[time-nuts] Trimble SVeeSix -- was DATUM 9390-52054 Grief again...
Robert Atkinson
robert8rpi at yahoo.co.uk
Sun Apr 7 14:53:57 EDT 2013
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
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