Help with interference affecting my keyless entry FOB

[Ubbe]

They probably make that on purpose, to have it respond to unluck much easier than lock, for obvious reasons.

The receivers they tend to use are of terrible quality. They get overloaded and blocked from a signal that need not to be even near in frequency. A solution would be to wrap the cars receiver antenna in aluminum foil to have it work only next to the car and not from long distancies, which is unneccesary anyway.

/Ubbe

 

[jpapos]

Well thanks to slicerwizard I tracked down the issue with the Dongle and SDR#. It ended up being a rain gauge meter that got water inside the house and was transmitting that peak. It took me about 15min but I found it!

Now that I am hooked on SDR if I wanted a better device what is a reasonably priced decent dongle and then what dongle allows for transmission that is also reasonably priced.

Thanks T

 

[RFI-EMI-GUY]

See my last comment above about WX station!

Well thanks to slicerwizard I tracked down the issue with the Dongle and SDR#. It ended up being a rain gauge meter that got water inside the house and was transmitting that peak. It took me about 15min but I found it!

Now that I am hooked on SDR if I wanted a better device what is a reasonably priced decent dongle and then what dongle allows for transmission that is also reasonably priced.

Thanks T

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[majoco]

A solution would be to wrap the cars receiver antenna

.....but where is the antenna? My guess is somewhere around the drivers door under the plastic of the glareshield given by my trials - it may only be a bit of wire about 6inches long for the 432MHz band. As long as you know how and why then it can be worked but sometimes it's really frustrating!

 

[Ubbe]

Try to locate some drawings of the electrics from the car manufactures web pages. It's usually easy to find some pictures or drawings where all the electronic gadgets are placed in the car.

https://www.benzworld.org/forums/w211-e-class/2513673-wheres-rf-receiver-remote-key.html
https://www.youtube.com/watch?v=rdXzL7S5lmc
https://www.youtube.com/watch?v=_gdtlp5hHZA

/Ubbe

 

[KE5MC]

...snip...

Now that I am hooked on SDR if I wanted a better device what is a reasonably priced decent dongle and then what dongle allows for transmission that is also reasonably priced.

Thanks T

I can't talk to the transmit part. While different hardware and software can be mixed I believe you get the most out of a combination intended to work together. In this case SDR# and Airspy-mini. I use the Airspy-R2 which might be out of your price consideration. The mini can be had for $99 plus tax and shipping.

I linked to another page for the RTL-SDR product. I've read good review, but it seems in short supply sometime. That URL is also a good source for all things SDR, dongle-wise.

Good Luck,
Mike

P.S. Nice job tracking the problem down. They can be a bear to find sometime.

https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/

 

[rfradioconsult]

433 MHz is most likely your TPMS the transmitters for your tire pressure monitoring system, you have one inside each of your tires. A large tire store should have a scanner that can verify that the transmitters are functioning.

 

[slicerwizard]

Tire pressure sensors are not going to transmit continuously. It's not them.

 

[Ubbe]

The tire preassure transmitters only send an extreamly short burst that you probably will need to have the squelch open on a scanner to try and hear and it's also easy to confuse the datasignal with white noise.

I have a couple of the SDR-RTL dongles and they are excellent products that do not drift in frequency like other cheap dongles do and they also have a metal enclosure and a proper SMA antenna connector of the same type as Unidens portable scanners.

/Ubbe

 

[RFI-EMI-GUY]

See post #22. The OP found it, it was a weather station rain guage. Note I suggested a few posts above at #19 that it might be a weather station thermometer.

These like a TPMS, are Part 15 ISM devices that normally have a very short duty cycle. In the case of the rain gauge, it probably got wet. No surprise. ISM devices can fail. I am sure that amongst the millions made, there is a TPMS out there that hit a curb and is now jamming car fobs at Wal-Mart, ,

This stuff happens.

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