Rf Testing - Sony SPP-S2730 Service Manual

SPP-S2730
Ver 1.1

RF TESTING

This test is for checking the RF system without disassembling the
set in servicing. Perform measurement using the spectrum ana-
lyzer and jig antenna.
RF Testing method:
Please follow the below instruction to perform RF test.
For the detail of test mode, Refer to the each items of "BASE
UNIT Section" and "HANDSET Section".
1. TRANSMISSION CHECK
1-1. Setting
Connect a receiving antenna to RF INPUT of Spectrum analyzer
and set the unit 10 cm (4 inches) away from the receiving antenna.
Measuring tool : Spectrum analyzer (equivalent to HP8595E)
Jig : Receiving antenna (for Spectrum analyzer)
10 cm
Jig antenna
(Utilize the antenna for handset)
10 cm
1-2. Transmission Waveform Check
Purpose:
It is necessary to check spectrum wave of transmission wave which
is an important factor in order to confirm operational performance
of Spread Spectrum models. If this wave deviates from correct
wave form, normal data transmission cannot be made and, as a
result of that, possibility that occurrence of mute increases and
communication distance becomes shorter will increase.
Spectrum analyzer setting:
Center frequency: 2440.5 MHz
Span : 10 MHz
RBW : 100 kHz
VBW : 100 kHz
Ref Level : 0 dBm
ATT : 10 dB
18
Spectrum
analyzer
Spectrum
analyzer
Test mode setting:
– Base Unit –
[2] [6]
1. Press three keys of ,
enter the test mode.
[4]
2. Press the key to activate test mode D and display "TEST
D". (TX on)
[1] [3]
3. Press the or key to change the channel to 28.
– Handset –
[2] [6]
1. Press three keys of ,
enter the test mode.
[4]
2. Press the key to activate test mode D and display "TEST
D". (TX on)
[6]
3. Press the key to set master.
[1] [3]
4. Press the or key to change the channel to 28.
Test mode setting is complete, check that the waveform on spec-
trum analyzer is displayed as below.
REF 0.0 dBm
10dB/ A_View Norm B_Blank
CENTER 2.44050 GHz
*RBW 100 kHz *VBW 100 kHz
Measuring:
1. Maximum hold the waveform.
2. Set the maker to the peak of waveform with the Peak Search
function.
3. Measure the frequency width of points 6 dB and 20 dB lower
from the peak with the Delta Marker function. (refer to below
figure)
REF 0.0 dBm
10dB/ A_View Posi B_Blank
D E LTA M K R
– 5 1 0 kHz
CENTER 2.44050 GHz
*RBW 100 kHz *VBW 100 kHz
Specifications:
A (width of –6 dB points) : more than 1.4 MHz
B (width of –20 dB points)
[ERASE]
, and simultaneously to
[ERASE]
, and simultaneously to
Norm
SPAN 10.00 MHz
SWP 20 ms *ATT 10dB
MK∆ –510 kHz
Norm –5.44 dB
PEAK
–6dB
A
–20dB
B
SPAN 10.00 MHz
SWP 20 ms *ATT 10dB
: more than 1.8 MHz