6-38 Troubleshooting Waveforms: Bluetooth Troubleshooting Waveforms
6.15 Bluetooth Troubleshooting Waveforms
A Bluetooth radiated or conducted signal at 2.402 GHz and a LF radiated signal at 125 kHz can be
used to verify the receiver and transmitter on the radio are operational. A spectrum analyzer (such as
an Aeroflex 3920 Digital Radio Test Set) can be used to verify the presence of BT signal at the BT
antenna contact pin (M1301) on the Main board while the LF signal can be tapped at C2454 or
C2457 on the Keypad board. A signal generator can be be used to test the APX 2000/ APX 4000 BT/
LF receivers. Radiated Bluetooth TX/RX testing should be performed before conducted testing is
performed in the fixture since the radio does not have to be opened for radiated testing. To test the
presence of a radiated Bluetooth TX signal, an external Bluetooth antenna should be connected to
the input of the sprectrum analyzer. To test the presence of a radiated Bluetooth RX signal, an
external Bluetooth antenna should be connected to the output of a signal generator set to TX CW
2.402 GHz. The speaker grille of the radio should be brought near the antenna during testing. The
following is the procedure to activate the Bluetooth/LF transmitter or receiver using RCMP
commands:
To send an RCMP command, connect a RS-232 com port GCAI cable between the radio and PC.
Start HyperTerminal on com 1 (typical RS-232 port) using these settings: 9600 baud, 8-bit, non-
parity, stop bit = 1, HW flow control. Type, “AT#DEBUG”, then type “rcmpraw:000c”.
Bluetooth Command to TX 2.402 GHz CW
Probe the Bluetooth antenna contact pin (M1301) on Main board with a 6 dB attenuator in-line
connected to a spectrum analyzer. Set the spectrum analyzer to 2.402 GHz center, 10 MHz span,
RBW of 300 kHz, a VBW of 1 MHz, and a sweep time of 2.5 ms. There are two commands to verify
a spectrum analyzer can read a 2.402 GHz wave from the radio BT transmitter. Enter the
rcmpraw:00390207 command first, then enter rcmpraw:0039020100000F0006 (on SR 7.9 SW, use
this command:
rcmpraw:0039020100000F, but be aware that the TX signal may time out in less than 10 minutes).
Successful Example Entry:
Type:rcmpraw:000c
Response:800c00
Type:rcmpraw:00390207
Response:8039000207
Type:rcmpraw:0039020100000F0006
Response:8039000201
Table 6-2. Bluetooth Command to TX
TEST RCMPRAW CMD RESPONSE
Bluetooth TX at 2.402 GHz
CW Modulation
rcmpraw: 00390207 Success: 8039000207
Failure: 8039010207
rcmpraw: 0039020100000F0006 Success: 8039000201
Failure: 8039010201
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