Icom IC-701

(b) Adjust the signal generator frequency to the receive
frequency (so that a beat note is heard) and set the
signal generator output to make the S meter read
S=5. Adjust coils L2, L10, L11, L12, and L13 in the
“A” unit to get the maximum deflection on the S
meter. If operating properly, a 4dB signal at the
antenna terminal should read S1. If the reading is
slightly off, minor adjustment of L1 and L5 on the
RF unit may correct the discrepancy.
(c) Increase the signal generator output to +90dB (+84dB
loaded) and adjust R153 in the “A” unit to obtain
200 milli Volts on the AC millivoltmeter connected
across the lead of R44 and ground.
(d) S meter adjustment begins with setting the signal
generator output to 4dB and adjusting R22 to make
the S meter read S1. Then increase the signal
generator output to 84dB and adjust R16 to make
the S meter read S9+60dB. If this adjustment is
required, readjustment of the speech processor is
necessary.
NOTE:
DO NOT ADJUST L5, L6 or L9 as ripple will result.
7-3 TRANSMITTER ADJUSTMENT
First, connect an RF wattmeter (impedance of 50 ohms)
to the antenna connector.
7-3-1 CARRIER SUPPRESSION ADJUSTMENT
Place the set in the transmit mode in USB or LSB, 14MHz
band, the compressor OFF and the MIC GAIN fully
counter-clockwise. Connect an RF voltmeter (set to a high
voltage scale) across the lead of D24 in the “’B"” unit and
ground. With an appropriate meter range to have suitable
deflection for reading, adjust R89 in the “A” unit for
minimum.
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D24 Connect an RF voltmeter
R89 Adjust for the carrier null.
7-3-2 GAIN ADJUST (FOR EACH BAND)
Each amplifier stage, mixer stage, etc., has variations in gain
at different frequencies. This requires individual adjust-
ment of the ALC and Compressor levels at every band
selection. This set provides a gain adjustment circuit for
each band and by presetting these circuits, easy operation
can be expected. The following is the adjustment
procedure.
(a) Place the set in transmit, RTTY, 1.8MHz and adjust
the compressor knob to obtain 20 Watts indication
on the RF wattmeter. Turn R92 in the RF unit for
maximum RF power and adjust the compressor knob
again for 20 Watts indication on the RF wattmeter.
(DON’T READJUST THE COMPRESSOR KNOB
HEREAFTER).
(b) Set to receive, change bands to 3.5MHz and set again
to Transmit. Adjust R93 in the RF unit for maximum
RF output. Turn R93 in the direction as indicated
by the arrow to set the RF power to 20 Watts.
(c) Similarly, adjust R94, R95, R96, and R97 for
maximum RF output in the 7, 14, 21, and 28MHz
respectively and turn each resistor in the direction as
indicated by the arrow to set the RF output to
20 Watts.
R93
R95
R97
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