Hi Ok, I'd agree that there is a slight advantage to running 24 volts instead of 48 volts. I don't think I'd toss out a 48 volt supply setup, but if you're buying a new supply 24 looks like the better choice.
Bob On Sep 10, 2013, at 5:48 AM, [email protected] wrote: > I've monitored the power input against voltage for a couple of the uncased > versions of these units, both fitted with Datel TPB-5/5-12/1-Q48 power > converters and both well "warmed up", and it does increase somewhat with > increasing input voltage. > > On both units the input power to the DC to DC converter is approximately > 500 to 600 mW higher at 48 Volts than it is at 24 Volts, just for reference > that was with an ambient temperature of around 23 to 24 degrees C, and the > change does seem to be reasonably linear with respect to voltage. > As would be expected there's very little change in the output voltages so > this does represent extra dissipation within the converter itself. > > Using identical Motorola patch antennas one unit consumes approx 6.30W at > 24V and 6.85W at 48V with the other consistently 200mW lower across the > range. > Switching over to a couple of Symmetricom timing antennas, for example, > increased the input power in each case by approx 200mW. > > This does suggest there is actually some benefit to be gained by running > them at the lower voltage, but if this sort of difference really becomes all > that significant then perhaps it might also suggest a need for heading > back to the drawing board:-) > > 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. _______________________________________________ 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.
