Re: HP 5344A Source Synchronizer - FM output fuse spec?
Thanks Jens,
So the one in there already is the correct rating. Need to work out why it has blown now.
You help Much appreciated
Tony
ArtekMedia has a good quality scan available.
From the service manual: Chapter 6:
A6F1 FUSE .062A 250V NTD 1.25x.25 UL 2110-0011
?
So it should be rated with 62mA.
?
Best regards,
Jens
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Re: HP 5344A Source Synchronizer - FM output fuse spec?
Sounds like it is the right one at 62mA = 1/16A approx.. by banging a nail into a piece of wood...
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On 3 Jan 2022, at 16:45, jemotrain via < jemotrain@...> wrote: ArtekMedia has a good quality scan available.
From the service manual: Chapter 6:
A6F1 FUSE .062A 250V NTD 1.25x.25 UL 2110-0011
?
So it should be rated with 62mA.
?
Best regards,
Jens
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Re: HP 5344A Source Synchronizer - FM output fuse spec?
ArtekMedia has a good quality scan available.
From the service manual: Chapter 6:
A6F1 FUSE .062A 250V NTD 1.25x.25 UL 2110-0011
?
So it should be rated with 62mA.
?
Best regards,
Jens
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Re: HP 5344A Source Synchronizer - FM output fuse spec?
Hi Nigel,
It is stamped - it says "312 1/16A 250V". The problem is I don't know if the right one was used or and whether 1/16A is the correct value.
Tony
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Re: HP 8601A 100 kHz to 110 MHz Generator / Sweeper
I would assume, by looking at a digital copy of the 8601A service manual that two panel BNC to SMB cables mount to the plugs on the rear panel, then connect to VTO (J13) and LO input (J12), Fig 8-37 board A14, schematic 13 on page 8-33.
Seems straightforward enough, but I don't believe I have the cable-pair on hand. And I wouldn't want to do the modification like this one:
https://www.ebay.com/itm/255230575556?epid=1721885693&hash=item3b6ced83c4:g:IyYAAOSw7GhemVxK
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Hello fellow DRAKE, Hallicrafters & Agilent-HP? groups.io ? contributors.
I? recently noteda similar theme in all 3 groups : "affordable test equipment" .
I'm sharing a few resources I've found quite helpful.
?
Recently I did some self-gifting and ordered a few more Amazon finds & will review upon receipt .
* Oscilloscope : $90
USB Oscilloscope OSC482M for Both Android Phone/Tablet & Windows PC.
2 Channels, 50M S/s, 20MHz (Bandwidth), 8~13 bit Vertical Resolution
Sold by: Loto Instruments
* Function generator : $30
1HZ-500KHZ DDS Functional Signal Generator, Seesii DDS Function ,
Low Frequency Signal Generator Sine/Triangle/Square/Sawtooth .
Sold by: HUAIFANGPING
* LNA : $11
HiLetgo 0.1-2000MHz RF WideBand Amplifier 30dB High Gain Low Noise LNA Amplifier
?
* $90 Tiny SA ( Spectrum analyzer)
Have it & works splendid .
?
?
* $14 Freq Counter
gazechimp PLJ-6LED-H Signal Frequency Counter Meter Test Module 1~1000MHz LED 3 Color - Red
Have it & works splendid .
?
* $30 Simple RF Signal Generator Frequency 35MHz-4400MHz Signal Source,
Have it & works splendid , though close-in sideband noise is just middling? .
?
?
%% More guidance on affordable test equipment, from trusted colleagues
in Automotive Industry & IEEE EMC Society .
Although ElectroMagnetic Compatibility may not be the problem you are trying to solve,,
the trouble-shooting & analysis techniques to find the basic - root mechanisms are quite applicable .
?
## Arnie Nielson "Low-Cost Instruments and Procedures to Troubleshoot EMC Issues"
NanoVNA *, SDRplay*, (RF) signal amplifier - NWDZ-RF-P, TinySA*, DIY TEM cell,
DIY bulk current injection probe*, ESD- piezoelectric barbecue lighter*
[[ * = items in Jerry JDM LABS / WA9FIY shop ]]
?
