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Re: HP 3586 counter reading high
Hi Burt, It has the 004 time base however I have all of the gear synced to gps.?? Using the 3586 as a sig gen - tuned frequency on front display matches the output sig on the back panel. When inputting a frequency to the unit's front panel, the units fx readout is around 20 hz high. I have several of 3586s around the shop - that I have not worked on as yet.? The third one I opened up I pulled out the A22 board and it worked fine.?? Now to play around with trouble shooting the A22 board!? Check out my QRZ page! 73, Bill Riches, WA2DVU Cape May, NJ 73, ?
On Monday, November 11, 2024 at 07:47:55 PM EST, Burt K6OQK <biwa@...> wrote:
There are? two crystals that provide the injection, or carrier, for the upper and lower sideband product detectors, and as I recall, the 1800 Hz tone is a function of the product detector/s, . They are not used for any of the conversions.? The conversion oscillators are derived from the time base, which is a separate crystal oscillator.? Do you have the "Precision Oscillator" in your unit? I was going to suggest that you try using an external reference input to your 3586B to see if that resolves your problem.? It's possible that the internal reference may be off frequency. I don't have my 3586 book in front of me, so I don't off hand recall which board the standard internal reference is located. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. K6OQK -- Burt I. Weiner Associates Broadcast Technical Services Glendale, CA 91201 U.S.A. K6OQK |
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Re: HP 3586 counter reading high
There are two crystals that provide the injection, or carrier, for the upper and lower sideband product detectors, and as I recall, the 1800 Hz tone is a function of the product detector/s, . They are not used for any of the conversions. The conversion oscillators are derived from the time base, which is a separate crystal oscillator. Do you have the "Precision Oscillator" in your unit?
I was going to suggest that you try using an external reference input to your 3586B to see if that resolves your problem. It's possible that the internal reference may be off frequency. I don't have my 3586 book in front of me, so I don't off hand recall which board the standard internal reference is located. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. biwa@... K6OQK -- Burt I. Weiner Associates Broadcast Technical Services Glendale, CA 91201 U.S.A. K6OQK |
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Re: A Caution- leaking and fuming batteries
¿ªÔÆÌåÓýOh, and a sad tear for the damaged Watkins Johnson Receiver. Very good equipment. ? I used a few WJ-8999s and worked on one to repair it, too. Now, that is a very packed receiver. Both boxes are really packed with little room to spare. ? ? Ross ? From: [email protected] <[email protected]> On Behalf Of si_emi_01 via groups.io
Sent: Monday, November 11, 2024 3:46 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] A Caution- leaking and fuming batteries ? That happened in my McIntosh MAC4200 Stereo Receiver I purchased off of ebay. When I checked it out, the 3 AA size NiCd Battery Pack had failed. It ate the paint under the Battery Holder plus the Paint and Primer down to the Bare Metal. It had also crept for at least 1¡± beyond the foot print of the Battery pack. And yes, the leaking wicked down the lead wires onto a circuit card causing connector damage, it ate a couple of traces and left crud on the board. Lots of FOD and work to clean it all up and fix it. ? I replaced the whole NiCd Battery Pack with a 4 Farad 5.5V Super Capacitor. It was mounted to a G10 Prototype board. I pre-charged the Capacitor before connection. I also replaced the charging Resistor with a higher value and wattage for when it had power disconnected for long periods or a power outage for days (which I tested ¨C our power is very stable, maybe a power loss for a couple of hours per year). ? There was already a reverse current Diode in the circuit so, I didn¡¯t need to add one. The Memory-Hold Voltage Range was 3.0V minimum ¨C an important data point because a Capacitor discharge curve is different than a NiCd, but similar enough to allow the change. I also made sure the +5V Power source was healthy (Bridge Rectifier, Regulator, well heatsinked and new 105C Bulk Capacitors) to avoid any future concerns. ? Not original, but has worked well now for almost 5 years, it is designed to be reliable and safe. I know it won¡¯t happen again. ? Here is a picture of the modification before I cleaned everything up. ? ? ? ? ? All of the above items need to be investigated to make sure that what you are doing is in the best interest of any equipment modification and safety. Some people, as it has been stated before, replace rechargeable battery packs with other types of batteries (I have seen NiMH packs or Alkaline packs blindly replacing NiCd Packs before), again, you need to understand what you are doing. ? ? Relocating the pack, packaging it, isolating the lead wires and doing the other provisions mentioned in the original post and other response posted are really good ideas. ? ? Ross ? ? From: [email protected] <[email protected]> On Behalf Of Roy Thistle via groups.io ? On Mon, Nov 11, 2024 at 04:59 AM, greenboxmaven wrote:
