Rx Alignment; Rx Alignment Locations - Ranger RCI-2950 Service Manual

SETTINGS
AM/FM RF & IF SENSITIVITY:
Put mode selector on FM, RF gain
fully clockwise, Clarifier at 12 o'clock,
frequency at 28.0300 MHz.
FM DETECTOR:
Mode FM.
Set FM RF Generator to 26.965 MHz
0.5uV deviated 3 KHz with 1KHz
audio tone.
Reduce VOLUME as required.
SSB IF SENSITIVITY:
Put mode selector on LSB.
SSB S-METER:
Set mode to USB.
Increase RF Generator output to
26.966 MHz100uV (-67 dBm)
unmodulated.
Set Squelch fully counterclockwise.
AM/FM S-METER:
Set mode to AM.
RF Generator output to 100uV
unmodulated.
Set Squelch fully counterclockwise.
AM/FM SQUELCH RANGE:
Increase RF Generator output to
10mV.
Set Squelch Control fully clockwise.
SSB SQUELCH RANGE:
Set mode to USB.
NOISE BLANKER:
Set radio to 26.975MHz
Set mode to AM.
Set RF generator output to
26.965MHz at 1000uV unmodulated.
Set NOISE BLANKER switch to "ON".
RCI 2950

RX Alignment Locations

CONNECTION
Connect an FM signal generator to the
antenna connector. Set modulation for
±3 kHz, output level at 0.5uV.
Connect a SINAD meter to the external
speaker jack, volume control at about 10
o'clock.
Connect an oscilloscope with a X10
probe to the Cathode of D12. Set
sweep selector for 1uS per division and
vertical input selector for 10mV per
division.
Signal generator to 28.0290 MHz,
modulation off, output level at .5uV.
Adjust Clarifier for best SINAD reading.
Connect oscilloscope same as above.
RF Generator to ANT Jack
Same as above
Same as above
Same as above
Connect DC Voltmeter to TP1 (Cathode
of D2)

RX Alignment

ADJUST ADJUST FOR
L8
Adjust for best SINAD reading and least distorted
waveform on scope. Do not try tuning this coil for
maximum, as this will result in degraded receiver
performance.
L9, L11
Adjust for maximum on scope. Reduce generator
L12, L13
level if necessary, so as not to exceed vertical
L14, L4 height on scope.
L3, L5
and L6
L5
Adjust for best SINAD
L6
L7
Adjust for maximum audio output.
L15 Adjust for maximum on scope.
L16
VR2
Adjust for "S-9" meter reading.
VR1 Adjust for "S-9" meter reading.
VR3 Adjust to the squelch just closes.
VR4 Adjust to the squelch just closes.
L1, L2 Adjust for maximum DC voltage.