HP8924-Family-Spectrum-Analyzers@groups.io

x28c256 memory #hp8920b

hello, can someone tell me if the x28c256 memory installed on hp8920b can be copied with the programmer to have a .bin or .hex file to store it in case of failure. and if so, what results did it give?

thanks

Re: DIY SRAM cards for Epson and regular PCMCIA styles

#346

After opening the other 40pin Epson 32k card that was HP branded, all I found was blobs of epoxy.? No joy.

I did order out some 512k ultra low-power chips to try in the Agilent card, but is on the back burner now.?

I did find a 1M 48GX card on e-bay for much less than normal.

It was branded GRID and IT DOES WORK. Although the cover was starting to come apart at the battery it
was easily glued with a toothpick and some contact cement.? I peeked under the cover and
blobs of epoxy there too.

There is a note on the 8920a schematic that one of the blocks of memory is loaded backwards.? Might be
significant if using a programmer to load these.

Re: Intermittent error #hp8920b

#345

Just a little more detailed description than was posted here before.

Hank
______________________________________

There's a problem with dbm levels only in spectrum analyzer mode.? The 8920B measures 4dbm high on both inputs, RF in/out and Antenna IN, but in power meter mode the equipment measures the levels perfectly.

I ran the RFDIAGS2 test and get the error "Receiver Assembly (Low)" for 100MHz 614.3MHz IF and 500MHz 114.3MHz IF. I cleaned all the semi-rigid cables and all the internal modules but that didn't make any difference.

I have the schematic but I don't have the in-depth knowledge to solve this problem

Re: Intermittent error #hp8920b

#344

Thanks Hank.

?

I'm sure there are members here with a lot of knowledge to help me. thank you for your support.

Regards

Re: Intermittent error #hp8920b

#343

Your English is fine.

Maybe the temperature dependence and the screenshot you provided will give someone some clues as to where the problem lies.

Hank

Re: Intermittent error #hp8920b

#342

Dear Peter,

I tried to clean all modules and all coax cables, but I wasn't successful, when HP8920B is on for 1 or 2 hours the failure is constant, but after 3 or 4 hours on, this failure becomes intermittent.

Any help will be appreciated, Sorry for my bad English.

Regards

hp8920B.JPG

Re: Intermittent error #hp8920b

#341

Hi Alemao,

After some time the rigid co-axial cables at the underside of the unit develop poor connections

due to corrosion. they are very small and delicate but with care can be disconnected and gently cleaned.

Once a good connection is established you may find the fault is rectified.

this is a simple fix and worth trying.

All the best.

Peter.

Intermittent error #hp8920b

#340

Hi I have got an intermittent error with my HP8920B. The error is "Receiver assembly (low)".
Could someone please provide some clarity on this issue.

Thanks in advance!

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#339

Thank you, Alexander, for your email. Pls note that as I wrote in my previous, in the next step I will try with a sync separator.

But I think that reporting this easy way to get a picture to the monitor, should prove a good first step for many that otherwise might drop their efforts; and for others, including me, is a QnD solution when needed.

73

Yiannis
SV1MNE

Στι? Π?μ, 12 Αυγ 2021 στι? 6:57 π.μ., ο/η Alexandre Souza <alexandre.tabajara@...> ?γραψε:

Show quoted text

08/08/2021 12:10, sv1mne wrote:
> Hi Alexander, it definitely works without a sync separator, via the Y
> Composite input (at least on my GBS8200)
> Look at the pictures I have posted in my SV1MNE folder in Photos
> section.

Ok, if you think that it is working missing a piece of the screen, feel
free to use that way.
--

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#338

08/08/2021 12:10, sv1mne wrote:
Hi Alexander, it definitely works without a sync separator, via the Y Composite input (at least on my GBS8200)
Look at the pictures I have posted in my SV1MNE folder in Photos section. Ok, if you think that it is working missing a piece of the screen, feel free to use that way.
-- 

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#337
Edited

Hi Alexander, it definitely works without a sync separator, via the Y Composite input (at least on my GBS8200)
The picture I get is exactly as yours in "A proposito, ninguem questionou "e se colocar o video composto na entrada da controladora do LCD? Claro que eu tentei, olha a meleca que fica =D"
Look at the pictures I have posted in my SV1MNE folder in Photos section. (/g/HP8924-Family-Spectrum-Analyzers/album?id=241724)

Best R

Yiannis

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#336

It does not work, you gotta use a sync separator and inject composite video on g (or r or b) input of analog video and composite sync on sync input.

Yiannis wrote:

Show quoted text

Hi Alexandre and friends,

The connection I made is as follows:

1. From HP8924c video out (BNC) to GBS8200 Y-video in (RCA) with BNC cable and BNC to RCA adapter
2. From GBS8200 VGA out to Samsung Monitor/TV VGA/PC input with standard VGA cable
3. The GBS8200 is set o YPbPr mode.

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#335

Hi Alexandre and friends,

The connection I made is as follows:

1. From HP8924c video out (BNC) to GBS8200 Y-video in (RCA) with BNC cable and BNC to RCA adapter
2. From GBS8200 VGA out to Samsung Monitor/TV VGA/PC input with standard VGA cable
3. The GBS8200 is set o YPbPr mode.

As it is shown in the photos I uploaded, it works almost well, for practical purposes, but the display is offset to the left, missing three text columns. (Maybe this will be corrected with the sync separator).

Thank you for the nice work and leading us to a solution!

Best R

Yiannis
SV1MNE

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#334

Sorry, I wasn't able to understand. You got the GBS8200 but you're connecting the tv directly to the SM? It wont work, you gotta build the sync separator and connect it on the GBS8200 as I wrote on my blog...

73 de PU2SEX Alexandre

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#333

Thank you Friend

Re: 2 photos uploaded #photo-notice

#332

You may be able to shrink it in your Monitor's setup H-Size and H-Center

2 photos uploaded #photo-notice

[email protected] Notification

#331

The following photos have been uploaded to the SV1MNE Photos album of the [email protected] group.

By: sv1mne <sv1mne@...>

Re: Conecting external monitor to HP8924c #video #gbs8220 #vga #hp8924c

#330
Edited

Hi again,

My GBS 8200 V4.0 has arrived and I managed to get a display on my Samsung TV monitor directly from the video RCA connector.

The image is crisp and steady,? Black and White, which is nice btw. The only problem is that it is shifted on tha lest and a portion abt 3 text colums, does not display.

Uploaded photos in SV1MNE folder.

Next I will try with a sync separator.

73

Yiannis

Re: Program to retrieve HP8920 calibration data...

#329

hello OLIVER_D can you tell me what options your instrument has where you have done the cal_dump? since you are much more experienced than me according to you or whoever reads it is possible to dump (copy) the X28C256-20 with the eeprom programmer that is installed on the machine? many thanks if there is an answer Alfonso?

Re: Loading RFTOOLS files into an 8920A

#328

Hi Robert,

Yes.  That is the program that I have been using to convert the DOS formatted files into LIF formatted files.

That doesn’t seem to be the problem, though as I get the same result whether the disk is DOS or LIF formatted.

I wonder if it has anything to do with the “new” file name?

Do you know if the order of the files matters?  

Any other thoughts?

Thank you for your help!

Brian

开云体育