Philips CEM5000/00, Service Manual

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TDA7703/TDA7703R
7.2 AM MW overall system performance
Antenna level equivalence: 0dB
μ V = 1 μ V
rms
Level referred to SG output
before antenna dummy; capacitive dummy 15pF+65pF
Reference modulation = 30%, f
audio
=400Hz, F
rf
=999kHz (1000 kHz for US), V
rf
= 74 dBu
Unless otherwise specified
Limits
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
Tuning range MW Eu/Jp (can be modified by the user) 531 1629 kHz
Tuning step MW Eu/Jp (can be modified by the user) 9 kHz
Tuning range MW US (can be modified by the user) 530 1710 kHz
Tuning step MW US (can be modified by the user) 10 kHz
Sensitivity S/N =20dB 28 dBu
Ultimate S/N @ 80dBu 66 dB
AGC F.O.M.
Ref.=74dBu
-10dB drop point
50 60 dB
Distortion M=80% 0.3 %
Adjacent channel Selectivity
Δ F=9kHz, SINAD=26dB
undesired. m=30%, 1kHz
33 dB
Alternate Channel Selectivity
Δ F=18kHz, SINAD=26dB
undesired. m=30%, 1kHz
50 dB
Strong signal interferer (1)
SNR
Δ F=±40kHz
desired=40dBu
undesired=100dBu, m=30%,
1kHz
17 dB
Strong signal interferer (1)
suppression
Δ F=±40kHz
desired=40dBu
undesired=100dBu, m=30%,
1kHz
1 dB
Strong signal interferer (1)
cross-modulation
Δ F=±40kHz
desired=80dBu
undesired=100dBu, m=30%,
1kHz
maximum SNR of undesired
channel
10 dB
Strong signal interferer (2)
SNR
Δ F=±400kHz
desired=40dBu
undesired=100dBu, m=30%,
1kHz
18 dB
Strong signal interferer (2)
suppression
Δ F=±400kHz
desired=40dBu
undesired=100dBu, m=30%,
1kHz
1 dB
Strong signal interferer (2)
cross-modulation
Δ F=±400kHz
desired=80dBu
undesired=100dBu, m=30%,
1kHz
maximum SNR of undesired
channel
10 dB
Max. Strong signal interferer
Desired = 40dBu
SINAD = 26dB, blocking<6dB
Undesired
Δ F = 400kHz,
m=30% (crossmod. test)
89 dBu
Image rejection 70 dB
Logarithmic field strength
indicator @TBD dBu
read “AM_Smeter_log”
TBD
(equiv.
to TBD
dBu)
TBD
TBD
(equiv.
to TBD
dBu)
-
Rev. 1.0 13/22