KPA100 T-R switch

[Gilbert J Cross]

        Anyone have an idea of just how much power the T-R sw. in the
KPA100 would handle over the 100 watts it is handling . 300 -400 watts?

                Thanks    Gil    K8EAG
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[Don Ehrlich-2]

It is pretty marginal at 100 watts.  Calculate the *peak* voltage of a 100
watt carrier into a 50 ohm load (about a hundred volts .. more if the load
impedance is higher than 50 ohms) to get an idea of the voltage that the
switch must handle.  Then look at the bias voltage for the TR switch (I
forgot .. about 120volts or so I think).

Don K7FJ


>        Anyone have an idea of just how much power the T-R sw. in the
> KPA100 would handle over the 100 watts it is handling . 300 -400 watts?
>
>                Thanks    Gil    K8EAG





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[Don Wilhelm-3]

Gil,

The power handling capability is limited by the reverse bias voltage applied
to the switch, which is about 120 volts under load - so the power limit as
implemented in the KPA100 is only about 120 watts.

You would need a bias voltage in the neighborhood of 300 volts to handle 400
watts, and the switching MOSFETs must also be capable of handling that
voltage.

73,
Don W3FPR

> -----Original Message-----
>
>         Anyone have an idea of just how much power the T-R sw. in the
> KPA100 would handle over the 100 watts it is handling . 300 -400 watts?
>
>                 Thanks    Gil    K8EAG
>

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