GAI-Tronics ILD1000A Local Deskset User and Installation Manual - Manual (Page 18)

Installation ILD1000A Local Desk Set
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Line (Receive Audio) Input Level Adjustment
The desk set can adapt to input levels ranging from 200 mV
RMS
to 4.0 V
RMS
using the appropriate DIP
switch setting. The DIP switch is located on the main printed circuit board. The RX sensitivity has been
factory set to receive 300 mV ac.
1. Set the range by placing SWA-8 to where it most closely matches the available receive audio level.
Refer to the SWA Switch Settings Table on page 6.
2. Apply an RF generator modulated by a 1 kHz tone at reference modulation level to the station
receiver and adjust pot 1 on the main circuit board for a measured level of 800 mV
RMS
at the TREF
test point.
3. If an RF generator is not available, use an audio oscillator to apply a 1 kHz tone to the receive audio
line at the nominal level expected from the radio.
4. Adjust the RX audio level pot 1 for a measured level of 800 mV
RMS
at the TREF test point.
Intercom Audio Input Adjustment
This audio level is factory set to provide the reference volume with a transmit/intercom audio level of
80 mV ac. If adjustments are needed:
1. Apply a steady 1 kHz tone to the transmit pair from a parallel desk set or audio generator connected
to terminal screws TS1-4 and TS1-5 with the output level set to the radio's recommended transmit
audio level.
2. Measure the level at the TREF test point. Adjust the parallel audio level pot 2 to provide 800 mV
RMS
at the TREF test point.
Handset Microphone
This adjustment is factory-set at a nominal level suitable for many applications. Make adjustments only
after the receive audio level pot and SWA-8 have been properly set.
1. Locate the handset earpiece volume control which is accessible through the lower slotted mounting
hole (pot 3) without opening the unit.
2. If adjustment is needed, use a 1/8-inch slotted screwdriver to adjust pot 3 to a comfortable volume
level.
Desk Set Reassembly
1. After making the required connections, replace the top cover on the desk set and reattach the four
screws in each corner of the bottom housing.
2. To wall mount, affix the desk set to the wall using the molded-in mounting holes.