KIWI - Precision Timestamp Utility




[Tone] KIWI is a software program only, it is up to the USER to obtain a suitable GPS receiver and wire it up. What features and how complex the wiring, is left as a hobby project for the user. However for those that may wish to see what someone else has done with the wiring, the following text by Don Oliver details how he has wired his SV6's. At the end of this page, Don documents how he wired his SV6 to a ASTROSV6 and used the "Virtual" GPS mode of KIWI.

Many thanks to Don for writing this up for us.








An example
SV6 wiring and construction document
for Trimble SVeeSix (SV6) GPS
running with TAIP version of KIWI
by
Don Oliver
Houston, Texas USA
dlokho@yahoo.com
09/11/02
version A

Overview and general information:
--------------------------------

This document includes information on parts and instructions
for preparing a Trimble SVeeSix (SV6) GPS unit currently running with a
TAIP version of KIWI, a program written by Geoff Hitchcox, New Zealand.

Also included is an appendix of specifics on the SV6 units I used.

KIWI must be run in pure DOS mode and not a window in any version
of Windows on any computer.

The two computers I use to run KIWI are:
486 66Mhz DX-2 clone
386 20Mhz clone

The output of the SV6 must be converted from TTL to RS232
so it can be run by a computer program.

KIWI will communicate with the SV6 via RS232 ports LPT1 and COM1 or COM2.

Below I will document what I did to get the SV6 hooked up and running
with the KIWI program.

For more information on the MAX233 and connection instructions -
follow the instructions from B. G. Micro or go to

BG Micro

where a PDF document file is available or I can send you the PDF file
if you can't find it or it's not there anymore.

The pin-out changes on the SV6 are documented in the B.G. Micro
document also but much better explained with examples by

George Silvis

KIWI requires wiring of a DB25M connector and a DB9F connector.

The DB9F connector is documented in the B.G. Micro documentation
and is used by KIWI to communicate with the SV6.

The DB25M connector will service the KIWI switch and LED.

To save typing and condense information,
I will use conventions such as MAX233-n,
where n would be a pin number on the MAX233,
or SV6-n, for another example,
which would refer to the pin number n of the SV6, etc...

If a pin number does not go "to" anything, then, it's not used.

I will also use a wire color to identify a cable wire. The color is
mainly for my benefit since I will also refer to this document for my
own purposes, so your colors may be different or you elect to use a
different color, so keep that in mind and you might want to just copy
portions of this file if you choose to use it and just modify any colors
you change, for your own documentation and future reference.

Note that it would be good to try to keep the colors the same as much as
possible for common paths, but prototyping created the mis-match of
colors I have which could only be corrected by un-soldering which I
decided not to do.

And of course, your parts as well as colors may vary.

Ground is common, and Vcc is 5 volts DC+


The following abbreviations are used in the parts lists.
EPO = Electronic Parts Outlet, Houston, Texas
RS = Radio Shack
BGM = B.G. Micro


There are three basic components hook-up descriptions,
the SV6 Cabinet,
the KIWI switch box with LED controls,
and the KIWI switch only.

I have not documented every detail of preparation,
but have tried to include all wiring information,
diagrams, and parts descriptions that would be
of most use and value later to myself and someone else
who might wish to prepare the SV6 for use with KIWI.

---------------
The SV6 Cabinet:
---------------

Function:
--------
To house the SV6 and integrated circuits and provide
connections for power, antenna, computer, and KIWI functions.


             SV6 Cabinet BACK

             .....................................................
             .                                                   .
             .  DB9F         PWR                          DB25M  .
             .   o           SOCKET          SO-239        o     .
             . 1..                          .........   13..     .
             .  . .6          (o)           .o     o.     . .25  .
             .  . .9                        .  (o)  .     . .    .
             . 5..                          .o     o.     . .    .
             .   o                          .........     . .    .
             .                                            . .    .
             .      SV6                     ANT-SVC       . .    .
             .      ANT                       HOLE        . .14  .
             .      JACK                                1 ..     .
             .                                (  )         o     .
             .      (o)                                          .
             .....................................................


