FM Receivers
99
On the Radio set th e Receiver’s Controls as follows:
11 Set power to ON.
12 If required, set frequency to the same value as step 4
13 If required, set CTCSS tone frequency to the same value as step 4
14 Set RF Gain to maximum (if equipped).
15 Set squelch control to minimum (if equipped).
16 Set the volume control until the AC Level reads 100% of the Receiver’s
specified audio output.
Refer to the audio output specifications for the receiver being tested.
17 Verify Receiver’s squelch is closed.
On the Test Set using the knob and data entry keys:
18 Set Amplitude to -137 dBm.
19 Slowly increase th e Amplitude until the squelch remains open and the SI-
NAD indicator shows 10 dB (minimum).
CTCSS Sensitivity is displayed as Amplitude as shown.
• Record this level.
20 Set Amplitude to −47 dBm.
21 Slowly increase the AFGEN2 Freq in 0.1 Hz increments until the squel ch
just closes.
• Record the frequency.
22 Slowly decrease the AFGEN2 Freq in 0.1 Hz increments until the squelch
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
W
dB 0.6321
SINAD
RF Gen Freq
145.280000
MHz
Amplitude
0.282 uV
Output Port
RF Out/Dupl
AFGen1 Freq
1.0000kHz
AFGen1 To
3.00 kHz
FM
AFGen2 Freq
100.0 Hz
AFGen2 To
5.00 Hz
FM
011.16
Avg 24
CTCSS
Squelch Sensi-
tivity