Bredhurst Receiving and Transmitting Society

Advanced Radio Amateur Examination


Return loss 

In this section we come across the formula :-

Example: What is the SWR if the Vforward is 100V and Vreverse is 50V ?

Result 3:1 SWR

Whilst this might be an easy calculation that you could do on a simple calculator using the key strokes including the brackets that you would use for other calculation keeps you thinking along a single procedure using the calculator.

and RETURN LOSS at transmitter = Return Loss at antenna + 2 x (feeder loss)

Return LossT = Return LossA + 2(feeder loss)

Example: The Return loss at the antenna is 3dB and feeder loss 6dB what is the return loss at the transmitter ?   


 Result 15dB

Next Field strength

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