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Troubleshooting
Troubleshooting the ITR2000A Desk Set
The following is a list of potential problems you may encounter and possible solutions.
Table 12. Troubleshooting
Problem Possible
Solution
Refer to these solutions in
addition to the ones
suggested for the problems
below.
Verify that there is a valid telephone line path from the ITR2000A to the
tone remote adapter.
Ensure that the telephone line is balanced by making sure neither side of the
telephone line is grounded.
The ITR2000A will not
cause the tone remote
adapter to key the radio.
Ensure that the proper tone adapter function tone for keying the radio is
programmed into the ITR2000A. Refer to the tone remote adapter user
manual for valid function tones that will key the radio.
Ensure that the ITR2000A output level is set properly. The high level guard
tone should be set in a range of 0 dBm to –10 dBm into the telephone line.
Assuming no more that 20 dB of line loss on the telephone line, this level
should be adequate for the tone adapter to decode the tone sequence.
Low or distorted RX audio Ensure that the tone remote adapter is interfaced correctly to the radio
system. The quality of the audio signal output depends on the tone remote
adapter.
1.
Use an RF service monitor modulated by a 1000 Hz tone at 60% of rated
system deviation at the receive frequency and CTCSS/CDCSS (if
necessary). Measure and note the level of the 1000 Hz tone across the
ITR2000A telephone line.
2.
Remove the 1000 Hz tone and set the ITR2000A receive level according
to the table shown on page 21. If an RF service monitor is not available,
use a portable or mobile radio.
3.
Transmit to the station and measure the nominal voice audio on the
ITR2000A telephone line.
4.
Set the ITR2000A receive level to the nearest level that was measured
according to the tables on page 21.
Unsquelched noise in RX
audio.
The tone adapter must be connected to a muted and de-emphasized receive
point in the radio. If connected directly to a detector or discriminator
output, continuous noise is heard unless the tone panel has a squelch circuit
to mute the receive radio.
No RX audio.
Ensure that the tone remote adapter is supplying receive audio onto the
telephone line.
Ensure that the ITR2000A desk set local speaker is not muted.
Содержание ITR2000A
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Страница 31: ...27 04 15 Circuit Boards...
Страница 32: ...Circuit Boards ITR2000A Tone Remote Desk Set 28...
Страница 33: ...ITR2000A Tone Remote Desk Set Circuit Boards 29...
Страница 34: ...Circuit Boards ITR2000A Tone Remote Desk Set 30...
Страница 35: ...31 04 15 Schematics...
Страница 36: ...Schematics ITR2000A Tone Remote Desk Set 32 Line Interface Schematic Sheet 1...
Страница 37: ...ITR2000A Tone Remote Desk Set Schematics 33 User Audio I O Schematic Diagram Sheet 2...
Страница 38: ...Schematics ITR2000A Tone Remote Desk Set 34 Control Microprocessor I O Schematic Diagram Sheet 3...
Страница 39: ...ITR2000A Tone Remote Desk Set Schematics 35 DSP Block Schematic Diagram Sheet 4...
Страница 40: ...Schematics ITR2000A Tone Remote Desk Set 36 Tone Keypanel Schematic Diagram Sheet 5...
Страница 41: ...ITR2000A Tone Remote Desk Set Schematics 37 Power Supply Schematic Diagram Sheet 6...
Страница 42: ...Schematics ITR2000A Tone Remote Desk Set 38 Signaling Section Schematic Diagram Sheet 7...
Страница 44: ...Notes ITR2000A Tone Remote Desk Set 40...
