Kirisun DM588, Service Manual

Page: 31 / 151

DM588 Service Manual
Item Environment
Measurement Tool and Method
Index Requirement
Test Device Test Point Tool Method
2. Receiving
Sensitivity
1) Set the tester to RX
state;
2) Set RF Gen Freq =
debugging frequency;
3) Set AF Gen1 Freq:
1kHz
AF Gen1 To: 3kHz
Set 300Hz-3kHz to the
filter
Ext Load R:16
General-purpose
tester
Connect
antenna
interface of the
radio to RF
IN/OUT
interface of the
tester, and
EXT-SPK+
interface of the
radio to AUDIO
IN interface of
the tester.
PC
1) Run the debugging software on
the PC, and set the tester to
adjustment mode;
2) Double click Receiving Sensitivity,
and click [Low Frequency];
3) Set the Amplitude to -119dBm and
a low frequency, click Start. Adjust
the values of the software to get a
maximum SINAD (>=12dB);
4) Respectively adjust the receiving
sensitivity at medium and high
frequencies;
6) Click Stop to stop debugging.
SINAD>=12dB
W: -119dBm;
N: -119dBm
3. Squelch Level 1
on for Analogue
Narrow Band
1) Set the tester to RX
state;
2) Set RF Gen Freq =
debugging frequency;
3) Set Amplitude =
-123dBm:
AFGen1 Freq: 1kHz;
FM:1.5kHz
General-purpose
tester
Connect
antenna
interface of the
radio to RF
IN/OUT
interface of the
tester
PC
1) Run the debugging software on
the PC, and set the tester to
adjustment mode;
2) Enable Squelch Level 1 for
Analogue Narrow Band, click [Low
Frequency], and click Start. Click
stop when the value is stable;
3) Repeat the above steps on
medium and high frequencies
respectively.
(Squelch Level 3)
Squelch on under an
input of -119dBm,
and off under
-125dBm
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