In a message dated 26/09/2009 15:40:29 GMT Daylight Time, [email protected] writes:
Of course, another problem is that the Z3801A doesn't use 48V. It takes more voltage, from K8CU's site: The Z3801A is specified by HP (depending upon model) as either a nominal minus 54 or plus 27 volt device. The best bet is to keep the voltage at the nominal value specified by HP. This way any out of specification internal DC to DC converters are satisfied, and the units will perform normally. Reports from other users confirm this. ---------------------- Most Telecom supplies do seem to be around the -54 volt mark, the one I use for the Z3801A is a bit lower than this at -55.1 volts, but the Z3801A itself is marked 38 to 60 Vdc. Whilst the HP Specification, as per page 5-4 of the manual, is -54 Vdc nominal it does then go on to clarify this as being..... -60 Vdc +/- 0.5 Vdc to -37 Vdc +/_ 0.5 Vdc operating range, less than -46 Vdc +/_ 0.5Vdc starting. As expected from the above, PSU problems tend to be more noticeable at startup if higher voltages, ie closer to zero, are used but a regulated -48 volt supply should be fine. regards Nigel GM8PZR _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
