Yes, a DC blocking capacitor is a good idea in some cases. For example, between
the audio amp's output and the primary of a matching transformer. Otherwise, a
large DC current may flow due to a small DC offset from the amplifier since the
winding resistance is close to zero. This is not the case with a loudspeaker
which has many ohms of DC resistance.

73 de Johan SM6LKM

mal hamilton wrote:
> It has been suggested in the past to use a 15 to 20 uF capacitor in
> series with the amp output to the antenna, but the transformer method
> might be better or use nothing and match the low Z to the antenna.
> de mal/g3kev
>