an HP 5061B tube (physically too big!)
However a 4060 tube can be used in a 5061A/B with a little work.
Corby Dawson
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current (with very
discharged batteries) is very low. The batteries charge fine if a bench
supply is used instead of the MRT supply.
Anyone have a copy of the manual or can supply the schematic of the power
supply and charger?
Thanks,
Corby Dawson
to ground, will read open until locked and then
read a low value when locked.) or it could be wired to give a TTL level
output when locked. Lamp voltage shopuld be 8VDC. Hope this helps.
Corby Dawson
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