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Best transmitter for distance

Micheal Singleton
Intellectual 540 points

Hi guys,

I am familiar with the CC430.  I used it on a DASH7 platform (433MHz) but was only able to get 100 meter distance.  I would like to increase that to the guaranteed 1 Km  or more.  What chip set is recommended for maximum distance.

Also I read where Europe was able to use 20dB more power in this range.  That's a factor of 10 which would increase my distance to 1 Km.  Is this true?  Am I limited in distance due to american regulation?

Mike

  • 0
    TI__Guru**** 317180 points
    For range, sensitivity, output power and datarate are the most important factors.

    For range, select a low datarate and a frequency band where you can send maximum output power (915 MHz)

    Output power is set by the following for 433 MHz:

    15.231(a) is for simple control signal, like an alarm system, door opener, or a remote switch. @433 MHz the output power is -14.4 + 20*log(100 ms/TX_on_time) [max 5.6 dBm], where TX_on_time is the maximum transmission time in any 100 ms period.

    For applications that do not meet the restrictions of 15.231(a), lower transmit signal levels are given in 15.231(e). @433 MHz the output power is -22.4 + 20*log(TX_on_time/100ms) [max -2.4 dBm], where TX_on_time is the maximum transmission time in any 100 ms period. According to 15.231(e) the duration of one transmission shall be shorter than 1 second and the off time between transmission shall be at least 30 times the duration of the transmission or 10 seconds, whichever is greater. Example: If the transmission time is 10 ms (or less) the output power @433 MHz is -2.4 dBm and you can have 6 transmission per minute.