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FM Transmitters
73
To Measure deviation of the DTMF on the Test Set:
15 Press the TX key.
Tone deviation is displayed as FM Deviation.
❒ If decoding a sequence of DTMF tones, proceed as follows:
a Set Gate Time to a value long enough to capture the entire sequence
(typically 1 to 5 seconds).
b Set Arm Meas to Single.
c Set Arm Meas (status message will change to “ARMED”).
On the Radio:
d Key the Transmitter.
e Send DTMF sequence.
The symbols and tone pair frequencies will be displayed on the
Test Set as shown.
TX TEST
FM Deviation
TX Frequency
TX Power
AF Freq kHz
kHz
W
kHz
Tone Frequency
145.890058
0.587 0.10354
0.980
Tone Deviation
To Screen
SIGNALING DECODER
Sym
RF GEN
RF ANL
AF ANL
SCOPE
SPEC ANL
ENCODER
DECODER
RADIO INT
More
Input Level
3.0
kHz
AF Anl In
FM Demod
Single/Cont
Arm Meas
Status:
Idle
Mode
DTMF
Standard
Bell
Stop Meas
5
5
5
1
2
1
2
DTMF Tone
Sequence
Hz
Freq
Lo Tone
Hz
Freq
Hi Tone
770.9
770.8
770.9
770.4
770.6
770.3
770.6
1341.2
1340.0
1340.4
1224.6
1340.6
1224.7
1340.7
ms
On
Time
ms
Off
Time
109.9
107.6
108.3
106.0
102.7
107.7
106.6
109.8
111.2
112.8
116.4
112.3
111.7
Gate Time
1.50000
s