Kirisun DM588, Service Manual

Page: 27 / 151

DM588 Service Manual
Item Environment
Measurement Tool and Method
Index Requirement
Test Device Test Point Tool Method
10. TX SNR
After debugging the TX
modulation sensitivity,
1) Set the tester to TX
state, 300~3kHz to the
filter, and audio output to
1kHz@modulation
sensitivity;
2) Set SNR table to the
tester (with “SNR”
displayed on the screen);
3) Respectively set low,
medium and high TX
frequencies for a
channel, and then press
the PTT key.
General-purpose
tester
Connect
antenna
interface of the
radio to RF
IN/OUT interface
of the tester
* Observe the SNR value of the tester.
1) W: >40dB (wide
band);
2) N: >35dB (narrow
band)
11. Max frequency
deviation
After debugging the TX
modulation sensitivity,
1) Set the tester to TX
state, 300~3kHz to the
filter, and audio output to
modulation sensitivity*10;
2) Respectively set low,
medium and high TX
frequencies for a
channel, and then press
the PTT key.
General-purpose
tester
Connect
antenna
interface of the
radio to RF
IN/OUT interface
of the tester
*
Observe the frequency deviation on
the tester.
1) W: 3.6-5KHz
(wide band);
2) (Not tested)
(medium band);
3) N: 1.8-2.5KHz
(narrow band)
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