I agree that the extra converter is to provide isolation and input
voltage flexibility. Mine runs on 24V, and I assume that the first
converter is the only difference from the more common 48V units.
Also, each stage of conversion should provide additional power supply
rejection performance. It
At 18:54 10/07/2011, Ed wrote:
I agree that the extra converter is to provide isolation and input
voltage flexibility.
Thanks to all that answered my questions; very interesting thread.
Possibly only input voltage flexibility and EMC considerations, since
the isolation was already given by
On 7/10/11 12:56 PM, Marco IK1ODO wrote:
At 18:54 10/07/2011, Ed wrote:
I agree that the extra converter is to provide isolation and input
voltage flexibility.
Thanks to all that answered my questions; very interesting thread.
Possibly only input voltage flexibility and EMC considerations,
Hello group,
after many years (about 12, I think) of faithful continuous
operation, my Z3801 failed.
I opened it, and found that there was no supply to the main PCB. The
power supply board in the Z3801 (and Z3805, 58503A, possibly all the
series) is marked 58503-60003. It is a very strange
Marco like you I had lost one of the dc dc converters. As I recall the 48
5V. I simply replaced it with another I had and the 3801 has been working
for years. The board is a complicated board and I have not seen schematics
for it. Though it would be quite reasonable to develop them.
There is a
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
Actually that is a wide range switcher. But useless given we tend to drive
these with a reg 48 V supply.
Regards
Paul
On Sat, Jul 9, 2011 at 10:49 AM, Marco IK1ODO ik1...@spin-it.com wrote:
Hello Paul,
thanks for info. Another list member gave me two good links: KO4BB has the
schematic of PS
My educated guess is that they expected to sell these to telcos, who
traditionally run everything in a central office on -48v and running off of ac
was an afterthought.
On Jul 9, 2011, at 9:43, Marco IK1ODO ik1...@spin-it.com wrote:
Hello group,
after many years (about 12, I think) of
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
Hi
Guess 1:
Design it all with the first set of switchers, run it through all the fancy do
them one time tests. Get to the last test, fail. Project is now well behind
schedule.
What's the fast fix? Slap on a wider range / lower emission / better isolation
/ what ever switcher in front of
I have a Motorola based 5 MHz unit, that's a rack mount, that's the same,
using a 45-48 Vdc supply, and was told at the time it was due to the Telco
standard voltage. I use it with my Racal products, as their timebase is at
5 MHz. By the way, this unit was pulled from a cell tower.
Best,
Will
On 7/9/11 8:31 AM, Bob Camp wrote:
Hi
Guess 1:
Design it all with the first set of switchers, run it through all the fancy do
them one time tests. Get to the last test, fail. Project is now well behind
schedule.
What's the fast fix? Slap on a wider range / lower emission / better isolation
On 07/09/2011 05:26 PM, Jim Lux wrote:
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
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