[time-nuts] NTBW50AA Power Consumption
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue Sep 10 05:48:25 EDT 2013
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
More information about the time-nuts
mailing list