GAI-Tronics ITA2000A ITA2000A Series Tone Remote Adapter with Scanning User and Installation Manual - Manual (Page 36)

Installation ITA2000A Series Tone Remote Adapter
03/13 32
Level Settings and Adjustments
Receive Audio Level
The ITA2000A is shipped from the factory set to accept a 300 mV receive audio input level from the
station’s receiver. To accommodate receivers with different audio levels, perform the following steps:
1. After verifying the connections are properly made to the station in accordance with the installation
instructions, apply power to the station and the ITA2000A.
2. Inject a fully quieted (approximately 1000 microvolt) RF signal set to the station receiver’s antenna
connector. Modulate the RF generator with a 1000 Hz tone at rated system deviation.
3. If applicable, enable the proper PL or DPL code on the RF generator at 15% system deviation
(approximately 750 Hz of deviation).
4. Adjust the
RX
level pot for −6 dBm (388 mV) at U18 pin 7, or mic jack J4 pin 8.
5. Remove the 1000 Hz tone or use diagnostic Test 1.
Line Output Level
The phone line level has been factory-set to 0 dBm at reference input level. This setting should be
adequate for most installations. Use the following procedure if readjustment is ever required:
N OTE : For this adjustment, it is necessary to open the housing to gain access to the line out
potentiometer located on the PCBA. It is important that the receive audio level (RX) is set properly prior
to setting the line output level.
1. Perform steps 1 through 3 in the Receive Audio Level section above.
2. While monitoring the line level with an ac voltmeter (with phone line connected), adjust the line out
potentiometer, pot 3, for the required level.
N OTE : It is important not to exceed the level recommended by the line provider.