Thought I'd give a heads up concerning a nice HP 5065A that I will be
offering for sale in the near future.
It has the Patek Philippe analog clock and is in pretty good condition.
Fully checked out and aligned!
Plot against a Hydrogen Maser looks great and beats the original HP specs
handily.
Hi,
I have a 05360-60051 circuit board from an HP 5360A that I'm scrapping.
I just need the HP part number of the transformer on the board to see if
I can use it in another project.
Can anyone help?
Cheers,
Corby
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Hi,
I'm going through my collection of 10811 variants and listing them on
ebay over the next couple months.
Two 10811B are listed now. Watch user ID corbymite.
Cheers,
Corby Dawson
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After reading about how the BVA oscillators avoid the problems of on
crystal electrodes I was wondering if anyone has tried to optically
excite a quartz crystal in an oscillator?
(Use a modulated laser to drive the bare crystal, and a photodetector
setup to detect and provide feedback?)
Seems
Hi,
I'm selling a nice PRS10 on eBay if anyone is interested.
With manual and schematics.
Works great!
Cheers,
Corby Dawson
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John,
I believe that the unit referred to is a Tracor 308A.
I no longer look to play with the Tracor units (304 308 600 900) as their
performance does not merit putting a lot of work into them. Thanks for
the heads up however!
The eBay # for the PRS10 is 321402060170
Corby
Hi,
I found two PLCC STEL 1175 in a rack mounted synthesizer I have.
I'd be willing to sell the chips.
Would they work?
Cheers,
Corby
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Recently I have been testing some Quartz oscillators with
exceptional stability. (low parts in 10-13th)
I've noticed something that jumped out at these performance levels!
Normally I test oscillators on a DMTD system with either
an ultra stable Quartz or a Hydrogen Maser reference.
On these
Hi,
I'm looking to see if anyone has any 10811 oscillator interface boards to
spare?
Two boards and a frame that accepts the 10811 and outputs 5Mhz.
Used in the HP 105 5061A/B and 5065A.
Interested in the whole thing with oscillator or just the two boards or
just the bigger rectangular board
Hi,
I usually don't use drift removal as I want to see the effects of drift!
The effects of oscillators locking together are very apparent on both the
phase and AD plots when using a DMTD system. There was no indications of
such locking!
My point was that if you are measuring ultrastable Quartz
Hi,
When I print an Allan deviation plot from Ulrich's Plotter program the
box with the values gets superimposed on the chart and the top 5 or so
values get chopped off!
Anybody know how to correct this?
Thanks,
Corby
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I'm trying to built a DC to DC from an existing schematic for a frequency
standard I'm working on.
The transformer core is identified as an Indiana General F1152-1-6
The Dc to Dc is running at 22Khz and maybe 20 Watts.
Can't find any info that would allow me to decide on a proper substitute.
Thanks for the inputs everyone,
One of the direct replies got me the data I needed!
Alex, I'd like to by it that way, but A 24VDC input 3700VDC output at 4ma
does not seem to be available!
Cheers,
Corby
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Hi,
Anybody have the mechanical data for mounting a Lambda LRS-54M-24 power
supply?
It has to be the M type.
I believe there are 6 holes on the bottom and I need to know the spacing
of the holes.
BTW thanks again for all the DC to DC converter info!
Cheers,
Corby Dawson
Hi,
I have a small quantity of good used FRK/M100 lamps I am getting rid of.
Offering here prior to eBay.
$45.00 each which includes shipping in USA.
Contact me off list.
Cheers,
Corby
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Well, I bet that got your attention!
My Hydrogen Maser kit arrived recently.
It's a surplus Sigma Tau VLBA-112 with an unknown physics package problem
that has had its power supply modules, RF receiver modules, synthesizer
and cavity servo tuning modules, and a couple other bits removed for
Hi,
I'm working to replicate an oven controller and the schematic I have
states to check the leakage resistance of the .01uf integration capacitor
at 50 degrees C.
That is the oven temperature.
What would be considered good at that temperature and how would I measure
it?
Also what type
Hi,
Any time-nuts also 4hv.org members.
Cheers,
Corby
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Hi,
I came across this phenomena when transmitting with two 5KW transmitters
via separate parabolic antennas to a satellite.
If the phase of the TXs was correct the received signal at the satellite
was 6db hotter!
I thought at the time that it was due to the power adding in the voltage
mode.
Came across this.
Might be relevant.
