Table of Contents
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(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
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
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