[time-nuts] LT1016 as a pulse shaper...

[Ulf Kylenfall via time-nuts]

 
Gentlemen,
I have so far been using LT1016 as a pulse shaper and also whenever I needed 
toconvert a sine wave into TTL Logic levels. Some hysteresis and all the 
decouplingand layout precautions as recommended by LT.
Are there any similar or better alternatives out there that could be usedthat 
would provide lower jitter and that are less expenceive?
Ulf Kylenfall
SM6GXV
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[time-nuts] 5065's out there...

[Ulf Kylenfall via time-nuts]

 
My two units:
848-00131Replaced Rb cavity all together with fresh electromechanics from 
-00107 unit.Also replaced the AC Amplifier with later (improved) version copied 
from HP manual.
836-00107Scrapped since someone robbed it of the Quarz oscillator.The Rb 
cavity was used in -00131 above. The cavity was of a newer batchand had the 
light brown-greyish color of later generation HP instruments.Will use whats 
left of this unit for parts.
When salvaging parts I noticed that the RX cell SRD driver module did nothave 
any output and that someone had tried and failed to open the unit.
I experienced the same thing. My own "first" unit failed after having beenin 
operation for a week. I replaced the final (TO-5) transistor with a 2N5109and 
one of the other FET's with a 2N4416. This was exactly the samefaults in the 
scrapped unit's driver module. Possibly why that one was cannibalised 
anddecomissioned.
Ulf Kylenfall
SM6GXV




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[time-nuts] HP 105B: Modern replacement for NiCad battery pack?

[Ulf Kylenfall via time-nuts]

 
Gentlemen,
I may have asked this question before...
I am looking for a modern replacement for the NiCadbattery pack used in the HP 
105B. One such 105that I salvaged have been standing on a shelf with 
thebatteries "happily boiling away".
So, what kind of chemistry would be possible to usewithout to much re-design of 
the charging circuitry?
Ulf Kylenfall
SM6GXV

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[time-nuts] HP5065A AC-Amplifier (A7) Improved (?) version...

[Ulf Kylenfall via time-nuts]

 Gentlemen,
I have assembled (what I hope is) an improved version of theA7 AC Amplifier of 
the HP5065A. It has been installed inmy (1968) model of the 5065A and it is 
working.
The documentation has been uploaded to the KO4BB manual site.
73
Ulf KylenfallSM6GXV
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[time-nuts] Regarding the improved integrator A9 in the 5065A...

[Ulf Kylenfall via time-nuts]

 Regarding the improved integrator A9 in the 5065A
Rubidium FStandard. (Series 2632)
I have copied some of the improvements (?)that HP made to the 5065. The A7 
AC-Amplifierand the A9 Integrator. Regarding the A9 Integrator:
I noticed that there is nothing that prevents
the [-EFC] signal from going positive in the
improved OPA111 design. 
If the XO in the 5065A
is an old 00105-6013, the series resistances
to the varactor in the XO Assembly
amounts to ~70 kOhms which should prevent the
varactor CR1 from forward current destruction.
In the 10811-version I can see 100 kOhms.
How does these oscillators behave should the
-EFC signal swing the full +/- 15V that the
OPA111 is capable of? Does it stop oscillating?


Will 15V reverse polarity destroy the varactors?

I have added two zener diodes to the output
after R3 (21K5) in my design which will 
prevent the [-EFC] from exceeding +/- 5V 
but the question is if the diodes needs 
to be populated or not.

Comments Invited.

Ulf Kylenfall
SM6GXV
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[time-nuts] Oscilloquartz 8600-3 Disassembly pictures...

[Ulf Kylenfall via time-nuts]

 
Tried to mail the pictures to Magnus. The mail bounced back.
Ole Petter Ronningen was kind to also offer space for themand they can be found 
at:

www (dot) efos3 (dot) com/osa8600-3

73
Ulf Kylenfall - SM6GXV
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[time-nuts] Oscilloquartz 8600-3 End of range...

