In article ,
Geoff Schultz wrote:

Richard Lane wrote in
:

Geoff Schultz wrote:
Richard Lane wrote in
:

Geoff Schultz wrote:

Can someone explain what "21 dBm" and "Up to 40 EIRP (dBi)" means
in the transmit power section of the above PDF file?

-- Geoff
www.GeoffSchultz.org
21 dBm is 21 dB above 1 mw of power ~105x. 40 dBi EIRP is 40 dB
(10,000x) up on the isotropic (radiated in a sphere) radiated power
and usually refers to a directional antenna gain but such a large
number must include the transmitter power probably relative to 1 mW.
Dick

I'm used to seeing transmit power listed in mW. So from this can I
assume that the transmit power is 105 mW? I still really don't
understand what the EIRP means.

-- Geoff
www.GeoffSchultz.org
EIRP Effective Isotropic Radiated Power.
Dick

I guess that I'm just really slow or you can't interpert my questions:

Can someone explain what "21 dBm" and "Up to 40 EIRP (dBi)" means
in the transmit power section of the above PDF file?

and

So from this can I assume that the transmit power is 105 mW?

A simple yes or no would be sufficient. If "No", what is the actual
transmit power?


-- Geoff
www.GeoffSchultz.org

Ok, Geoff, I'll explain it ....... ERP = Effective Radiated Power
This is Output Power + Antenna Gain - Feedline Loss
It can be expressed in dbm = db Referenced to 1 Milliwatt, OR
it can be expressed directly in Watts or Milliwatts, as well

EIRP = Effective Isotropic Radiated Power
This is Output Power - Feedline Loss without any Antenna Gain
it can be expressed in dbmi = dbm referenced to 1 Milliwatt, Isotropic.
It can also be expressed directly in Watts or Milliwatts as well.

All that Isotropic means is that you are NOT concerned with the Antenna,
or it's Gain or loss, in these power calculations or expressions.


Bruce in alaska
--
add a 2 before @