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| Replacement for the PM9610 Prescaler for Philips PM6654 High precision Counter |
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| SaabFAN:
I've found some time to work on this again. The boards I have work pretty well with the workarounds I've detailed in the last post when I use pure sine wave generators. The ADALM Pluto unfortunately is completely useless as a signal source as there's always some kind of modulation on the signal, so I have no means to test the device with sine waves in the frequency range 400 to 900 MHz until I have my Signal Generator working. The latest Revision has only one RF Amplifier and I'm revising the Standby-Circuit in a way that the board doesn't need the negative supply anymore, so no more damaged OpAmps when I supply only the positive voltage during testing :) The "B"-Signal and "TEST GO" disable / enable the Output of the Prescaler-Board. "B" adds a Bias-Voltage to the detected RF-Voltage or subtracts it from the RF-Voltage - I'm not entirely sure anymore ;) In any case, it turns off the output of the Prescaler when the Prescaler is not needed (in the PM6654C this is the case when Channel C-Mode is not selected). "TEST GO" on the other hand pulls the other input of the comparator in the standby-circuit to a value that ensures the Prescaler-Output to be on under all circumstances for testing purposes. |
| SaabFAN:
I just checked the Schematic of the PM6654C Mainboard again. The B-Signal is left floating on that board, so it's not actually needed. It either is used when installed in a different instrument, or just there for testing purposes. The TEST GO-Pin connects to the "DATA OPTIONS"-Connector "BU108" on Pin 24, but is not used by any Option that is listed in the Service Manual. So it was probably only there for testing during manufacturing. |
| gmac34:
Hi, nice project, I have a PM6652 that would need a prescaler. Are you still selling pcbs? Otherwise, would you share the fabrication files? Thanks |
| maximvs:
I also need a prescaler for my 6654c. Any way I can get the PCBs or the gerber files ? Thanks you, -George |
| ddosegov:
Just wondering are there older versions pcb files available for download or someone have spare board for version with MC12095 prescaler? |
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