[Ulf Kylenfall via time-nuts]

 
Ed,
I am inclined to beleive you.
I have not found any RF-wiring into the "core".Only what seems to be heater 
flex cable.
A small part of the heater winding can bee seenin the gap where the flex cable 
is routed to theinnards.
The only way to learn the truth will be to unwindthe kapton tape and from there 
unscrew the lidand see if the oscillator really is inside.
Magnus got some pictures. He can upload themwhere he see fit.
I tried to go to the Photobucket site. It attacked me...

73
Ulf Kylenfall - SM6GXV
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Re: [time-nuts] End of Range Oscilloquartz 8600-3 (Pictures)

[Ulf Kylenfall via time-nuts]

 
All,
I have some pictures of the disassembled unitas of the state of it right now.
Where can I upload them?
73
Ulf Kylenfall - SM6GXV
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Re: [time-nuts] End of Range Oscilloquartz 8600-3

[Ulf Kylenfall via time-nuts]

 

Emailed Oscilloquartz that now has another name: Advaoptical... This in my 
capacity as aresearch engineer at Onsala Space Observatory.And the oscillator 
is at my work bench. Nothingprivate/hobby about this.
The answer was that since we do not have a service agreement,they would not 
disclose any information.
(Compare this with Keysight who has a free downlad area for oldmanuals. IMO the 
Keysight approach benifits their businessin the long term).
So...
I went along and started to dissassemble the 8600-3.
The outer case was easy. Inside is a PCB with RF buffersand temperature 
regulation circuitry.
Then there is a thermo bottle with the ovenized oscillator.This unit is 
connected to the PCB using two flex cables.
The oscillator unit can simply be extracted from thebottle using an Metric 3 mm 
screw lightly screwed inone of the holes in the oscillator assembly.
The assembly can be accessed by carfully unscrewingthe flex-cable end from the 
other mechanics. No needto touch the three small screws at the lid.
Now it is starting to get intersting. I have not foundthe RF wiring into the 
crystal. The PCB in this unitseems to deal only with temperature 
regulation.Possibly, the RF is routed together with some heaterwinding.
Or the crystal and the oscillator parts is sealedin such a way that there will 
be no wayto dissassemble it. There are several thermistorsglued inside to 
various parts of the oscillator/ovenassembly. That will make any further 
attemptsdifficult as the connecting wires are thin and delicateif they needs to 
be unsoldered.
The construction is a nice piece of engineering.I'll give them that.
Right now, I cannot see any typical oscillatorcircuitry (pF, nH, RF 
transistors) etc.
I think I'll contemplate on the next movefor a day or so...

Ulf Kylenfall 



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[time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

[Ulf Kylenfall via time-nuts]

 
Gentlemen,
We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted into 
5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning coarse/fineadjustment 
potentiometers cannot bring the frequencyinto its specification.
Oven temperature is about + 80C accordingto the thermistor and the operating 
voltageis at 24 VDC.
Have Googled but the only thing that turns upis datasheets w/o any details.
Before I take it apart and start lookingfor obviously broken components, 
isthere anyone that has a CLIP on this unit?
73

Ulf Kylenfall - SM6GXV
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Re: [time-nuts] HP5065 - Some OP-Amp, FB and Teflon

[Ulf Kylenfall via time-nuts]

 
All,
Your comments regarding my hobby project are appreciated.
The story behind the first 5065A that I was able to bring back to life was that 
I encountered it when I was 13 yearsold in 1968, taking part in the schools 
intern programme (first experience about what a job was and what engineersdo in 
their work). I was given a tour of the Onsla Space Observatory and the 5065A, 
the pride of the observatorywas shown to me. (I was not allowed to touch it.) 
In the late 90's it was decomissioned because of the burned Rubidium 
cavityheater and would eventually have gone into the recycling container had I 
not salvaged it almost 50 years later.

(I found the OPA111 link in one of the answers in the thread and purchased the 
remaining 3 pieces.)
Ulf - SM6GXV






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[time-nuts] HP5065 - Some OP-Amp, FB and Teflon ...

[Ulf Kylenfall via time-nuts]

 
Corby,
Thanks for the information. I was not aware of the relocated resistor.
Yes, it is the DC feed-throughs.
Any thaughts on a possible replacement for OPA111?
I have also duplicated the revised A7 AC-Amplifier boardusing film capacitors 
for the notch filters and modernOP-Amps. Since I have one old A7 board as 
spare, I caneasily compare the performance.
BR
Ulf Kylenfall - SM6GXV
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[time-nuts] HP 5065A - Some OP-Amp, FB and teflon stand off questions...

