Preisvergleich für Fob-tester in Deutschland bei Shoppdeal.de in November 18, 2019
Using a RTL-SDR connect to a smartphone we can use SDRoid APP to check if a key fob of a car in this case is transmitting the RF signal. The key fob works on 434Mhz frequency, we can see on the waterfall the RF signals.
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Using a key fob testing tool to determine the strength of the the signal being transmitted. This will help you determine whether replacing the battery in the fob will make a difference or not.