Re: [time-nuts] DeLorme Tripmate GPS receiver

[Mike Cook]

> Le 23 déc. 2014 à 01:41, Ryan Stasel  a écrit :
> 
> Ed, 
> 
> Not 100% sure this is the same model, but it would seem to indicate there's a 
> PPS signal on the DCD pin (from the gpsd-users list circa 2007): 
> http://marc.info/?l=gpsd-users&m=118340900010559&w=2
> 
> Have a 'scope to check what that pin looks like?
> 

 Unfortunately, according to 
 , this signal is not 
available on the DB9 output.
I have a working Jupiter TU60-D120 timing receiver which appears to use this 
chip (sourced from Sirf) which has a 1PPS on the headers pin6. I spent some 
time yesterday trying to trace back that pin to the 11577-11, but failed. I 
think I would need to probe it under power to go further but am hitting a 
couple of issues that are holding me up.  
The first is plain logistics. I have no free 12V power for the mother board 
(supplies buffered 10KHz and 1PPS on SMA plus a DB9 out) and the second more 
important is that I don’t know how to be sure of not shorting the 11577-11 pins 
when probing if it is power up. It’s a .5mm pitch chip and my probe which is 
pointed has the habit of slipping off the pins. There must be special tips to 
prevent that but I don’t have one. Any tips (as in help) appreciated. Another 
difficulty is keeping an eye on the scope while at the same time probing. This 
is a recurring problem that I don’t know how to fix. I expect that there are 
logic probes made for SMDs but I have none of those either. 
 I will get a new 12V source after Xmas and have a careful poke. If anyone 
knows of a source of cheap(ish) isolated probes (or removable tips) or a 
convenient work around, I would appreciate the help. 
Happy holidays to all,
Mike

> -Ryan Stasel
> 
>> On Dec 21, 2014, at 23:07 , ed breya  wrote:
>> 
>> One thing I want to clarify - it is not a Jupiter GPS module - it just uses 
>> the chipset, presumably hooked up as in the application info. The board is 
>> proprietary, and there seems to be no standard electrical or operational 
>> interface as would be expected in an OEM GPS module. So, the only way to 
>> figure it out is to go by the chip details to see how it's supposed to work.
>> 
>> previous message:
>> 
>> I peeled open the shield can without too much deformation, so it can be 
>> restored. I found that it's a single board, with the DSP on one side, and 
>> the RF section on the other. It is a Rockwell chipset, with 11577-11 DSP, 
>> and 6732-13 RF. On searching I found that this seems to be called their 
>> Jupiter GPS from circa late 1990s - I found quite a lot of info at the 
>> module level, but not for the actual ICs, like pinout data. The set includes 
>> all the usual GPS stuff including 1 PPS, and is capable of several levels of 
>> on-ness. So, if the uP that makes it a DeLorme merely sets some control 
>> lines to activate it, then I should be able to override them to force it 
>> always on - if I can figure them out. If instead the uP programs something 
>> internal to the DSP to control power states, then fuggetabout it - it will 
>> be junk.
>> 
>> So, does anyone know of the Jupiter chipset, and where to find chip-level 
>> info for these parts?
>> 
>> Ed
>> 
>> ___
>> time-nuts mailing list -- time-nuts@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@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@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] DeLorme Tripmate GPS receiver

[Ryan Stasel]

Ed, 

Not 100% sure this is the same model, but it would seem to indicate there's a 
PPS signal on the DCD pin (from the gpsd-users list circa 2007): 
http://marc.info/?l=gpsd-users&m=118340900010559&w=2

Have a 'scope to check what that pin looks like?

