Specifications

SG-2000 MANUAL 187

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

FONE connector to B.U.T. J4.

Audio connector replaces wires 9 and 10 of J1 remote cable.

Turn on the power supply and then the radio. Set the radio to the base station

frequency in A3J mode.

Set the Oscilloscope:

Vertical = 1 volt/div.

Horizontal = 0.2 msec/div.

Set the Distortion Analyzer:

Function = Voltmeter

Meter Range = 1.0 VRMS

Set Audio Generator:

Load = External

Frequency = 1 KHz

Amplitude = 0 VRMS

23.3.6 S Meter Test

Adjust the amplitude of the audio signal generator for a full scale reading on

the S meter. Full scale should correspond with a 10 dB increase from a 0 (no

segments) indication of signal strength. Record the VRMS amplitude and dB

level on the Distortion analyzer.

Full display zero display

Amplitude .3 to .4 VRMS .03 to .05 VRMS

dB -4 dB -15 dB

Reduce the amplitude of the audio signal until there are zero bars on the S

meter.

Record the dB difference on the Distortion analyzer. This should be:

? dB = 10dB ?2 dB -4 dB - (-15 dB) = 11 dB

If test fails, check IC14 pin 2. For .5 VRMS Audio Input from generator, it

should read 2.7 VDC and for .05 VRMS it should read .2 VDC.