GAI-Tronics ITR1000-001 Model ITR1000-001 Basic Tone Remote Deskset with Line Select User and Installation Manual - Manual (Page 19)

ITR1000-001 Basic Tone Remote Desk Set Installation
15 02/12
Audio Level Setting Procedure
1. Set up an RF signal generator on the receive frequency with a 1 kHz tone set to system reference
modulation applied to the station antenna.
2. Apply sufficient RF level to ensure a fully quieted radio channel, typically 1000 microvolts. If used,
enable the correct receive CTCSS/CDCSS code.
3. Measure and note the level of the 1 kHz tone impressed on the radio tie line. Adjust the station's tone
remote adapter to produce the desired line level, e.g. −10 dBm.
4. With the 1 kHz tone still applied from the station receiver, monitor the remote audio with an ac
voltmeter at test point TPC1.
5. Slowly adjust the desk set receive level potentiometer (pot 3) until the level just stops increasing
(knee of compression) at approximately −2 dBm.
6. If multiple desk sets are used, repeat this procedure for each unit. Ensure that only the most distant
desk set from the station receiver has the RX line termination jumper in place. Refer to the “Switch
Settings” table in the “Description” section of this manual.
7. If an RF generator is not available, the RX level pots can be adjusted while monitoring a mobile
radio transmission. Adjust the pot as described above until the level at the test point just stops
increasing at approximately −2 dBm. This can be done during a continuous speech transmission, or
during a test conducted from the mobile radio. A setting that is too high may result in excessive
background noise, or 'pumping' of audio.