Daniels Electronics TN100 Manuel d'installation et de dépannage - Page 7

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DANIELS
DANIELS
ELECTRONICS LTD.
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
TM
TM
Toll Free
Canada & U.S.A.
Phone:
1-800-664-4066
Fax:
1-877-750-0004
© Copyright 2008 Daniels Electronics Ltd. All rights reserved.
TECHNICAL NOTES
MT-3 Radio Systems
International
Phone:
250-382-8268
Fax:
250-382-6139
Internet
e-mail:
web:
www.danelec.com
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