there are two versions a 24V version and a 48V version ... If you look
at the back of the Z3801 there will be a "dot" on which voltage your
unit is powered for . ...The 48V version is the more common. Since your
unit is going through the full LED cycle on 27V supply I suspect that
you do have the correct voltage.
Since I know your are running Z38xx software I would revert back to the
SATSTAT to get things settled down. I have had command string errors
with Z38xx which I dont get with SATSTAT
Dave
NR1DX
ArtekManuals
On 1/26/2016 7:56 AM, paul swed wrote:
John
The 3801s are getting very old at this point. I know mine has started to
show a loss of lock occasionally on the oscillator. Intermittent problems
are very tough.
What jumps out to me is the 27 volts. That seems low as I recall. I run at
48 V. I understand there were several models made so what I mention may not
be correct.
The other thing is there is a small regulator on the power board.
I know on my unit one of the regulated outputs on the switcher failed and I
simply replaced it with another small block switcher. Though as you mention
your voltages appears fine.
Regards
Paul
WB8TSL
On Mon, Jan 25, 2016 at 8:54 PM, John Green <[email protected]> wrote:
After running continuously for about 3 years at work, I stored my Z3801 for
a little over a year. I recently took it out of storage and when I hooked
it up, all I get is a power on light. The front panel LEDs light in
sequence and the 6 inside blink red once and then the last one blinks
continuously as always. Thing is, it never locks on GPS. I even left it on
over night. When run on 27 volts, it starts out at about 1.1 amps, then
after about 10 minutes, goes up to 1.26 amps. Then, after about 30 more
minutes, it settles down to .88 amps and stays there. The OCXO gets warm. I
haven't checked for 10 MHz out, but I am pretty sure it is there. I hooked
it up to my netbook but I get no response from it at all. I am using one of
those USB to serial devices and it used to work. I am looking for a PC with
a real serial port to try. I know the antenna is good. It works with one of
those Symmetricom GPSDO cards. Having heard about the evils of tantalum
capacitors for years, I replaced them all except for those on the GPS
receiver board itself. All the test points that call out a voltage read
correctly. I'm thinking of trying a new GPS board next. I have had this
thing a long time and it has always just worked. Any ideas what the problem
is?
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Dave
[email protected]
www.ArtekManuals.com
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