[time-nuts] TrueTime XL-AK Issues

Richard Solomon w1ksz at outlook.com
Fri May 25 17:19:29 EDT 2018


The second unit locked up and showed 4 satellites at the time I looked.

Next step is to replace the battery and see if it saves the setup.


In particular, I will be interested in seeing if it stores the date OK.


I found in the first unit what looked like a bad solder joint, but after

fixing that it still shows an "Open" Antenna. Unless I have a major

brain bleep, it will be relegated to Organ Donor status.


But, one out of two ain't bad !!


73, Dick, W1KSZ


Sent from Outlook<http://aka.ms/weboutlook>
________________________________
From: Richard Solomon
Sent: Thursday, May 24, 2018 3:46:16 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TrueTime XL-AK Issues


Well, I think one unit has had it. It says the Antenna is open. If I

connect the coax to the second unit, it says the Antenna is OK.


A look at the board reveals nothing amiss, but I'll put it aside

and look closer later. If nothing else it becomes an Organ Donor.


The second unit is doing a sky survey now. I'll give it a few more

hours to see what develops.


Thanks, Dick, W1KSZ


Sent from Outlook<http://aka.ms/weboutlook>
________________________________
From: time-nuts <time-nuts-bounces at febo.com> on behalf of paul swed <paulswedb at gmail.com>
Sent: Wednesday, May 23, 2018 6:39:05 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TrueTime XL-AK Issues

Great to hear let us know how it turns out.
Regards

On Wed, May 23, 2018 at 4:58 PM, Richard Solomon <w1ksz at outlook.com> wrote:

> In further button pushing, I found the Date was 1998 !! So, I manually
> reset the Date
>
> and Time and it's now doing a Satellite search.
>
>
> The previous measurements must have been some artifact of Holdover.
>
>
> One is now merrily searching, I'll let it run for a while.
>
>
> And, I think you are correct, the Battery must surely be dead by now. I'll
>
> look into replacing it.
>
>
> Thanks for replying,
>
>
> 73, Dick, W1KSZ
>
>
> Sent from Outlook<http://aka.ms/weboutlook>
> ________________________________
> From: time-nuts <time-nuts-bounces at febo.com> on behalf of paul swed <
> paulswedb at gmail.com>
> Sent: Wednesday, May 23, 2018 12:56:46 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] TrueTime XL-AK Issues
>
> Wow
> They actually came up. A site survey can take some 20 hours.
> There should be some LED indicator that says the status is locking.
> Let them run a day or two.
> If there is a LI battery to retain information that may be long gone.
> Replacing that would give you a fatser start.
> Had to do this on some Odetics receivers.
> Good luck
> Paul.
>
> On Wed, May 23, 2018 at 3:26 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > Hi
> >
> > My guess would be that they are not in a mode that allows them to lock.
> > Some
> > GPSDO’s require a “start” command. Others hold off locking until a site
> > survey
> > is complete ( or they have verified the last survey is correct ).
> >
> > Bob
> >
> > > On May 23, 2018, at 1:31 PM, Richard Solomon <w1ksz at outlook.com>
> wrote:
> > >
> > > I have had two of these sitting on the shelf for years. Today I decided
> > to see if they work.
> > >
> > > It's a slow week !!
> > >
> > >
> > > I hooked them up to my external GPS Antenna through my Symmetricon
> > Splitter and
> > >
> > > looked at the 10 MHz output on my HP 5334B (reference input derived
> from
> > a Trimble
> > >
> > > T-Bolt).
> > >
> > >
> > > They both show a number of Satellites, but one reads 4.7 Hz low while
> > the other reads
> > >
> > > 1.3 Hz low. I expected better.
> > >
> > >
> > > Any thoughts on what would cause such a large deviation from 10 Mhz ?
> > >
> > >
> > > Thanks for any replies,
> > >
> > >
> > > 73, Dick, W1KSZ
> > >
> > >
> > > Sent from Outlook<http://aka.ms/weboutlook>
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