Aaronia SPECTRAN HF-2025, Manual

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19.0 Conversion tables
64
Table 0 Conversion dBm to W/m² with HyperLOG antenna
Assuming the use of an idealized HyperLOG antenna with 5dBi gain and an idealized RG316U
cable of 1m length and a constant damping of 1dB, the following conversion table can be
applied to the signal sources below (all figures in W/m²):
dBm GSM900 GSM1800 UMTS WLan
+10 0,45 1,9 2,2 3,3
+9 0,36 1,5 1,8 2,7
+8 0,28 1,2 1,4 2,1
+7 0,23 0,95 1,1 1,7
+6 0,18 0,76 0,89 1,3
+5 0,14 0,60 0,70 1,06
+4 0,11 0,48 0,56 0,84
+3 0,09 0,38 0,44 0,67
+2 0,07 0,30 0,35 0,53
+1 0,06 0,24 0,28 0,42
0 0,045 0,019 0,022 0,033
-10 0,004 5 0,001 9 0,002 2 0,003 3
-20 0,000 45 0,000 19 0,000 22 0,000 33
-30 0,000 045 0,000 019 0,000 022 0,000 033
-40 0,000 004 5 0,000 001 9 0,000 002 2 0,000 003 3
-50 0,000 000 45 0,000 000 19 0,000 000 22 0,000 000 33
-60 0,000 000 045 0,000 000 019 0,000 000 022 0,000 000 033
We assume the following center frequencies (f):
GSM900 (f = 900MHz), GSM1800/DECT (f = 1850MHz), UMTS (f = 2000MHz) and WLan/micro-
wave ovens (f = 2450MHz).
The conversion table demonstrates a 10-fold reduction of power density with each 10dB step.
Likewise, the 1dB intermediate steps also express a constant ratio each. Consequently, this
table provides a straightforward way to quickly convert dBm figures into W/m².
Of course, this table can also be utilized in conjunction with other antennas, attenuators or cable
types:
For example, when using our 20dB
attenuator (option), you would refer to those rows in the
table which are 20dB higher - i.e. -10dBm instead of -30dBm.
Likewise, when using an antenna with 24dBi gain, you would use those values which are 19dB
below (24dBi - 5dBi [because the values are already pre-multiplied by 5dBi]). Example: -43dBm
instead of -24dBm.
When using a
cable with 5dB damping, you would use values 4dB higher (5dB - 1dB [because
the values are already pre-multiplied by 1dB]). Example: -24dBm instead of -28dBm.