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RF transceiver chipset with low BER

That will just amplify the noise too (and probably make you more susceptible to intermod etc.)

The 10^-3 BER comes out in certain conditions. Increase power, decrease loss (e.g. move receiver closer to transmitter), lower noise, or lower your data rate and you get much better BER's. Shannon's law.

Note that your real BER will be very different than the advertised one because you're using it in a non-lab environment.

Tim.

Reply to
Tim Shoppa
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The BER is going to be directly proportional to the S+N/N ratio. That will be determined by the received signal strength, although different modulation techniques will give a different curve of BER vs. Rx signal absolute strength.

You should note in the data sheets that the BER listed (for a typical device from Microchip,

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) is at a specific sensitivity. For instance, it states that the BER shall be

Reply to
PeteS

Radiometrix made ones with BER of 1 ppm! anyone know what chipset they use?

(Note: I am not an RF expert)

The app note at [

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] seems to indicate that a good SNR is the key to getting the BER down. Do you have reason to believe that the transceiver chipset adding noise at low input levels is a problem? If so, it would seem that a good preamp would help. If, on the other hand, the problem is too much RF noise in your band, it would seem that a preamp would simply amplify the signal and the noise.

Have you considered using error correction? Look at the CRC at [

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]...

I am sure that the real RF experts will have better suggestions.

--
Guy Macon
Reply to
Guy Macon

I currently think of building a low power RF modem (433Mhz) + datalogger to collect some data. I have look around at different RF transceiver chipset manufacturers (chipcon, atmel, analogue device,microchip,mircel ect) and they are all pretty much have a BER of 10^-3. Is possible to reduce the BER by adding external components e.g. preamplifier on the RX pin?

Radiometrix made ones with BER of 1 ppm! anyone know what chipset they use?

thanks

John

Reply to
john smith

Think you misunderstand the spec. the usual specification for sensitivity is the input level to the reciever that gives you a BER of 10^-3

you can get pretty much any BER you like, it is just a matter of how high the input levet is ...

So you are comparing apples and oranges ...

it may have a BER of 1 ppm at and input level of -80dBm, and a BER of 100ppm at

-100dBm it is different measurements and can directly be compared

-Lasse

Reply to
Lasse Langwadt Christensen

cannot be be directly compared ...

Reply to
Lasse Langwadt Christensen

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