Walkie Talkie 5w
Posted on Thursday, December 2, 2010 in Walkie Talkies
Walkie Talkie 5w
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Can I calculate a 5mile walkie talkie recieve sensitivity?
If a UHF walkie talkie set claims to have a maximum of 5 mile (about 8.05kM)reception, can you calculate the walkie talkie's reciever sensitivity if the power and transmit frequency is known at 0.5 watts & 462Mhz?
I calculated free space loss dB with equation: 20*log(8.05km)+20*log(462Mhz)+32.44 = 104dB FPSL @ 5miles.
So if transmitter = 0.5Watts = 27dBm, and 27dBm-104 = -77dBm at reciever 5miles away. I can assume the reciever sensitivity is -77dBm? I'm basically trying to find in general what mkes my 0.5w
No, this would assume that there are no obstacles in the path and no mulitpath reflections.
If you could this is what you'd calculate
-77 dBm is a power of 2x 10^-11 watts
This is across a 50 ohm load
V^2 = 1x 10^-9 volts ^2
V = 32 micro volts
I'm sure the receiver sensitivity is better than that by at least an order of magnitude. I found a walkie talkie with 0.2 micro volt sensitivity on the internet that sells for 50 dollars.
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