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Since the Ft Wayne Indiana Hamfest is coming up, Nov 16.... I have two units that I am taking offers on. Both have been tested on my bench and I have not found any problems at all. The 8935 has a beat up case but the front panel is in excellent shape. It has a front panel cover. The 8922 has only a 25 Watt input and does have the spectrum analyzer. All connectors on both units are in good shape. If you would like to pick up one of these units at Ft Wayne, Make an offer. I am in Indianapolis. Wally KC9INK

The following files and folders have been uploaded to the Files area of the [email protected] group. /8924C Memory card specs/Panasonic-BN-08MHSR-datasheet.pdf By: Jim <teotwaki@...> Description: Used in 8924C: Panasonic SRAM card specifications, pinout, etc.

Just for your information, apparently this fellow in the US has a FREE hard copy of the assembly level repair manual: https://www.eevblog.com/forum/buysellwanted/fsfree-(us)-hp-small-test-equipment-manual-binders/

I have a 8924C CRT module available for a nominal amount plus shipping. It has light burns but this doesn't really affect the operation. A few years ago, I changed it out for a new module but when in operation I didn't notice a lot of difference. I could probably could have left it alone. Drop me a note if you can use it. KE6CD

My 8395 works fine with the internal reference and I did ti alignment with an external source. However it does not lock with a 10 MHz external signal - shows "unlock" but once in a while it will Lock. If I put in a 10.000.022 MHz signal it will lock to that...but of course all the signals and freq counts are off also... I have the Temp Comp Xtl. 1813-1106 Any Suggestions??

I have one of those small UHF duplexers, and I think I need to tune it up. I took the ARES group's portable UHF repeater out yesterday and most of the time the repeater would receive my signal and transmit a carrier and courtesy tone at distance. But I would not hear my audio out until I was only a few blocks away. Where can I find the best documentation for how to set up the HP8924C tracking gen and see/adjust the nulls on the duplexer TX & RX sides? Thanks folks. ** Mark Weisenfeld K7TUM *

Caution: I just found this listing by accident. I know nothing about the seller or their reputation. Just passing on the info because right now the price is good if all functions are working and there is good calibration. I'm sure the price will rise sharply, but might still be good, esp. for local pickup or for a buyer near Florida. US $155.50 (as of 4:15 PM EDT Wednesday; 4 bids) Ends Thursday, 07:16 AM Eastern Daylight Time Pickup: Free local pickup from Clearwater, Florida, United States 33763 USPS Ground Shipping to US; depends on distance; mininum charge looks to be about $76 (Florida destination) _______________________________________________________________ WORKING Hewlitt Packard HP 8924C Test Set | eBay WORKING Hewlitt Packard HP 8924C Test Set | eBay The FER test quantifies the receiver's ability to correctly demodulate a signal in the presence of high interfer...

I get the duplex overvoltage message with the alarm sound which drives me nuts. I am not even using the duplex out! I mostly use RF I/O for my application. I tried measurement reset, but it continues with the alarm and message with no relief . Is there a way to shut off the alarm? I suppose this problem is telling me the power supply needs attention or something. The test set seems to work otherwise. Any help or insights would be greatly appreciated. thanks, Jim

I read as many old threads as I could before this. Waded through tons of web pages and some of that is summarized here. I've installed a 20dB 100 watt attenuator in my 8924C and need to load the matching cal files. Now, down the rabbit hole... looking for a solution for loading 39 kilobits of calibration data into the 8924C. The files are available here on the forum. For loading in cal data, the 8924C can look at the following locations: external HPIB disk drive, Internal ROM, Internal RAM, external front panel plug in SRAM (or ROM) card. External disk drives are scarce. Unsure how to interface such an old disk drive to a modern PC or how to load the cal files into a HPIB disk drive (or to load into a PCMCIA card). There are some web projects out there to emulate the HPIB disk drives. That's a bigger and deeper rabbit hole. Memory cards background info - not the same as the slim, 40 pin card as used in the portable instruments such as 85xx series spectrum analyzers or the 892x portable service monitors.. The correct cards for the 8924C are sometimes called "Epson memory cards". Based on a 68 pin 16 bit or 32 bit CardBus interface for PCMCIA cards. Loading data into them can be difficult from current generation computers. Amtronix no longer sells the cards that were part of their 60w and 100w upgrade kits with the attenuator assembly and new front panel sticker. I think a CardBus type 1 is 16 bit only and is the slimmer 3mm card. It might be what the HP 16 kB and 64 kB cards use. Cardbus type 2 is the 5mm card and can use 16 or 32 bit addressing. A few HP SRAM cards can be found on Ebay for big prices. I don't know if a combination of a "small" 32 Gb Compact Flash card and a CF card to PCMCIA bus adapter might work. Or maybe somebody out there has cards to sell? Thanks! Jim

Hi, I've built a GBS8200 converter with the well known LM1881 circuit. There is a clever design available for a 3D printed (FDM) enclosure: https://www.thingiverse.com/thing:4666227 (provides BNC slots, originally seems to be intended for RGBS via BNC or SCART to BNC inputs). Unfortunately, I have some woes with the converter. It reports 'no signal' in RGBS (or the other H/Vsync RGB mode), but I can see at the BNC composite video input the signal is present. I followed Ralph's wiring as detailed in /g/HP8924-Family-Spectrum-Analyzers/topic/82180602 Pending some proper diagnostics with the oscilloscope, my protoboard with the LM1881 has decoupling capacitors (100nF) at VCC and P2 and P6 as described by Ralph, and doesn't seem like there is anything obviously wrong with it. I quote Ralph's wiring notes verbatim: On the LM1881 connect pin 1 to the # 4 (gray wire) pin of the 8 pin RGBS input connector. Pin 2 to a .1 UF capacitor and then to the Green input of the 8 pin RGBS connector A wire from that junction goes to the input from the 8924C. Pin 4 to ground. Pin 6 has a .1 UF and 680 K resistor in parallel to ground. Pin 8 goes to 5 volts. Pins 3,5,7 are not used. I crimped connectors to make a harness so I can unplug the LM1881 board if desired. Green for RGBS is crimped together with the pin 2 trace of the LM1881 (composite video input, per https://www.ti.com/lit/ds/symlink/lm1881.pdf) LM1881 might also be replaceable by the more modern LMH1980 which can operate at 3.3V. This is quite convenient since the GBS8200 has regulated 3.3V at the 0-ohm jumper/resistor labeled R1, and it's sufficiently filtered through decoupling caps and at least one smoothing electrolytic cap. Does anyone have close up pictures of their LM1881 board? Is there anything I am missing? Could my 8200 be defective? I performed the modification with the 50k resistors at the RGB traces with the ASIC/FPGA under microscope and I know there are no bridges or solder wicks anywhere. Cheers

Good morning from Pinellas County, Fl. Just was wondering where would be the best place to sell my HP8924C (working condition). Power supply caps are good to go and the unit is fully functioning. Thank you in advance for any suggestions. -73 KQ4KIO Tally Tech and Troubleshooting

8924C PSU Took the PS out of the chassis and it looks like the 47uf cap was already replaced in my PSU unit, the green light is on, but when the power button is pressed, the supply makes a clicking noise and the unit doesnt power up. I dont have much switching PSU supply experience though im thinking a mosfet or something along those lines? Any help troubleshooting this would be much appreciated! David