Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: Looking to connect with other 4396B owners
I have opened the 41951A impedance test kit a while ago to see how it was constructed. But there is really nothing fancy inside. Some inductors, a few caps...
I uploaded the pictures if anyone is interested. Of course these pictures are useless to draw a schematic from it. If better pictures required, I will open the box again. Doing so the first time was quite a hassle because the screws where glued in and extremely hard to loosen. |
|
Re: Replacement battery for 8566A
开云体育The issue is the contacts as it is a drop in pack but I’ve rebuilt them by resoldering those to the weld tab if you’re quick nothing gets too hot at the battery!Adrian Sent from an I-thingy On 22 Mar 2019, at 06:28, Stephen Hanselman <kc4sw.io@...> wrote:
|
|
Re: Signal Generator Comparison Chart ?
Just a note on the Gigatronics 1026 generators, when working they are pretty good generators - 0.05 mto 26GHz. Harmonics and spurs are almost nonexistent in these units. Flatness is on the order of 1 or 2dB across the entire range on a good unit, all bands are detector leveled. I probably have an e-copy of the service manuals somewhere. There are at least 3 versions of the service manuals over the decades that they were made. There are also some variations that go to 40GHz, I think they were model 1040. Gigatronics really doesn’t want to support them anymore and has dumped much of the documentation.
The RF chain encompasses 3 to 5 YIG oscillators and mixers for up/down conversions to get all of the band coverage. There are 7 modular RF assemblies screwed down to the chassis and connected with non-rigid coax, but all are preformed for fit. There are also at least 7 multi-pole coax switches. The coax plumbing is a real challenge. The power supplies are compact and not real easy to repair as the main supply is directly in front of the fan mounted in heat sinks. There are secondary supplies on circuit cards. The electrolytic caps are problems for leakage with age. There are 14 smallish circuit cards across the back of the unit that are the YIG drive circuitry for each of the YIGs, 2 or 3 are the modulation circuitry. Depending on options you can have AM, FM, and Pulse modulation. Expect to see these as US military surplus. Replacement YIGs can be purchased from MicroTek for about $2-4K each. I have probably repaired 30 or more of these units. Repairs to the hybrid microcircuits can be done by someone that is knowledgeable in SMT repairs, or National Test Equipment has done some hybrid microcircuit repairs for me in these units. If you go after this unit and plan to service it yourself then plan to purchase 1 working unit and 1 or 2 parts units. About 60% of the repairs I did were power supply or YIG drive circuitry, the remainder involved the hybrid circuits and SMT repairs mostly pin diode switch replacement due to opens or leakage. I would estimate there are more than 60 SMT RF/uWave pin diode switches in the hybrid circuits. If you have to start replacing hybrids, YIGs, coax switches, and attenuators (Gigatronics, HP, or Wilton branded - all were used at different times and are all of similar construction 0-90dB, 10dB step and 0-12dB, 1dB step), then repairs will get expensive fast. Full alignment is only 2-3 hrs. I checked on eBay(USA), “working” units seem to be about $2-4KUSD each. Non working parts units are about $500USD. There are also service manuals available. If you need more info about the Gig 1026 or GT9000 contact me. Don Bitters |
|
Re: YTO Needed
开云体育I have a couple of HP and several avantek units. ?I’ll check the on in the morningRegards, ? Stephen Hanselman Datagate Systems, LLC (775) 882-5117?office (775) 720-6020?mobile a Service Disabled, Veteran Owned Small Business DISCLAIMER: This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.On Mar 21, 2019, at 20:33, rpoz28cam via Groups.Io <rpoz28cam@...> wrote:
|
|
Re: Replacement battery for 8566A
开云体育Batteries plus may be able to weld you up a nicad pack. ?I would not use lithium and remember if you just use alkaline cells to put a diode in series with the batteries to prevent the charging system from damaging the batteryRegards, ? Stephen Hanselman Datagate Systems, LLC (775) 882-5117?office (775) 720-6020?mobile a Service Disabled, Veteran Owned Small Business DISCLAIMER: This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.On Mar 21, 2019, at 23:19, Adrian <Adrian@...> wrote:
|
|
Re: Signal generators
On Thu, Mar 21, 2019 at 05:09 PM, Reginald Beardsley wrote:
You can get the same performance for 10% or less of the price. That's pretty cool in my book. That is awesome definitely.? Especially, even more exiting is if a decent board can be made in an even more cost effective module even without all the features like has been done with the older AD chips that can be bought really cost effectively on eBay.? Reminds me of a great presentation of an application of the ADF4355.? ? I'll have to look into what the ADF4371 upgrade modularized system looks like sometime... with mixing and harmonics filtering... seems like wow!? Way cool!? |
|
Re: Replacement battery for 8566A
It’s a standard HP calculator nicd pack as used in the HP45 type calculators. There are people selling rebuilt ones in the USA on Ebay. Not as easy in the UK!
