Antenna Considerations - Ramsey Electronics AM1 Assembly And Instruction Manual

Transmitter
Frequency (KHz)
520 - 660 (marked .001 or 102)
550 - 720
(marked .002/.0022)
700 - 870
(marked .001 or 102)
800 - 1000
(marked 470)
1000 - 1250
(marked 470)
1250 - 1600
(marked 220)
1500 - 1750
(marked 220)
antenna) is extremely sensitive and a good indicator of what stations will be
received in your area.
Once your have determined what your operating frequency will be, refer to
the following chart for the correct values of C9, C10 , and C16.
Install the correct values for C9, C10, and C16.
CONGRATULATIONS
You have just completed your AM1 wireless broadcast unit. Take a well
deserved break now. Give your eyes a rest. When you return, be sure to
check over your work on the entire circuit board. Energizing the circuit board
with solder "bridges" or misplaced components can damage your kit.

ANTENNA CONSIDERATIONS

For many applications, a 5 - 6 foot wire antenna connected to the center pin
of the "RF OUT" connector will produce satisfactory results.
Another simple but effective hint is to connect the chassis "ground" to a good
earth ground (like a cold water pipe, etc.). Be sure, however, that the total
length of the antenna, feedline, and grounding wire is less than 10 feet as
required by the FCC Part 15 rules.
C9 (pF) C10 (pF)
1000 2000/2200
(marked .002/.0022)
2000/2200 2000/2200
(marked .002/.0022)
1000 2000/2200
(marked .002/.0022)
470 2000/2200
(marked .002/.0022)
470
(marked .001 or 102)
220
(marked .001 or 102)
220
(marked 470)
•
AM1 12
C16 (pF)
2000/2200
(marked .002/.0022)
Not used
Not used
Not used
1000 Not used
1000 Not used
470 not used