Hello !

I have some trouble with a King KX 175B Nav/Comm Radio:
I have connected a 14 V Unit to 28 V Power.
(The aircraft has two voltage buses)
Interesting, it does recieve very good and the lamps wont burn out, but once
you set it to transmit, thats it.
It will transmit once and then never again.
It still does recieve.

Did somebody out here made the same mistake ?
How can I fix it ? Is there a fuse inside ?
Any help is greatly appriciated.

Henning DE