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Figure 1: Test Equipment Connections

3.4 Third - Select and Execute a Test

3.4.1 CTCSS encoder verification

a. With the external power supply off, connect an oscilloscope or audio analyzer to TONEOUT.

Ensure test equipment’s ground is tied to GND on the DB1065.

b. Set the dip switches D0-D5 for a CTCSS tone selected from Table 4: CTCSS Tones on page

17.

c. Connect PTT to GND.

d. Apply power.

e. Adjust R3 for an amplitude of 300 mVrms.

f. Measure the amplitude, frequency and or distortion of the CTCSS tone on TONEOUT. The

frequency should correspond to the setting of the dip switch in reference to Table 4: CTCSS

Tones starting on page 17.

+12VDC

Power

Supply

+

-

Analog Output

Signals

Connect to

Audio Analyzer,

Meter or

Oscilloscope

Analog Inputs

From Sine wave

generators or

noise source

Optional Serial

Interface

Logic Level

Inputs

Logic Level input or output

Logic level

output

Open Collector

DB1065

Terminals