Daniels Electronics MT-3 Series Manuale di installazione e risoluzione dei problemi - Pagina 7

Sfoglia online o scarica il pdf Manuale di installazione e risoluzione dei problemi per Scheda madre Daniels Electronics MT-3 Series. Daniels Electronics MT-3 Series 9.

Stampa la pagina

DANIELS

ELECTRONICS LTD.

TN100 System Installation and Troubleshooting

Operational Troubleshooting

5. If the VHF or UHF power amplifier O/T (Over Temperature) indicator is 'ON' this would indicate a

severe power amplifier failure (refer to the service manual).

6. The TX indicator on the power amplifier indicates RF power is present in the module at the input to

the low pass filter. If this LED is not on it may be due to:

a) Incorrect LED threshold setting (internal to the power amplifier).

b) Failed RF module. Check the supply current to the module (VHF requires approximately 5.5 A, UHF

requires approximately 6.7 A).

c) Failed RF cable connector.

d) Failed antenna system.

e) Failed or incorrectly tuned duplexer or multi-coupler

Note 1: Be sure to consider connector, cable and Duplexer losses when measuring the RF power.

Note 2: The normal RF power levels are set at the factory with a nominal supply voltage of 13.8 Vdc.

RF power will vary from +1 to -3 dB if your supply voltage is at the extreme higher or lower levels.

Note 3: Ensure the test equipment is calibrated correctly

2.2

Transmitter Modules Can Not Be Keyed by System

1. Ensure the transmitter 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

Receiver Squelch Does Not Break at 12 dB SINAD

1. The point at which the squelch breaks is not necessarily the 12 dB SINAD point. The receiver mod-

ules have an internally adjustable squelch hysteresis control. Refer to the receiver instruction manual for

more information on this control.

43 Erie Street

Victoria, B.C.

Canada V8V 1P8

TN100 Rev 3-0-0 Sep 08

Toll Free

Canada & U.S.A.

Phone:

1-800-664-4066

Fax:

1-877-750-0004

TECHNICAL NOTES

MT-3 Radio Systems

International

Phone:

250-382-8268

Fax:

250-382-6139

Internet

e-mail:

[email protected]

web:

www.danelec.com

Page 7 of 9