[time-nuts] Fun with the Z3815

Bob Camp lists at rtty.us
Sat Aug 11 17:01:07 UTC 2012


Hi

As I recall, this was a 3815 that was working and then stopped working. 

If it's back to it's original location, then the "new" location from the survey was never saved to eprom. Once he gets a new survey, make sure to save it. If it's not saved, the unit will revert to the old location every time the power is cycled.

Bob

On Aug 11, 2012, at 7:27 AM, Morris Odell <vilgotch at bigpond.net.au> wrote:

> 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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