## Ken Wyatt, WA6TTY
Some duplication with Arnie Nielson list & techniques. There are 3 books in the series .
?
Happy New Year & wishing you all rapid repairs !
73 & Best Regards,
Jerry Meyerhoff / WA9FIY [ since 1963]
JDM LABS LLC
1/3/2022
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Re: HP 5344A Source Synchronizer - FM output fuse spec?
Usually the fuse value is stamped into the end cap. by banging a nail into a piece of wood...
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On 3 Jan 2022, at 15:56, Tony Cox < tonycox01@...> wrote: Hi,
Happy New Year to you.
I have an HP 5344S source synchronizer that has stopped working with an Err5 message. One of the trouble shooting hints is to check the FM OUT fuse on the Main Loop board (A6 - picture attached) and this has indeed blown. Not sure why - yet. However the online service manual is very poor scan quality and I can't see the spec for the fuse to be able to replace it.
Does anybody happen to know what the rating of the FM OUT fuse on A6 ought to be?
thanks a lot for your help
Tony
<2022-01-03_15-33-17_996.jpeg>
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HP 5344A Source Synchronizer - FM output fuse spec?
Hi,
Happy New Year to you.
I have an HP 5344S source synchronizer that has stopped working with an Err5 message. One of the trouble shooting hints is to check the FM OUT fuse on the Main Loop board (A6 - picture attached) and this has indeed blown. Not sure why - yet. However the online service manual is very poor scan quality and I can't see the spec for the fuse to be able to replace it.
Does anybody happen to know what the rating of the FM OUT fuse on A6 ought to be?
thanks a lot for your help
Tony
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Re: HP11758B Digital Radio Test Set
Yes, the devices are sensitive and not limited to the power sensors, it was drilled into me with spectrum analyzers too.? Knowing not just the peak power going in but the full spectrum power.? Generally, not an issue with single sources but when dealing with CATV feeds, that can cook a detector pretty easily.? ? ?But that is how we learn, sometimes, the hard way.
Didn't know the power sensors are not fixable.? Is there a reason?
David
VE6RKT
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Hi
Did you have any success with that eeprom hacking ? Im faceing same issue now. I have 54720A unit with lost mainframe calibration. It's crazy difficult to get this calibration plugin. I also have 54712A plugin, i will try to get programmer in next couple of days and do some comparation between those plugins binaries. Please let me know if you have any hints/ideas.?
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Re: YTO from 8595E in 8561E
Hello there are you able to choose frequencies above 2.9Ghz otherwise it may have forgotten that it is a HP8561E and thinks it is a 8560E. Other problems might be the Switch that alter the input signal to the low and high band mixer section. I think that happens
internally in the YIG tuned Filter. There should be a switch signal. Chack if the voltages changes on the pins for switch.
If you get no error like ERR334 or ERR301 the YTO loops should be ok.
best regards Peter OZ1LPR
Hello!
I was place 5086-7903 YIG into my 8561E instead of bad 5086-7906 and made YTO adjustment procedures from service manual.
There is no errors after reboot, but I can see signals till 2.89GHz only.
Can anoyone tell me please what is wrong?
Best regards,
Roman.
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Just wanted to point out that the HP3851A is pretty cool after all these years..
I am testing a battery protector for LiFePO4. It measures individual cell voltages from a stack of four cells and cuts out if any of the cells fall under or goes over a preset value. The 44702 + 44711 lets me measure all cell voltages and the voltage over the shunt over time when testing charging and discharging. Data is sent over GPIB to Excel.
If anyone has one of these, then I have some collected program snippets here:?http://www.dalton.ax/hp3852A/
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Re: 3325A Function Gen, where is the RMP test jumper?
Nope, apologies, it's a Rev C board - I was mistakenly looking at the attenuator board silkscreen.
Tony
Jared,
Attached is a picture of my Rev B A14 board.
Regards
Tony
Alrighty, I dug things out and opened it all up. Here is what I have.
