RC M GPS lock difficulties

Vortex

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So I took a drive today running the RC M. I'm having difficulties with the detector getting a GPS lock. After a few min it will acquire the time from GPS, but even after 30 min of driving, it isn't able to display a speed or use any GPS-based features like lockouts. I've tried reseating the GPS cable in the CPU a few times, but no luck. Any idea why it'd be able to get the time, but not display speed? It's almost like it can acquire one or two satellites, but not enough for a full GPS lock or something.

On another note, it's nice seeing how well it can filter out BSM's. :)
 

MDO34

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My Pro M struggles to GPS lock in a timely manner about one third of the time as well. And yes, I do have the latest firmware
 

dchemist

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So I took a drive today running the RC M. I'm having difficulties with the detector getting a GPS lock. After a few min it will acquire the time from GPS, but even after 30 min of driving, it isn't able to display a speed or use any GPS-based features like lockouts. I've tried reseating the GPS cable in the CPU a few times, but no luck. Any idea why it'd be able to get the time, but not display speed? It's almost like it can acquire one or two satellites, but not enough for a full GPS lock or something.

On another note, it's nice seeing how well it can filter out BSM's. :)
From my understanding, the RC-M uses just a GPS antenna. That being the case, I would double check your cable really well and see if there isn't a kink, abrasion, etc. somewhere in the cable that is affecting the ground. Usually the transition from the cable to the connector is where you start to see problems but that should have been apparent when you were disconnecting/reconnecting.
 

JagMan

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So I took a drive today running the RC M. I'm having difficulties with the detector getting a GPS lock. After a few min it will acquire the time from GPS, but even after 30 min of driving, it isn't able to display a speed or use any GPS-based features like lockouts. I've tried reseating the GPS cable in the CPU a few times, but no luck. Any idea why it'd be able to get the time, but not display speed? It's almost like it can acquire one or two satellites, but not enough for a full GPS lock or something.

On another note, it's nice seeing how well it can filter out BSM's. :)
Hi Vortex,
Does your new Audi have an athermic windshield? You may have good signals from the front, but from above at the headliner?
I think I would sent it in for repair, definitely not normal...
 
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Heywood

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I’ve only experienced a little longer GPS lock on at the beginning of the day. After it’s gotten that first one out of the day, it’s very quick after that.

I can’t think of a time when it’s list it’s lock on except found through a few drive through car washes.
 

Vortex

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Hi Vortex,
Does your new Audi have an athermic windshield? You may have good signals from the front, but from above at the headliner?
I think I would sent it in for repair, definitely not normal...
The GPS antenna is located in my vehicle's spoiler, alongside the antennas for the ALP, Stinger, and everything else. I think there's like 6 GPS antennas in there, lol. The RC M's GPS used to work a bit better for me, though it's always been a little bit flaky. I haven't had the same issues with the other GPS antennas.
 

Vortex

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Can you physically check the GPS antenna and let us know? We haven't had anyone report a issue like this.
Unfortunately I can't. It's tucked away in the spoiler and I don't have physical access. The only thing I have access to is the connector at the CPU.
 

Edward4

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The GPS antenna is located in my vehicle's spoiler, alongside the antennas for the ALP, Stinger, and everything else. I think there's like 6 GPS antennas in there, lol. The RC M's GPS used to work a bit better for me, though it's always been a little bit flaky. I haven't had the same issues with the other GPS antennas.
The GPS on my RC-M has been rock solid. It usually acquires GPS within 15 seconds of powering it up. It is located under the dashboard. I would suspect you have some kind of hardware/cable issue.
 

steve

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So I took a drive today running the RC M. I'm having difficulties with the detector getting a GPS lock. After a few min it will acquire the time from GPS, but even after 30 min of driving, it isn't able to display a speed or use any GPS-based features like lockouts. I've tried reseating the GPS cable in the CPU a few times, but no luck. Any idea why it'd be able to get the time, but not display speed? It's almost like it can acquire one or two satellites, but not enough for a full GPS lock or something.

On another note, it's nice seeing how well it can filter out BSM's. :)
You know... I noticed this EXACT issue too. Exactly the same...No idea why. I was going to upgrade firmware and see what it does.

Gets time (after about 10 min) but does not get speed. Seems to me this is a new issue but I drive with smart dark so can’t say for sure. I only noticed it when my lockouts weren’t working. The other day it did get speed after about 30 minutes. I’m in NYC with 5 story buildings around. Most drives are short.

I also noticed that during this time of weird GPS behavior the alerts do not auto mute.

I’m on the previous FW 13.
 
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angrypenguin

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Reboot the RCM. I had the issue yesterday and upon reboot I get an instant lock. Maybe FW related?
 

steve

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Reboot the RCM. I had the issue yesterday and upon reboot I get an instant lock. Maybe FW related?
When you say reboot... do you mean reset defaults? Or is there a different reboot than power cycling the car?

@Vortex how long have you noticed? Call me crazy but is it possible it happened during time change?
 

angrypenguin

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When you say reboot... do you mean reset defaults? Or is there a different reboot than power cycling the car?
Sorry, reboot to me means turn it off and turn it on again
 

LICayman

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I just did my own RCM install recently and I called up Radenso tech support to confirm the placement of the GPS. I wanted to stick it to my windshield (using bottom flat side of GPS) instead of my dash board. The said it was ok but then I asked about my ALP GPS placement too, I was told they should be a minimum of two inches apart. I was happy to know this before I mounted because they would have been installed side by side. Just sharing this info if its not already old news.....
 
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Vortex

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I know it's been a little while, but just a quick followup. I got my car back this week (yay!) and fired up the RC M. I was able to fix the GPS issue after unplugging and reseating the GPS antenna cable at the CPU. Now it locks properly again.

Maybe the connector is a little finicky, especially considering how much stuff I have back in that area? It'd be nice to have a locking or screw-on connector instead of a push-in connector, but fortunately a little finagling was able to do the trick.
 

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