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jsuresh kumar
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Join Date: Jul 2008
Posts: 13

communication

05/01/2009 4:11 AM

Hello everybody,

Please i need information regarding walki talki/radio .How do you find out the range -distance it can communicate between two radio , the specification mentions 144 to 148 MHZ.

thanks suresh
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: communication

05/01/2009 5:17 AM

144.0 - 146.0 MHz is the Amateur Radio VHF band, which is highly structured and controlled. Depending upon antenna design at both the transmitter and the receiver, crossing half of Europe is possible under good conditions within the maximum output power licensed for use in this band.

Permissible transmission methods in this band include

  • carrier-wave morse code
  • upper sideband
  • narrow-audio frequency modulation

145.0-146.0 MHz is restricted to narrow-audio frequency modulation in 25kHz channels.

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Vulcan
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Philippines - Member - New Member Engineering Fields - Instrumentation Engineering - New Member Engineering Fields - Control Engineering - Who am I?

Join Date: Oct 2006
Location: Northern Mindanao, Philippines
Posts: 2147
Good Answers: 53
#2

Re: communication

05/01/2009 6:24 AM

For simplicity, power, not frequency, will enable you to get a rough estimation of range. Affecting this would be the height of the antenna, the surroundings (are you in a valley or top of a mountain for instance), your battery's state, and, of course, the overall quality of the unit.

regards,

Vulcan

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