8924C power in on 60watt port question.
Hi group, first forgive my ignorances but on my hp8924c I have been using it to align my transceivers, in transmit mode on the 60 watt port I can look at power, frequency etc, but I want to also look at the spectrum and output on the build in O scope. Can I safely do this via the 60 watt port without damaging anything? If so is there anything I need to do when I go to SA or Oscope mode??
Thanks,
Bill
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Hank-? Others have complained that tin plate goes flaky.?
I found where someone was trying to use nonvolatile serial ram with a bunch of support/glue/translation chips in an effort to do away with the battery problem?
with voting machines.? Scary hairy and stuck out in the way, but it was a proof of a concept.? They had a high rate of dead batteries and lost votes.
There are 4 more Address lines not used on this board - we need to use compatible ram.? It is CMOS.? I would rather upgrade a card that fits my instrument.
There are errors on my notes, pads for SOP vs TSOP others.? Doing some more ringing out and will share.?
Still wondering if ANYONE has verified the simpler 48gx cards actually work??????
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This is a goal near and dear to my heart.? I think as a group we ought to be able to crack this and maybe get PCBs made for both the Epson and the standard SRAM formats.? Last week I ordered some double row female sockets just like the regular SRAM cards use.? The prices for these cards are just too much seeing as how CMOS ram is dirt cheap now.
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Was wondering what the heck the little package was.? A relief that it's nice but really optional.
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Don't you think having the edge pads tinned as done by the Chinese PCB houses would be good enough for non-commercial purposes?? I think so.
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By the way, my idea is that to relieve the strain of designing the parts into a very thin package, to instead make a PCB that would hang out a ways and have the parts located there (at least at first).? A 3D printed case would make it reasonably mechanically sound.??
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Just bear in mind that just getting something running is okay as a first step even if it's a little ugly.
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Hank
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On Friday, June 18, 2021, 02:38:09 PM EDT, jb? wrote:
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?I was going to build one of these but the problem of making gold plate on the edge conn. put it off.
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The edge connector is the same as a PCI card. I did some trials years ago using a PCI riser cable intended for low profile rack mount PD case.
Robert G8RPI.
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I was trying to ring out the lines from the instrument to the card, and compare my 32k card with the 48 project.
This one has a little more to it but not much. Memory is one HY628100b, but the board is pinned out to
accept different options and different jumpers select what to do with lines not used in the 32k.?
The smaller chip is DS1312 for battery backup management. The hp48 projects just use a dual diode to
isolate the battery from external battery from the instrument.? I was looking into this last year and my notes are crap.
This one maybe a newer version and has no shutter.? I have another with shutter that is HP branded rather than
Agilent.? I was going to build one of these but the problem of making gold plate on the edge conn. put it off.
It came apart OK by pulling the battery and 20min in 90% Isopropyl and a single edged razor blade.
Has anyone actually tried a 48sx/gx card in a 8920A?
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I understand the Photos now, you have just lifted the "skin"? of the card and the frame is in place.
You will need to identify the IC's used.
Robert G8RPI
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I don't understand the PCB photos, they appear to be masked or cut-off, but yes a lot of memory cards can be expanded by adding additional chips. Link changes may be required for correct addressing.
I've never tried one in a 892x, but as far as I can tell from published information the RAM extension cards used in the 48SX and 48GX have the same connector and pinout as the "Epson" card for the 892x (and some other HP instruments) and should be compatible
Robert G8RPI.
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I see now.? The HP-48 notes are just the backdrop for the opened Epson.
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On Thursday, June 17, 2021, 10:53:44 PM EDT, Hank Riley via groups.io <n1ltv@...> wrote:
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Aren't those pictures of the RAM card that goes in the HP-48 calculator?
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Aren't those pictures of the RAM card that goes in the HP-48 calculator?
On Thursday, June 17, 2021, 09:17:36 PM EDT, jb via groups.io <ssnova64@...> wrote:
Looks like my 32k could be upgraded?
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Looks like my 32k could be upgraded?
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The following files have been uploaded to
the Files area of the [email protected] group.
By: jb <ssnova64@...>
Description:
cal dump from 8920A v14.14 seems to be in good working order
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HP8920A upload program files?
OK, I can upload and download ASCII IBASIC files via terminal program to/from PC via rs232,
but what about .PRC, .LIB, .PGM files and "whatever" those screen setup files are?
Can I just upload PGM as text and the rest are developed?
The screen setup files capture as gibberish with some text, but when captured as hex from LIF or DOS initialized cards, they are different.
Any pointers?
Thanks, Jim
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Re: HP8924C Saved Settings Transfer
This morning, got out the old computer with the PCMCIA slot. Would not start up. Had to reset the BIOS, eventually found that it thought it had a SATA when it has an ATA HD. In the middle of this using reboot discs, the CD Drive would not open, Fixed that. Now the computer seems to work. Another day wasted due to ancient computer problems.. Not to mention my HP printer will not connect to my homegroup, even though it lists the router on its screen. (once in a while it connects momentarily) Go Think, That's another story.
Wally
On Sunday, June 13, 2021, 01:31:43 PM EDT, lobos305 via groups.io <lobos305@...> wrote:
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Re: HP8924C Saved Settings Transfer
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Re: HP8924C Saved Settings Transfer
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Yes, that's covered in your 8924C User's Guide which is?08924-90038.pdf in our files section (search on "8924" to find it).
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It's the section called "Saving and Recalling Instrument Setups" beginning at page 61. The idea is to save to a memory card (SRAM) and then use that card in the other monitor to clone the setup to it.??
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Once the setup is resident in the second monitor the setup can be saved to "internal memory" so the memory card doesn't have to stay plugged in.
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On Saturday, June 12, 2021, 01:52:04 PM EDT, lobos305 wrote:
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I wonder if there is a way to move saved settings from one monitor to another???
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HP8924C Saved Settings Transfer
I wonder if there is a way to move saved settings from one monitor to another?? It would save a lot of time instead of hand-jamming everything.
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Re: E8285A - how to backup calibration data?
Did you try Jeff's cal data program yet?? I also have an 8285 but don't have the old laptop quite ready to run where the heavy HP is.
The laptop was in the RF lab, but it became inoperable on account of needing a second WIN XP activation.? No idea why that happened.
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Re: HP8924C Cal File Checksum Incorrect
Thank's for all.
73,
Molina
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E8285A - how to backup calibration data?
Morning! Subject says all...how to backup it?
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73 de pu2sex Alexandre
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Re: HP8924C Cal File Checksum Incorrect
Hi,
regarding the "Cal file checksum incorrect. File reset to default values." error message, the assembly level repair manual states:
"This message occurs at powerup when downloading of calibration data is unsuccessful. It indicates that the calibration data is corrupt, and although the Test Set will function, measurements will be inaccurate. Calibration data is downloaded from a memory card when certain assemblies are replaced, or it is generated when the Periodic Calibration program is run. This message will not occur again at powerup unless another unsuccessful downloading occurs."
I would assume that unless you have backups of the calibration data from all relevant assemblies, it will be difficult to restore the unit to full working order (i.e. make it operate within its accuracy specifications). I am not sure whether sending the unit to a calibration lab is a possible fix and whether it covers all lost calibration data. From my understanding, there are certain coefficients in the calibration data that are generated by the manufacturer of the respective module (e.g. spectrum analyzer).
Regards,
Oliver
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Alexandre Souza