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bemasher committed Aug 30, 2014
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Expand Up @@ -66,7 +66,7 @@ $ rtlamr
If you want to run the spectrum server on a different machine than the receiver you'll want to specify an address to listen on that is accessible from the machine `rtlamr` will run on with the `-a` option for `rtl_tcp` with an address accessible by the system running the receiver.

### Messages
Currently both SCM (Standard Consumption Message) and IDM (Interval Data Message) packets can be decoded but are mutually exclusive, you cannot receive both simultaneously. See (Wikipedia: Encoder Receiver Transmitter)[http://en.wikipedia.org/wiki/Encoder_receiver_transmitter] for more details on packet structure.
Currently both SCM (Standard Consumption Message) and IDM (Interval Data Message) packets can be decoded but are mutually exclusive, you cannot receive both simultaneously. See [Wikipedia: Encoder Receiver Transmitter](http://en.wikipedia.org/wiki/Encoder_receiver_transmitter) for more details on packet structure.

### Sensitivity
Using a NooElec NESDR Nano R820T with the provided antenna, I can reliably receive standard consumption messages from ~250 different meters and intermittently from another 400 meters. These figures are calculated from messages received during a 25 minute window where the preamble had no bit errors and no errors were detected or corrected using the checksum. Reliably in this case means receiving at least 10 of the expected 12 messages and intermittently means 3-9 messages.
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