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DANIELS

ELECTRONICS LTD.

TN100 System Installation and Troubleshooting

MT-3 Radio Systems

5.0

Audio Control Cards

5.1

Deviation Between Receiver and Transmitter are Incorrect

1. Check the receiver output level using the extender card and note the impedance, either 600

or 5 K

(refer to the MT-3 Application Specific Manual).

2. Check the transmitter input level using the extender card, and note the impedance, either 600

5 K

3. Reset the audio level on the audio control card for the desired system deviation operation.

5.2

CTCSS Operation Incorrect

1. Check that the front panel switch is in the 'ON' position for CTCSS operation.

2. Encode / decode module can be selected for encode only, decode only or both. Check that the desired
operation is selected (refer to the MT-3 Application Specific Manual).

3. The encode / decode frequency may be wrong. Use the DIP switches to select the correct frequency
for encoding and decoding the same tone. To encode a tone different from the decoder a separate CTCSS
module is used. Set this low current module using solder jumpers.

4. If a sub-audible tone appears on the repeat audio path check that the subtone filter on the audio con-
trol card is enabled or the receiver has its optional sub-tone filter installed.

Operational Troubleshooting

Page 9 of 9

43 Erie Street

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International

Internet

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Phone:

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Phone:

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e-mail:

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Fax:

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Fax:

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web:

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TECHNICAL NOTES

TN100 Rev 3-0-0 Sep 08

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Содержание MT-3 Series

Страница 1: ... system and performance of the sys tem at room temperature 25 C is documented and measured As an option extensive environmental testing can be conducted over the temperature range 40 C to 60 C and the performance measured to ensure compliance with the design specifications A Daniels MT 3 radio system consists of seperate RF receiver and transmitter modules plugged into a standard 19 subrack Each s...

Страница 2: ...10 JU11 JU12 JU3 JU4 JU5 JU6 JU13 JU14 JU15 JU16 JU18 JU19 JU20 JU21 CR23 CR24 CR25 CR26 R7 R8 R9 R10 CR6 JU32 JU33 JU34 JU35 C10 RX A J3 TX A J2 M3 CONTROL P1 CONTROL MODULE J1 RFC1 CR3 CR4 CR5 CR7 CR8 CR9 CR10 CR19 CR20 CR21 CR22 R3 R4 R5 R6 JU24 JU25 JU26 JU27 JU42 JU41 JU28 JU29 JU30 JU31 C9 J21 RX A AUDIO JU 2 RX A 9 5 V JU8 JU7 14 1 J67 J9 J72 J73 U82 C84 1 10 J74 JU69 U80 1 2 3 C90 C91 CR27...

Страница 3: ...auxiliary connector on the rear of the subrack All wiring should be made to this screw type terminal connector 10 For some applications a cable not a terminal strip connector is used to connect to the auxiliary con nector The cable must be plugged into the P1 auxiliary connector on the rear of the subrack Ensure locking tabs on the connector are completely engaged Receiver and Transmitter Modules ...

Страница 4: ...grading the power output of the radio system ensure that the guide rails for the power amplifier are installed properly 3 Connect the RF cables and ensure they are firmly screwed on 4 Apply power to the subrack while measuring the RF power output The RF output should be approx imately 30 watts with a 13 8 Vdc supply voltage If the power level must be changed adjust the exciter level internal poten...

Страница 5: ...be 10 to 17 Vdc at the power input 6 Measure the battery voltage at the system monitor if one is installed Select the supply voltage func tion on the system monitor rotary switch and measure the voltage at the front panel test jacks There should be 10 to 17 Vdc at this point 7 If a system monitor is part of the radio system jumper JU40 is usually not installed Power is then routed through the syst...

Страница 6: ...mplifier is part of the system check that its output is at 30 watts maximum It is possible to drive these units to an output of 50 watts Under these conditions the fuse rating may be exceeded 2 0 Transmitters 2 1 Low or No RF Output 1 Confirm all RF connectors are securely fastened 2 Ensure the transmitter module s are fully plugged in to the subrack and the quick release fasteners are in the lock...

Страница 7: ...ransmitter module s are fully plugged in to the subrack and the quick release fasteners are in the locked position 2 Make sure the PTT jumpers are installed on the MT 3 motherboard selecting PTT With Time Out WTO or PTT With No Time Out NTO Refer to the SR 3 subrack instruction manual for jumper options and locations 3 Check the PTT system configuration on the audio control card 3 0 Receivers 3 1 ...

Страница 8: ...g On and Off 1 Depending on the hysteresis settings in the SM 3 factory standard is 8 Volts shut off 11 Volts turn on see system monitor instruction manual for different settings the hysteresis circuits can oscillate if a battery cell fails opens and the subrack is in the receive mode In the receive mode the current drain is low and the open battery may still deliver the current required by the re...

Страница 9: ...ng Use the DIP switches to select the correct frequency for encoding and decoding the same tone To encode a tone different from the decoder a separate CTCSS module is used Set this low current module using solder jumpers 4 If a sub audible tone appears on the repeat audio path check that the subtone filter on the audio con trol card is enabled or the receiver has its optional sub tone filter insta...

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