06-11-2013, 09:49 PM
All very reminiscent of my last employment, working with VHF / FM transmitters with output powers up to 20 kW. During that time, the term VSWR was very rarely heard, whereas the term 'return loss' was commonplace.
It's a pity that that video was spoilt right at the start by the narrator getting the definition of VSWR wrong. VSWR is not, as he stated, the ratio of forward power to reflected power. That is very nearly the definition of the return loss, RL. If the forward power is P1 and the reflected power is P2, then RL (return loss) = 10*log(P1/P2) dB. Apart from that, yes, I found that video interesting: thanks for sending it in.
Just for reference, here are a couple of extracts from Wiki.:
http://en.wikipedia.org/wiki/Standing_wave_ratio
http://en.wikipedia.org/wiki/Return_loss
Al. / Nov. 6, '13 //
It's a pity that that video was spoilt right at the start by the narrator getting the definition of VSWR wrong. VSWR is not, as he stated, the ratio of forward power to reflected power. That is very nearly the definition of the return loss, RL. If the forward power is P1 and the reflected power is P2, then RL (return loss) = 10*log(P1/P2) dB. Apart from that, yes, I found that video interesting: thanks for sending it in.
Just for reference, here are a couple of extracts from Wiki.:
http://en.wikipedia.org/wiki/Standing_wave_ratio
http://en.wikipedia.org/wiki/Return_loss
Al. / Nov. 6, '13 //
