[time-nuts] Z3801 misbehaving

Artek Manuals Manuals at ArtekManuals.com
Tue Jan 26 10:33:21 EST 2016


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 <wpxs472 at gmail.com> 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
Manuals at ArtekManuals.com
www.ArtekManuals.com


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