Two 3325A with the following serial prefixes:
2512Axxxxx
2512Axxxxx
I also have a third spare A14 board but it is the same revision with no jumpers too.
All are Rev C A14 boards with no jumpers I can see around U34, unfortunately I haven't come across a different version of the A14 board yet.
My manual is 03325-90002, I wonder if there is either an earlier than the afore mentioned 90001 manual or a later one than my 90002 (assuming the numbering is in chronological order etc) that omits the RMP/jumper instruction?
Here are pictures of the three A14 boards I have:
It seems there must be a few revisions of this board with varying amounts of jumpers?
If anyone else can take photos of their A14 boards that are different to my pictures above and also the revision number and serial prefix, it might help narrow down these variants and the adjustment instructions.
Thanks!
Jared
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Re: 3325A Function Gen, where is the RMP test jumper?
Jared,
Attached is a picture of my Rev B A14 board.
Regards
Tony
Alrighty, I dug things out and opened it all up. Here is what I have.
Two 3325A with the following serial prefixes:
2512Axxxxx
2512Axxxxx
I also have a third spare A14 board but it is the same revision with no jumpers too.
All are Rev C A14 boards with no jumpers I can see around U34, unfortunately I haven't come across a different version of the A14 board yet.
My manual is 03325-90002, I wonder if there is either an earlier than the afore mentioned 90001 manual or a later one than my 90002 (assuming the numbering is in chronological order etc) that omits the RMP/jumper instruction?
Here are pictures of the three A14 boards I have:
It seems there must be a few revisions of this board with varying amounts of jumpers?
If anyone else can take photos of their A14 boards that are different to my pictures above and also the revision number and serial prefix, it might help narrow down these variants and the adjustment instructions.
Thanks!
Jared
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Re: 3325A Function Gen, where is the RMP test jumper?
Alrighty, I dug things out and opened it all up. Here is what I have.
Two 3325A with the following serial prefixes:
2512Axxxxx
2512Axxxxx
I also have a third spare A14 board but it is the same revision with no jumpers too.
All are Rev C A14 boards with no jumpers I can see around U34, unfortunately I haven't come across a different version of the A14 board yet.
My manual is 03325-90002, I wonder if there is either an earlier than the afore mentioned 90001 manual or a later one than my 90002 (assuming the numbering is in chronological order etc) that omits the RMP/jumper instruction?
Here are pictures of the three A14 boards I have:
It seems there must be a few revisions of this board with varying amounts of jumpers?
If anyone else can take photos of their A14 boards that are different to my pictures above and also the revision number and serial prefix, it might help narrow down these variants and the adjustment instructions.
Thanks!
Jared
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Re: 8753D Unwrapped Phase
I'm measuring a two port coupling assembly, with two female N's
on it. When
measuring the length I'm seeing about a 2 degree difference
between s11 and
s21. This seems like a large error to me.
Is there a better way to do this?
Hi.
Late to the party on this one.
I guess that difference depends on just what the "DUT" is.? S11
being reflection, so will be a function of the input impedance of
it.? While S21 is of course transmission, so as well as the above
having some influence, all the other internal through path stuff
comes into play.
When I'm tuning rebuilt broadband power amplifier modules (80MHz
- 1GHz) at work, where up to 32 of them all have to huff-n-puff
together in phase, to sum up to 1kW out.?? I've found it easier
now to use the group delay measurement display, and only the
actual phase for the last final check.
Learnt that some time ago, after one torrid experience where the
"Phase" at 1GHz was fine, but there was still a dip lower in the
overall frequency response that pushed the overall amp flatness
response just out of spec.
Eventually, we found one module in a driver was "different",
swapped it with a spare and all was good, and kept the customer
happy.
After talking at length with the US designer (back then, I could
call & talk direct to whoever I wanted, whenever I needed to)
he suggested checking the group delay if we had an analyser that
could do that.? We found that both instruments we had at the time
could do so, after exploring the measurement display format menu
some more.
