Alinco DX-70, Service Manual

Page: 87 / 116

7) Receiving Function Adjustment
SG Output Frequency: 14.1000MHz
Frequency: 14.0S93MHz Mode: USB
RF Gain: +10dB AlF: Center
Filter: Wide
Connect to HF Antenna Terminal.
RIT: OFF AGC: FAST NB: OFF
Squelch VR: Turn the knob counterclockwise fully.
Item
Condition
Measurement Adjustment
Equipment Terminal Unit Parts
Method
AGC
SG output: 40dBn
Output: ON/OFF
Mod: OFF
S Meter
Check
Switch AGC. When SG is turned
OFF, the meter moves slowly in
SLOW, and fast in FAST.
RF GAIN SG output: 40dBn S Meter Check
Switch the RF GAIN from +10dB
orderly, the meter swings shorter
and shorter.
FILTER
Switching
Output: OFF
Mode: USB, AM, CW
Check
Switch the FILTER in every
mode (except FM), the noise
sound should be changed.
Band
Sensitivity
SG output: -6dB*i
M.9000MHz
f=3.6000MHz
f=7.0000MHz
(=10.1000MHz
f=21.1000MHz
(=28.1000MHz
Mode: USBorLSB
Audio
Voltmeter
SP Check
In USB mode, SG frequency is
-700Hz.
In LSB mode, SG frequency is
+700Hz.
Make sure that S/N is tOdB or
more.
50MHz
Sensitivity
Connect SG to 50MHz
antenna terminal.
SG output: -10dBn
SGfreq.: 52.1000MHz
Mode: USB
f=52.0993MHz
Check
S/N is 10.5dB or more when
turning ON/OFF SG output.
SG output: -4dBjj.
Mod: 1kHz, 3,5kHzDev
Mode: FM
f=52.0000MHz
Distortion
Meter
Check
SINAD: 13dBormore