Thread: Field Strength
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Old December 16th 03, 02:28 PM
Spajky
 
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On Sun, 14 Dec 2003 03:18:35 GMT, Active8
,invalid wrote:
Refresh my ram.


| E(uV/m) |
V (dBmV) = 20log | --------- / 1000 |
| 0.021f(MHz) |

plus correction for distance (regulations for limits are for
specific measuring distances), etc. I'll mull the above eq over.
Gotta figure out where the .021 came from, but not now.


I use simplified formula for practical life with also some antenna
mismatchings & soft obstacles in-calculated:

dBm = ~90dB x 1Mhz x 1km or better dBm = 100dB x 1Mhz x 1km
for having better Rx SINAD

since voltage on Rx antenna drops linearly with rising a frequency &
distance & vice-versa. From dBm´s got I just recalculate RX voltage on
RX input

simple & effective calculation IMHO ...





-- Regards, SPAJKY
& visit site - http://www.spajky.vze.com
Celly-III OC-ed,"Tualatin on BX-Slot1-MoBo!"
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