Re: Distance


Posted by jb on February 06, 2001 at 12:16:03:

In Reply to: Distance posted by brian on January 30, 2001 at 21:28:16:

A reasonable receive signal level is -107 dBm. A typical transmitter is say +50 dBm (100W ERP). The difference is 157 dBm between the two. Now calculate the free space loss with this formula.

39.6 + 20(log) frequency in MHz + 20(log) distance in miles

Subract the result from the +50 dBm ERP and if it's still greater than -107 dBm you should hear it. What's not figured into the formula are the obstruction losses and NexTel(or other)desense values. Your on your own to figure those.

Go Radio!



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