Jeff wrote:
Your application of the above equations neglects the first discontinuity.
The first discontinuity (inside the source) doesn't
have any effect on the SWR on the transmission line.

The discontinuity is NOT "inside the source", it is at the source to coax
interface, and as such effects the VSWR that the source sees.

There is usually a piece of coax running from the
source connector back to a filter. I would suggest
that the discontinuity that you are talking about
is indeed some distance "inside the source".

But we users don't care or measure what VSWR the source
sees. Only the PA designer worries about such. We users
only care and measure the VSWR *ON* the transmission line.
--
73, Cecil http://www.w5dxp.com