Ramsey Electronics FX-440 Manual page 130

3. REMOVE the jumper wire between +av and +BA that was used for
receiver testing in previous progress tests.
4. Connect DC power, antenna and speaker.
5. Turn the power switch 'ON' and verify that receiver still works properly.
6. Select a steady signal or turn the squelch control so that the
background noise is audible.
7. Press the microphone button: the TX LED should light, and the
· receiver should be silenced.
8. Touch a wire from ground to pin 3 of the Packet 1/0 jack. Do the same
with ANY resistor that is 47K or lower. Either way, you should get
the same results as in Step 7.
9. Disconnect the DC Power.
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 Preparation
Two parts need handmade preparation before installation in the
transmitter AF 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.
[ ] [ ] TC1 .. WINDING L13 and L14:
Use the heavier gauge wire in your kit for L 13 and L 14, the same
wire that was used to make the diode programming bridges.
Wind these two coils (one looks like a small loop) on the threads of the
1/4"X20 bolt to assure perfect forming. (Or, if you misplaced the bolt, the
job can be done using any true 3/16" OD object such as certain
screwdriver shafts, etc. DO NOT try any other diameter.)
One coil (L 13) will appear to look like a small 'hair-pin' loop of just
one-half turn, while the other coil (L 14) will appear to have two turns if
viewed from the top. Study the drawing to help you visualize them.
Assm. 68
FX-440