[Ulf Kylenfall via time-nuts]

 
About to start repairing a second 5065A. Gathering parts.
1.

Looking for a replacement for the still available but very expenceive OPA111 
used in later versions A9 Integrator of the HP5065A.
There are indeed some candidates at Digi-Key, but when the selection of max 
Input current, offset voltage and supply voltage is set, there are not that 
many left. So - which parameters are the most crucial for the integrator?

2.
Looking for data on the Ferrite bead HP 9170-0029. Any suggestion on a suitable 
equivalent?
3.
Looking for the teflon single pin feed-thru connectors used on almost all 
modules on the 5065.
Best Regards
Ulf Kylenfall - SM6GXV
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[time-nuts] Regarding Wenzel PLO's

[Ulf Kylenfall via time-nuts]

 
We have a couple of them at my work.

5 MHz in, 100 MHz out. The Kvartz HM75-01Hydrogene masers has a 100 MHz output 
but thatport is full of spurs, so we use Wenzel PLO's thatprovides a Clean 100 
MHz signal from the 5 MHzoutput from the maser.
Know then that the Wenzel PLO's are sensitive to the input Power levelof the 
external reference. The datasheet says one thingbut  the phase noise  of the 
locked output signal won't look very good at allif the Reference Power is 
approaching the maximum specified input level...


Ulf Kylenfall - SM6GXV
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[time-nuts] Continously drifting HP 10811...

[Ulf Kylenfall via time-nuts]

 
Gentlemen.
I am about to try to repair a second 5065Aand have now tested a number of 10811 
Quartzoscillators that was in the junk box.
In order to test the 10811, I put them it in a chassisthat is used for 
GPS-locking. Adjust for lockand then monitor the EFC-voltage over time.
Starting out with a lock condition and the EFCvoltage adjusted to -2.500V I can 
see that theoscillators exhibit a monotonus EFC voltagedrift towards 0 volts. 
About + 1 mV in 3 minutes.
By comparison, I have a 10811-60109that was tested in the same GPS-application 
andthis unit is rock-steadyand that does not show any sign of EFC drift.
Test time has been 3 Days, and I beleive thata 10811 should have been able to 
reachthermal equilibrium during this time.
I can and will (of course) take them apart.Anything special to look for other 
thanthe usual signs of long-term over-heated discretes?
Ulf Kylenfall -  SM6GXV 
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[time-nuts] Fast Rise/Fall-time pulser

[Ulf Kylenfall via time-nuts]

 
In our activities in radio astronomy, the need for precise time calibrationwe 
use fast gates like HMC672LC3C from Hittite.
(Has perhaps been superseeded by newer devices)
My 5 cents
Ulf Kylenfall - SM6GXV
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[time-nuts] 5065 Repair - Progress

[Ulf Kylenfall via time-nuts]

 5065A Repair - Progress...

As I wrote in an earlier mail, the restored 5065A
died (slowly), dropping the 2nd Harmonic reading
below 10 after which it lost lock.
I could not see any o/p signal coming from A7
so in a moment of confusion, I opened the Rb cavity
RX part to see if there was a loose connector inside.
Originally, I had written down the number of turns
used to remove the Rx, but I later realized that I 
had not been to careful when inserting the Rx again.
More about that below.
At first I took the 274Hz amplifier A7 apart, put it on the
lab bench and found the DC balance to be (badly/off scale)out of spec.
That caused me to replace one of the input transistors
that was indeed bad, and also the 709's with 741's after having
removed the frequency compensation networks.
A 1nF capacitor between the (+) and (-) input
of the 1st OPamp reduced the output noise considerably.
(Tested with 100 nF w/o any adverse effect on the output).Then I discovered 
that there was no 60 MHz SRD Rx pumping
power. 
This was caused by one of the JFETs in A3 gone bad.
Replacing it with a 2N4416 increased the o/p power but not enough.Replaced the 
final transistor Q9 with a 2N5109 and then the unit
produced +20dBm. Made a complete recal of A7, A3 and A8, replacing
A8R8 with a 10-turn pot. (Made the 274.0 Hz adjustment easier)
Having put back both units, the 5065 was able to lock but
with a reduced 2nd Harmonic reading. Obviously I had
missed inserting the Rx unit back into correct position.I then decided to try 
to tune the Rx cavity, which I did by
removing the RV ass:y, connecting it to extension cables 
and opening the Rx part, loosen the fastening and rotate
it and check for maximum AC. This was successful. The peak
was not extremely sharp, but the difference could be clearly
seen on an oscilloscope. (I also noticed that this procedure
should best be carried out using as little surrounding
light as possible.) (Are there no instructions how to do this"Professionally" 
out there?)

