[time-nuts] Z3801 misbehaving

paul swed paulswedb at gmail.com
Tue Jan 26 10:55:19 EST 2016


Good comment on leaving it on for a long time if the almanac has been lost.
You see nothing accept the green pwr led and I have seen 48 hours to lock.
I added a batter 2 X AA and that keeps the almanac and enhances startup.
But nothing like a modern 30 sec or less receiver.
WB8TSL

On Tue, Jan 26, 2016 at 5:30 AM, Artek Manuals <Manuals at artekmanuals.com>
wrote:

> John
> I am no expert but I have been playing ( A lot) with my Z3801 during the
> last month, after having it in storage for 15 years !
>
> What software program are you running, under what operating system?
> Can you see the satellites being tracked in the receiver status window in
> SATSTAT? on the computer?
>
> I have had very poor success using the Belkin USB to serial adapters And
> picked up a laptop running a real RS-232 port and Windows XP.
>
> Without being able to see commands and the Receiver Status on the computer
> it can be a bit hard to troubleshoot blind this beast.
>
> In my case I still get glitchy things going on with Z38xx program by the
> German fellow and I had to revert back to SATSTAT to do set up. Then I
> revert back to Z38xx for its graphics displays of the data once the
> receiver settles in
>
> Dave
>
>
>
>
>
>
>  On 1/25/2016 8:54 PM, John Green 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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