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Parallel coax
On 9/28/2015 6:18 PM, Ian Jackson wrote:
In message , Roger Hayter writes It would probably make more sense to call return loss "return gain", but, since it is always less than one, that would merely cause a different set of ambiguities. The reflected signal is an attenuated version of the forward (source) signal. It is a 'loss' - in exactly the same way as the signal at the output end of an attenuator is an attenuated version of the source signal at the input end. The RLR (in dB) is the ratio of the what you put in to what you get out. It cannot be less than 1, so the RLR is in positive dB. There is absolutely no ambiguity. No one in RF engineering quotes or uses negative values for RLR (or for attenuators). The greater the RLR, the less signal is reflected. The ratio of output to input can never be greater than one - so the log of that can never be positive. I.E. 100W in and 50W out is -3db, not +3db. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
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