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DANIELS

ELECTRONICS LTD.

TN100 System Installation and Troubleshooting

Operational Troubleshooting

3.2

Receiver Has No Squelch Tail

1. The receive and transmit repeat is very fast. To create a squelch tail the transmitter PTT uses a hang

timer to keep the transmitter keyed a moment longer after the input Tx key signal is removed. The hang

timer circuitry is located on the audio contro cardl. Ensure that the hang timer is enabled and the hang

timer adjustment potentiometer is set to an appropriate length of time. Refer to the audio control card

manual for more information on this control.

3.3

Receiver(s) are Noisy and Exhibit Poor Sensitivity

1. Check the battery charging circuits and/or the power sources to determine that the DC charging cir-

cuits are not noisy. Try removing the battery charge source, then re-test the receiver. Repair or replace

the charger if defective.

2. Examine all RF connectors thoroughly. Pull on the RF cables slightly and listen for any changes in

the receivers performance. Check that the center pin of the RF connector is correctly mounted (captive

center pin RF connectors should be used).

3. Check the duplexer alignment if the transmitter appears to de-sense the receiver module.

4. Review the installation area for any "data" or "clock" sources that may be causing harmful interfer-

ence.

4.0

System Monitor

4.1

+9.5 Vdc Switching 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 receiver circuitry. If the trans-

mitter is activated when a receive signal is present (normal repeat), the battery may drop below the SM-

3 hysteresis cutoff point, shutting the power (+9.5 Vdc) to the other subrack modules off, and reducing

the load to the batteries. When the load is reduced, the battery voltage will increase and turn on the SM-

3 hysteresis circuit. This condition causes the subrack modules to turn on and off which will not dam-

age the radios but does indicate a serious failure in the battery system.

43 Erie Street

Victoria, B.C.

Canada V8V 1P8

Page 8 of 9

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

TN100 Rev 3-0-0 Sep 08