Stephen, Thanks for your note.
If hams would think of mismatch in terms of return loss and coupler directivity then they might be less surprised at the variability of SWR measurements between different 'instruments', such as the built-in SWR measurement circuits within our transmitters/amplifiers.
This is an old discussion. See: http://marc.info/?l=elecraft&m=125734496911585&w=2 and: https://www.mail-archive.com/[email protected]/msg76426.html
Wes N7WS On 9/3/2014 2:35 PM, Stephen Prior wrote:
Wes, As someone involved in the design and manufacture of couplers for VSWR measurement for the aviation industry (admittedly some 30 odd years ago!), I would say that you are 100% correct, although I suspect that in amateur gear number 4 in your list is probably the biggest culprit of all. We had people on the production tweaking bridges to maximise directivity and it was a job that required some skill, e.g. bending leads of matched zero bias Schottky diodes until the spec was achieved - admittedly this was in the days before the large scale adoption of lead-less components, which must have made things a bit easier. 73 Stephen G4SJP
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