Jim Kelley wrote:

W5DXP wrote:

Point is that "maximum possible power" will cause a lot of transmitters
to exceed their maximum power rating and overheat.

How much is the maximum possible power? H-Bomb? Gamma ray burst? Big
Bang? ;-)

Maximum power is when you turn your metal 6L6 upside down in a glass of
water during a contest. :-)
--
73, Cecil http://www.qsl.net/w5dxp



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On Fri, 18 Jul 2003 22:32:13 -0500, W5DXP
wrote:


Maximum power is when you turn your metal 6L6 upside down in a glass of
water during a contest. :-)

What I have learned so far:

If you have a 100 watt transmitter, the watt meter shows 3 watts
reflected. I deliver 103 watts to the antenna. I now know where the
reflected power go's. But where did it come from? If I could find a
way to have 100 watts reflected I could put 200 watts to the antenna
from a 100 watt transmitter.

If my transmitter has an output impedance of 50 ohms, all the
reflected power will be absorbed by my PA. I need to find a way to
change my output impedance to something other than 50 ohms?

If I could make my SB-401 act like a radar transmitter, and time the
pulses correctly, I could cancel out the reflected power pulses.

For some reason I need a circulator on my SB-401.

To get max power out my 6146's I need to turn them upside down in a
glass of water? :-)

Dilon Earl wrote:
If you have a 100 watt transmitter, the watt meter shows 3 watts
reflected. I deliver 103 watts to the antenna. I now know where the
reflected power go's. But where did it come from? If I could find a
way to have 100 watts reflected I could put 200 watts to the antenna
from a 100 watt transmitter.

The key word is "to", not "accepted by". You can indeed get 200 watts
to (incident upon) the antenna with a 100 watt transmitter. Trouble
is, the antenna only accepts half of that power.

For some reason I need a circulator on my SB-401.

Only if you allow reflected energy to reach your SB-401.

To get max power out my 6146's I need to turn them upside down in a
glass of water? :-)

Only if they are metal.
--
73, Cecil http://www.qsl.net/w5dxp



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On Sat, 19 Jul 2003 10:11:36 -0500, W5DXP
wrote:

Dilon Earl wrote:
If you have a 100 watt transmitter, the watt meter shows 3 watts
reflected. I deliver 103 watts to the antenna. I now know where the
reflected power go's. But where did it come from? If I could find a
way to have 100 watts reflected I could put 200 watts to the antenna
from a 100 watt transmitter.

The key word is "to", not "accepted by". You can indeed get 200 watts
to (incident upon) the antenna with a 100 watt transmitter. Trouble
is, the antenna only accepts half of that power.


Where does the other 100 watts go?

For some reason I need a circulator on my SB-401.

Only if you allow reflected energy to reach your SB-401.

How can I stop it from reaching my SB-401?

Then all ham transmitters should have a circulator?

Dilon Earl wrote:
You can indeed get 200 watts
to (incident upon) the antenna with a 100 watt transmitter. Trouble
is, the antenna only accepts half of that power.

Where does the other 100 watts go?

It is reflected back toward the source. It causes standing waves
and additional losses in the transmission line.

For some reason I need a circulator on my SB-401.

Only if you allow reflected energy to reach your SB-401.

How can I stop it from reaching my SB-401?

Does the SB-401 have an adjustable Pi-net output? If so,
you can adjust it for a Zg-match which will keep reflected
energy from being incident upon the SB-401 amp. If not, you
can use an external antenna tuner.
--
73, Cecil http://www.qsl.net/w5dxp



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On Sat, 19 Jul 2003 15:25:47 -0500, W5DXP
wrote:

Dilon Earl wrote:
You can indeed get 200 watts
to (incident upon) the antenna with a 100 watt transmitter. Trouble
is, the antenna only accepts half of that power.

Where does the other 100 watts go?

It is reflected back toward the source. It causes standing waves
and additional losses in the transmission line.

For some reason I need a circulator on my SB-401.

Only if you allow reflected energy to reach your SB-401.

How can I stop it from reaching my SB-401?

Does the SB-401 have an adjustable Pi-net output? If so,
you can adjust it for a Zg-match which will keep reflected
energy from being incident upon the SB-401 amp. If not, you
can use an external antenna tuner.

So I can change my reflected power, or SWR by adjusting my Pi-net
output?

I have never seen either one change when changing my load and tune
controls.

Dilon Earl wrote:
So I can change my reflected power, or SWR by adjusting my Pi-net
output?

No, but if a transmitter is capable of being happy, you can make
it happen.
--
73, Cecil http://www.qsl.net/w5dxp



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