After reinsertion, the 2nd harmonic level was back to
what it was at first (~30), and the unit locked nicely.
(...Sigh of relief...)
Today I took it to my work, left it on during the better part
of the day, did fine frequency adjustment (Mag Field) against
the Hydogene Maser and the connected it to a Symmetricom 5120A
using the H-Maser as reference.
At first, the Allan Deviation exceeded HP's original specification
by almost a magnitude at 100 seconds, but as the time
 progressed, that reading went from 2E-11 at 10E-2 seconds
to 8E-13 at 100 seconds (minimum) going up to 2E-12 at 1H 26 minutes.Phase 
noise starts at -20dBC at 1E-3 Hz, -100 dBC at 1Hz offset,
then -150 dBC at 10E3 seconds (flatterns out there).
As far as I can tell, and if I dare to trust the Symmetricom instrument, the 
old 5065 seems to be working.
As I mentioned, I have also acquired a second unit, unfortunatelypartially 
scrapped. It hard to resist trying to fix that unit as wellbut then I need to 
look for a 10811 quarz unit for it.
Ulf Kylenfall    SM6GXV

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[time-nuts] Restoration of a 5065A - Continued

[Ulf Kylenfall via time-nuts]

 
The second scrapped 5065 that I manage to acquire could perhaps be braughtback 
to life. I already have a supply of electrolytic capacitors but I have my 
doubtsabout the 1.33K resistor that is used in the RV TX assy. It maintains the 
original value, but the protective surface is gone.
Digi-Key sells a 1/2W 1K33; CMF1.33KHFCT-ND, but I suspect that this 1/2 W 
ratingis at 25C. The resistor used in the RV TX pcb is considerably larger.
Can someone tell me where to get them? Corby Dawson was kind enoughto supply me 
with "47 Ohms" of kanthal wire and a 1.33K resistor, but sinceI have "sort of 
started to collect 5065's", I cannot ask for such favors over and over...
The second question is about the RV Receiver in the unit that has beenrestored 
. The 2nd Harmonic level is so lowthat the repaired original instrument seems 
unable to maintain a lock. In the beginning of thelong-time test, the reading 
was steady at 30, and I was able to adjust theRV synthesizer/Magnetic field so 
that I had an absolute 0.0 degree phase shiftover more than 30 seconds when 
comparing the 5 MHz to one of our H-Masersusing a vector voltmeter.
The 709's in the A7 AC-Amplifier has been replaced with 741's (removed the 
frequency compensation networks) but added a 1nF capacitor between(+) and (-) 
input on the first amplifier, thus reducing some noise and instabilityon the 
output signal. The unit was then calibrated and it has beenadjusted according 
to HP service manual.
After re-insertion, the test instrument readings are about the same as 
beforethis modification. PhotoCurrent at 30, and 2nd Harmonic starting at about 
10,increasing slowly during the on-time hours and is now 15
The unit lost the lock at about that level last week

The 137 Hz generator is at 136.87 Hz (varying by perhaps 0.25 Hz)
The PhotoCell was "formatted" using a hair dryer according to instructions.
Can I expect the 2nd Harmonic level to increase until the unit acheives lock or 
shall I remove the RV Photocell and put it in a temperature chamber?We have one 
at my work that can keep temperature quite accurately.
Or should I leave the instrument turned on and let it "sweat it out"?
Ulf Kylenfall
  SM6GXV




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[time-nuts] Restoration of a 5065A - Continued (Ulf Kylenfall)

