Tait TM8000 Series, Service Manual

Page: 123 / 244

TM8100 Mobile Radio Service Manual Servicing Procedure 123
May 2004 © Tait Electronics Limited
Table 5.2 Final tests of receiver functions
Test Limits
Receive sensitivity <118 dBm for 12 dB SINAD
Mute opening:
• Country
• City
• Hard
>6 dB and <10 dB SINAD
>8 dB and <14 dB SINAD
>18 dB and <22 dB SINAD
Audio power (maximum volume at –47 dBm):
• At
“R
X
A
UDIO
/SINAD”
connector on test unit
• At pins 3 (
SPK
– ) and 4 (
SPK
+ ) of power connector on radio
>500 mV
rms
>5.00 V
rms
Distortion (at –47 dBm, 60% rated system deviation at 1 kHz,
with volume set to give 3 W into 16
Ω
load) <3.00%
Table 5.3 Final tests of general radio functions
Test Description
PTT switch Check that PTT switch functions
Microphone Check operation of microphone
Check operation of hook-switch
Data communications Test 1200 baud data transmission (standard)
Test Tait high-speed data transmission (if feature is enabled)
Direct-connect GPS
(global positioning system) Check that GPS poll returns correct position (if feature is enabled)
Selcall Check that radio encodes selcall
Check that radio decodes selcall
Audio tap points and digital I/O Check configuration of programmed options and test operation of
these lines to confirm that Customer requirements are satisfied