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
Hello all time-Nuts,
I have a older Bulovaaccuquartz the hands are not moving any ideas on the
problem.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
The information contained in this e-mail transmission is privileged and/or
confidential intended solely for the
Bravo, Rob. I thought I was the lone voice crying in the wilderness in
support of watches.
My beater is an Omega Seamaster that goes everywhere and does everything
all the time. My others tend to sit in their rocker boxes and seldom get
worn.
This was a very interesting thread. I have worn a
In the late 60s I had an inexpensive wristwatch with a
cheap leather or plastic wristband. I did not want the
enhanced conductivity if a metal band when working
with vacuum tube circuits.
Where I worked the only clock visible had been rigged
to go backwards. But it did keep good time, which is
I dont wear a watch since 25 years or more. Plenty of clocks around and
now will cell phone and other personal devices all have clocks.
Analog generation *know* the time from the position of the clock hands.
By the position of the hands you know how many minutes left to an
I've not been to Beijing but the National Palace Museum in Taipei has some
remarkable mechanical clocks, including water clocks. My Significant Other
is Taiwanese and whenever I get smug there is nothing like a visit to the
NPM to remind me that the Chinese were crafting breathtaking objets d'art
On Sun, Jul 10, 2011 at 08:48:07AM +0530, Raj wrote:
Analog generation *know* the time from the position of the
clock hands. By the position of the hands you know how many minutes left
to an appointment etc. IF you ask them the time then it will take a
moment to convert it to words!
Okay guys, I saw a very strange timepiece when I was out shopping. If it
wasn't $17k I'd consider it:
http://www.youtube.com/watch?v=4PwJCzetTCI
Interesting concept, looks good. On a side note, earlier today a friend
gave me an Accutron 214 from 1965 that previously belonged to his father.
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