GAI-Tronics ITR2000A Tone Remote Deskset User and Installation Manual - Manual (Page 11)

ITR1000A Tone Remote Desk Set Description
7 02/12
Control Tones
Standard EIA tone keying tones are used for controlling the radio system. The sequence is:
 A 2175 Hz High Level Guard Tone (HLGT) for 120 ms.
 One of 16 function tones (FT) is sent for 40 ms.
FTs range from 2050 Hz to 550 Hz in 100 Hz steps. The FT level is 10 dB lower than the HLGT.
Monitor 2050 FT4 1650 FT8 1250 FT12 850
FT1 1950 FT5 1550 FT9 1150 FT13 750
FT2 1850 FT6 1450 FT10 1050 FT14 650
FT3 1750 FT7 1350 FT11 950 FT15 550
 A 2175 Hz Low Level Guard Tone (LLGT) is generated for the duration of the transmission. The
LLGT is not generated during monitor. Because voice is present with this LLGT, a 2175 Hz filtering
is required in the tone panel.
When the monitor (CTCSS disable) is activated, the HLGT is generated for 120 ms, then a function tone
of 2050 Hz is generated for 40 ms.
Tone Levels
Assuming that the ITR2000A has the HLGT output level set to 0 dBm:
 The FT level and audio voice level are –10 dBm (10 dB below HLGT)
 The LLGT level is –30 dBm.
 The HLGT and FT durations are programmable.
Some tone panels use the value of the FT frequency to provide certain radio control functions. If the
radio supports channel changes from an external logic source, the FT1 frequency of 1950 Hz could be
used to change the radio to channel 1. An FT6 frequency of 1450 Hz could change the radio to
channel 6.
Accessories
Description Part No.
GAI-Tronics Programming Bundle CD XAC4000A
Desk Microphone XDM004A
Footswitch (requires XAAB002A) XFS002A
Gooseneck Microphone XGM002A
Amplified Headset, Single Earpiece (requires coiled cord) XHS003C
Coiled Cord for XHS003C (requires XAAB002A) XCC004B
Coiled Cord with PTT for XHS003C (requires XAAB002A) XCC003C
Programming Cable XAC0004A
Audio Accessory Box XAAB002A