             SV6 Cabinet FRONT

             .....................................................
             .                                                   .
             .                                                   .
             .       ON          KIWI LED          5 PIN DIN     .
             .     .......         green             socket      .
             .     .  o  .          (*)                          .
             .     .     .                             2         .
             .     .     .                           4   5       .
             .     .     .          (*)             1     3      .
             .     .......       1PPS LED              G         .
             .      OFF             red                          .
             .                                       connects    .
             .                                       KIWI        .
             .                                       switch box  .
             .                                                   .
             .....................................................



             SV6 Cabinet TOP

                DB25M       SO-239             PWR         DB9F
             .....................................................
             .                          .o .                  .o .
             .                          . A=                  .  .
             .     ..                   . 6=                  .  .
             .     .. c                2=  .      SV6         .  .
             .     .. i                4=  .     UpSide       .  .
             .     .. r                 .  .      Down        .  .
             .     .. c                8=  .                  .  .
             .     .. u                7=  .                  .  .
             .     .. i                5=  .                  .  .
             .     .. t                3=  .                  .  .
             .     ..                   .  .                  .  .
             .     .. b                 .o .                  .o .
             .     .. o                 ...........................
             .     .. a                                          .
             .     .. r       ...............                    .
             .     .. d       . -=========+ .                    .
             .     ..         . +=========- .                    .
             .                . -=========+ .                    .
             .                .  3 x AAA    .                    .
             .....................................................
                     ON             PPS            5 PIN DIN






             SV6 Cabinet  LEFT SIDE

       .                     circuit board back                        .
       .             .....................................             .
       .             . -----------------------    7805   .             .
       .             . +++++++++++++++++++++++    o O    .             .
       .             .                            o G    .             .
       .             .  1       10  1      8      o I    .             .
       .             .  oooooooooo  oooooooo             .             .
       .             .  MAX233      74LS123              .             .
       .             .  oooooooooo  oooooooo             .             .
       .             .  20      11  16     9             .             .
       .             .                                   .             .
       .             .                                   .             .
       .             .                                   .             .
       .................................................................
       . (((sv6)))   o                                   o             .
       .................................................................


             SV6 Cabinet RIGHT SIDE

       .                     circuit board front                       .
       .             .....................................             .
       .             .   7805    ----------------------  .             .
       .             .   = O     ++++++++++++++++++++++  .             .
       .             .   = G                             .             .
       .             .   = I      8      1  10       1   .             .
       .             .            ========  ==========   .             .
       .             .            74LS123   MAX233       .             .
       .             .            ========  ==========   .             .
       .             .            9     16  11      20   .             .
       .             .                                   .             .
       .             .                                   .             .
       .             .                                   .             .
       .................................................................
       .                                                     )))sv6((( .
       .................................................................


parts:
-----
2 x 1/4" long 4-40 machine screws and nuts to secure DB25M to SV6 cabinet
2 x 1/4" long 4-40 machine screws and nuts to secure DB9F to SV6 cabinet
4 x 1/4" long 4-40 machine screws and nuts to secure SO-239 to SV6 cabinet
4 x 1/4" long 4-40 machine screws and nuts to secure SV6 to SV6 cabinet
AC/DC Powerline Universal Adapter 3-12 volts DC 600mA
BGM ACS1053 450+ Hole Proto Board
BGM ACS1394 SVeeSix GPS and Antenna
BGM CAB1026 DB 25 Solder Cup Male
BGM CAB2050 DB9 F Solder Cup
BGM ICSMAX233 MAX233 IC
BGM REG7805T +5VDC VOLTAGE REGULATOR
EPO 6/24AWG SHIELDED with ground 10 feet
EPO 74LS123 DUAL ONE SHOT
EPO NTE 89410 100000PF 50V CERAMIC CAPACITOR
EPO NTE TD2.2M25 TANTALUM CAPACITOR 2.2MFD 25V
EPO RG174 COAX CABLE 25 feet
EPO stud bolt hardware for mounting DB chassis mount connectors
RS 270-253A Metal Utility Cabinet 3 x 5-1/4 x 5-7/8"
RS 270-412 Battery Holder for 3 AAA batteries
RS 272-1024 4.7uF Electrolytic Capacitor w/Radial leads 35WVDC
RS 272-135  0.1uF Ceramic Disc Capacitor 50WVDC High K dielectric
RS 274-005C 5-PIN DIN SOCKET
RS 274-1563A COAXIAL DC POWER JACK 5.5mm O.D. 2.1mm I.D.
RS 275-690A HEAVY-DUTY ROCKER SWITCH SPST
RS 276-022A GREEN LIGHT-EMITTING DIODES (2) T-1 3/4 size
RS 276-080A T-3/4 LED HOLDER
RS 276-1368 Anodized Aluminum Heat Sink for TO-220
RS 276-1372 Silicone-Base Heat Sink Compound
RS 276-195A PC BOARD STANDOFFS 13/16" (20mm)
RS 276-1991A 20-PIN LOW-PROFILE SOCKET
RS 276-1998A 16-PIN LOW-PROFILE SOCKETS(2)
RS 278-201 SO-239 CHASSIS-MOUNT COAX CONNECTOR
RS ?        100K resistor 1/2w


Notes:
-----
I soldered a lead of RG174 from the antenna connection on the underside
of the SV6 circuit board for possible use later to the SO-239 socket,
but have never used that path yet, so that is the only part below that
is not currently being used, but it would be advisable to make preparation
for any possible addition you might conceive now rather than try to
do that later after all the components are soldered down.

Also, it would have been a good idea to have a cover plate for the
bottom of the SV6, rather than just the bottom of the cabinet, so it
could be serviced better without un-soldering the leads to remove it.

I could not find a 50V 2.2MFD capacitor locally as B.G. Micro suggested.


7805 (printed side) connections:
-------------------------------

                    ................
                    .              .
                    .     7805     .
                    .              .
                    ................
                    .      .       .
                    .      .       .
                    .      .       .
                    .      .       .
                    .      .       .
  9-12 vdc+ ....  input    .     output .... 5vdc+++++++++++++++++++
                    .      .       .
                    .      .       .
                    .      .      (+)
                 .1uF cap  .  2.2uF tantalum cap
                    .      .      (-)
                    .      .       .
                    .      .       .
                    .....ground-------------------------------------

LED reference:

                           * *
                          * * *
                          * * *
                          .   .
                          .   .
                          .   .
                          .   .
                          .   .
                          .   . short lead is negative (-)
long lead is positive (+) .           (cathode)
     (anode)




SV6 connections
  3  5  7  8    4  2    6     A
  o  o  o  o    o  o   (o)   (o)

1
2 blue to 7805-5vdc+
3 white to MAX233-2
4 yellow to 3xAAA battery holder red +
5 black to MAX233-3
6 RG174 to MAX233-1
7
8 green to ground
A RG174 to SO-239 (pending)



MAX233 connections
      top view                 bottom solder side
    1  o U o  20                20  o U o   1
    2  o   o  19                19  o   o   2
    3  o   o  18                18  o   o   3
    4  o   o  17                17  o   o   4
    5  o   o  16                16  o   o   5
    6  o   o  15                15  o   o   6
    7  o   o  14                14  o   o   7
    8  o   o  13                13  o   o   8
    9  o   o  12                12  o   o   9
   10  o   o  11                11  o   o  10

 1 RG174 to SV6-6
 2 white to SV6-3
 3 black to SV6-5
 4 tan to DB9F-3
 5 green to DB9F-2
 6 black to ground
 7 red to 7805-5vdc+
 8
 9 black to ground
10 tan to MAX233-16
11 blue to MAX233-15
12 white to MAX233-17
13
14
15 blue to MAX233-11
16 tan to MAX233-10
17 white to MAX233-12
18 white to DB9F-6
19
20


DB9F (solder side) connections
   1   2   3   4   5
   o   o   o   o   o
     o   o   o   o
     6   7   8   9
 1
 2 green to MAX233-5
 3 tan to MAX233-4
 4
 5 black to ground
 6 white to MAX233-18
 7
 8
 9


DB25M (solder side) connections
   13  12  11  10  9   8   7   6   5   4   3   2   1
   o   o   o   o   o   o   o   o   o   o   o   o   o
     o   o   o   o   o   o   o   o   o   o   o   o
     25  24  23  22  21  20  19  18  17  16  15  14
 1
 2 green to 5 PIN DIN SOCKET-3 (KIWI LED cathode)
 3
 4
 5
 6
 7
 8
 9 4.7K resistor to DB25M-10
10 tan to 5 PIN DIN SOCKET-2 (KIWI switch)
11
12
13 white to 74LS123-4 (1PPS LED cathode)
14
15
16
17
18
19
20
21
22
23
24 solder to DB25M-25; blue to 5 PIN DIN SOCKET-1 (KIWI switch)
25 black to ground


