33
Level Adjustments
Supervisory I/O
Supervisory I/O information to and from consoles is provided at DIG1, pin 21 of the DB25 connector. The supervisory I/O is
both an input and an output.
Supervisory input and output in console, tone or local mode behaves as follows:
Console Mode - Input - An Ethernet packet supervisor is sent on detection.
Output - When an Ethernet packet is received, the line level is set.
While under supervisory control, TX traffic from the Ethernet to the console is muted. The console’s
audio to the Ethernet is muted. The handset PTT and the IC button are disabled.
Tone Mode - Input - An Ethernet packet supervisor is sent on detection.
Output - When an Ethernet packet is received, the line level is set.
Local Mode - Input- No affect on I/O.
Output - No affect, when Ethernet packet is received.
While under control, manual PTT and the IC button are disabled.
NOTE: For information on programming the supervisory I/O, see “Setup Information” on page 37.
Level Adjustments
Once the IP-223 unit is connected to the system, the level potentiometers can be set. Access to test and adjustment points on
newer versions of the IP-223 are provided through labeled openings on the case top and on the front panel of the unit. On older
versions of the IP-223, access to some of the test and adjustment points is provided through labeled openings on the front
panel; however, the case top needs to be opened to access the other test and adjustment points.
General Alignment
The IP-223 has a TX alignment tone and an RX alignment VU, meter accessible from the front panel of the unit.
• Press and hold the line button and then momentarily press the IC button two (2)
times to generate the 1kHz 0dB TX alignment tone on both lines.
• Press and hold the line button and then momentarily press the IC button three (3)
times to display the RX VU meters.
Radio TX
The Radio TX test points (TP2 and TP6) and the Radio 2 TX test points (TP8 and TP9) are located on the front panel of the
IP-223. These points provide a point to measure the actual signal being placed into the radio or balanced TX line. The front
panel accessible adjustment Radio 1 TX potentiometer (R47) and Radio 2 RX potentiometer (R61) are used to adjust these
levels.
NOTE: If the unit is placed into single-ended mode, the Radio TX+ should be measured with respect to ground.
It is also possible to place jumper J9 (line 1) or J27 (line 2) into the A position to decrease the output of the TX line by a factor
of 10. The final adjustment should allow for undistorted audio to be transmitted for the full range of transmission levels at the
desired deviation. This can be accomplished by turning on the TX alignment tone and adjusting the TX output to 0dB, as
measured into a 600 ohm load.
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