Cheers,
Corby
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930008868.pdf
a) Greater than 100% power combining efficiencies have been realized as
predicted. This implies that the output power from the combiner is
typically greater than
the sum of the
Sebastion,
Let the unit warm up for 10 minutes, then power down and then try the
lamp removal.
It turns CCW to remove.
Use a BIG screwdriver!
Cheers,
Corby
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Sebastion,
Try swapping the lamps and see if the loosing lock problem follows the
lamp!
Corby
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See the link for the latest progress!
http://www.leapsecond.com/corby/maser/
Cheers,
Corby
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Coating the bulb with Teflon involves coating the inside with a Teflon
liquid aqueous dispersion, letting it dry, and then curing it in an oven
at 380 to 400 degrees C for around 30 minutes while circulating dry air
through the bulb.
A little bit intricate but doable. Main concern is getting the
I'd be tempted to experiment with other methods of bulb coating but the
time and effort in disassembly, re assembly and testing is so great that
I'm going to use a tried and true method to increase the chances of
success! It's definitely NOT just as simple as screwing in a different
light bulb and
Chuck,
The coating opposite the entrance to the bulb was degraded to the point
that it was missing over a large area and the tiny particles of loose
Teflon were free to move about in the bulb. (Rolling the bulb you could
see a little pile of particles moving about) Since a majority of the
You could use a SOIC to DIP adaptor board with a couple logic and FF
elements in the Potato Chip Family.
See:
http://www.potatosemi.com/
Cheers,
Corby
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Hi,
I'm currently using a GWBasic program at 9600 Baud to get 1 second T.I.
data (12 digits) from an SR620 counter, display the reading , put the
reading into a file, name the file sequentialy, and either save or delete
the file via a function key.
I'm switching to a new counter that outputs at
I got my dinosaur up and healthy again.
The code Ed Moxon suggested worked great with some monor tweaks to my
program.
10 'run gwbasic com port at high baudrate by poking divisor latch
100 OPEN COM1:9600,N,8,1 AS 1 '9600 is 115200/12, so latch is now 12
110 UBASE = h3f8: LCR=UBASE+3 'uart i/o
Edgardo,
You do use the C-field adjust to put a 5065A On frequency. The Factory
values are a moot point after all these years!
Just incrementaly adjust the c-field control in small steps while
observing the frequency comparison.
The only thing that might happen is that you reach one end of the
It's been a few years since I really dug into the FRK and M100 but I do
remember this particular common problem.
You power the unit up and after the normal warm up period it locks and
stays locked.
Then if you cycle the power the Lamp refuses to light.
Has anyone figured out the most likely cause
Bill,
When plugged in cold and after the lamp starts I can cycle the power and
the lamp will re-ignite up to about 4 minutes into the warmup.
After that the lamp won't start.
Maybe the lamp heater is set too hot or the lamp oscillator is heat
sensitive?
Corby
Hi,
I've had these a while and have decided to sell them.
Two bare PICTIC II boards. The version with the 16 pin DIP 74AC175.
Take them both for $11.00. (shipping included in USA)
Thanks,
Corby
Woman is 53 But Looks 25
Mom reveals
They just sold!
Thanks everyone.
Corby
Woman is 57 But Looks 27
Mom publishes simple facelift trick that angered doctors...
http://thirdpartyoffers.juno.com/TGL3141/5086e65285d0c66524b86st01duc
Hi,
Check this one out! I think it might work as long as the +5 volts can
source the oven current required.
Your part was 20ma.
This one requires About 250 ma during warmup and between 80 and 130ma
afterwards.
http://www.ebay.com/itm/310380778466?ssPageName=STRK:MEWNX:IT_trksid=p39
Thought I'd repost this with a different subject line as I think more
members will see it now!
Found this neat mini Ovenized VCXO on the auction site.
Check out item # 310380778466
and the data sheet at:
http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317-
After the degauss you should recheck the Zeeman setting, which you did.
You also verified the synthesizer frequency is set to the frequency that
requires a C-field current high enough to reach 53.53.
Since it is running at 48.21 you should increase the C-field setting
until the central peak
Bob,
Modern Rubidium units like the PRS10 Have a lamp life of over 20 years
(of continuous operation).
Vintage HP 5065A units likewise had a very long lamp lifetime.
All the other common failures are just in the electronics.
The main interest for time nutters is how long will the lamp last in
Bob,
Rubidium lamps are purpose designed for particular units.
However The Efratom threaded ones are mostly interchangeable.
I'll see about taking a PIX of a variety of lamps and posting it.
