Topband: Shunt or parallel Matching Coil Questions

[Tom W8JI]

> The thing works, I mean the shunt match works.

It historically has been a good minimum component system.

> what would be a good Q for just the coil?  300, 600, 900
>

The required component Q depends on the application, how much current flows 
through (or voltage across) the device and the impedance of the device and 
how much loss or heating can be tolerated.

Since single components in parallel with the feedpoint are at  low impedance 
and usually have modest current, you probably would  never see a signal 
difference between something with a component Q of 50 and something with a 
component Q of  1000. The limiting consideration is almost always heat.

> Operating Q, what is the desired value?  Whats your formula for that?
>

We know the real part of  impedance across the inductor is 50 ohms, but I 
have no idea what the inductor reactance is. All questions could be answered 
knowing the required operating reactance or inductance. We know there is 
only about 275 volts across the reactance at 1500 watts.

73 Tom