Rick - NJ0IP / DJ0IP <Rick@DJ0IP.de> wrote:
> ... this full power into 3:1 SWR
Hi Rick,
"full power into 3:1 SWR" is just a myth.
Did you ever read such a claim made by TenTec?
There is nothing inside TenTec transceivers to make them
to DELIVER full power into a mismatched load.
TenTec transceiver do not DELIVER full power into a mismatched load.
They just fail to reduce the drive with high SWR because they mis such a
circuitry.
Consequently, the FORWARD power stays the same, at 100 W.
But we must remeber that:
DELIVERED power = FORWARD power - REFLECTED power.
Power meters inside Orion, Omni VII, and virtually all the other rigs
display FORWARD, not DELIVERED power.
With SWR = 3, we have:
FORWARD power = 100 W
REFLECTED power = 25 W
DELIVERED power = 75 W
Similarly, with SWR = 10, we would have:
FORWARD power = 100 W
REFLECTED power = 67 W
DELIVERED power = 33 W
The only thing that can make PA deliver full power into a mismatched load is,
of couse, a tuner.
TenTec transceivers are no exception.
73,
Sinisa YT1NT, VE3EA
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