Experimental Broadcasting Projects - Ramsey Electronics FM10C Manual

EXPERIMENTAL "BROADCASTING" PROJECTS
To use the FM10C successfully as a "broadcasting" service to interested lis-
teners in a school or immediate neighborhood, most of your effort will be con-
centrated on smoothly "managing" or mixing the audio signals fed into the
transmitter input. Operation of the transmitter itself consists simply of the fol-
lowing:
1. Correct construction and adjustment.
2. Carefully checking for an open frequency between 88-108 MHz in ac-
cordance with FCC Rules, Part 15.
3. Setting up a suitable antenna.
4. Connecting the audio source to the Left and Right input jacks.
5. Turn on the transmitter while you intend to be "on the air" and turn it off
when you are finished.
Explaining how to build a simple audio "mixing" panel or box, which is at the
heart of any studio operation, is beyond the purpose of this instruction manual.
We do recommend that you design and build this mixing system yourself, for
several reason:
1. Parts to do so are readily available at Radio Shack.
2. It would be an excellent class, family or Scout project.
3. Commercially-made stereo mixing consoles, while much less expensive
today than a decade ago, will cost much more than did your FM10C kit!
4. The more home-built your complete setup, the more it is in conformity with
the spirit of FCC Part 15 regulations.
If you are designing the FM10C and its mixing inputs to serve as an educa-
tional and entertaining toy for your children, we suggest that the FM10C PC
board be incorporated with the mixing circuits into a durable, non-hazardous
enclosure. If infants and very young children are likely to "examine" this magi-
cal box when their siblings are not looking, it is better not to use a whip an-
tenna, due to the hazard of eye damage. Also, remember that any broken
whips from radios, cordless phones, etc. can become dangerously sharp.
Although many sources exist for audio mixers, the Radio Shack No. 32-1105
is the least expensive commercial device currently available. Bear in mind
that specifications and model numbers for such accessory equipment can
change from year to year. Also, some home-entertainment audio equipment
includes simple mixing capabilities which will permit you to fade and "cue"
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