> From: Steve Thompson
>
> Mimicing poor grid grounding by adding .5" of 16swg (14awg)
> wire between the grid ring and the measurement system ground
> shifts the low impedance point to about 150MHz and the high
> impedance one to about 1500MHz while the feedthrough increases
> to a fairly flat -40dBish from 200MHz to 1.5GHz.
I suspect .5" is a bit conservative (short) for some of the
poor grounding examples I've seen - particularly those that
use a series resistor for grid metering. Much more than .5"
and I suspect you're down around 110 - 120 MHz.
73,
... Joe, K4IK
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|