Something along the lines of the Rubidium Cell PIX I took at:
MINI-TIC for DMTD work
Hi Everyone!
I've been testing a Miniature 2 channel TIC that Bert Kehren and Juerg
Koegel
and Richard Mc Corkle have designed.
It has 9 digits/Sec. and with a 1HZ offset in the DMTD unit gives a
resolution of 1X10-15th at 10 MHz, 2X10-15 with a 5 MHz input, when
As Bert mentioned once the amount if interest is established purchase
details will post.
We also will post a FAQ for this project.
Thanks,
Corby
The New #34;Skinny#34; Fruit
How This Strange 62-Cent African Fruit Is Making Americans
Attached is a block diagram of how I am using the MINI TIC.
I use a wall-wart feeding two DC to DC convertors for the +- 5VDC.
The dual one shot IC is an LS221 that drives two LEDS.
I used LS14 schmitt triggers on the input as their trigger level closely
matched the pulse transformer output of
Hi Everyone,
I'm selling my SR620 and thought to offer it here first before the eBay.
The only problem I know about is an error 3 on power up.
This equates to the battery backed up RAM not holding its load.
The battery checks good so it's probably the RAM chip itself.
You can then select a
Thanks for the interest the SR620 is sold.
Corby
Woman is 53 But Looks 25
Mom reveals 1 simple wrinkle trick that has angered doctors...
http://thirdpartyoffers.juno.com/TGL3141/50b68d00e6768d0043bast03duc
I'm selling a few of these cards. See eBay item 321033088669
I also have a quantity of the bath tub style from HP 5061 Cesium
standards. (If I remember 5, 8, and 3uf available)
Built specially for long time constant integrators.
Corby
Pete,
The more likely singing offender is the old style A11 oven controller
module.
It also is off in the Cs off mode so the singing should stop when in that
mode.
The newer style A11 modules do not sing!
Corby
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The HP sceme in the patent refers to an array of series and parallel
diodes to reduce noise.
Just paralleling them does not reduce the noise!
The 4 paralleled in the 5065 are to give enough phase deviation for the
low modulation level applied. (150mv)
The symptom was a fluctuating 2nd
Merry Christmas everyone!
I have taken some PIX of a disassembled HP 5065A optical unit for your
pleasure!
Tom Van Baak is hosting them at
http://leapsecond.com/corby/5065a-optical/
Enjoy
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Hi,
I've been playing around with 2 HP 5065A standards to see if averaging
them will give better stability.
The results so far are:
1 sec10 sec100 sec
unitA1.28-123.83-13 1.33-13
unitB9.31-133.44-13 1.18-13
combined
John,
Injection locking won't be a problem with the isolation I have in the
setup.
Azelio,
The 1 second results are referenced to a cherry picked FTS 1200 quartz
which is better than 3X10-13th at 1 second.
The 10 and 100 second results are referenced to an EFOS2 Active Hydrogen
maser.
After
Don,
The only lamps besides FRS lamps I have had to rejuvinate were HP lamps
that the oven had run away on forcing all the Rubidium out into the bulb
and coating the walls.
The design of most standards insures that the base of the bulb will cool
faster than the bulb when turned off thus
Tom is hosting some rubidium PIX on his http://www.leapsecond.com/
website
http://www.leapsecond.com/corby/rb-lamp.htm
http://leapsecond.com/corby/5065a-optical/
http://www.leapsecond.com/pages/rb-cells/
Enjoy!
Corby
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Also about ensembles,
http://www.mksa.deit.univpm.it/biblioteca/sala_tecnica/scaffale_strumenti
/Campioni/EPSG070861.pdf
This article describes combining 4 HP 5071A standards.
Description on page 2 and block diagram in figure 2.
Unfortunately no details on the controller are given!
It's what
A few years ago I posted the short term stabilities of some HP 5065A.
Here is an updated list with some more results. The 1 sec figures
with a * indicate a maximum. The actual 1 sec results for those units
will be better.
The 1340A unit was exceptional!
1 SEC.
Tom,
My setup consists of:
NBS 106B DMTD unit that I have upgraded a bit
A selected FTS 1200 as an offset oscillator
Berts mini counter RS232 interfaced to a laptop
for the 1 sec taus without the * the reference is a cherry picked
10811
for the others as well as the higher taus the reference is
Here is an update of measurements of some Quartz short term stabilities.
It's interesting to see that the 10811-60111 that some turn their noses
up
at can turn in excellent stability as well!
QUARTZ 1 SEC. 10 SEC. 100 SEC. 1K SEC.
Hi,
I've placed a couple FTS 4060 parts units on ebay if anyone has an
interest!
Thanks,
Corby
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Hi,
I put up an FTS 1000A/100 oscillator on the eBay. Stability day in the
PIX.
Corby
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Sorry here it is!
Item number:
321062141056
Corby
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Ok I've been plotting my oscillators for years using Allan Deviation.
That way all my records can be compared easily.
Is there any advantage to using Modified Allan Deviation?
It seems to give a better stability plot but that just seems to be
cheating!
If I plot both ways what do the
Stewart,
Tracor units use a high voltage pulse to start the lamp. You should be
able to hear the relay that drives the pulse clicking around every 10
seconds or so until the lamp lights up.
Tracor lamp failures are not rejuvinatable (is that really a word).
However I have in the past
Hi,
See my FTS oscillator I'm selling. item number 321080604271
Corby
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Very high gain front end. It's a saturating amp rather than a
comparator.
Wonder how it would work as a DMTD front end?
Corby
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Hi Everyone,
Does anyone have the change sheets that apply to the prefix 2816A.
I only have the one that covers up to prefix 2740A.
Thanks,
Corby
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OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I call it the SUPER HP 5065A.
Any of these links will get you to the document describing it.
Have a look and see what it's all
Brook,
It's all done with mirrors! No lenses.
A reflector at the lamp end and a tapered mirror at the photocell end.
I'll see if I can post an outline drawing.
Corby
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Attila,
When researching ways to improve the 5065A (AKA the SUPER 5065A) I
considered using a laser.
However the long term operation is hard to optimize.
Tuning the laser is a combination of temperature and current to select
the proper line. (and optics if you use a grating tuning)
It's
Bob,
The new style A3 uses the same input and slighly modified output stages
from the original.
The multiplication from 5 to 60 Mhz is done entirely different.
I have two scans that copy the schematic but they are way big in size.
I'll experiment and try to make them small enough to email.
Hi,
The New style A3 is in mainframes with SN prefix 2644A and above and has
series 2644 on its label.
I'll see about getting the schematic and theory page posted where
everyone can access it.
Corby
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Mark,
Hi, while?skimming some articles I found re GPS satellites, I found some
references to?certain buffer gasses in Rb cells working much better?with
optical filters than others.???
Can you reference the article?
The enhanced performance with optical filters can usually be tied with
Late model HP5065A an the bay site went for $4650.00!!!
Guess I'll fix up my hanger Queens and list them!
Corby
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My 3325A is having intermittent resets back to the power on default
values.
I ran across a reference to service note 3325-18 that relates to it. (my
SN is in the range the note specifies.)
Does anyone have a copy of the service note or know where I can access
it?
Thanks,
Corby Dawson
See item 281136145727 on eBay.
Might be nice for WWVB experimentors!
Corby
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I see an FE-2266A oscillator (120Mhz) on eBay.
Does anyone know what it was used in.
Just wanted to see if the pinout and power supply rating could be
determined.
I'm looking for a 60Mhz or 120 Mhz OCXO preferably with EFC
Thanks,
Corby
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Hi,
I'm looking for 3 scales for the HP 8620C.
2-6.2 Ghz
6-12.4 Ghz
2-18.6 Ghz
I have an extra 12-18.6 to trade?
Thanks,
Corby Dawson
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Jerry,
The 4700A was one of the very first Rubidium standards made.
The V-4700A came first and had the distinction of having a lamp discharge
oscillator that used two submini vacuum tubes in a flip plop
configuration! It was rated at 10,000 hours.
The X-4700A had the more familiar transistor
Anyone have a pinout and power supply requirements for a frequency
electronics fe-2129b 5 Mhz oscillator???
Thanks,
Corby
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Hi,
Anyone have top and bottom covers from a junked HP 5061A or B (also
5065A)???
I have LOTS of 5061 parts for a swap or can pay a reasonable amount.
Thanks!
Corby Dawson
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Paul,
The datasheet says it should lock in under 6 minutes.
You may have the lamp assy problems that have been posted before.
Corby
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Don,
I did reply to your email address the other day and just resent it
again.
Let me know if it does not show up!
Thansk,
Corby
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Hi,
Reading over an old brochure for the HP 10544B and it touts the use of
natural Quartz for the crystal.
Anybody know when they switched over to grown Quartz I.E. late 10544 or
when they went to the 10811??
Thanks,
Corby
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Hi,
I'm making some phase mod index measurements as it relates to Rubidium
and Cesium standards.
