I recently got in an HP-58503B GPSDO from a local equipment liquidation auction. I had to pay too much, but wanted one to verify Lady Heather's support for the HP GPSDO's. It powered up at the equipment auction preview. but not when I brought it home. After replacing the power supply with a Meanwell RQ-15C - $20-$40 instead of $375 for the PowerOne that was in it and replacing the GPS receiver (it had a lot of difficulty tracking more than 2 sats) I have it working properly now.
The unit has 83,000 hours of run time. I think it was last powered up in 2013. After a week the holdover uncertainty is around 8 us and the DAC is at +43%.
The display is a bit dim and blotchy. Does anybody have a replacement display that would look better? Contact me off-list if you have one or know of a source.
I recently got in an HP-58503B GPSDO from a local equipment liquidation auction. I had to pay too much, but wanted one to verify Lady Heather's support for the HP GPSDO's. It powered up at the equipment auction preview. but not when I brought it home. After replacing the power supply with a Meanwell RQ-15C - $20-$40 instead of $375 for the PowerOne that was in it and replacing the GPS receiver (it had a lot of difficulty tracking more than 2 sats) I have it working properly now.
The unit has 83,000 hours of run time. I think it was last powered up in 2013. After a week the holdover uncertainty is around 8 us and the DAC is at +43%.
The display is a bit dim and blotchy. Does anybody have a replacement display that would look better? Contact me off-list if you have one or know of a source.
