Hi All,
Up until now we've been interfacing my Motorola M12+T's using the Oncore
software. However, at this point we are trying to have it interfaced
directly to a FPGA. To my mind this should be simple - the commands are
discriminated (framed) by looking at the start and terminating bytes
Looking at the user guide which is the extent of my experience. Would the
position version of the M12+ be a better choice for your application ? That is
trade NMEA-0183 for all the timing features ?
Stanley
Link to user guide :
Aren't potential terminating chars doubled up if in the datastream?
Check the protocol specification very carefully.
Cheers
Dave
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Stephan Sandenbergh
Sent: 19 November 2008 14:30
To: Discussion of precise
I have just the beast for you - an HP 4951C with serial adapter!!! That well
let you really see what's in the datastream.
Dave
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Hi Stephan:
Check the manual for stuffing, it's not a Thanksgiving term here but has to
do with what happens when a byte in a binary data stream (the data in the
Motorola protocol is all binary, not ASCII) is the same as the ASCII @
character. This means that the length of a packet is
I love my new Trimble Thunderbolt.
Thank you TAPR and Time-Nuts!
I was thinking of putting insulation
all around the Thunderbolt to thermally
stabilize it. It's in my basement and
the temperature there rarely gets above
18 C.
That would also help with my dedicated
power supply, as the 12
The problem is knowing how much insulation. If you use too much insulation,
the Thunderbolt will overheat. I would just block any direct drafts and let
the unit do what it was designed to do.
John WA4WDL
- Original Message -
From: Mike Naruta AA8K [EMAIL PROTECTED]
To:
Stephan,
Ah, it's not a stupid question -- I think all of us who have written
code to interface with GPS receivers have had to deal with this.
Some GPS protocols use escape characters, but the Oncore
binary protocol doesn't. There are five clues to robustly parsing
a complete message:
1) starts
I was thinking of putting insulation all around the Thunderbolt to
thermally stabilize it. It's in my basement and the temperature there
rarely gets above 18 C.
That would also help with my dedicated power supply, as the 12 volt
sags when the Thunderbolt is started. The power supply is
I think isolation may work better than insulation. The latter
attenuates external temperature variations from getting in but
at the same time also necessarily restricts heat flow going out.
The result is gradual overheating.
You might first want to determine just how temperature sensitive
your
Personally, I'd just leave the TBOLT to get on with the job.
It's probably a good idea to exclude draughts, but adding further
insulation will probably not help matters and may hinder them. I'm
thinking specifically of what happens to the ambient compensation of
OCXOs when the insulation thermal
It appears that CHU on 7.335MHz will soon be moved. While CNRC can
keep transmitting on the frequency, so can broadcasters in other
countries now use it. I have been hearing World
Harvest Radio WHRI in the United States broadcasting on top of it at
times. The word I got from NRC-INMS is that
Thanks for the heads up!
John WA4WDL
- Original Message -
From: David McGaw [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, November 19, 2008 3:06 PM
Subject: [time-nuts] CHU: do not stay tuned...
It appears that CHU on
Tom Van Baak wrote:
Stephan,
Ah, it's not a stupid question -- I think all of us who have written
code to interface with GPS receivers have had to deal with this.
Some GPS protocols use escape characters, but the Oncore
binary protocol doesn't. There are five clues to robustly parsing
a
On Wed, 12 Nov 2008 21:27:10 -0600, Bill Hawkins [EMAIL PROTECTED] wrote:
My apologies, but I didn't think you'd want to hear about jumps.
My good friend, and software genius, was late for a lunch appointment
today. The atomic alarm clock that he has used for years was 3.3
hours behind this
On Sun, 16 Nov 2008 23:03:15 +0100, Björn Gabrielsson [EMAIL PROTECTED]
wrote:
On a much smaller scale... but the incident shown in the attached
picture was no fun either... two old BVAs came the standard (brutal)
post service packed like in the picture.
Do y'all have UPS down there? That
On Sun, 16 Nov 2008 15:01:23 -0800, Hal Murray [EMAIL PROTECTED]
wrote:
[EMAIL PROTECTED] said:
It looks like the entire shipping case has been dropped or turned over
from a reasonable height. The 7mm thick internal glass cylinder has
been shattered and inside that the glass bulb has been
Stephan,
can you give us a clue what it is all about? What happens with the data
after being decoded by the FPGA?
Best regards
Ulrich Bangert
-Ursprungliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von Stephan Sandenbergh
Gesendet: Mittwoch, 19.
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