13-07-2017, 10:05 PM
(This post was last modified: 13-07-2017, 10:12 PM by Alistair D.)
Jeffrey, you haven't misunderstood the maximum power transfer theory with regard to transmitters. Most transmitters are designed to have a much lower output impedance than the aerial so although max power transfer is not achieved much more of the output power is dissipated in the aerial than the transmitter. This point was mentioned just recently in a post over on UKVRRR.
The fact that 50R is the accepted standard aerial impedance has nothing to do with power transfer but is to do with
a) It is the characteristic impedance of a half wave dipole.
b) It is purely resistive.
c) 50R is a good compromise between aerial voltage and current.
Mike, there should be a dot on the schematic where the heater wire crosses the wire from the heater battery to the HT battery showing that those connections are joined.
Al
The fact that 50R is the accepted standard aerial impedance has nothing to do with power transfer but is to do with
a) It is the characteristic impedance of a half wave dipole.
b) It is purely resistive.
c) 50R is a good compromise between aerial voltage and current.
Mike, there should be a dot on the schematic where the heater wire crosses the wire from the heater battery to the HT battery showing that those connections are joined.
Al
Tuned for maximum smoke . 