-Ryan Stasel

> On Dec 21, 2014, at 23:07 , ed breya  wrote:
> 
> One thing I want to clarify - it is not a Jupiter GPS module - it just uses 
> the chipset, presumably hooked up as in the application info. The board is 
> proprietary, and there seems to be no standard electrical or operational 
> interface as would be expected in an OEM GPS module. So, the only way to 
> figure it out is to go by the chip details to see how it's supposed to work.
> 
> previous message:
> 
> I peeled open the shield can without too much deformation, so it can be 
> restored. I found that it's a single board, with the DSP on one side, and the 
> RF section on the other. It is a Rockwell chipset, with 11577-11 DSP, and 
> 6732-13 RF. On searching I found that this seems to be called their Jupiter 
> GPS from circa late 1990s - I found quite a lot of info at the module level, 
> but not for the actual ICs, like pinout data. The set includes all the usual 
> GPS stuff including 1 PPS, and is capable of several levels of on-ness. So, 
> if the uP that makes it a DeLorme merely sets some control lines to activate 
> it, then I should be able to override them to force it always on - if I can 
> figure them out. If instead the uP programs something internal to the DSP to 
> control power states, then fuggetabout it - it will be junk.
> 
> So, does anyone know of the Jupiter chipset, and where to find chip-level 
> info for these parts?
> 
> Ed
> 
> ___
> time-nuts mailing list -- time-nuts@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@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] DeLorme Tripmate GPS receiver

[ed breya]

One thing I want to clarify - it is not a Jupiter GPS module - it 
just uses the chipset, presumably hooked up as in the application 
info. The board is proprietary, and there seems to be no standard 
electrical or operational interface as would be expected in an OEM 
GPS module. So, the only way to figure it out is to go by the chip 
details to see how it's supposed to work.


previous message:

I peeled open the shield can without too much deformation, so it can 
be restored. I found that it's a single board, with the DSP on one 
side, and the RF section on the other. It is a Rockwell chipset, with 
11577-11 DSP, and 6732-13 RF. On searching I found that this seems to 
be called their Jupiter GPS from circa late 1990s - I found quite a 
lot of info at the module level, but not for the actual ICs, like 
pinout data. The set includes all the usual GPS stuff including 1 
PPS, and is capable of several levels of on-ness. So, if the uP that 
makes it a DeLorme merely sets some control lines to activate it, 
then I should be able to override them to force it always on - if I 
can figure them out. If instead the uP programs something internal to 
the DSP to control power states, then fuggetabout it - it will be junk.


So, does anyone know of the Jupiter chipset, and where to find 
chip-level info for these parts?


Ed

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

Re: [time-nuts] DeLorme Tripmate GPS receiver

[ed breya]

I peeled open the shield can without too much deformation, so it can 
be restored. I found that it's a single board, with the DSP on one 
side, and the RF section on the other. It is a Rockwell chipset, with 
11577-11 DSP, and 6732-13 RF. On searching I found that this seems to 
be called their Jupiter GPS from circa late 1990s - I found quite a 
lot of info at the module level, but not for the actual ICs, like 
pinout data. The set includes all the usual GPS stuff including 1 
PPS, and is capable of several levels of on-ness. So, if the uP that 
makes it a DeLorme merely sets some control lines to activate it, 
then I should be able to override them to force it always on - if I 
can figure them out. If instead the uP programs something internal to 
the DSP to control power states, then fuggetabout it - it will be junk.


So, does anyone know of the Jupiter chipset, and where to find 
chip-level info for these parts?


Ed

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

Re: [time-nuts] DeLorme Tripmate GPS receiver

[ed breya]

I opened it up and found a 4 by AA cell battery holder for power, and 
a single module that looks pretty proprietary. One side of the module 
has a patch antenna, and the other has the brain. I assume there's an 
RF board in between, but cannot open it further without possible 
damage - the shielding can is soldered at the edges of the brain board.


Ed

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

[time-nuts] DeLorme Tripmate GPS receiver

[ed breya]

I just picked up an old DeLorme Tripmate GPS receiver for cheap, and 
am wondering if it can be used for getting a 1 PPS signal. I looked 
online a little and found it's pretty common, but didn't see anything 
about getting deep into the guts. Most hacks seemed to be about 
getting it powered up, fooling it into starting up (apparently the 
character string "ASTRAL" has to be sent to it), and running to 
output navigational info (NMEA). The interface is a DB-9 serial 
connector that I suppose went to a PC and nav software. I don't care 
about that, and I don't want to even talk to it - just whether it can 
be fired up and automatically running with an internal mod, to get a 
1 PPS out, without "ASTRAL" or anything else.


Does anyone know or have info about this aspect, or info about the 
guts - block diagrams, sub-modules, documents, schematics, etc? I 
haven't opened it up yet, but will soon see what's in there.


Ed

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