# Re: Just to be clear - eirp vs transmitter power

```Edward R. Cole wrote:
> For those who are dB challenged:
> 3 dB = a ratio of 2
> 6 dB = a ratio of 4
> 7 dB = a ratio of 5
> 9 dB = a ratio of 8
> 10 dB = a ratio of 10

For the less math inclined, but more information hungry, the formula is

dB = a ratio of (10^(dB/10)).

With a calculator, you get the less integral values like:

3.0 dB = a ratio of 1.9952623149688795
6.0 dB = a ratio of 3.9810717055349722
7.0 dB = a ratio of 5.011872336272722
9.0 dB = a ratio of 7.943282347242816
10.0 dB = a ratio of 10.0
12.0 dB = a ratio of 15.848931924611133
15.0 dB = a ratio of 31.622776601683793
17.0 dB = a ratio of 50.11872336272722
23.0 dB = a ratio of 199.52623149688787
30.0 dB = a ratio of 1000.0

Gregg Wonderly
W5GGW
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

```

AMSAT Home