I have an HP-5216A that I got at the local flea market. One tube is bad
and one driver.
I found the drivers (they're special HP chips), but now I see it has
about 10mA leakage current to ground. I've removed everything on the
primary side and it seems to be the transformer. There's a slight
Hello and thank you all for chiming in on my topic; all excellent
suggestions. I have been “out” since I submitted that, so I just now was
able to sit down and read through the last days digests. This is probably
the 10th HP5328A that I have had to fix the PSU on, so it shouldn’t be
such uncharted
Yes, exchanging data over a link will always harm its timing
accuracy/precision performance, irrespective of whether you steer clocks
(our case) or you exchange values or both. In fact, as I said to Jeremy in
another thread I tend to see clock steering (i.e. PLL) as a limit case of
interchanging
Javier Serrano wrote:
Yes, exchanging data over a link will always harm its timing
accuracy/precision performance, irrespective of whether you steer clocks
(our case) or you exchange values or both. In fact, as I said to Jeremy in
another thread I tend to see clock steering (i.e. PLL) as a limit
Jim, I found a good reference for LOFAR clock and sync:
http://www.astron.nl/sites/astron.nl/files/cms/PDF/LOFAR_Rep_057_clock_sync.pdf
After a quick read, I think they would have been a perfect candidate to use
WR, pity it's a bit late. Their system uses quite a lot of cables to achieve
(worse
What are you looking for Win 98 CD? Bert Kehren
In a message dated 9/10/2009 10:07:13 P.M. Eastern Daylight Time, pe
t...@standingwave.org writes:
I have a 54845A oscilloscope in which the internal hard disk appears
to be crapping out. This is a Win98 based unit, which is no longer
Hi Douglas,
I have no experience with this beast but to draw this sort of current
it points to a possible bypass cap short. If there are any dipped
tants in there, there is a high possibility that one or more of them
have gone short. If you have a good 4-wire ohm meter and a kelvin
probe, just
John Miles jmi...@pop.net wrote:
That's an interesting answer. Can you explain what you mean by
faster digital noise analysis capabilities?
The 3048A is relatively cumbersome to use, compared to a modern
phase-noise test set with high dynamic range ADCs. Conceptually, a
2009/9/11 Dan Rae dan...@verizon.net:
Even the 1992 duff button problem was solved by some kind soul who was
selling bags of 100 replacements on eBay recently for a very good price,
enough for three 1992s.
Blast! I missed out on that, any pointers to who was selling them?
Cheers,
Steve
--
Well, it will look like everything is shorted to ground if some major
power line on the PCB has a component that has gone really full sort.
You will only find this out either by un-soldering it (eventually) or
you use a high end ohmmeter that can measure really low ohms in 4-wire
mode with a
What I do to trace shorts on power busses is to apply some current from a
few volt power supply with a limiting series resistor, then probe along
the bus w/ a DMM or analog millivoltmeter. The smaller the measured
voltage, the closer you are getting to the short. It's like a 4 terminal
Mike Monett wrote:
John Miles jmi...@pop.net wrote:
That's an interesting answer. Can you explain what you mean by
faster digital noise analysis capabilities?
The 3048A is relatively cumbersome to use, compared to a modern
phase-noise test set with high dynamic range
Blast! I missed out on that, any pointers to who was selling them?
Cheers,
Steve
--
Steve Rooke - ZL3TUV G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
_
ebay doesn't make this easy with their 90 day purge
$25 +2.07 shipping May 12,2009
Dolores
Actually, you can see this as a Shannon information channel, analog or
digital.
What sort of bandwidth do I need to run a PLL over a long link?
I assume it takes enough to cover all the sources of error:
drift in the master
drift in the local oscillator
drift in the communication link
Not sure I understand all your questions. Concerning PLL bandwidth, assuming
you want to minimize jitter you'd set the bandwidth so as to minimize the
area below the phase noise vs. frequency plot. At high frequencies the phase
noise is that of the VCO in the PLL, while at low frequencies the
Thanks Stanley. I have searched for this seller id on eBay and can't
seem to find it but I've sent an email direct to the address you gave.
Cheers,
Steve
2009/9/12 Stanley Reynolds stanley_reyno...@yahoo.com:
Blast! I missed out on that, any pointers to who was selling them?
Cheers,
Steve
--
Hal Murray wrote:
Actually, you can see this as a Shannon information channel, analog or
digital.
What sort of bandwidth do I need to run a PLL over a long link?
I assume it takes enough to cover all the sources of error:
drift in the master
drift in the local oscillator
drift
Greetings to all timekeepers,
I have been reading the list for some time now and have greatly benefited
from the threads.
I have been fortunate to get one of the latest TAPR Thunderbolts (thankyou
tvb and TAPR). I also have built the TAPR distribution kit and it seems to
be a great item also.
I have not tried setting parameters in Lady Heather, but the Trimble
Thunderbolt Monitor program has a field for this. Its under SETUP then
TIMING OUTPUTs. The first variable is PPS Offset. In my case its 128
ns, its entered as -1.280e-07.
Brian KD4FM
Gordon Batey wrote:
Greetings to all
That is a very interesting answer. No wonder Stein pushes ease of
use so much for the 5120/5125. But they are $40k to $50k in Canada,
so obviously it's time for a new approach.
1) Where would you find ADCs with enough speed and resolution to
capture the noise signal from
In Lady Heather you set the cable delay with the /C[=#] command line option.
If no number is given (in nanoseconds) it assumes 50 feet of 0.66 velocity
factor coax.
_
Hotmail® is up to 70% faster. Now good news travels really
John Miles jmi...@pop.net wrote:
[...]
Thanks for your help, John.
Mike
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and follow the instructions there.
And vacuum tube equipment using indirectly-heated cathodes:
http://www.cpii.com/docs/related/23/Basic%20Tube%20Design.pdf
Operating techniques that are proper for filamentary tubes are not
necessarily
correct for tubes with indirectly heated cathode emitters. In
particular, the opera-
tion of
With tube gear, one fairly good way to reform the caps is either pull the
tubes (label where they came from) or disconnect the filament supply, and
then apply B+. You do need to check the schematic to make sure you don't
overvoltage caps that would see an increased voltage w/o plate current.
Also,
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