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Very nice work indeed! Thanks for making such careful measurements. That data is pure gold. -- Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford,

Where Julio bought his programmer, where it was built, which one it was, or what OS he was using to drive it has no bearing whatsoever on the size of the EPROMs or the correctness or lack thereof of

Dear Yves, Thanks. For the measurement I tuned the 8567B to a frequency far from the 450 MHz measurement frequency- above 1,200 MHz. The measurement was made using a low noise (around 1dB Noise

None of which has anything at all to do with the contents of the EPROMs, their sizes, or the PCB modification for the high-order address bit! The manufacturer and device ID that can be read out

I hope this isn't too much info, but see below for VNA derived plots of the parallel Rp and Cp of the HP 8405A diode when reverse biased by 3V. It's also compared to the 1N6263 diode across

All fixed. Cost more in postage than the parts required! The source chain consists (after the mixer) of 2xERA3s 1xERA4, a small tranny and a big bolt down jobby, thankfully the latter 2 were fine and

https://www.nearc.net/resources_caps.htm Those are considered "bumblebee's". Generally, speaking, they were bad if they made a noise when you threw them in the trash. [email protected]>

There's no need to change those 51 k resistors. HP had it all figured out, for proper and safe input overload handling and ESD. You'll probably notice they are fairly large (maybe 1 or 2W) in power

Are you suggesting that HP changed from 27256 to 27512, just putting two copies of the code in the low and high halves? I could believe that, if 27512s were easier to come by, either in the

Both U57 and U58 have valid data up to address CD18 (52504) . So what ever is in the ROM almost uses the 80% of the 65535byes available.? Definitely this will not fit on a 32K chip .? There must be

Generally, changing from one EPROM size to another doesn't change the code, but rather just changes which EPROM it is put in. I would take the images from the 32Kb set, and convert them to binary

If I'm not mistaken, brown,black,yellow,white(silver?),yellow -> 100,000pF, not sure of the tolerance (white, silver?), 400V. Barry - N4BUQ

I looked at the HEX files from version? 4.21 and all but the U57 and U58 have 2 copies of the contents repeated . Address 0000 to 7FFF is unique and copied to the rest of the image from address 8000

Did you tested the sweeper alone ? Connect a power sensor to output and measure power levels over frequency range. You can control the sweeper form 8510C , set zero span and different frequencies. If

Replacing both C111 and C112 with your purchased parts won’t be a problem. Jeremy N6WFO [email protected]> wrote:

I set this up today. See the diagram below. This is a classic external levelling system as used professionally for metrology/calibration. The ALC feedback creates a voltage source (close to zero ohms

I found the main power supply issue, a blown capacitor in the HV section, one side to ground. Unplugging the tubes was not enough to exclude the HV section. From the schematic I notice that the blown

I just got an HP 3585a that didn't work. I tracked down the problem to a shorted tantalum cap on the A26 board that was pulling down the 15v supply. The unit seems to work well except that it keeps

This one is indeed more correct, given it corresponds to the '341' series tag. Never thought I would gather so much knowledge on edge connectors. I love this hp gear!

Hi Patricio, I did run the self test which shows me no code.I still see the caution IF not found and that VNA freq sweep is slow and inaccurate. I managed to access this module inside the SAF