[Ulf Kylenfall via time-nuts]

 
Picked up a scrapped 5065A tonight.
It was an early unit but a later one than the one I amtrying to fix.
The XO was gone. From what I could see, it had beena 10811 type with adapter 
since there was no 115V wiring.
The RV Cavity was loose and I think that what was in this unit mayhave been a 
replacement since it featured the more modernbrownish color. It also had the 
Thermo-electric devicein the receiving end.
The RV cavity circuitry checked out OK. No shorts.  Resistances was OK too.
The TX lamp had a slight golden/brownish glass color.It did turn on about 20 
seconds after applying DCpower to it.
What does the community say: Can the lamp still be useableas a spare, or is the 
color a sign of end-of-life?
I am considering either use this instrument as spare parts or tryto fix this 
one too...
Ulf Kylenfall  - SM6GXV
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[time-nuts] Restoration of a 5065A - Continued

[Ulf Kylenfall via time-nuts]

 

Yes I noticed some peculiar behavior when I operated the A7stand alone on my 
lab bench, and tested the 2nd harmonic detector at 137and 274 Hz. Then when I 
examined the schematic for thenewer version I could see that HP obviously 
discovered the same thing.
I think I will make a home-brew board first. Time to dig outmy old etching 
stuff...

Corby Dawson wrote:
Ulf,

You either should replace the -6010 old style A7 or if building one from
scratch build the late style.
The new style has a BP filter on the 2nd harmonic that makes the 2nd
harmonic reading a better indication.
On the old style as you adjust the CF (in open loop) you will see the 2nd
harmonic reading rise! This is bogus and caused by the 137 Hz signal
bleeding through. On the new style when you move off frequency the 2nd
harmonic reading drops as it should!

Cheers,

Corby
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[time-nuts] Restoration of 5065A - continued...

[Ulf Kylenfall via time-nuts]

 
When I mentioned redesign, it was the intention to copy the by HP updated 
designinto a new Cad project (I use Cadence PCB Editor for which I have a 
license)and then accomodate for more modern versions of the 
operationalamplifiers since I guess that there are not that many "A7" 
modulesaround as surplus. Even HP used DIP-versions in the updated design.
Today, I was offered a partially scrapped 5065A for parts.The XO is gone but 
the Rubidium tube is there, (most likely brokenTX heater). I have no idea of 
how old this unit is, but perhaps some modules in itare more modern than the 
ones in mine.
I would have loved to get my hands on a modern/late unit and do the 
Edmund-Opticsfilter installation (Super 5065A) as referenced here. Some 
yearsago there were one up for sale at a reasonable fixed price. I hesitatedand 
-  "kazing" - it was gone.
I have so far replaced the 709's with 741's and removed the 
frequencycompensation components (I did that already yesterday). 

BR
Ulf Kylenfall  SM6GXV
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[time-nuts] Resoration of 5065A - continued...

[Ulf Kylenfall via time-nuts]

 
Continuing my efforts to fix the 5065A...

There was something wrong in the A7 (AC Amplifier assembly).

DC balance of the input stage was completely off-scale
and one of the 1854-0023 transistors had an open junction.Luckily I had a small 
supply of them but I also discovered that
the OP-Amps were old "seven of nines" (709).

There are several different manuals floating around on the internet,
and the hard copy that I have shows two different versions
of A7. One with 709 and one using 741 that is also different
in terms of circuit design and layout.

I am considering redesigning A7 using modern CAD and also
purchasing boards from a professional vendor, but first I would like
to know if anyone has tried both versions and if there are any
improvements. The modern 741-version uses DIP-socketed
OP-Amps so that version could be tried with even better
types.
BR
Ulf Kylenfall   SM6GXV
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[time-nuts] HP 5065 Meter readings after restoration and adjustments: 2nd Harmonic Problems ? (II)

[Ulf Kylenfall via time-nuts]

2nd Harmonic level has gone down from 18 to 14 in a few hours.Needle is nervous 
in the way that it wiggles about one needle-widthin a random but slow pace.
All other readings are stable.
Rotating the knob back and forth restores the previous readings.
I am considering a fault in the 137 MHz circuitry.
/Ulf

    
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[time-nuts] HP 5065 Meter readings after restoration and adjustments: 2nd Harmonic Problems ?