Two questions.
1. Is a Bessel table for sine wave modulated FM used for PM also?
2. Where can I find a Bessel table that has fine resolution, the ones I'm
seeing only have large increments of Mod
Hi,
I'm working on a Varian 921-0062 ion pump controller for the pumps used
in a Maser.
I just got it in and it is wired for 240 VAC and I want 120VAC.
My manual and the ones I can find on line show a power TX with 4 input
terminals which they show how to strap for 240 or 120 VAC.
My unit
Here is the deal.
The 4 terminal TX wiring is pretty obvious. (I have a unit with the 4
terminal to compare with)
The 6 terminal I have ohmed out and it is not obvious!
Pins 1 to 3 and 2 to 4 (.5 Ohms) appear to be the 120VAC windings and
hooking them in parallel should do the trick.
As wired
Thanks for the inputs!
I ended up disconnecting the TX and powering up the windings separately
to figure out the wiring.
The wire on pin 8 did indeed to turn out to be mis-wired!
The added taps allowed for 120/240 or 100/200VAC inputs.
Got it wired back up and it's working fine at 120VAC now!
Adrian,
Most used High stability tubes are DOA but you might get lucky!
You say the low frequency test worked.
What was the amplitude of the peak in nanoamps and was the peak well
above the noise or baseline level?
Once you were on the peak did you adjust the 41.6Khz amplitude to max the
Adrian,
You can use either Zeeman frequency as long as you use the corresponding
A1 frequency synthesizer setting.
See: http://www.febo.com/pipermail/time-nuts/2005-April/018171.html
This does not matter for troubleshooting but once you want to get on
frequency they need to match.
Corby
Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes
or instruments with tubes are exempt from the Hazmat requirements if
shipped within the USA. You still have to label them per the instructions
and as stated you are considered trained If you understand the
instructions.
The military, who used the most 5062C, Actually had an maintenance note
about increasing the Cesium oven temperature to get the last bit of life
out of the tube.
On the 5061A/B tubes the STD tube runs at 85C and the high perf. at 115
to 132 C (marked on tube label) You can measure the temp by
Tom,
On the 4060 you can easily monitor the Ion pump voltage and current, the
electron multiplier voltage, and other important parameters by measuring
the voltages on the U1 chip on the uP board.
This saves you fronm having to diconnect stuff to measure the HV and
such.
If you don't have a manual
Adrian,
You say it does not lock.
When you put in operate and push the logic reset button does the green
light come on?
What is the 2nd harmonic meter reading?
If too low the logic will not turn on the green light. Raise the reading
via the A7 gain adjust thru the front panel hole.
Is the
Hi,
I used to have notes on how to select which output frequency the EGG
RFS-10-7 provides but I can't find them!
It can be 5 or 10 Mhz.
Does anybody know where the selection is made?
Thanks,
Corby Dawson
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Hi,
I have a PATEK PHILIPPE clock from an HP 5065A.
It appears to have an intermittent connection internally on one of the 3
wires.
Anybody know how to take the case apart with damaging anything???
Thanks,
Corby Dawson
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It came apart easier than I thought!
Remove the knob on the rear, break the RTV in the hole the wires go thru,
carefully pry around the edge while pushing on the shaft the knob was on.
Will install new wires and try it out.
Hooray!
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Try looking here.
http://www.cliftonlaboratories.com/z1_buffer_amp.htm
This opamp buffer has 80-90db isolation.
Corby
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Well it's that time again to ask HP 5065A owners if they have early or
late SN units.
If you have a unit with a SN below 916-00181 or above 2816A01697 please
let me know.
Merry Christmas and an accurate 1PPS to all!
Corby
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Stan,
I keep a record of the HP5065A serial numbers I come across.
Just for fun I'm looking for the first and last units made!
Corby
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Hi,
Thanks for the replies on the HP 5065A serial numbers.
Some have expressed an interest in my list of known HP 5065A SN.
I'm getting it together and will post it soon.
One tidbit is that SN prefixes of 0928-X and below did not have the
TED installed.
This makes de-flooding the cells
As promised here is a list of all the HP 5065A
units I have come across.
I believe there should be a 08xx prefix out there
as the units first came out in the middle of 1968.
I also think that the 2816A prefix is the last
prefix used.
Anyone have any others I can add to the list?
Another tidbit,
Paul the C-field current is the same for the 5061A and 5060A.
The 5060A C-field pot has LOTS more range than the later 5061A where they
installed resistors on each side of the pot to reduce the range.
Corby
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