Technical information

17
Alignment
1
st
Local Output Level
1. Connect the RF millivoltmeter to J2002 (pin 11) and
tune the transceiver to 28.000 MHz in the CW mode.
2. Confirm that the RF level is at least +5 dBm (or 400
mVrms).
PLL "Unlock" Display Alert
1. Connect the DC voltmeter to J2002 (pin 1).
2. Disconnect the 4-pin plug connected to J5002 (REF-Unit),
and confirm that (A) the voltmeter shows less than 0.5 V
and (B) that "UNLOCK" is displayed on the LCD.
3. Re-connect the 4-pin plug to J5002, and confirm that
the voltmeter shows at least 3.5 V and that LCD dis-
play has returned to normal.
PA Unit Adjustment
Before alignment, set the mode to CW and tune the trans-
ceiver to 1.800 MHz. Nothing should be connected to the
CW Key Jack.
Driver Stage Idling Current
1. Remove the jumper connector at J3005, and insert an
ammeter in its place.
2. Press the microphone's PTT switch, and adjust VR3001
for an indication of 20 mA (±2 mA) on the ammeter.
3. Disconnect the ammeter and reinstall the jumper con-
nector at J3005
4. Remove the jumper connector at J3006 and insert the
ammeter in its place.
5. Press the PTT switch, and adjust VR3002 for an indica-
tion of 60 mA (±2 mA) on the ammeter.
6. Disconnect the ammeter and reinstall the jumper con-
nector at J3006.
Final Stage Idling Current
1. Connect the ammeter between the "13US" pin on PA
Unit and the "13US" pin of the Final Unit. The "13US"
line is currently connected by a wire; remove it so you
can connect the ammeter.
2. Turn both VR5401 and VR5402 fully counterclockwise.
3. Press the PTT switch, and adjust VR5401 for an indica-
tion of 45 mA (±2 mA) on the ammeter.
4. Press the PTT switch, and adjust VR5402 for an indica-
tion of 85 mA (±4 mA) on the ammeter.
5. Release the PTT switch. Re-connect the "13US" line be-
tween PA unit and Final Unit.
VR3001
VR3002
VR5402
VR5401
J3006
J3005