a monitor for 433,92 MHz

[This question has been answered, the solution can be found in the comments.]

[This question has been answered, the solution can be found in the comments.]

There are a lot of commercial very low priced remote controls. They mostly use the free 433,92 Mhz in the ISM band. If you decide to use one of these controls, it should be nice to measure first how busy this frequency is in your place. Too much interference from other users will degradete the maximum useable distance for your remote control. My proposel is to develop a small receiver just for this band with a kind of S-meter and some monitor function to get an impression through the day.

Discussion (1 comment)

NECV20 11 years ago

... it is allways clever to have a look around on the internet.

The following might be very, very helpful to you;

www.controller-designs.de and on the site browse to [Projecte] and select [RFM12_Scanner].

By the way, if you choose to use a RFM12, the signal strength can be derived from one side of the SMD C connection of C1 or C2. Look for old Elektor articles for the right connection point or look at the picture RFM12-shield-signalstrength.

And what you should find in the 433.92 Mhz is the transmissions of electronic car keys of european and japanese cars (as I found out myself).

rfm12-shield-signalstrength.jpg (353kb)

EN109637 10 years ago

I have made a similar project. I used a commercial thick film RX attached to a pic to use a a logic decoder of 433.92MHz sensors. I use it to hack weather instruments to use them for my own projects. Your project is very interesting.