Ramsey Electronics FX Series Manual page 114

OPTIONAL:
Interested builders might wish to verify microphone amplifier operation at PC
board point "PL" before proceeding, but such a test is not essential at this
point. Simply connect a utility test amp to "PL", press the mike button and talk!
Assembly Stage "TC": Transmitter Coil & RF Choke Preparation
A few parts need handmade preparation before installation in the transmitter
RF stages of your transceiver. We recommend that you get them ready for
installation before wiring the Driver and Final stages. If you prefer to proceed
with those stages, winding coils as you go, that's fine, too, as long as you
realize that all coil making details are provided in this section.
The wire used for L9 and L19 is the smaller gauge tinned "bus" wire supplied
with your kit. If you mess up, you can get a whole 50' spool of it from Radio
Shack (278-1341).
TC1: RF CHOKES (two identical units required for L9 and L19): Examine
the two cylindrical ferrite cores provided in the kit. Notice that there are
six holes at either end of these cylinder shaped units, arranged in two
groups of three. Cut 6" of bus wire and following the drawing, thread the
wire, pulling each turn "gently tight." Your finished RF
chokes should look like this: Do not install either part yet.
TC2. WINDING L12, 13, 16 and L22: Use the heavier
gauge wire in your kit for these coils, the same wire that
was used to make the diode programming bridges. Wind these coils on
the threads of a 1/4"X 20 bolt to assure perfect forming and spacing of the
turns. (Or, if need be, the job can be done using any true 1/4" OD object
such as certain screwdriver shafts, etc. Do not try any other diameter!)
Wind 1.5 turn coils for L13 and L16. They will appear to have 2 turns when
viewed from the top. L12 and 22 are similar except they have 2.5 turns.
Wind the 2.5 turn coils for L12 and L22. Viewed from the top or sides,
these coils will appear to have 3 turns, but a careful count of complete
circles will reveal the required 2.5 turns. Study the mounting holes for
these coils on the PC board to help you visualize.
TC3. WINDING L14 and 15: Using the same wire and process as above,
wind a .5 turn coil for L14 and L15 (actually a loop of wire).