5 PIN DIN SOCKET (solder side) connections
       2
     5   4
    3     1
       x ground not used
 1 blue to DB25M-24
 2 tan to DB25M-10
 3 green to DB25M-2
 4 red to 7805-5vdc+
 5 white to 74LS123-4


74LS123 connections
      top view                     bottom solder side
    1  o U o  16                     16  o U o   1
    2  o   o  15                     15  o   o   2
    3  o   o  14                     14  o   o   3
    4  o   o  13                     13  o   o   4
    5  o   o  12                     12  o   o   5
    6  o   o  11                     11  o   o   6
    7  o   o  10                     10  o   o   7
    8  o   o   9                      9  o   o   8

 1 black to ground
 2 RG174 to MAX233-1
 3 red to 7805-5vdc+
 4 white to 5 PIN DIN SOCKET-5; white to DB25M-13 (1PPS LED cathode)
 5
 6
 7
 8 to ground (via green jumper wire,
 9 to ground  then 74LS123 pins 8,9,10, & 11
10 to ground  connected with a piece of component lead wire
11 to ground  soldered across the pins on the back of circuit board)
12
13
14 to 4.7uF(-) cap
15 to 4.7uF(+) cap; through 100K resistor to 74LS123-16
16 red to 7805-5vdc+; through .1uF cap to ground

SV6 console LED's
1PPS red LED- white to 74LS123-4
1PPS red LED+ tan through 4.7K 1/4w resistor#1 to 5vdc+
KIWI green LED- green to DB25M-2
KIWI green LED+ blue through 4.7K 1/4w resistor#2 to 5vdc+


---------------------------------
The
KIWI Switch Box with LED controls
viewed from hook-up side
----------------------------------

Function:
--------
To provide the KIWI time-stamp, PE, and Linear Time Reduction
switch function of the KIWI program,
and select either the KIWI LED or 1PPS LED functions,
and control the on/off and brightness of the LED.



5 PIN DIN PLUG (solder side) connections
       2
     4   5
    1     3
       x ground not used
 1 green to DB25M-24 (KIWI SPST Momentary Switch)
 2 white to DB25M-10 (KIWI SPST Momentary Switch)
 3 tan to DB25M-2  (KIWI LED-)
 4 red to 7805-5vdc+
 5 black to 74LS123-4 (1PPS LED-)


                                     To scope
                        5 lead       LED
                        service       ..
                        cable         ..
                                      ..
                         green
                         white       18 gauge
                         tan         lamp cord
                         red         webbed side is negative (-)
                         black       smooth side is positive (+)
                        .....         ..
                        .....         ..
                        ......         ..
                        .....  top    ..
                    ..........................
                    .   .....         ..     .
                    .   .....         ..     .
                    .                        .
KIWI LED-    tan..............o   o          .
                    .                        .
                    .                        .
        negative side of......o   o          .
        18 gauge lamp cord                   .
        to LED-     ..                        .
                    .                        .
1PPS LED-    black............o   o          .
                    .         DPDT           .
                    .       LED FUNCTION     .
                    .       SWITCH           .
                    .                        .
                    .                        .
                    .                        .
              white.............o            .
                    .                        .
              green.............o            .
                    .          SPST          .
                    .          Momentary     .
                    .          KIWI SWITCH   .
                    .                        .
                    .                        .
                    .                        . positive side of 18
                    .        o     o...100R....gauge lamp cord
                    . ..........o            . to LED+
                    . .       Audio 10k pot  .
                    . tan     LED BRIGHTNESS .
                    . jumper                 .
                    . lead......o            .
                    .         o   o...............red
                    .         Audio on/off   .
                    .         LED ON/OFF     .
                    ..........................
                              bottom

Parts:
-----
RS 270-1802 ABS Plastic Project Enclosure 4x2x1"
RS 271-1108 100-Ohm 1/2 watt resistors (5)
RS 271-215B Mini Volume Control 10k with audio taper SPDT switch
RS 274-003A 5-PIN DIN PLUG for 5 lead service cable
RS 274-283  Mono-to-Mono Phone Plug/Jack Two pair ***SPECIFIC***
RS 275-646  SPST Momentary Push Button Switch
RS 275-691A HEAVY-DUTY ROCKER SWITCH DPDT
RS 276-1622 ASSORTED LIGHT-EMITTING DIODES (20)

18 gauge lamp cord from Home Depot

18 gauge lamp cord. My length is about 55 feet total using
1/8" phone plugs and jacks at the scope and control station
to the 50 foot service line.