Since then, it has been so much quicker and easier to do that,
especially with an instrument that doesn't do an "Unwrapped Phase"
display, plus the group delay is largely a horizontal(ish) line
end to end with those modules unless something is bad.?? Just have
to be careful to use "The Good" RF Test cables!? And not move
things too much when changing modules.
Oh yes, the cause of the original problem.? During a previous
repair (it was suspected.)? The wrong RF devices (for that
generation of module) had been installed.? OK for power/gain vs
frequency, but the matching on the input and/or output must be
different.? Replacing them with the correct type, and all was good
again.? Sadly, they had the same house part number, but were from
a different manufacturer, so an easy point of confusion.
Happy New Year to All.
Dave G8KBV.
--
Created on and sent from a Unix like PC running and using free and open source software:
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Re: 3325A Function Gen, where is the RMP test jumper?
I happen to be at the lake this weekend, where my 3325A and a paper manual reside. I don't know if my 3325A matches the manual (90001), but the manual shows on A14, there is a jumper or connector of some sort P31/J31 adjacent U34 - just below it on the board diagram fig 5-2, p 5-7/5-8. From the picture, I'm guessing it's a four-pin header, with the rightmost pin the test point "RMP TP 20," and the left three pins are a connector or shorting plug location.
The text alludes to making some measurements, and possibly leaving the jumper (or shorting plug) in the alternate position, if it works better, so i think it may show schematically as something bypassing or selecting a component out of more than one, rather than explicitly as a test mode. This may cause some confusion between the schematic labels, the adjustment procedure, and the actual function.
Ed
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Re: HP11758B Digital Radio Test Set
On Sun, Jan 2, 2022 at 09:07 AM, David Buhler wrote:
It is a shame that set pieces are separated and sold/ distributed.?
I have a few power meters all without the sensors, prices are ridiculous on many sell sites for "parts" only sensors.??
Hi All: Okay... the first part I'd blame what I call 'speculators' ... many of whom are on this list... or lurk it. For the second part... I wouldn't blame hams... well okay... I would blame hams... okay, some hams. It used to be a popular past-time for them to buy, for instance... an 8481D ( 10 uW tops, for any reasonable time)...for their cheaply acquired HP power meter... and then hook it up naked to their 100W transceiver. (There's guys posting... admitting to it.) Of course, sellers got tired of being held accountable for the actions of people who didn't know a pico-watt from a p ... destroying one sensor, only to ask for another... to destroy that too... or to demand money back because it was dead. So now, its 'parts only" ... or "for repair only." To which if one has any sense... one has to ask oneself.. parts?...parts for what? ... and... "for repair" ... one can't repair them. I wrote one Ebay seller to ask why he's selling these things "for repair" ... as he knows full well people can't. He said, Yes... he knows that... but, people buy them.
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Re: 3325A Function Gen, where is the RMP test jumper?
On Sun, Jan 2, 2022 at 07:32 AM, Jared Cabot wrote:
This one is a trimmer capacitor (C110) labelled RMP on the PCB
Ok. What's going on between U34 and U35 around R101? There is TP RMP ... looks like AMP? ... but, there is no TP AMP on A14?? ... just AMP OUT, in a different location.
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Re: HP Vacuum Fluorescent Display (VFD) Troubleshooting Help Needed: FIXED!
Problem solved! It makes perfect sense in retrospect, but I certainly didn't expect that the problem would be what it turned out to be.
Cut to the chase: It turns out that the replacement VFD also had a defective segment E pin! I looked very carefully after I removed it for testing, and I saw that there was a horizontal crack in the glass on the rear of the VFD across pins 1 through about 4 or 5. Pin 3 is the segment E pin, so it was just an unusual coincidence that the new one had failed in exactly the same way as the old one.
Segment E was definitely okay when I tested it before installation. I figure that the heat and/or mechanical stress of soldering it onto the display PCB must have made the the trace go open circuit, since Segment E was definitely not okay when I removed the VFD for testing.
The good news is that I had one more VFD display module that I installed and everything is working as it should.
Thanks, Adrian, for the advice!
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Christopher Tucker
Jerry Meyerhoff, JDM LABS
Anders
Jared Cabot