On 7/9/11 7:49 AM, Marco IK1ODO wrote:
Hello Paul,
thanks for info. Another list member gave me two good links: KO4BB has
the schematic of PS board (!) in
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05)_GPS_Timing/Z3801/Z3801A_Power_Supply
and there are some more info in
http://www.realhamradio.com/GPS_Frequency_Standard.htm
All this confirms my analysis, and since it works well without the first
converter I will leave it alone, as you say :-) - if you look at the
first converter schematic, it is really quite complex; and if you power
the Z3801 from 48V it has nothing to do.
In the telecom world, the 48V is -48V, with the positive being ground.
Maybe that's why?
The other thing is that this gives them a way to make multiple versions
with different supply voltages by only changing one converter. As
others have pointed out, too, it might let you use a wide input range
converter as the first step.
There's also a matter of using "off the shelf" converters. I've built
more than one piece of lab gear this kind of strategy.. you have a box
full of 28V to whatever you need (+5, +/-15V, etc.) so then you need a
AC to 28V
Thanks to all for the good info, and thanks to Didier for hosting all
the good things.
Vy 73 - Marco IK1ODO / AI4YF
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