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Section B: microphone audio Setup
Step
Reference
Microphone Input
17.
Front Panel Pin 2
18.
R63 (Mic Comp)
19.
Microphone Input
Front Panel Pin 2
20.
R2 (Microphone)
21.
Microphone Input
Front Panel Pin 2
22.
R2 (Microphone)
Section C: audio frequency response and deviation
Step
Reference
23.
AF Gen level
24.
Balanced Audio Input
25.
Balanced Audio Input
26.
Action
Apply Tone.
Adjust and measure.
Change level.
Adjust and measure.
Change level.
Measure and confirm
± 50 Hz.
Action
Set and measure.
Sweep from 300 Hz to
2.5 kHz in 100 Hz steps.
Apply tone.
Perform AF Frequency
Response from 300 Hz to
5 kHz.
Desired Results
Notes
AF Gen: 1 kHz Tone
@ +10 dBm
MIC Connector – Front View
Distortion Analyzer
AF Filter: 15 kHz
4.0% THD
AF Gen: 1 kHz Tone
@ -10 dBm
± 3 kHz
Deviation monitor
AF Gen: 1 kHz Tone
@ -20 dBm
± 1 kHz
Deviation monitor
Desired Results
Notes
AF Gen: +10 dBm
± 5.0 kHz
Deviation should not
exceed maximum
deviation.
AF Gen 1 kHz
@ -18 dBm
As per test sheet limits
(FIT-018)
MT-3 FM Transmitter Mainboard Instruction Manual
29
Transmitter Alignment
MIC AUDIO
3
2
MIC GND
4
1
FRONT VIEW
DANIELS
A
1
2
3
4
5
6
7
8
9
10
TM
11
12
13
14
15
16
17
18
19
20
ELECTRONICS LTD
21
22
23
24
25
26
27
28
29
30
TITLE: TX MICROPHONE CONNECTOR DETAILS
DATE: 28 MARCH 2005
DRAWN BY: EVA DANIELS
DWG No: B0486-01
REV DATE: - - -
IM20-MT3TXMN
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