[Ulf Kylenfall via time-nuts]

 Having repaired an old 5065 with help from documentson the KO4BB and this 
list, I took it to my workat Onsala Space Observatory where we have two 
H-Masers in order to fine tune it.
Initially, the meter readings were close to those listed insidethe protective 
lid, dated 1987 when the instrument was decomissioned.
Supply = 40Lamp Oven = 24Cell Oven = 28Osc Oven = 48Photo I = 305 MHz = 
38Control = 0 (After adjustments)Error = 02nd harmonic 18 (was 30 
initially)1MHz/100 kHz = 40
Because it is an early instrument, it did not featurethe thermoelectric device 
that is recommended forformatting the PhotoCell I used a hair dryer to format 
itfollowing the advice of Corby Dawson. The 2nd Harmonicvalue was initially at 
30, but now it has dropped to 18.
"ON"-time is now ~ 24 hours.
The meter is not stable and the needle is somewhatnervous. When tapping the 
instrument with a smallscrewdriver, this value jumps up and down.
The instrument is still locked, and after adjusting theSynthesizer & Magnetic 
field, comparing the 5MHzoutput to that of the H-Maser indicates a phase 
shiftchange of approx. 0.1 degree in 30 seconds. 
I did the alignment yesterday, and 12 hours later the phaseshift "velocity" has 
not changed. I also tooka phase noise plot using a Keysight PXA but I do 
notknow if the plot is a "true" one. There seems to bea pedestal within 10 Hz 
of the 5 MHz signal after whichthe PN drops significantly. No power line 
bumpsor other spurii is visible.
My intention is to leave the instrument on for severalweeks in order to see if 
it is stable. Right nowmy concern is wether the 2nd harmonic readingindicates a 
wear out of the photo cell.
When repairing the RFV Cavity, all components weretaken out and carefully 
examined. There wereno dimmed or darkened glass surfaces whatsoever.Apart from 
repairing the TX heater, the only other thingwas replacing the 1K something 
resistor in the TXassembly.
Comments invited.
Ulf KylenfallSM6GXV



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[time-nuts] HP 5065A repair...

[Ulf Kylenfall via time-nuts]

 After having salvaged an old 5065A that was
decomissioned in 1987 due to Rubidium cavity
heater short circuit, I have now, several
weeks later eventually managed to what I think
repair it. 
Using a GPS-Diciplined HP105A
as oscilloscope trigger, the 5MHz O/P is
absolutely still. "Continous Operation"is ON, and the values indicated on 
thepanel meter are almost matching thosewritten on the operating chart back in 
1987.

The next step is to take the 5065 to my work
where we have two H-masers. Then it will be possible
to see if it meets the old specification.

A BIG Thank You 
to Corby Dawson!for valuable help and also to people providing
the documents found on KO4BB site ("First Aid...")
Ulf KylenfallSM6GXV
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Re: [time-nuts] time-nuts Digest, Vol 156, Issue 35 (5065A Pwr Xfmr - Too high output voltage)

[Ulf Kylenfall via time-nuts]

Yepp. 
That was a brilliant idea...
...until I realized that I needed 115V for the XO quick-heaterand we use 230V 
in Europe...
So the SMPS splution will not work for me.
I will use an old (dual primary winding) linear supply which has the advantage 
of providinga regulated 24V that can be used for the heater windings of the 
rubidiumcavity.
Ulf - SM6GXV


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 Sent: Friday, July 28, 2017 6:00 PM
 Subject: time-nuts Digest, Vol 156, Issue 35
   
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Today's Topics:

  1. Re: 5065A - Looking for AC XFMR PAECO 9100-2742    specification
      (paul swed)


--

Message: 1
Date: Fri, 28 Jul 2017 11:21:51 -0400
From: paul swed 
To: Discussion of precise time and frequency measurement
    
Subject: Re: [time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742
    specification
Message-ID:
    
Content-Type: text/plain; charset="UTF-8"

Poul
I looked at your site and the power supply. That makes a lot of sense.
Though I have not lost my transformer as Ulf has at least I see an answer
that I can use. I would have come up with the same approach but you did the
thinking for me.
Thanks
Paul
WB8TSL