5 lead service cable. My length is about 4 feet.
I used 6 lead w/ground using only 4 and not ground.



Notes:
-----
I used cable ties to secure the service cable and lamp cord.
The ties were inserted through holes drilled on the sides of the
enclosure box securing the cable and cord to the inner sides.

The 100 ohm resistor is to guard against high current to the LED
when the potentiometer is wide open.

The switch components are mounted into the bottom of the project
box, so that removing the top lid, exposes all connections.

The DPDT LED FUNCTION SWITCH can be a SPDT switch in the above case.
I had originally had different paths for the positive and negative
sides of the LED prior to this. It still might be a good idea to
use a DPDT switch incase that situation might arise in another
type of unforeseen application.



------------------------------------
The
KIWI Switch Box without LED controls
viewed from hook-up side
------------------------------------

Function:
--------
To provide the KIWI time-stamp, PE, and Linear Time Reduction
switch function of the KIWI program.

5 PIN DIN SOCKET reference:
 1 from DB25M-24 (KIWI SPST Momentary Switch)
 2 from DB25M-10 (KIWI SPST Momentary Switch)
 3
 4
 5
 G ground is not used

                              top
                    ..........................
                    .       5-PIN DIN        .
                    .         SOCKET         .
                    .     (solder side)      .
                    .  ........> 2            .
                    .  .      5   4          .
                    .  .     3     1<...     .
                    .  .        G      .     .
                    .  .               .     .
                    .  .               .     .
                    .  .               .     .
                    .  .               .     .
                    .  .........o      .     .
                    .                  .     .
                    .           o.......     .
                    .          SPST          .
                    .          Momentary     .
                    .          KIWI SWITCH   .
                    .                        .
                    .                        .
                    ..........................
                              bottom



Parts:
-----
RS 270-1801 ABS Plastic Project Enclosure 3x2x1"
RS 275-1547C MINI MOMENTARY PUSHBUTTON SWITCHES(4)
RS 274-005C 5-PIN DIN SOCKET

Male to Male 5-PIN DIN Cable 6 feet


Notes:
-----
The switch components are mounted into the bottom of the project
box, so that removing the top lid, exposes all connections.


Appendix:
--------

I have two SV6 units which I refer to as SV6-A and SV6-B.
Information on those units follow.

Later for SV6-A,
the wires of SV6-B were cut in half,
so that each unit would have colored wires the same.

The antenna resistance is about 180 ohms on each antenna.

-----
SV6-A
-----

Antenna
 MICRO PULSE
 GPS ANTENNA
 PN: 2740 PZ-6/C
 DATE CODE: 26/98

Module
 Motorola MC68306PV16
          4E94M
          HHOY9746

Protocol: 34057-61
Bar Code: -750(D?) 9806

MX
J9739
33811-02
V5.10
CS=1446
69498J

TRIMBLE
18958-02
9650T
26157

YELLOW BARCODE: 2069 2400

PIN OUT INFORMATION

  3  5  7  8    4  2
  o  o  o  o    o  o

  white white   white
     white white   white


Connections for the above 6 wires viewed from the wire connecting side
of the female connector with the connector latch on the left side.


       o           o(1)
       #8          #7


       o           o
       #4          #5


       o(6)        o
       #2          #3


-----
SV6-B
-----

Antenna
 MICRO PULSE
 GPS ANTENNA
 PN: 2740 PZ-4/E
 DATE CODE: 40/98

Module
 Motorola MC68306PV16
          4E94M
          HHOY9746

Protocol: 34057-61
Bar Code: -750(D?) 9806

MX
J9739
33811-02
V5.10
CS=1446
69498J

TRIMBLE
18958-02
9650T
26157

YELLOW BARCODE: 2069 1252



PIN OUT INFORMATION

  3  5  7  8    4  2
  o  o  o  o    o  o

  white red     yellow
     black green   blue


Connections for the above 6 wires viewed from the wire connecting side
of the female connector with the connector latch on the left side.


       o           o(1)
       #8          #7


       o           o
       #4          #5


       o(6)        o
       #2          #3

----------------------------------------------------------------

The following, is an addendum to and describes required changes
to the above document, so that the Trimble SVeeSix (SV6) GPSR
running in NMEA mode would operate correctly with the
BlackBoxCamera ASTROSV6.

