Raytheon R10X and GPS connection Problem

[TSB240]

I am currently trying to get the Radar to display LL and Way points on the screen.

It is an old radar and needs a Loran -C GPS sentence $GPRMA and $GPRMB so it can operate correctly.
It will not work correctly off most modern GPS which only seem to provide the $GPRMC sentence.

As far as I can see the $GPRMC sentence has all the data required but is not in the same order as the Loran sentence.

Has anyone found a smart GPS antenna that outputs $GPRMA and $GPRMB sentences as an option?

The only other route I can find to solve the problem is to use a program like Navmonpc and my PC rather than a direct connection.

This could take the $GPRMC sentence in and send it via the server/client facility to a separate programme on the pc This would then generate the $GPRMA sentence by repositioning the info from a $GPRMC sentence.
It can then be used by Navmon PC and sent out to the radar.

Heres hoping someone has the answer?

Steve

 

[philip_stevens]

I have the same radar, and had the same problem!

All I could display when connected to my Navman GPS/Plotter, was ??? marks. I also have an AP-Philips Gps Mk6, so connected that and got the correct display on the radar, with L selected.

As you say, it is to do with the sentence output from the newer Navman compared to the older AP-Philips. The older AP-P probably using the same output as a Loran.

Both Navman and the AP-P use NMEA 0183, but I do not know what the difference is between the output of them. One works, the other doesn't!

Maybe the answer could be to get an older GPS and use that to feed the radar - as I have.

 

[AngusMcDoon]

I am currently trying to get the Radar to display LL and Way points on the screen.

It is an old radar and needs a Loran -C GPS sentence $GPRMA and $GPRMB so it can operate correctly.
It will not work correctly off most modern GPS which only seem to provide the $GPRMC sentence.

As far as I can see the $GPRMC sentence has all the data required but is not in the same order as the Loran sentence.

Has anyone found a smart GPS antenna that outputs $GPRMA and $GPRMB sentences as an option?

The only other route I can find to solve the problem is to use a program like Navmonpc and my PC rather than a direct connection.

This could take the $GPRMC sentence in and send it via the server/client facility to a separate programme on the pc This would then generate the $GPRMA sentence by repositioning the info from a $GPRMC sentence.
It can then be used by Navmon PC and sent out to the radar.

Heres hoping someone has the answer?

Steve

According to here...

http://gpsd.berlios.de/NMEA.txt

RMC has the lat/long/COG/SOG information you need in your RMA but not the waypoint stuff you need in RMB. This waypoint stuff is only going to come out of some sort of chartplotter or handheld GPS where you can put routes in, not a smart GPS antenna.

It would be pretty simple to modify the code in the YAPP multiplexer to translate an RMC to an RMA, but you still need to get the waypoint information from somewhere. How's you C?

 

[AngusMcDoon]

Buy an older Garmin - the 126, 128, 152, etc - which all output RMB.

But do they do RMA? I would guess not as they are GPS devices rather than Loran-C.

 

[TSB240]

I have the same radar, and had the same problem!

All I could display when connected to my Navman GPS/Plotter, was ??? marks. I also have an AP-Philips Gps Mk6, so connected that and got the correct display on the radar, with L selected.

As you say, it is to do with the sentence output from the newer Navman compared to the older AP-Philips. The older AP-P probably using the same output as a Loran.

Both Navman and the AP-P use NMEA 0183, but I do not know what the difference is between the output of them. One works, the other doesn't!

Maybe the answer could be to get an older GPS and use that to feed the radar - as I have.

But do they do RMA? I would guess not as they are GPS devices rather than Loran-C.

I don't think I will bother with the old gps route. It is bad enough relying on an antique radar!

Navmonpc will generate a $GPRMB sentence on the PC.

I can RENTAGEEK to do some programming. I supported him through university! I am too old and lazy to learn C. I started with Algol at school......

Thanks for the info.

Steve

 

[philip_stevens]

I already had the older AP-P and fitted it as a back-up position GPS.

I think it is worth getting an older GPS as a back-up. Plenty around and cheap.

 

[TSB240]

Just an update and for anyones interest.

I now have a little program that was put together by my son that takes any RMC sentence on a nominated receive port on a PC and converts it to an RMA sentence on another nominated transmit port on the same PC.

In my case I am using this with the NMEA routing facility on Navmonpc to take the RMC signal from my primary GPS source and route the converted RMA and the redirected RMB signal from my plotter to provide the necessary signals to the Raytheon Radar.

If this might help anybody out in the future please PM me for a copy of the software.

Steve