On Mon, 6 Sep 2004 14:44:03 +0000 (UTC), "Reg Edwards"
wrote:


"Richard Harrison" wrote
I`d design for a conjugate match at the rated load and include overload
protection for an output short circuit or near short. For solid-state
I`d provide overvoltage protection.in addition to overcurrent
protection.

===================================

To obtain a conjugate match it is first necessary to know what the source
impedamce is. How or from where is that elusive figure obtained?

It is not given in a transmitting tube manufacturer's data sheets. Perhaps
it doesn't matter what it is - not needed?
----
Reg, G4FGQ

I guess I'll have to repeat it for emphasis, Reg, but if the drive level is set
so that when the tuning and loading of the pi-network is adjusted to deliver the
maximum available power is within the normal operating range, there is a
conjugate match. In this condition the source and load impedances are equal.
This condition is by definition and proved by measurements.

If you like I'll send you a copy of the test procedure and the data.

Walt