[time-nuts] FURUNO GT-80 for Brandywine GPS-4

[Mark G Thomas]

Hi again,

As best I can tell the FURUNO GT-80 GPS module in my Brandywin GPS-4 is bad.

The module says: GT-80B5F

Does anyone have any suggestions for fixing or replacing the GT-80 ?

Mark


On Sun, Oct 01, 2017 at 06:27:48PM -0400, Mark G Thomas wrote:
> Hi,
> 
> I picked up a Brandywine GPS Master Clock today at a hamfest and am
> hoping to get it working.
> 
> It came with a 3-ring binder with dip switch settings and ASCII command 
> descriptions.
> 
> Based on prior postings, it seems like it's serial port behaves a lot
> like their GPS-4 model.
> 
> My unit had a bad DC to DC converter, so I bypassed it and am running the
> thing off a 15V DC supply at least for now, measuring 5VDC out of the little
> switching regulator, and 11.5 out of the 12VDC regulator.
> 
> I suspect there may be something wrong with the GPS module, but would
> welcome feedback from group members.
> 
> I have tried both the GT1M "High Gain Amplified GPS Antenna" that I received
> with this, and a GAA3 2.5-12V "Active L1 Band" antenna, with the same results.
> This unit is pristine looking, like it was never used or messed with.
> It came with a beautiful TrueTime RD-2 IRIGB display.
> 
> Here is what I get on the serial port (just pins 2,3, and 5 connected).
> 
> -----------------------------------------------------------------------------
> L=load ESC=RUN.....
> Set/Clr RAM 
> Set DUART 
> TFS Ltd C Tue Nov 22 2005 21:05
> support at timefreq.com
> Testing IC19 RAM...PASS
> DFLTS->RAM
> 
> Testing ROM/FLASH......PASSED  Cksum =  37BC
> Testing Indicators........
> Osc is BW 5P XTAL1 Cal found
> Set PLL...PLL OK Slope Pos
> TC1=AFNOR  TC2=as TC1
> Pulse 1 msg: $PRCCG,C,U000000,+100*65
> Pulse 2 msg: $PRCCG,K,UXXXX00,+100*6D
> TimCod msg : $PRCCG,E,5,1,2,3*29
> Offset msg : $PRCCG,O,U,+00:00*62
> Alarm Masks
>  1234 5678
>  1111 0000
> Posn Ave ON
> Set Timers
> Run GPS4 EGPS31F
> 
> t00:00:04.170 01/01/04 001 4 5
> 
> t00:00:05.315 01/01/04 001 4 5                                                           
> a
> $PRCCG,A,31F,00:00:05,01/01/04,5,0,1,0000,00*59
> 
> e
> $PRCCG,E,5,1,2,3*29
> 
> f
> $PRCCG,F,+0,+0,+0,+0,+1.4E-9,+0.0E-10,001:00:00:00,+69.7,60,04,09*03
> 
> h
> $PFEC,GPanc,,*47
> 
> l
> $GPGSV,1,1,00*79
> 
> n
> $PRCCG,N,31F,-----------,00*62
> 
> p
> $GPGGA,,,,,,0,,,,M,,M,,*66
> 
> s
> $GPRMC,,V,,,,,,,,000.0,W*48
> 
> t00:00:07.252 01/01/04 001 4 5
> t00:00:07.659 01/01/04 001 4 5
> -----------------------------------------------------------------------------

-- 
Mark G. Thomas (Mark at Misty.com), KC3DRE