RC M GPS signal acquisition time (slow)

isakhnov

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Had my car back for couple of days after after the RC M install and am observing very slow GPS signal acquisition time of five + minutes. Yesterday it failed to acquire it completely on the trip from work to my daughters event with about fifteen minutes of drive time but happily picked it up shortly after car was started again. Antenna is located behind the front bumper. Any thoughts on what could be wrong?
 

LuckyXII

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I have mine located right on the windshield with a clear view of the sky and it also takes a long time to connect.

On my ALP it connects within 30 seconds and the ALP GPS is located about 6 inches beside the RCM GPS, so I’m thinking it’s a RCM thing.
 
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Jon at Radenso

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Is this every time you start the car or occasionally? It should never take 15min to acquire signal.
 

LuckyXII

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On mine, it ranges between 1-4 minutes depending on how long the car has been sitting for. For comparison purposes only, the ALP typically gets signal within 30 seconds.

GPS location attached.
 

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isakhnov

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@Jon at Radenso - really happy to hear that it is not normal. 15 minutes was a one off, other cases were around 5 minutes. What can I do to troubleshoot? @CLM Systems Unlimited can provide all of the details on the install.
 

Heywood

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Both of my GPS antennas are on the dash besides the passenger “A” Pilar.

There might be a slight delay of 5 minute, at the most, on the very first power up of the day, but after that initial GPS lock on, the rest are instantaneous for the day.

Never heard if anyone putting the GPS antenna behind a bumper? I’m not sure they should be out in the elements?

Could it be something to do with metallic paint?
 
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MikePA

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Both of my GPS antennas are on the dash besides the passenger “A” Pilar...Never heard if anyone putting the GPS antenna behind a bumper? I’m not sure they should be out in the elements?
Every aftermarket device I've installed (or had installed) which used GPS had the antenna on top of the dash at the intersection with the windshield so it had a clear view of the sky. IMO, the GPS antenna was installed in the wrong place.

Here are the instructions from Page 5 of the RC M Installation Guide;

  1. The GPS antenna requires a clear view of the sky to work ideally, but it can also be mounted behind plastic such as the underside of the top of the dashboard. Other locations include on top of the dashboard with 3M tape, on the back of the rear deck lid, or magnetically mounted on the roof.
 

steve

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My RCM is extremely slow to acquire as well. Not sure why. Sits right next to ALP GPS which acquires almost immediately.

Slightly frustrating. I don’t know much about GPS, but seems like it should store coordinates when car is turned off to assist in acquiring signal, ie when signal is locked and you go into store and come back out 20 min later, it shouldn’t take 10 min to acquire again.
 

isakhnov

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@Heywood - it's a bit hard to accept 5+ minutes start up when the rest of the electronics (including always slow to pick up tech Canon DSLRs) pick it up in seconds.

@MikePA - this is how it was installed. It is right at the front behind the MB star, see image. Happy to move if location is the problem.
Resized_2(3).jpg
 

Heywood

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@Heywood - it's a bit hard to accept 5+ minutes start up when the rest of the electronics (including always slow to pick up tech Canon DSLRs) pick it up in seconds.
Yes and no. A lot of time I attribute my initial GPS delay on my location. Im pretty far North. 51° latitude.

I use my AutoStart everyday, so I don’t notice it as much as someone who doesn’t so I have to take that into consideration.

That’s a beautiful install on a beautiful car. MB does a lot of things differently and different types of paint.

Was the antenna put there because of the metallic windshield tint?

Still, others have reported slow connections even without metallic paint and metallic windshield tint. It could come down to the type of GPS antenna they are using directly from the manufacture of the RC-M.

I had no idea there were so many different types of GPS antennas to choose from until I watched Radenso’s latest video on the Theia motherboard video.
 

isakhnov

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MB windshield coating makes it next to impossible to have anything mounted behind it, my old max 360 was effectively of no use.
 

isakhnov

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@barry - I do not think so.

Timed it today - two trips of 25 and 26 minutes respectively and signal was not acquired both times at all. Clearly not working as expected.
 

isakhnov

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Update from today

Morning on the way to work - acquired the signal right at about 5 minutes mark.

Evening - both 15 and 25 minute trips with no signal acquisition.

@Jon at Radenso - what is the expected acquisition time for RC M?
 

MikePA

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@Jon at Radenso - what is the expected acquisition time for RC M?
Acquisition time should be less than 5 minutes. As a test, is it possible to temporarily move the GPS antenna to a location which has an unobstructed view of the sky, even if it means just laying it on the hood and backing out of the garage?
 

isakhnov

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@MikePA - yes, Charles and I are setting up the time to move the antenna for a test (non trivial as it sits behind the front bumper).
 

Jon at Radenso

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I will work with Charles to make sure he has a spare GPS antenna in stock just in case it turns out to be a bad antenna.

One suggestion - maybe try separating the two GPS antennas by a few more inches? It may be possible they are interfering with each other being less than 1 inch apart.

The cable of the GPS antenna on the Radenso is an analogue RF cable - gain will be affected by distance, as well as tight bends where it is kinked. I would definitely check and see if the cable is kinked or zip tied too heavily somewhere - that would cause a definite reduction in signal.
 

steve

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Update from today

Morning on the way to work - acquired the signal right at about 5 minutes mark.

Evening - both 15 and 25 minute trips with no signal acquisition.

@Jon at Radenso - what is the expected acquisition time for RC M?
Out of curiosity, do you turn your car on in a garage? I’ve noticed the past few times if I start my car outside it acquires a lock. It’s almost if it doesn’t lock immediately it stops attempts to lock gps.
 

isakhnov

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Out of curiosity, do you turn your car on in a garage? I’ve noticed the past few times if I start my car outside it acquires a lock. It’s almost if it doesn’t lock immediately it stops attempts to lock gps.
Yep, start in a garage (both home and work)
 

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