Ramsey Electronics FX Series Manual page 108

Channel Switch S2 may be installed at whatever point in the procedure
that is most convenient for you. Its purpose is to apply +5V to the
desired diode bridge. Connect the desired channel positions on the
switch to corresponding matrix channel rows using 2" lengths of hookup
wire.
For all channels installed at this point that you intend for actual 220 MHz
band communication, remember to install a diode in the correct position
for Simplex, +RPT or -RPT. Install in only one position for any given
channel. Remember that the Receiver Frequency corresponds to a
repeater's output and that you are using +RPT or -RPT to match the
repeater's input frequency.
There is no need for diodes in the Simplex, +RPT or -RPT on any channel
intended only for listening. Also, be aware that omitting these diodes does
not completely disable transmitting capability. Be VERY careful and use
common sense when monitoring outside the ham band.
RECEIVER ADJUSTMENT AND OPERATION
At this point, we assume that all preceding assembly steps have been
completed for stages "A" through "H" and that Stages "M" and "TX"
associated with the transmitter have NOT been done. A jumper wire is still in
place between "+8R" and "+8V." All IC's are installed except U4.
NOTE: If you already have done parts installation in stages M and TX, it
would be better to finish that work and follow the test and alignment
instructions provided in those sections. You can still test and use the
receiver section without damaging the transmit section if the directions in
Stage TX are followed exactly. In particular, do not install L10, R32, L9 or
C60 until instructed to do so.
Adjustment Procedure:
1. Check PC board carefully for missed connections, wire trimmings or
untrimmed wires bent down, etc.
2. Connect speaker and DC supply voltage.
3. Obtain or make a non-metallic alignment blade capable of adjusting
L7 and C81.
4. Set frequency to the channel you selected for 223.50 MHz Simplex.
5. Turn on the unit and verify normal operation of squelch and volume
controls.
6. Connect an accurate voltmeter to TP1 and adjust L7 for 1.27 volts
(1.25 to 1.30 is OK for right now.) In our final alignment in Stage TX,
we will touch up this adjustment for 1.60 volts in TRANSMIT mode at