On Thu, Jul 27, 2017 at 3:58 PM, Poul-Henning Kamp 
wrote:

> 
> In message <675538475.428966.1501176257...@mail.yahoo.com>, Ulf Kylenfall
> via t
> ime-nuts writes:
>
> >Removing that board I discovered that the "24-32V" raw DC was some
> >40 Volts.
>
> That's a bit on the high side, but not excessively so.
>
> HP tended to let the linear regulators shave a big slice in
> precision instruments, probably to make sure that absolutely
> no ripple makes it through.
>
> If I were you, I would ditch the transformer entirely, and go with
> an external DC PSU and put a high-quality DC/DC converter in the
> HP5065A
>
> See:
>
>        http://phk.freebsd.dk/hacks/HP5065A/20150930_dcdc/index.html
>
>
>
> --
> Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
> p...@freebsd.org        | TCP/IP since RFC 956
> FreeBSD committer      | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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>


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[time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742 specification

[Ulf Kylenfall via time-nuts]

 Trying to repair an old 5065A.
After a lot of problems with the Rubidium cavity restoration, it was time to 
startthe unit.
Lucklily, I did not have the Rubidium temperature controller PCB mounted,but 
the Power supply regulator malfunctioned and blew the AC mains fuse (0.5A).
Removing that board I discovered that the "24-32V" raw DC was some 40 Volts.
Yes - The unit was correctly configured for 230VAC. Even withsome load, the DC 
was still ~40V
Unable to find out why, I had to remove the original transformer and replace 
itwith a 22V unit after which the rectified DC was back to some 32 Volts.
(In Europe, there are seldom primarys with two windings 115/230 which madethe 
search extra tedious).
The 5065 was originally wired with internal battery backup as well asa 
mechanical clock. These options was removed since the batterieswere deceased 
and the clock driver flip-flop unobtanium.
After PSU board repair, all supply voltages are normal, the Rubidiumcavity 
warms up and the crystal oscillator and syntesizer seems to work.
Have not gotten further, just want to know what the h**k was going onwith the 
transformer...
Ulf - SM6GXV




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[time-nuts] Power Connectors and D-Subs...

[Ulf Kylenfall via time-nuts]

 
Why not take a look at mixed D-Sub connectors?There are versions with Coax, and 
also (fits same shell holes) high current pins and sleevesthat share the house 
with standard pins and sleeves.
The rest of this infra structure like shells and locking mechanismsare readily 
available. Another BIG advantage is that there are a large numberof versions 
available for direct PCB soldering. Straight and right angle.
Hermetic/moisture proof and also filtered versions as well.
But: due to the slide on/in nature of these connectors, at my work, we never 
use themfor precision timing. The requirement for Geodetic VLBI calls for pico 
second resolutionand stability.
We use N, TNC or SMA.
BNC or any other non-threaded/bayonnet connector is strictly prohibited.
Ulf - SM6GXV
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[time-nuts] Poor man's oven

[Ulf Kylenfall via time-nuts]

  The Crystal heater clip wasa Murata "Posistor" soldered onto a clipand they 
were marketed by Murata.
I once purchased a small amount of theseand used them as "poor man's ovens".
Although not perfect by far, they did theirjob and kept my UHF gear stable.
Murata dropped that product many yearsago and I have not been able to findany 
similar product. The Posistors arelisted by eg. Digi-key but they do not stock 
them.
Ulf - SM6GXV

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[time-nuts] HP 1820-0313 4.2V Logic (Flip-flop)

[Ulf Kylenfall via time-nuts]

 
Starting to trouble-shoot some of the 5065A circuitryI saw that the 
(mechanical) clock drive flipflop IC1of the digital divider ass:y A16 is 
behaving very strange.
All of the voltage regulator circuitry in this ass:y is working,providing 4.2V 
and so on, but IC1 and the two transistorsQ11 and Q12 exhibits a strange 
behavior.
When IC1 is driven by a 1PPS squarewave of 0...4.2Vthe outputs of the 
transistors goes from either 0...4.2VOR 4.2...13V OR 0...13V in a random 
pattern.I can see this also at the bases of the transistors.The 13.3V is stable
That the 1820-0313 is unobtanium I can understand.Has anyone created an 
equvalent based on discretesor is there a suitable SMD "single" flip-flop like 
single gatesthat could be suitable?
(Just want to know if I should scrap the Option 01 and 03alltogether)
UlfSM6GXV
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[time-nuts] Regarding the 00105-60xx (Bringing a 5065A back to life)

