Hello,
I've been thinking about ERP/EIRP and how they're calculated. I see various definitions, but all broadly appear to be;
EIRP = Ptransmitter - Lcable + Gantenna
where P = power, L = loss, G = gain.
That does make some sense, however I have been unable to find any resources that mention the effect of VSWR or return loss. RL is a loss, but they're don't fit into the cable loss parameter (ie insertion loss).
To take an example, say I had a transmitter at 100dBm, an insertion loss of 4dB and an antenna gain of 3dBi then the EIRP would be 99dBm. Say I then tested my antenna and found it was a really bad match at my intended frequency, and 50% of my power was being reflected back into the transmitter. Following the formula above, the EIRP would still be 99dBm, but only half that (96dBm) would actually be "leaving" the antenna.
Does EIRP take into account RL in a way that I've not realised, or is it deliberately not in there?
Thank you!
I've been thinking about ERP/EIRP and how they're calculated. I see various definitions, but all broadly appear to be;
EIRP = Ptransmitter - Lcable + Gantenna
where P = power, L = loss, G = gain.
That does make some sense, however I have been unable to find any resources that mention the effect of VSWR or return loss. RL is a loss, but they're don't fit into the cable loss parameter (ie insertion loss).
To take an example, say I had a transmitter at 100dBm, an insertion loss of 4dB and an antenna gain of 3dBi then the EIRP would be 99dBm. Say I then tested my antenna and found it was a really bad match at my intended frequency, and 50% of my power was being reflected back into the transmitter. Following the formula above, the EIRP would still be 99dBm, but only half that (96dBm) would actually be "leaving" the antenna.
Does EIRP take into account RL in a way that I've not realised, or is it deliberately not in there?
Thank you!
