Re: 50W PA Damaged
I don't think any ATU will prevent damage to a transmitter due to
human error. The commercial and military equipment employ
extensive circuitry in the transmitter to take care of such
mishaps and shut down to a safe level. A soldier under fire can be
forgiven for not checking the aerial matching. Likewise, an aerial
on a vehicle may be damaged without the operator being aware of
An ATU is basically a means of transforming one impedance to another. If no load is connected i.e. a very high impedance, then that is reflected back through the ATU to your transmitter as a very high impedance. Hence the blown finals.
You could design an interlock system such that if the aerial is
not connected the transmitter does not power up.
On 30/05/2020 11:28, George Korper wrote: