PhilHornby
Senior Member
I know that not all 433MHz RF Receivers are created equal, so when I needed one for my latest project, I made sure I chose a Superhet version, over a TRF design. One of the first ones I found on eBay, was a Hope RFM210LCF-433D-A. Being branded and reasonably priced, this is the one I chose.
However, it soon became apparent that the performance of this device, is much better than the previous designs I have encountered.
Here is a comparison against another model, showing signal output in the absence of a received signal. The other model spits out all manner of noise, which is the accepted behaviour for these devices. However, the Hope doesn't do this - its output sits HIGH, with just a sporadic blip every 25mS or so :-
Upon receipt of data, its performance is impressive. This trace shows it intercepting the signal from an Imagintronix Temperature Sensor; it even successfully captured all 8 bits of the (throwaway) 'synchronising preamble' from the sensor. Note the data is delayed by some 200~400 µS compared with the other Receiver.
However, it soon became apparent that the performance of this device, is much better than the previous designs I have encountered.
Here is a comparison against another model, showing signal output in the absence of a received signal. The other model spits out all manner of noise, which is the accepted behaviour for these devices. However, the Hope doesn't do this - its output sits HIGH, with just a sporadic blip every 25mS or so :-
Upon receipt of data, its performance is impressive. This trace shows it intercepting the signal from an Imagintronix Temperature Sensor; it even successfully captured all 8 bits of the (throwaway) 'synchronising preamble' from the sensor. Note the data is delayed by some 200~400 µS compared with the other Receiver.
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