[time-nuts] Trimble SVeeSix -- was DATUM 9390-52054 Grief again...
GandalfG8 at aol.com
GandalfG8 at aol.com
Sun Apr 7 07:53:15 UTC 2013
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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