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5-3.
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.
5-3-1. RF Testing method
Please follow the below instruction to perform RF test.
[Setting Condition]
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)
• Transmission Wave:
Jig antenna
(Utilize the antenna for handset)
Spectrum
analyzer
10 cm
Spectrum
analyzer
10 cm
[Check the Transmission Wave]
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.
Measuring process
• Setting Spectrum analyzer:
Center frequency : 903.6 kHz (CH1)
RBW
Continuous Transmit mode (CH1 High Power)
(Refer to “Test Mode” on page 15)
• Measurement:
Measure transmitting wave.
• Specifications:
Acceptable level [XdB] difference between the highest peak and
the lowest peak of odd side band (the first to seventh side band
from Center Frequency ; Transmission Frequency f
0
: CH1) is
under 10 dB. (Refer Fig. 1 and Fig. 2)
If output wave form deteriorates, side band appears like Fig. 3
and Fig. 4.
CENTER
903.600 MHz
RBW 30 KHz
SPAN
5.000 MHz
SWP 50.0 msec
903.392 MHz
MKR
–16.00 dBm
903.392 MHz
MKR
–16.00 dBm
ATTEN 10 dB
RL 0 dBm
10 dB/
VBW 30 kHz
Fig. 1
–9
–8
–7
–3
–1
–2
–4
–5
–6
1
2
3
4
5
6
7
8
9
f
–1
f
1
f
0
XdB
Fig. 2
CENTER
903.600 MHz
RBW 30 KHz
SPAN
5.000 MHz
SWP 50.0 msec
903.233 MHz
MKR
–14.67 dBm
903.233 MHz
MKR
–14.67 dBm
ATTEN 10 dB
RL 0 dBm
10 dB/
VBW 30 kHz
Fig. 3
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