TROUBLESHOOTING: SLEDGEHAMMER TX Test
SLEDGEHAMMER Tx Test (Continued)
Are the training
waveform and
modulation OK?
Yes
No
Do the following:
1. Monitor the RF waveform at the antenna
port.
2. Check for the correct phase and
amplitude train waveform.
3. Check that the modulation peaks are
lower than the amplitude training ramp
peak.
Set the unit to the Open
Loop Power Test.
Continued
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Continued
from previous
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The SLEDGEHAMMER IC
is functioning properly.
Note:
Baseband modulation output is
approx. 11 Hz at 1.77V dc
offset during the TX slot
A
B
Continued
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Do the following:
1. Remove the SLDGEHAMMER shield.
2. Visually check all components and
solder connections.
3. Check R654 and R651 for 2.775 Vdc.
Is the RF
Level > -19 dBm at
1735.4933 MHz?
With the oscilloscope measure the
ROADRUNNER baseband modulation
output at the TP_TXI and TP_TXQ tests
points on the keypad side of the board.
Yes
Is the signal
770 mVp-p during the
TX slot??
Yes
C
Perform the
Main VCO Test.
No
D
No
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