Ramsey Electronics AM1, Assembly And Instruction Manual, Page: 12 / 19

AM1
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12
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.
ˆ 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.
Transmitter
Frequency (KHz)
C9 (pF) C10 (pF) C16 (pF)
520 - 660
1000
(marked .001 or 102)
2000/2200
(marked .002/.0022)
2000/2200
(marked .002/.0022)
550 - 720 2000/2200
(marked .002/.0022)
2000/2200
(marked .002/.0022)
Not used
700 - 870 1000
(marked .001 or 102)
2000/2200
(marked .002/.0022)
Not used
800 - 1000 470
(marked 470)
2000/2200
(marked .002/.0022)
Not used
1000 - 1250 470
(marked 470)
1000
(marked .001 or 102)
Not used
1250 - 1600 220
(marked 220)
1000
(marked .001 or 102)
Not used
1500 - 1750 220
(marked 220)
470
(marked 470)
not used