[time-nuts] Trimble SVeeSix -- was DATUM 9390-52054 Grief again...

GandalfG8 at aol.com GandalfG8 at aol.com
Sun Apr 7 15:29:15 EDT 2013


Hi Robert,
 
I'll keep my fingers crossed for future confirmation:-)
 
I'm not familiar with the Nav-Guide 4700, and I couldn't find anything on  
it either, but I do have both the Ace2 and Ace3 manuals if you need them.
 
>From what I remember the manual drawings aren't really detailed enough to  
distinguish between the two, but I've also got kit using Ace2 and Ace3 
modules  so could assist with identification if required.
 
regards
 
Nigel
GM8PZR
 
 
In a message dated 07/04/2013 19:56:23 GMT Daylight Time,  
robert8rpi at yahoo.co.uk writes:

Hi   Nigel, 
Had a dig and did not find a placer (yet, I've a lot of stuff up  there :-) 
Did find a small Nav-Guide 4700 that seems to be a VHF differential  system 
with a Trimble ACE  GPS. Can't find any info on  it.


Robert  G8RPI.



________________________________
From:  "GandalfG8 at aol.com" <GandalfG8 at aol.com>
To: time-nuts at febo.com  
Sent: Sunday, 7 April 2013, 19:16
Subject: Re: [time-nuts] Trimble  SVeeSix -- was DATUM 9390-52054 Grief 
again...

Hi Robert

I'd  certainly be interested to hear what you find as I've been after a   
couple of spare SVeeSixes or Eights for some time now, although the Placer  
400  
itself doesn't seem to be very common these days  either.

I've looked again at the comment stating it's not an SVeeSix  and it does  
seem a bit odd as the startup message quoted certainly  matches what I see  
from an SVeeSix in a Rapco 1804M, so I'm not sure  what caused the  
insistence 
that it  isn't.

Regards

Nigel
GM8PZR


In a message dated  07/04/2013 18:51:22 GMT Daylight Time,  
robert8rpi at yahoo.co.uk  writes:

Hi  Nigel,
I've had a couple of early Placers and am  fairly sure it was a SVee6  but 
it was some time ago. I bought it  surplus in the USA in 1998. I may still  
have one up in the attic.  I'll go and dig.

Robert   G8RPI.




________________________________
From:   "GandalfG8 at aol.com" <GandalfG8 at aol.com>
To: time-nuts at febo.com   
Sent: Sunday, 7 April 2013, 18:37
Subject: Re: [time-nuts]  Trimble  SVeeSix -- was DATUM 9390-52054 Grief 
again...

Hi  Robert,

You  need to be careful on this one.

I've never  owned a Placer 400, so can't  be 100% sure, but whilst  I have  
seen it suggested that it contained  an SVeeSix I've have also   seen at 
least 
one quite emphatic comment,  from a not very  happy  user, stating that 
it's 
definitely not an  SVeeSix, but  that there was a  firmware upgrade 
available 
for the  Placer  400 at one time to  make it SVeeSix compatible, whatever 
that   
might imply.

What I can confirm is that the version that's  more  generally available on 
 
Ebay, the Placer 450, consists of  a single  board inside the housing that  
integrates a GPS  receiver with the  control section.
I discovered this the hard way  after I bought a couple,  and expecting  
them 
to contain one  of the usual Trimble GPS modules  with  a separate PCB for 
the  control section, silly  me:-)

Quite what the GPS section of that  board might be derived from I  don't  
know, but it would seem  very unlikely that it's going to be a  drop in  
replacement for  a standard  module.

Nigel
GM8PZR



In a message  dated 07/04/2013  17:47:40 GMT Daylight Time,   
robert8rpi at yahoo.co.uk  writes:

Hi,
IIRC the early Trimble  Placer vehicle tracking GPS  receivers  used the 
SVee6 and  SVee8. I think the Placer 400  used  the SVee6. These  units  
turn 
up on 
ebay etc at very low  cost.

Robert    G8RPI.




________________________________
From:    "GandalfG8 at aol.com" <GandalfG8 at aol.com>
To: time-nuts at febo.com   
Sent: Sunday, 7 April 2013, 8:53
Subject: [time-nuts] Trimble   SVeeSix  -- was DATUM 9390-52054 Grief 
again...

The Trimble  TNL  22880-B was  indeed the original SV6, or SVeeSix as   
Trimble  
chose to call it, I  have just confirmed this from  a photo I took  some  
time 
ago, and of  which I can  supply a copy if  required.

The SVeeSix manual from 1992  is    here.....
http://rapidshare.com/files/446743737/Trimble_SveeSix.pdf

and    a much smaller, optimised version,    here......
http://rapidshare.com/files/446744995/Trimble_SveeSix_Optimised.pdf

Thanks    for these should be directed to Rob Kimberley on the list who   
provided the original printed copy.

