Daniels Electronics MT-3 Series, Инструкция по установке и устранению неисправностей

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DANIELS DANIELS
ELECTRONICS LTD. ELECTRONICS LTD.
TM TM
TN100 System Installation and Troubleshooting
MT-3 Radio Systems
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.
Operational Troubleshooting
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Canada V8V 1P8 Fax: 1-877-750-0004 Fax: 250-382-6139 web: www.danelec.com
TECHNICAL NOTES
TN100 Rev 3-0-0 Sep 08 © Copyright 2008 Daniels Electronics Ltd. All rights reserved.
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