Ya... I've seen that leakage... and destruction... when people have balked at replacing the battery with the speced battery. The speced battery is usually expensive... often seemingly unreasonably so... especially compared to an 'equivalent.' But, the 'equivalent' battery... often... has not gone through product testing... and subsequent validation... especially with regard to the purported product specifications. And some manufactures... well... IMO... they just lie. ? To bad about the WJ... nice rcvr. ? |
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Re: A Caution- leaking and fuming batteries
¿ªÔÆÌåÓýThat happened in my McIntosh MAC4200 Stereo Receiver I purchased off of ebay. When I checked it out, the 3 AA size NiCd Battery Pack had failed. It ate the paint under the Battery Holder plus the Paint and Primer down to the Bare Metal. It had also crept for at least 1¡± beyond the foot print of the Battery pack. And yes, the leaking wicked down the lead wires onto a circuit card causing connector damage, it ate a couple of traces and left crud on the board. Lots of FOD and work to clean it all up and fix it. ? I replaced the whole NiCd Battery Pack with a 4 Farad 5.5V Super Capacitor. It was mounted to a G10 Prototype board. I pre-charged the Capacitor before connection. I also replaced the charging Resistor with a higher value and wattage for when it had power disconnected for long periods or a power outage for days (which I tested ¨C our power is very stable, maybe a power loss for a couple of hours per year). ? There was already a reverse current Diode in the circuit so, I didn¡¯t need to add one. The Memory-Hold Voltage Range was 3.0V minimum ¨C an important data point because a Capacitor discharge curve is different than a NiCd, but similar enough to allow the change. I also made sure the +5V Power source was healthy (Bridge Rectifier, Regulator, well heatsinked and new 105C Bulk Capacitors) to avoid any future concerns. ? Not original, but has worked well now for almost 5 years, it is designed to be reliable and safe. I know it won¡¯t happen again. ? Here is a picture of the modification before I cleaned everything up. ? ? ? ? ? All of the above items need to be investigated to make sure that what you are doing is in the best interest of any equipment modification and safety. Some people, as it has been stated before, replace rechargeable battery packs with other types of batteries (I have seen NiMH packs or Alkaline packs blindly replacing NiCd Packs before), again, you need to understand what you are doing. ? ? Relocating the pack, packaging it, isolating the lead wires and doing the other provisions mentioned in the original post and other response posted are really good ideas. ? ? Ross ? ? From: [email protected] <[email protected]> On Behalf Of Roy Thistle via groups.io
Sent: Monday, November 11, 2024 12:34 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] A Caution- leaking and fuming batteries ? On Mon, Nov 11, 2024 at 04:59 AM, greenboxmaven wrote:
Ya... I've seen that leakage... and destruction... when people have balked at replacing the battery with the speced battery. The speced battery is usually expensive... often seemingly unreasonably so... especially compared to an 'equivalent.' But, the 'equivalent' battery... often... has not gone through product testing... and subsequent validation... especially with regard to the purported product specifications. And some manufactures... well... IMO... they just lie. ? To bad about the WJ... nice rcvr. ? |
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Re: Fitting rack ears to ageing HP equipment
Worst case, acetone will soften/loosen the adhesive, but be careful not to spill it on sensitive areas of the instrument and don¡¯t drink it!? A little acetone will return stickiness to old trim strips, if you have a need to put one back, or fresh double-side foam tape will also work.? Jeremy? On Mon, Nov 11, 2024 at 12:33?PM factory via <bobradios11=[email protected]> wrote:
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Re: Fitting rack ears to ageing HP equipment
I've always used an old hairdryer to soften the adhesive, an old flat blade dining knife of the type that was commonly made in Sheffield or Manchester can be used to pry, these days they sell the blade without a handle under the name 'spudger'
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Alternately if you can access the other side, use a small screwdriver to push the strip from the back, while heating, there are some holes in the cast frame, the same ones that the handles attach too.
