Icom IC-701

(a). With the MODE switch in USB, adjust the AF
oscillator output level to obtain 20 Watts output on
the Watt meter.
(b) Then change the mode to LSB and adjust R2 in the
7-4 PLL UNIT ADJUSTMENT
7-4-1 FREQUENCY ADJUSTMENT
This adjustment can be performed without removing the
“A” unit to obtain the same 20 Watts.
(c) Repeat the adjustments in (a) and (b) until the RF
output for USB and LSB are the same. (20 Watts).
Compressor pass band adjustment
R2 Described in (b)
(A unit)
pass filter. Select the 1.8MHz band and open the top cover
to place the FREQ SET control to the 12 o’clock position.
Align the frequencies referring to the counter display as
shown in the following table.
PLL unit seal. Remove the plug from J2 in the RF unit and
connect the counter to coax 2 — output of VCO low
| MODE | FREQUENCY DISPLAY
14.000.0 R73
@ USB 14.000.0 23,013.0
R68
1.800.0
Oise [3.5000 SSC«dSCSC—iASSCSC~sSS STOW
LSB 21.000.0
Oise 7,000.0 16,010.0
d) LSB 28.000.0
7-4-2 VCO COIL ADJUSTMENT
in
Measure
the
voltage
at
Pin
5
(PD)
of
J1
in
the
VCO
unit
eh
oe
ee
with
the
multi-meter
or
oscilloscope
taking
care
to
avoid
:
ari
aan
oe
urate
=
accidential
shorts
or
grounds.
As
the
measured
voltage
will
os
vary
to
both
polarities,
a
calibrated,
syncroscope
should
be
used for ease of adjustments. The adjustments should be
performed as follows.
The ideal voltage range as we tune from one end of a band
to the other is —3V to OV. The —3 Volt level is maximum
and must not be exceeded. Initially check for the
maximum positive voltage and set it to zero with the
adjustment shown for the band. Then tune through the
band for the low voltage. If it is more positive than —3V,
no further adjustment is necessary. If the low point is more
pinata
neni
en
nate
theodore
A
tne
msec
sanmampectinite
etbuh
eine
ik
Santeenpnenetn
talent
Pt
te
ate
ame
heb
at
a