This original SVeeSix  was   approx 4 x 3.5 inches and was  eventually 
replaced by  the  SVeeEight  of similar appearance and  again the same  
size.
The  SVeeSix Plus and  SVeeEight Plus were the same modules  mounted  in  
metal 
boxes.
The  SVeeEight Plus manual  from 2000 is available  on the Trimble ftp  
site.

I know  of at least one application  where an SVeeEight PCB module  has 
been  

used as a drop in  replacement for an SVeeSix, the Rapco   1804M GPS 
frequency  
standard, albeit using the opposite serial  port,  but don't know if  this 
was 
an "out of the box" drop  in or whether the port  needed  to be configured  
 
first.

The smaller, 1.8 x 3.3 inches,   version of the  SVeeSix is  the 
SVeeSix-CM3 
embedded module, and  the  1997  manual for that is also on  the Trimble 
ftp 
site in  the   manuals/CM3 folder.

It's possible that an SVeeSix-CM3 could   be  configured as an SVeeSix  
replacement but I've not   investigated this,  both the SVeeSix and 
SVeeEight 
came   
fitted with 1 or 2 standard  serial ports on DB9 connectors,  the  
SVeeSix-CM3 
used  an 8 pin header  with I/O at  TTL    levels.

Regards

Nigel
GM8PZR



In a   message  dated 06/04/2013 23:10:28 GMT Daylight Time, biwa at att.net   
writes:

(Note:  additional information about the   receiver  module has been   
added.)

Burt

Gang,

You will  remember several  months  ago I  had some stranges that I 
thought were   related to a  defective Vectron  oscillator in one of my  
DATUM   9390-52054.  That turned out to be a  the  internal switching  
power supply so I replaced it with an  external  Cisco  unit.   I've done 
this in three  units, two are mine and  one  belongs to Stu,   K6YAZ.

Well, I now have a different  grief in one of  my   units.  It had been 
cooking along  swell with no  problem ever since  I  replaced the power  
supply.   This morning I notice that one of  my  units had  the lock and  
tracking lights out.  The display  said that   the  signal level was low 
and there were no usable   satellites.   The 10  MHz output is also about 
20 or more  dB  low.  I  assumed the power  supply is all right  because 
the  display was  working and it said it was  9-E9,  not so good, but  
working -  sorta.  I swapped antennas and  the  good Datum was  happy so  
I know the antenna is  ok.  when I got inside  I checked   the power 
supply  rails and they're within .05 Volts of where   they  should  
be.  There is 5 Volts on the GPS module and there  is   4.96  Volts on 
the antenna Type-N connector (measured with   the  antenna line  
disconnected.)  Power cycling the  DATUM  did not  resolve the  problem.

Does anyone know  if the  symptoms above will  occur if the 10  MHz  
oscillator is  defective?  I can understand  it not  tracking or not  
locked, but could this cause the receiver to   not see or indicate  any  
satellites?  Since I only have  two of  these units on  line, I'm very  
reluctant to start  swapping modules  because I  would be without any  
working  reference, so I need to keep  one  up and running.  Both of  my  
units are on a UPS, and   according to the clocks in  the kitchen, the  
bedroom, and the  old  VCR, we've not had  a power interruption.

I do  not  recognize the  GPS  receiver module, but it has the following 
number  on   it:   TNL 22880-B.  I have the schematics for the  overall  
DATUM   9390-25054, but the GPS module in just a   block.  By the way, 
the  GPS  block on the DATUM  overall  schematic is marked, "SV6 /  
(TANS)".  I   suspect this  means something noteworthy.

Any  guidance would  be   appreciated.

Thanks,

Burt

Burt I.   Weiner   Associates
Broadcast Technical  Services
Glendale,   California    U.S.A.
biwa at att.net
www.biwa.cc
K6OQK   

_______________________________________________
time-nuts    mailing  list -- time-nuts at febo.com
To unsubscribe, go to   
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and   follow  the  instructions    there.

_______________________________________________
time-nuts    mailing list -- time-nuts at febo.com
To unsubscribe, go to   
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and  follow  the  instructions    there.
_______________________________________________
time-nuts   mailing  list -- time-nuts at febo.com
To unsubscribe, go to   
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and  follow  the  instructions   there.
_______________________________________________
time-nuts  mailing  list -- time-nuts at febo.com
To unsubscribe, go to   
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow  the  instructions   there.
_______________________________________________
time-nuts  mailing  list -- time-nuts at febo.com
To unsubscribe, go to   
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow  the  instructions  there.
_______________________________________________
time-nuts mailing  list -- time-nuts at febo.com
To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions  there.
_______________________________________________
time-nuts mailing  list -- time-nuts at febo.com
To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions there.


More information about the time-nuts mailing list