Motorola Confidential Proprietary
Test Procedures
Service Manual
37
RF Cable Test
DUPLEX TEST
dB
Tx Frequency
Off
Tx Power
-0.62
dBm
AC Level
Off
Off
SINAD
Tune Mode
Auto / Manual
Tune Freq
834.990000
MHz
Input Port
RF In / Ant
15 KHz
On / Off
Rf Gen Freq
834.990000
Amplitude
0.0
Atten Hold
On / Off
MHz
dBm
RF Out /
IF Filter
Ext TX key
Output Port
Dupl
AF Gen1 Freq
1.0000
AFGen1 To
Off
FM Coupling
AC / DC
Audio Out
AC / DC
FM
KHz
AF Anl In
Audio I n
Filter 1
50 Hz HPF
Filter 2
15kHz LPF
DE Emphasis
750 us / Off
Detector
RMS
To Screen
RF GEN
RF ANL
AF ANL
SCOPE
SPEC ANL
ENCODER
DECODER
RADIO INT
More
To test the RF cable for proper loss:
•
Tune Freq
should be set to TX fre-
quency: 834.990000 MHz.
•
RF Gen Freq
should be set to
same frequency (834.990000 MHz).
•
Tx Power
should be set to read in
dBm, not Watts.
In order to properly measure and adjust
the parameters of a telephone, it is im-
portant that you use RF cabling that has
minimal loss. Therefore, it is important
that you test the RF cable for proper loss.
This can easily be done by using the
DUPLEX TEST screen of your HP8920.
To test the cable, set up the DUPLEX
screen as shown above.
Action:
Take the cable under test and connect it
from the RF in/out port to the Duplex
Out port. At this point you will be get-
ting some type of power reading for cable
loss.
Good range:
-.2 dBm through -.8 dBm
Bad cable:
More than -.8 dBm
If the reading you are getting shows gain
(positive number,) you may need to zero
the power meter. This may happen on
an HP8920 whose memory has just been
cleared.
To zero the meter, press the
TX
button
on the 8920 panel. Bring the cursor down
to the field under
TX Pwr Zero
where
it reads
Zero
. Tap the cursor on the Zero
field and it will highlight for a moment
as it zeroes the meter. Set up the screen
as shown above, and test your cable.
Figure 23. Duplex Test Screen
RF Cable Test
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