toggle quoted message
Show quoted text
Adrian Sent from an I-thingy On 22 Mar 2019, at 05:12, Don Bitters via Groups.Io <donbitters@...> wrote: |
|
Re: Replacement battery for 8566A
The original battery pack was a 3 cell battery Ni-Cad @ 4.5v. Years ago I could purchase similar sized 1.5v Ni-Cad cells and rebuild the battery pack. At this point in time I would simply find a battery pack 5V and under, and wire it in to the to the same placement as the original. I have seen multiple 3 cell wireless phone battery packs that would fill the bill as a replacement. The original battery pack and holder is screwed down to the front sub-panel and attached to the RF motherboard via 2 pins. If you replace the jacks on the replacement with the ones from the the original case, then zip tie the new battery pack into the old position, and you are done. Do check the polarity.
Don Bitters |
|
New phase lock board for 8753ES - qualitative first test
Today I received a new A11 phase lock board for my misbehaving 8753ES (thank you Pete M!).
A lot of measurements will follow as I have lab time, but I thought I'd run a simple "plug it in and hold ears" test. Test 48 now passes.? The 1 V/GHz waveform test on the analog bus has the same shape as before, but the starting voltage is below 3.5 volts instead of 3.6 as in the original board. I still have some intermittent lock issues below 10 MHz but this is major progress. I have a lot to do, including Root Cause Analysis of the failure of the original phase lock board.? Perhaps the precision 6.2 volt reference zener has gone out of tolerance, it would only need to be a few percent off.? I will see. What this means is that when the troubleshooting guide says the waveform should be as they show, it means literally in this case.? A waveform starting at 3.6 instead of 3.5 volts may cause failure. Much more to follow! Peter |
|
Re: HP8753ES versus HP8753D
Steve
开云体育Thank you pianovt. I had seen the comparison on that web page at some point and lost track of it. Just what I was looking for!Steve, K8JQ On 3/21/2019 7:01 PM, pianovt via
Groups.Io wrote:
|
|
Signal generators
FWIW I bought an 8648C w/ opt 1E5 for under $1k delivered. Very nice clean instrument which should meet most or all of my needs.
I also received an email from AD today which might be relevant. They have a new part in volume production, the ADF4371. I'm sure there is a significant amount of programming required to turn this into a bench instrument. But the eval board set is under $1K and the specs are *very* impressive. It's clearly worth a close look if you want to go above 4 GHz. I have been stunned at what you can buy now in the form of an OEM eval board. If you require a broad range of capability, a commercial instrument is generally a better choice. But if you need to do a narrow range of tasks and are competent writing software You can get the same performance for 10% or less of the price. That's pretty cool in my book. Reg |
|
Re: Looking to connect with other 4396B owners
开云体育Hello, well, I am now semi-retired - maybe, if I find another opportunity when some surplus store closes, I will snipe it.
Until then, I can darkly remember that the manual for the 41951A
contains a very blurry shot. Maybe this can help you...in
principle, I am all game to help out.
Tam With best regards Tam Hanna --- Enjoy electronics? Join 13700 other followers by visiting the Crazy Electronics Lab at On 21. 3. 2019 23:34, markhaun2000
wrote:
2) nope. But I was told that it uses some kind of transformer, so the block diagram in the service manual is deceptive. I furthermore heard RUMORS of the one for the 4195A working on the 4953A if you slinked around with the cables. Sadly, this is all I know - so far, all managed to elude me.Yes, I believe the general shape of the circuit is known or can be deduced from available literature.? The best summary I have found is here: |
|
Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
The DS1230Y utilizes an encapsulated internal battery.? The battery is disconnected until external power is applied breaking the "freshness seal" and connecting the battery to the RAM.? So with a new device you are dealing with battery shelf life until it is powered up.? And I assume that nearly all if not all device programmers will supply power to break the seal and allow you to program it and remove it from the socket without losing the newly programmed contents.
Good reading: Some of the above data reflect older dates. I see that Digi-Key still handles large quantities of the DS1230Y: As well as does Mouser: And others out there. Greg |
|
Re: Looking to connect with other 4396B owners
2) nope. But I was told that it uses some kind of transformer, so the block diagram in the service manual is deceptive. I furthermore heard RUMORS of the one for the 4195A working on the 4953A if you slinked around with the cables. Sadly, this is all I know - so far, all managed to elude me.Yes, I believe the general shape of the circuit is known or can be deduced from available literature.? The best summary I have found is here: ? ?(about the 4291A RF impedance analyzer---similar vintage from the same design group in Japan) But it would be nice to see the innards.? The difficult aspects will be those which cannot be represented in a schematic diagram. |
jafinch78 .
to navigate to use esc to dismiss