[time-nuts] Brandywine GPS Master Clock help

Mark G Thomas Mark at Misty.com
Sun Oct 1 22:27:48 UTC 2017


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



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