The modification also allows running NMEA versions of KIWI
in parallel with the AstroSV6 or the TAIP versions of KIWI
used as a Virtual GPS for the ASTROSV6.

The Virtual GPS mode requires two COM ports, COM1 and COM2.
COM1 is input for KIWI, COM2 is output to the ASTROSV6.

Also note that all connections using RG174 to carry only the
1PPS signal are connected using only the central core wire
with the insulation left in place to shield the line.

Remember your parts, colors, and design can change -
I have documented below what I have done
to get this working and should convey the necessary
information needed to accomplish that if the exact
parts below are not used, with of course the exception
of the MAX233 and 74LS123 IC's.

Don Oliver
Houston, Texas USA
dlokho@yahoo.com
05/08/03
version A

The original DB9F connector is now referenced as
ASTROSV6 DB9F and the white wire to pin 6 from
MAX233-18 is disconnected at pin 6 and replaced
with RG174 from pin 6 to 74LS123-13.

The detached white wire can be connected to pin 6 of
the new additional DB9F connector referenced as
BGMICRO DB9F

The SO-239 antenna connector is removed and the BGMICRO DB9F
connector is mounted in it's place.

The BGMICRO DB9F is wired exactly the same as the original DB9F
as follows:
BGMICRO DB9F (solder side) connections
   1   2   3   4   5
   o   o   o   o   o
     o   o   o   o
     6   7   8   9
 1
 2 green to MAX233-5
 3 tan to MAX233-4
 4
 5 black to ground
 6 white to MAX233-18 (disconnect at ASTROSV6 DB9F-6 and move here)
 7
 8
 9

The reason for the position of the DB9F connectors is a result
of original testing but does leave KIWI's connectors on one side.

The tan wire connecting pin 3 of the ASTROSV6 DB9F
to MAX233-4 was left in place but is not needed.


MAX233 additional connections
      top view                 bottom solder side
    1  o U o  20                20  o U o   1
    2  o   o  19                19  o   o   2
    3  o   o  18                18  o   o   3
    4  o   o  17                17  o   o   4
    5  o   o  16                16  o   o   5
    6  o   o  15                15  o   o   6
    7  o   o  14                14  o   o   7
    8  o   o  13                13  o   o   8
    9  o   o  12                12  o   o   9
   10  o   o  11                11  o   o  10
 1
 2
 3
 4 tan to BGMICRO DB9F-3 (needed SV6 RX)
 5 green to BGMICRO DB9F-2 (NMEA)
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20



74LS123 additional connections
      top view                     bottom solder side
    1  o U o  16                     16  o U o   1
    2  o   o  15                     15  o   o   2
    3  o   o  14                     14  o   o   3
    4  o   o  13                     13  o   o   4
    5  o   o  12                     12  o   o   5
    6  o   o  11                     11  o   o   6
    7  o   o  10                     10  o   o   7
    8  o   o   9                      9  o   o   8
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13 RG174 to ASTROSV6 DB9F-6 (1PPS)
14
15
16


ASTROSV6 DB9F (solder side) changes
   1   2   3   4   5
   o   o   o   o   o
     o   o   o   o
     6   7   8   9
 1
 2
 3
 4
 5
 6 RG174 to 74LS123-13 (1PPS)
 7
 8
 9

To simply run KIWI in parallel with the ASTROSV6
you can stop here and connect KIWI's DB9 cable
from the BGMICRO DB9F to the computers COM port
and KIWI's DB25 cable from the DB25M connector
to the computers PARALLEL port, and then connect
the ASTROSV6's DB9 short cable to the ASTROSV6 DB9F.


To run the ASTROSV6 in Virtual GPS mode using
TAIP KIWI to generate NMEA data to the ASTROSV6
you will have to build a "split cable" so that the
NMEA data comes from the COM2 port of the
computer and the 1PPS data comes from the
ASTROSV6 DB9F.


