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TABLE 3: FM Audio Processor Default / CTCSS / LTR® / DCS Configurations
Default
Jumper
Type
Position
1
XY
Y
Microphone Pre-Emphasis / Flat Audio
2
XY
Y
Balanced Audio Pre-Emphasis / Flat Audio
3
XY
Factory
Custom Temperature Compensation Network
4
XY
Open
Subtone 2
5
XY
Open
Auxiliary Input Routing
6
Single
In
Splatter Filter Output
7
Single
Open
Auxiliary Input Routing
8
Single
Open
Direct Coupled Final OP-Amp O/P
9
XY
Open
Auxiliary Output for Pre-Emphasis
10
Single
Open
4 V AC Ground
11
Single
Open
Balanced Input Compression Bypass
12
XY
Open
Tone / Digital Input Audio Routing
13
Single
Open
Direct Modulation Audio Routing
14
XY
Open
Two Port Polarity Select
15
XY
XY
4 V Regulator Adjust (Bypassed)
16
Single
In
Subaudible Enable
17
Single
Open
Balanced Input Adjust Range Extend
18
Single
Open
Audio Gate Disable
19
XY
Y
Voltage Select (+9.5 V / 8 V) Audio Gates
20
XY
Open
Direct Modulation Audio Routing
21
XY
X
Audio Gate Switch
22
XY
Y
Splatter Filter Enable / Bypass
23
Single
Open
Narrow Band Gain Reduction
24
XY
Factory
y
Custom Temperature Compensation Network
p
25
XY
Open
Wide / Narrow Band Switched Select
26
Single
Open
Auxiliary Output Routing
27
XY
Open
Direct Modulation Input Offset Output
28
Single
Open
Direct Modulation Input Routing
29
Single
Open
Coupling Capacitor Selection
30
N/A
N/A
This skipped designator has been deleted.
31
Single
Open
Splatter Filter Output Routing
32
Single
Open
Coupling Capacitor Selection
Direct Input Coupling – Auxiliary amplifier
33
Single
Open
34
XY
Open
Audio Routing
35
XY
Open
Audio Routing
36
XY
X
AGC Preamp Power Select
37
Single
Open
Direct Couple (TCXO)
38
Single
In
Low Pass Enable
39
XY
X
Low Frequency Amplfier Bias Select
40
N/A
N/A
This skipped designator has been deleted.
41
Single
Open
Narrow Band Gain Reduction
42
XY
Open
Direct Modulation Input Bias Select
43
Single
Open
Direct Modulation Direct / Cap Couple
44
Single
Open
Coupling Capacitor Selection
45
Single
In
Coupling Capacitor Selection (Default)
Audio Processor (V 2.3) Low Band TX Jumper Table
Pre-emphasis /
Description
CTCSS
Y
X
Y
X
Contact Factory
Contact Factory
Open
Open
Open
Open
Installed
Installed
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Y
Y
X and Y both
X and Y both
Installed
Installed
Open
Open
Open
Open
Y
Y
Open
Open
X
X
Y
Y
Open
Open
p
Contact Factory
y
Contact Factory
Open
Open
Open
Open
Open
Open
Open
Open
Installed
Installed
N/A
N/A
Open
Open
Installed
Installed
Open
Open
Open
Open
Open
Open
X
X
Open
Open
Installed
Installed
X
X
N/A
N/A
Open
Open
Open
Open
Open
Open
Installed
Installed
Installed
Installed
1 of 2
1 of 2
Pre-emphasis / LTR® /
Flat / CTCSS
DCS
Y
Y
Contact Factory
Open
X
Installed
Open
Open
Open
<<Updated by Eva June 12-08
Installed
Open
Open
Open
Open
X and Y both
Note:
Open
Open
Open
Y
Open
X
Y
Open
y
Contact Factory
y
Open
Open
Open
Installed
Installed
N/A
Open
Installed
Open
Open
Open
X
Open
Installed
X
N/A
Open
NOTE:
Open
Synthesizer uses Rakon TCVCXO VTXO250U-5 +/- 5 ppm stability
Open
for low band transmitter CTCSS and LTR® / DCS.
Installed
Installed
Interconnect Pins and Jumper Configuration
Audio Processor (V 2.3) Low Band TX Jumper T
Synthesizer uses Rakon TCVCXO VTXO250U-5 +/- 5ppm Stabilty for Low Band TX CTCSS and LTR® / DCS.
Audio Processor
(TCXO Op-Amp)
CTCSS (Pre-Emphasis / Flat)
R35
1K0
R32
51K1
R81
N / I
R54
10K0
C34
1uF
C56
33nF
MT-3 FM Transmitter Mainboard Instruction Manual
33
LTR® / DCS
1K0
51K1
N / I
10K0
47uF
33nF
IM20-MT3TXMN
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