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AM Receivers
151
On the Test Set using the knob and data entry keys:
15. Select AC Level.
16. Press the REF SET key.
17. Change AFGen1 Freq from 300 Hz to 3 kHz while observing AC Level
Meter.
Frequency Response is displayed on the screen as AC Level in relative dB
(from 300Hz to 3 kHz) as shown.
NOTE: The audio response should not vary more than +2 to −14 dB (Receiver’s with
loudspeakers) or +1 to −8 dB (Receivers with headphones or feed a line) from
a standard 6 dB per octave de-emphasis curve over the frequency range of 300
to 3 kHz.
Audio
Frequency
Response
To Screen
RX TEST
AC Level
Filter 1
50Hz HPF
Filter 2
15kHz HPF
Atten Hold
On/Off
Ext Load R
8.00
Ω
RF GEN
RF ANL
AF ANL
SCOPE
SPEC ANL
ENCODER
DECODER
RADIO INT
More
dB
dB
-4.72
SINAD
RF Gen Freq
28.310000
MHz
Amplitude
-47.0
dBm
Output Port
RF Out/Dupl
AFGen1 Freq
0.5000
kHz
AFGen2 Freq
1.0000
kHz
AFGen2 To
Off
FM
0 -0.07 24
Ref
AFGen1 To
30.0
%
AM