6.2 Measurement
6-9
50 ohm
ANT
SP
FM-8800S
FM-8800D
SSG
(Standard
Signal GEN.)
4 ohm SP or
4 ohm dummy
or
AF V.V
6.2.6 Sensitivity of a radiotelephone: NQ method
Connect SSG as below.
Fig. 6.2.6 Measurement of Receiving Sensitivity
Procedure
1. Set up SSG (Standard Signal Generator) as follows.
- Set up CH16 (156.8 MHz), for example.
- Modulation frequency: 1 kHz
- Frequency deviation: 3.5 kHz
2. Set up SSG output level to 20 dBuV and audio output of FM-8800S/D to
approximately 1W: 2 Vrms by AF VR.
3. Turn off SSG output in the above state and take a measurement of the FM-8800S/D
noise level. If the noise level is not 2 Vrms, adjust AF VR to 2 Vrms again.
4. Turn SSG to the non-modulation signal, and make an adjustment of SG level.
Find a point that FM-8800S/D audio output is -20 dB (0.2 Vrms)
IEC standard: Less than +6 dBuV
** FM-8800S/D: less than 0 dBuV
To Next Page
Loading...
