TROUBLESHOOTING: RF PA Module Test
3.8 Tx Janus Module Test
Note: Perform the Transmit Power Test before beginning this test.
Use this test to check the JANUS Module TX circuitry (TX lineup from BALUN to RX/TX
switch included).
Measure the RF power level
at the JANUS TX input
(which is the input to the TX
BALUN) (L503 at the
TX_IN side)
Do the following:
1. Set the unit to the TX
Power Tune Test.
2. Set the Power Tune
softpot to max auto power.
3. Measure the RF power
level at the antenna port.
The JANUS Module
is OK.
Is
the power level
between 15 and
24 dBm
?
Yes
Yes
No
Yes
No
Measure the DC
voltage at L503. It
should be equal to the
supply voltage.
No
Is
the
power level
> -26 dBm
?
Replace the JANUS
module. Then perform the
TX JANUS Module Test
again.
Set the unit to the Open
Loop Power Test at
813.5125 MHz or
898.51875 MHz.
Is
the power level
between 27 and 30
dBm?
Measure the
RF power level
at the antenna port
Continued
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Is the DC
voltage equal to
the supply voltage?
Perform the
SLEDGEHAMMER Test.
Yes
Is the power level
> 13 dBm?
Yes
Continued
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No
A B
No
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