[Richard Crowley]

"George Gleason" wrote ...
I really wanted to put it in service sending feeds to battery powered
speakers
I set up large outdoor car shows , some times going 1/2 mile from the
annoucer location
I buit the transmitter to avoid having to drop several 600 foot
speaker cables
I thought a radio link to speakers running off a car radios,and car
battries
would be just the ticket
I may exlore that further now

Wireless microphone equipment is frequently used
for that kind of application. Very frequently used on
movie sets, and even for feeding audio to those big
events on the Washington DC mall where speaker
towers are blocks apart, etc. Some wireless-mic
equipment is specially rigged for feeding line-level
signals (in and out).