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post #1 of (permalink) Old 8th October 2007 Thread Starter
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Handsfree keycard analysis with a Spectrum Analyzer

I have a 3 button keycard. First button is manuel door open button, second is manuel door lock button and the third one ("LOCK+AUTO" labeled) is handsfree door open and lock button.

My card is not working at handsfree mode. So i think the keycard can cause this problem and i analyzed keycard RF signals with a spectrum analyzer.

When i push the lock and open buttons a 430 Mhz signal was transmitted from the keycard. It is normal.

But i hope that if i push and release the "LOCK+AUTO" button, i will see a continuous signal transmitted from the card even if i release the button. But i didnt see anything after i release the "LOCK+AUTO" button. there was not a continuous signal transmitted from my keycard.

Is it normal? Maybe that is my problem.

I wish another person analys his card while it is in handsfree mode with a spectrum analyzer. Thus i can understand it is the card fault or car fault.

Really must there a continious signal while it was in handfree mode? What is your opinions?

Last edited by lagunaaramis; 8th October 2007 at 07:58 AM.
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