Dash cam RFI on GPS signal

General chat about GPS technology

Moderator: Moderators

Message
Author
sbc
Newbie
Newbie
Posts: 16
Joined: Tue Aug 28, 2007 12:04 am
GPS: Garmin GPS60Cx, Nuvi 42LM, eTrex Touch 35
Location: Bt Batok West Ave 5
Contact:

Dash cam RFI on GPS signal

#1 Post by sbc » Wed Jul 20, 2016 2:51 pm

For the past year I was wondering why the GPS signal in my vehicle was so poor until I discovered that the RF from my dash cam is interfering with the GPS unit. Once I switched off the dash cam, GPS operation was back to normal.
So far I have tested a few Chinese-brand dash cam and they have varying effect on my Garmin Nuvi. Now I have a Garmin GDR C530, and it has zero interference with my Nuvi 42LM. I kind of expect that, since they are of the same brand; it just wouldn't be right for Garmin not to test its dash cameras with its own GPS devices.
Note that these are simple cameras - no wifi or Bluetooth.
Please feel free to post your experience with other brands of dash cam.
On a side note, I also noticed the reception for 88.3 JIA FM was poor, again because of those dash cam. Now that I have the Garmin camera, I can listen to that channel again!

User avatar
moeyHC
Valued Contributor
Valued Contributor
Posts: 1343
Joined: Sat Feb 11, 2006 12:00 am
GPS: Nuvi 300, 205W, 2575, Papaga N1, iGo, 5800, M1200, M1000B/C
Location: Penang
Contact:

Re: Dash cam RFI on GPS signal

#2 Post by moeyHC » Wed Jul 20, 2016 4:38 pm

Thanks for the highlighting this problem.

I'll check my 42LM to see if the accuracy is compromise. I do notice the recalculation on this model is very slow. BTW, the dash cam power supply may be the culprit as they are simple switcher regulated power supply and they do give out a lot of electrical noise. There is one I bought that causes snowy picture on my Nuvi2575 camera.

Will report back my findings.
MSM Glossary/Index - viewtopic.php?p=57986#p57986

sbc
Newbie
Newbie
Posts: 16
Joined: Tue Aug 28, 2007 12:04 am
GPS: Garmin GPS60Cx, Nuvi 42LM, eTrex Touch 35
Location: Bt Batok West Ave 5
Contact:

Re: Dash cam RFI on GPS signal

#3 Post by sbc » Thu Jul 21, 2016 11:47 am

Yes, some cheap 12V to 5V converters are extremely noisy. I have thrown those away. But in this latest development, I have tested all the dash cams with and without 12V supply, i.e. with internal battery only. I can confirm the RFI is coming from the camera itself.

I have also tested those dash cams with my etrex touch and Samsung phone. Both GPS signals are affected by the cameras. Again the Garmin dash cam is the only one I have that does not interfere.

User avatar
moeyHC
Valued Contributor
Valued Contributor
Posts: 1343
Joined: Sat Feb 11, 2006 12:00 am
GPS: Nuvi 300, 205W, 2575, Papaga N1, iGo, 5800, M1200, M1000B/C
Location: Penang
Contact:

Re: Dash cam RFI on GPS signal

#4 Post by moeyHC » Fri Jul 22, 2016 8:32 am

My Nuvi 2575LM, Mi3 phone and Papago N1 are not affected at all by my DVR. The accuracy shown is 3 meters for the 2575. Have yet to test on the 42LM.
MSM Glossary/Index - viewtopic.php?p=57986#p57986

User avatar
moeyHC
Valued Contributor
Valued Contributor
Posts: 1343
Joined: Sat Feb 11, 2006 12:00 am
GPS: Nuvi 300, 205W, 2575, Papaga N1, iGo, 5800, M1200, M1000B/C
Location: Penang
Contact:

Re: Dash cam RFI on GPS signal

#5 Post by moeyHC » Fri Jul 22, 2016 12:26 pm

Verified the Nuvi 42LM is good with accuracy around 4 to 5 meters. Recalculation still as slow with DVR off.
MSM Glossary/Index - viewtopic.php?p=57986#p57986

sbc
Newbie
Newbie
Posts: 16
Joined: Tue Aug 28, 2007 12:04 am
GPS: Garmin GPS60Cx, Nuvi 42LM, eTrex Touch 35
Location: Bt Batok West Ave 5
Contact:

Re: Dash cam RFI on GPS signal

#6 Post by sbc » Thu Jul 28, 2016 7:08 pm

What is the brand of your DVR?

User avatar
moeyHC
Valued Contributor
Valued Contributor
Posts: 1343
Joined: Sat Feb 11, 2006 12:00 am
GPS: Nuvi 300, 205W, 2575, Papaga N1, iGo, 5800, M1200, M1000B/C
Location: Penang
Contact:

Re: Dash cam RFI on GPS signal

#7 Post by moeyHC » Thu Jul 28, 2016 10:04 pm

I bought mine from Lazada.

http://www.lazada.com.my/23-tft-fhd-108 ... 31647.html

This model is good but I have bad experience with its quality. I bought 5 units but, needs to return 3 times as DOA. Even now I have one unit that constantly looses time.
MSM Glossary/Index - viewtopic.php?p=57986#p57986

User avatar
bartmp8
Senior Mapper
Posts: 3062
Joined: Fri Aug 10, 2007 5:35 pm
GPS: GPSV(r),10X+PDA(r),Nuvi200(r),VistaHCx, 60CSx, Nuvi765(r),Oregon550 & Nuvi3790 (from Redstorm)
Location: Sandakan
Contact:

Re: Dash cam RFI on GPS signal

#8 Post by bartmp8 » Fri Jul 29, 2016 9:41 am

Don't forget some window tinting like V-Cool (those with metallic coatings) will reduce GPS signal.

User avatar
moeyHC
Valued Contributor
Valued Contributor
Posts: 1343
Joined: Sat Feb 11, 2006 12:00 am
GPS: Nuvi 300, 205W, 2575, Papaga N1, iGo, 5800, M1200, M1000B/C
Location: Penang
Contact:

Re: Dash cam RFI on GPS signal

#9 Post by moeyHC » Mon Aug 01, 2016 9:58 am

That's true if the tint is metallic based. His problem is more towards the DVR emission of "Noise" (EMI/RFI) that interfere with the GPS reception. Once the DVR is off the problem went away.
MSM Glossary/Index - viewtopic.php?p=57986#p57986

User avatar
SilverBeauty
MSM Global Moderator
MSM Global Moderator
Posts: 4924
Joined: Fri Aug 10, 2007 9:54 pm
GPS: Garmin Nüvi 1350, 3790T
Fenix
eTrex HcX
Pioneer AVH-P8450BT
Samsung Note3
Apple iPad2
Location: Sin-Ka-Pu-Ra
Contact:

Re: Dash cam RFI on GPS signal

#10 Post by SilverBeauty » Mon Aug 01, 2016 11:48 am

Suggest buying a suitable size RF Sheld bag. Cut a slot for lens to see through. Cheap solution :mrgreen:
Attachments
Shielding-Pouches.jpg

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests