Ramsey Electronics FM10C Manual page 14

29. Install L3, a 2.2uH inductor (red-red-gold). This part is located be-
tween L4 and the power jack J3.
30. Install C16, a .001uF ceramic capacitor (marked 102). This part is
near the audio section.
31. Install J3, the 2.1mm DC power jack. You can gently bend the leads
to keep this part from falling out of the board when you flip the board
over to solder it.
Multiplexer Balance
32. Install R7, another 100K ohm trimmer potentiometer. (marked 104).
Multiplexed Audio/Pilot
33. Install R9, a 4.7K ohm resistor (yellow-violet-red).
34. R8's value will depend on the frequency band that will be used. It
will be calculated and installed in the next section.
35. Install C13, a 220pF ceramic capacitor (marked 221).
36. Install C14, a 10uF electrolytic capacitor. Remember polarity.
37. Install C21, a .001uF ceramic capacitor (marked 102).
RF Oscillator
38. Install C17, a .001uF ceramic capacitor (marked 102).
39. Install C19, a 10pF ceramic capacitor (marked 10).
40. Install shielded slug tuned coil L4. The larger tabs secure the shield
can to the ground foil connections, while the two thin leads are the coil
connections. If you find that the coil lead wires do not line up with the
PC board holes, simply "pull" the coil insert from the shield can, rotate it
a quarter-turn and insert back into the can. Make sure L1 is squarely
against the top of the PC board before soldering, solid installation of L1
is essential to the frequency stability of your transmitter.
41. Install C20, another 10pF ceramic capacitor (marked 10).
42. Install C26 a 1pF ceramic capacitor (marked 1). A via that connects
the ground plane on the top of the circuit board to the one on the bottom
is in the middle of C26's pattern. Make sure to use the two outside holes
in this pattern.
43. C18's value will depend on the frequency band that will be used. It
will be calculated and installed in the next section.
FM10A 14