[time-nuts] Fun with the Z3815

Azelio Boriani azelio.boriani at screen.it
Sat Aug 11 08:16:14 EDT 2012


Try to preset the receiver too:
    :SYSTEM:PRESET
But first you can read the system log to try to identify when the failure
started:
    :DIAGNOSTIC:LOG:READ:ALL?
Doing a SYSTEM:PRESET will clear the log, of course.

Very strange the inductor on the antenna cable: my Z3815A has a capacitor
also because there is a different power for the antenna and I suspect that
you have a short between the Furuno antenna power and the Z3815A antenna
power.

On Sat, Aug 11, 2012 at 1:51 PM, jmfranke <jmfranke at cox.net> wrote:

> Have you tried commanding a survey to get the receive to ignore the old
> location?
>
> :PTIME:GPSYSTEM:POSITION:SURVEY ONCE
>
> John WA4WDL
> --------------------------------------------------
> From: "Morris Odell" <vilgotch at bigpond.net.au>
> Sent: Saturday, August 11, 2012 7:27 AM
> To: <time-nuts at febo.com>
> Subject: [time-nuts] Fun with the Z3815
>
>
>  HI all,
>>
>> I posted a question recently here for a friend re a Z3815 not receiving,
>> having formerly been perfect.  Here's what he says now:
>>
>> " I've done more testing with my HP3815A. Firstly I rewired the coax cable
>> between the external antenna connector and the PCB - there was some
>> evidence
>> of snagging on the outside of the cable where it passes through the metal
>> casing. However, no improvement in performance resulted. Also the blocking
>> capacitor referred to turns out to be an inductor. DC is making it through
>> to the antenna amp, and there is continuity along the whole route from
>> N-connector to the Furuno GPS receiver input.
>>
>> The status screen on Hyperterminal shows that something is happening,
>> however. The SYNCHRONIZATION section on the display showed outputs
>> invalid,
>> TFOM = 9 and FFOM = 3 (i.e. no sync). But the ACQUISITION section showed
>> that although no satellites had been tracked, several had been detected -
>> in
>> fact 9 of them.  Also, the correct date and time were displayed. The LAT
>> and
>> LONG data was incorrect, being the original northern hemisphere figures.
>> Health monitor reads OK and there are no ALARMS. So the receiver appears
>> to
>> be picking up enough information to show the satellites' PRN, EL and AZ
>> (and
>> furthermore they change between readings) as well as the date and time.
>> What's more the time displayed is local time!"
>>
>> Any suggestions as to what's going on?
>>
>> Morris
>>
>>
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>>
>
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