There are several ways that the "split cable"
could be fashioned and I chose this method
using RG174 since most of the cables
or cable pairs only require two wires,
is an easier cable to work with,
plus I had some extra RG174.

I also put both a DB9F plug and DB25F plug
on the part of the cable connecting to COM2
so that it could be used on either
a 9 pin COM2 or a 25 pin COM2.

You might want to read through the rest of
this document before you build the "split cable"
since I will change its design to a "break cable" later,
but it still might be easier to build the
cable in the order it is presented and then
add the modifications later as I did.
It certainly was easier to document it that way.

The cable type as previously stated
is RG174 for all of the "split cable"
and I will refer to them as:
RG174A for the 1PPS & ground cable from the DB9M plug at ASTROSV6;
RG174B for the NMEA & ground cable from the DB25F plug at COM2;
RG174C for the NMEA & ground cable from the DB9F plug at COM2.


So there will be two RG174 cables running to
the ASTROSV6 stereo plug;
one going to the ASTROSV6 DB9M plug,
and the other to the PC's COM2 DB9F and DB25F
plugs which are split out at the end of the cable,
and to be more specific,
the DB9F is split out of the DB25F.

So there are two splits,
one to split the NMEA and 1PPS data at the stereo plug,
the other splits out the COM2 plugs,
one for a 9 pin connector,
and the other for 25 pin connector.

Only one of two COM2 plugs would be used
at any time depending on whether the computer has
a 9 pin COM2 or a 25 pin COM2.

Most newer computers only have DB9M COM connectors
but some older computers have DB25M COM connectors
as well as the DB9M COM connectors.

You can also buy a DB25 to DB9 converter plug.

In my case I have a DB9M COM1 and a DB25M COM2.

The cross reference for DB9 to DB25 is as follows:

 DB9 Pin# = DB25 Pin#
 1=8
 2=3
 3=2
 4=20
 5=7
 6=6
 7=4
 8=5
 9=22

RG174A is 6 feet ( 1.83 meters )
RG174B is 11 feet ( 3.35 meters )
RG174C is 6 inches ( 15.24 cm )

Remember your lengths may vary depending
on your equipment setup.


ASTROSV6 DB9M Plug (solder side) connections
   5   4   3   2   1
   o   o   o   o   o
     o   o   o   o
     9   8   7   6
 1
 2
 3
 4
 5 RG174A ground to ASTROSV6 stereo plug ground (ground)
 6 RG174A core to ASTROSV6 stereo plug tip (1PPS)
 7
 8
 9


ASTROSV6 Stereo Plug


=====
    =
    ===============================
    =          =          =       =
    =  ground  =  center  =  tip  =
    =          =   NMEA   = 1PPS  =
    ===============================
    =
=====

ground to RG174A ground and RG174B ground (ground)
center to RG174B core (NMEA)
tip to RG174A core (1PPS)



PIN CONNECTIONS FOR the DB9F Plug to KIWI COM2 (solder side)
   1   2   3   4   5
   o   o   o   o   o
     o   o   o   o
     6   7   8   9
1
2
3 RG174C core to DB25F Plug-2 (NMEA)
4
5 RG174C ground to DB25F Plug-7 (ground)
6
7
8
9




PIN CONNECTIONS FOR the DB25F Plug to KIWI COM2 (solder side)
   1   2   3   4   5   6   7   8   9   10  11  12  13
   o   o   o   o   o   o   o   o   o   o   o   o   o
     o   o   o   o   o   o   o   o   o   o   o   o
     14  15  16  17  18  19  20  21  22  23  24  25


 1
 2 RG174C core and RG174B core (NMEA)
 3
 4
 5
 6
 7 RG174C ground and RG174B ground (ground)
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

Above is the basic "split cable" to run KIWI VGPS.


"break cable"
-------------
For added functions for the "split cable" and
to be able to test behavior of the ASTROSV6
I cut the RG174A and RG174B cables 3 feet
back from the stereo plug and put an inline
red phone jack on RG174A (1PPS)
and a black inline phone jack on RG174B (NMEA);
the above phone jacks are on the cable segments
attached to the stereo plug.

Note that the ground wires of the RG174 cables
are attached to the ground of the inline phone
jacks/plugs, and the core is attached
to the tips in all cases.

