Telex IP-223 iDen Interface NI-223 Plus - Manual (Page 10)

NI223Plus - 11 -
5.1.2 Receive Audio Alignment
The standard Receive audio alignment procedures should be followed for the NI223 Plus
installation. With AGC turned OFF, inject a 0dBm test tone into the IP-223 front end and
measure the level at the Receive audio test points for line 1 or 2. (TP13 or TP1) The level should
be near, but below 0dBm reference from the test point to ground (TP14, near TP13). This should
result in audio levels from the iDen® Radio at –5dBm to –10dBm as shown in Figure 9. A meter
can be used if the unit is on the bench top, or if installed, the front panel VU meter can be used.
To access the VU meter Press and Hold the line button, then press the IC button three times. A
general talk test is still the best mechanism for ensuring a quality connection. The system can be
tested with a handset from the front panel as well. To purchase the handset, contact the Telex
Vega Sales department.
Figure 9 IP-223 Receive Audio Alignment Example