Indeed! I don't remember when the acronym "SWR" crept into the Amateur
lexicon, or we became concerned about it, but I'm pretty sure I was
rapidly approaching "OT Status" when it happened. Early on, we link
coupled to the final tank inductor and any reactance in the feedline
just changed the resonant point which was adjustable of course. With
the advent of the ubiquitous pi-network, we were just matching the
impedance presented by the feedline to the plate impedance of the PA's
[a couple of K ohms or so].
There is probably no single thing in a ham station more misunderstood
[or mis-named] than "The Antenna Tuner."
73,
Fred K6DGW
Sparks NV
Washoe County DM09dn
On 4/27/2016 12:21 PM, Don Wilhelm wrote:
One thing that is often overlooked in these discussions is that older
tube type transmitters had an adjustable output network which had a
sizable range for matching antennas. You would 'dip the plate' and
adjust the 'loading' until you could feed the antenna efficiently. With
that, one did not have to pay much attention to SWR or the feedpoint
impedance. The PA output network did the job of matching the plate load
resistance to whatever was connected to the network output (the antenna).
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