Then on the other cut end of RG174B I put a
black inline phone plug on it so it could be
attached back to the other segment of RG174B
coming from the stereo plug and ended with
a black inline phone jack (NMEA).

Then on the other cut end of RG174A I put a
red inline phone plug on it so it could be
attached back to the other segment of RG174B
coming from the stereo plug and ended with
a red inline phone jack (1PPS).

Then an extra 3 foot ( 0.91 meter ) RG174
cable (RG174D for reference) was added to
the ASTROSV6 DB9M Plug and ended with a
black inline phone plug referenced as "D".

So the complete wiring for the ASTROSV6 DB9M Plug is now:

ASTROSV6 DB9M Plug (solder side) connections
   5   4   3   2   1
   o   o   o   o   o
     o   o   o   o
     9   8   7   6
 1
 2 RG174D core to black inline phone plug "D" tip (NMEA)
 3
 4
 5 RG174A ground to red inline phone plug ground (ground)
   and RG174D ground to black inline phone plug "D" ground
 6 RG174A core to red inline phone plug tip (1PPS)
 7
 8
 9


So the above modified cable now allows easily:
o  changing the NMEA source (SV6 or KIWI VGPS)
o  breaking the 1PPS line to analyze ASTROSV6 behavior
o  breaking the NMEA source to analyze ASTROSV6 behavior
o  breaking both NMEA and 1PPS to analyze ASTROSV6 behavior

Plus some other things you need to think twice before doing.

I use masking tape and a ball point pen to identify cables.

Be careful of exposed phone plugs that they don't short out by
touching a metallic object. I use a piece of tubing slipped
over plugs not being used to protect against that happening.

Black is NMEA
Red is 1PPS


added parts:
------------

EPO stud bolt hardware for mounting DB chassis mount connector
Radio Shack 276-1538 9-Position*Female D-Sub Connector (DB9F)

Radio Shack 276-1538 9 position Female D-Sub Connector
Radio Shack 276-1539D D-SUBMINIATURE CONNECTOR HOOD FOR 9 & 15 PIN CONNECTORS

BGMicro CAB1027 - DB 25 Solder Cup Female
Radio Shack 276-1549D D-SUBMINIATURE CONNECTOR HOOD FOR 25 PIN CONNECTORS

EPO RG174 cable

for the "break cable":
Radio Shack 274-284 Pkg. of 2 1/8" Stereo Phone Plug
Radio Shack 274-283 Mono-to-Mono Phone Plug/Jack Set (TWO PAIR)

---------------
The SV6 Cabinet:
diagram changes
---------------


             SV6 Cabinet BACK

             .....................................................
             .ASTROSV6                       BGMICRO             .
             .  DB9F         PWR              DB9F        DB25M  .
             .   o           SOCKET             o          o     .
             . 1..                            1..       13..     .
             .  . .6          (o)              . .6       . .25  .
             .  . .9                           . .9       . .    .
             . 5..                            5..         . .    .
             .   o                              o         . .    .
             .                                            . .    .
             .      SV6                                   . .    .
             .      ANT                                   . .14  .
             .      JACK                     ANT-SVC    1 ..     .
             .                                (  )         o     .
             .      (o)                       HOLE               .
             .....................................................



             SV6 Cabinet TOP
                            BGMICRO                      ASTROSV6
                DB25M        DB9F              PWR    ANT  DB9F
             .....................................................
             .                          .o .                  .o .
             .                          . A=                  .  .
             .     ..                   . 6=                  .  .
             .     .. c                2=  .      SV6         .  .
             .     .. i                4=  .     UpSide       .  .
             .     .. r                 .  .      Down        .  .
             .     .. c                8=  .                  .  .
             .     .. u                7=  .                  .  .
             .     .. i                5=  .                  .  .
             .     .. t                3=  .                  .  .
             .     ..                   .  .                  .  .
             .     .. b                 .o .                  .o .
             .     .. o                 ..........................
             .     .. a                                          .
             .     .. r       ...............                    .
             .     .. d       . -=========+ .                    .
             .     ..         . +=========- .                    .
             .                . -=========+ .                    .
             .                .  3 x AAA    .                    .
             .....................................................
                     ON            KIWI            5 PIN DIN
                     --            1PPS            ---------
                     OFF           LED's          KIWI SWITCH


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