On Thu, 8 Apr 1999 11:13:44 -0700 Rich Measures <measures@vc.net> writes:
>
ALL SNIPPED
>>>
>>> This is somewhat of the principle behind a load pull test. You
>either
>>> short out or open circuit the output of an amp and then rotate it
>around
>>> the Smith chart (via Ctune). Also, the tank inductor generally
>provides
>>> a large enough reactive impedance to VHF energy that it likely
>doesn't
>>> matter wether you have a load on or not.
>
>? amen. In parasite-arced bandswitches, damage occurs primarily on
>the
>10m and 15m taps. .
Completely subjective and unproven Rich.
Another option which I subscribe to is Peters/Ians version when it comes
to parasitics.
In a real amp that is 100% stable to start with, the switch failures are
primarily due to the mfg trying to save a few $$ and using a poor
initial choice .
Before the doubters wind up in a snit I suggest that they take a real
look at the specs of the commonly used switches and try to understand
exactly what they are spending money on.
73 Carl KM1H
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