[time-nuts] Defective Z3801 and strange PS board

[Jim Lux]

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
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>