[Ulf Kylenfall via time-nuts]

  What I wanted to know was the differences (specs) betweensome of the 00105 
oscillator modules in order tomount the best one in the 5065A which I am trying 
tobring back to life.
I have a bunch of 10811assy:s and thereare differences in drift, phase noise, 
etc. Thecoarse frequency adjustment hole does not havethe same coordinates as 
the 00105 so I will not fitany of these.
Fortunately I have an excellent printed copyof the 5065A manual with all 
schematics and so on.The manual is printed 1971.
(I found some newer manuals where HP appearentlyhad made some modernisation of 
modules, replacingregenerative dividers with TTL versions, changedOP-amps into 
modern versions and so on, but the one at Keysight.com is not readable.)
Otherwise, replacing obsolete components withmodern available ones would be 
another thing to do.
Digging into the junk bin I found HP original 5065 extender boardsso that I 
will be able to check the PCB's once the workstarts.
Ulf - SM6GXV
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[time-nuts] Specifications (Service manual?) for HP 00105-60xx oscillators?

[Ulf Kylenfall via time-nuts]

 
Gentlemen.
I have the excellent manual for the 10811-oscillatorswhich includes the specs 
for the different versions.
I have searched for a similar document for theolder 00105-60xx ocillators but 
there seems to benone.
Preparing for the 5065A restoration, I have a coupleof 00105-60xx oscillators 
and I would like to knowthe difference between them.
Ulf KylenfallSM6GXV 
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[time-nuts] A good GPS-Receiver with 1PPS output...

[Ulf Kylenfall via time-nuts]

 
Gentlemen.
I am sure this has been asked before...
I am looking to purchase a GPS receiver modulethat supplies a good/stable 1PPS 
outputwith as little (internally) generated jitter as possible.
PCB-style is OK. It is to be usedfor GPS-locking a HP 105B in aseparate box.
Miniaturization not necessary at all.
Can someone suggest a suitable product(eBay ?)
BR
Ulf KylenfallSM6GXV







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[time-nuts] HP5065A S/N 0048-00131 - Worth repairing (and how to do it)?

[Ulf Kylenfall via time-nuts]

 HP 5065A S/N 0048-00131 
Repairing the heater...
I was able to get my hand on a faulty 5065A
that was left for dead.
The date codes on the semiconductors says 1968
so this unit is 50 years old... This instrument
has some provenance as it was
used in the European end during the very first
trans-atlantic VLBI (Radio Astronomy) 
experiments between Sweden and the USA.
The unit has the known problem with one of the
rubidium unit (s/n 05065-6001)
heater wires shorted to GND.
This failure was the cause of the decomissioning.
I managed to salvage:The transmitter lamp (fires up within seconds when 
connecting it to a 20V DC source),The Rubidium glass cavity, The photo-cell at 
the receiving end.
Having downloaded the "First-aid" documents
from KO4BB, I read a quote from Corby Dowson
regarding this problem and what to do about it.
I have been able to separate the TX/Rb/Rx assembly from
the magnetic shields but after this, I hesitate
about how to proceed. (why did not HP put more energy
in trying to isolate the magnetic winding from the shield?
Any scratch on the enameled copper wire and a short
circuit will be the result here as well?)
As far as I can see, the magnetic
winding has to come off. The rest of the
polyurethane (?) structure has to be removed
after which that structure has to be rebuilt
using some other material (PTFE?).
One other reason why I hesitate is that this unit is
v e r y old. It uses regenerative dividers
instead of binary (etc) and a lot of other
obsolete components.
I could use some suggestions about what to do next.
One other question is of course if it is worth
putting a lot of energy trying to repair
a 5065 as old as this. Perhaps easier to go
look for a working modern 5065A on the open market?
Comments invited.
Ulf Kylenfall
SM6GXV
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