ORIGINAL MESSAGE:
On Thu, 10 Mar 2011 11:40:19 -0500, "Carl" <km1h@jeremy.mv.com> wrote:
>
>165W of loss in a well constructed tuner shouldnt even be a discussion
>point. Tank circuit loss in a 1500W amp is much more and we accept it as
>normal.
REPLY:
Absolute nonsense. Apples and oranges.
Reactances such as found in a properly designed tuner should be nearly
lossless. A linear amplifier can not be lossless because a sine wave is
being amplified. As the tube transitions from zero anode current to peak
anode current and back again, it appears as a changing resistance over
the RF cycle. As a resistor, it dissipates power and this is
unavoidable.
No such thing happens in a tuner.
Basic tube and AC theory, Carl. Time to hit the books.
There are amplifiers which go from zero anode current to max anode
current and back in a very short time and do not have the dissipation
problem, but those are NOT linear amps. Class D is one such example.
73, Bill W6WRT
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|