Whip antennas with coils
On 8/30/2010 3:19 PM, Richard Fry wrote:
On Aug 30, 3:19 pm, Roy wrote:
Using your antenna as an example, suppose that a transmitter
with output Z of 50 ohms is connected to a tuner that transforms
its output impedance to 0.6 + j1250 ohms. /etc
Note that my post stated "UNMATCHED."
RF
I did. You stated:
Without using a loading coil, the input Z of that whip is about 0.6 -j
1250 ohms. The SWR that this antenna input Z presents to unmatched 50
to 600 ohm transmission line ranges from 52,167:1 to 5,340:1.
In my example, the antenna is not matched to the transmission line. Nor,
for that matter, is the transmitter matched to the transmission line. My
point is that power transfer doesn't depend on either of these points
being matched.
Roy Lewallen, W7EL
|