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David |
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HP (Data Ray) CRT monitor from a HP SONOS 2000 available (free)
Note: This is a cross-post for any of you in the HP80 series groups.io group. I'm afflicted with an interest in the HP85 computer also.
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Hello fellow HP/Agilent junkies!
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A while back, I stumbled upon a late '90s vintage HP/Philips SONOS 2000 cardiac ultrasound machine. It was on Facebook Marketplace for $100, and had been sitting outside in a field. Our kids had a sports meet a few minutes from their location, so I offered to buy it. The seller loaded it into my van with a skid steer, and didn't damage it in the slightest. When I returned home that evening, I cleaned the leaves and rainwater out of the keyboard assembly, and poked & prodded around inside to assess the damage. I was a bit surprised that it survived the outdoors amazingly well. Seeing that it was inside my garage, I did what most of us would do - I plugged it in and powered it up. At this point, you won't be surprised to know that it worked almost perfectly. Only one of a great many circuit boards had failed - and that one had already been identified as bad. With the understanding that I'm not a cardiologist, or in any way a medical practitioner, it worked great, aside from a startup error message. Maybe that board was just 'extra parts' ?.
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My kids and their friends had some fun blasting our hearts, forearms, hands, etc. with ultrasonic energy to see what we look like inside. The fun went on for a while, but it is a large machine with no real market value aside from shipping it to 3rd world countries, which is also not a strength of mine. I reluctantly tore it apart for the components I wanted. What were they, you ask? Well, these machines include two yellow dot matrix gas plasma displays with resistive touchscreen overlays. That's the main thing. The other was a Sony magneto-optical disk drive. There's also a very nice 'medical VCR' inside, but this one has head damage. Lastly, the cart it is built upon is perfectly sized for my 5-axis micro CNC project.
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The gas plasma displays were part of the keyboard subsystem. The operator would view and set many options and parameters by touching the displays. The rest of the subsystem includes a custom full keyboard, about 20 linear pots for gain equalization, many rotary encoders for other tuning. The entire subsystem communicated to the main ultrasound-y section via RS-232. Pretty cool to see that! I didn't really have the time to snoop and decode the RS-232. It would have made a fun kids museum display - the gas plasma never burns in or out, and the keyboard assembly has about 1E6 things to interact with. Alas, an opportunity has been lost.
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If you're still with me, the actual cardiogram (?) was displayed on a 12 inch CRT. The monitor assembly is from Data Ray, and takes in RGB + a composite sync signal. I'm not well versed in analog video signals, and unfortunately, I didn't put a 'scope on the signals before decimating the machine, so I don't know the sync frequency, scan lines, etc. The tube manufacturer is unknown, as I cannot see the CRT label well enough to know. I can't see any evidence of burn-in. The picture looks pretty good. I'm plenty old to have used only CRTs for a long while, but honestly, it's hard to recall what good was for a CRT given modern technologies like OLED.
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If this is interesting to you, I'm offering it for free to anyone. I'm in Raleigh, NC, USA. I can package it up, but it would be large and heavy because a broken CRT tube is of no use to anyone. Hopefully one of you desperately needs a DATA RAY DR5312 display assembly. I'd rather not have it kicking around in my workshop, especially if it can be put to use.
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Feel free to reach out with any questions. Please be patient with me for answers, as I only catch up on this group from time to time.
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Kind regards,
Nick
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James55
Bill Riches
Burt K6OQK
Jeremy Nichols
factory