NXU-2B Operations Manual
6-4
6.3
Radio Interface Troubleshooting Tips
6.3.1
Symptom: User in Field Complains of Missed First Syllables
Cause: Donor radio is trunked, need to compensate for Channel Acquisition Delay
Cause: Slow-to-key transmitter on donor radio
Cause: Secure donor radio, need to compensate for encryption or scrambling delay
Solution: Increase TX DELAY
6.3.2
Symptom: User in Field Complains of Missed Syllables Mid-Conversation
Cause: Dropout from Radio Channel using VOX or VMR COR Detection Type
Solution: Increase VOX/VMR HANGTIME
Alternative Solution: Decrease VOX/VMR SENSITIVITY (make it more sensitive)
Alternative Solution: Verify that RX audio level is sufficiently high – a talker at normal level
should cause flashing of the Audio Input LED with voice peaks.
6.3.3
Symptom: User in Field Complains of Dropped Audio
This refers to dropped audio that is not necessarily always either initial or mid-conversation.
Cause: Radio Channel not always activating VOX or VMR COR Detection Type when it should
Solution: Decrease VOX/VMR SENSITIVITY (make it more sensitive)
Alternative Solution: Verify that RX audio level is sufficiently high – a talker at normal level
should cause flashing of the Audio Input LED with voice peaks.
6.3.4
Symptom: Continuous Ping-Pong between Cross Connected Radios
Cause: ‘Ping-Pong’ is caused by the tendency of some radios to temporarily unsquelch at the end
of a transmit sequence. This momentary Active COR condition in a donor radio will cause a
momentary transmit sequence in any devices that are cross-connected to that donor radio. If one
of the cross-connected devices is another donor radio with the same ‘momentary unsquelch at
the end of a transmit sequence’, then the Radio 1 momentary unsquelch will key Radio 2, whose
resulting momentary unsquelch keys Radio 1 in a continuing sequence.
Solution: Use the COR INHIBIT (after PTT) TIME function to make the receiving NXU-2B
ignore an incoming Active COR signal for a short time after the channel ends a PTT session.
Watch the Channel Active LED on the NXU-2B panel and increase the COR Inhibit time until
the Channel Active LED no longer flashes at the cessation of PTT.
Alternative Solution: Change COR SENSE to VMR
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