Motorola APX 7500, Detailed Service Manual

Page: 65 / 164

68009482001 September 9, 2011
Installation: Programming the Consolette 3-23
Table 3-1. RX_Audio Deviation Levels
Connect to the RX_AUDIO path and measure the audio level. The output is nominally 300 mVrms.
Adjust the “RX Codec Adjustment” field to increase or decrease the corresponding gain, then hit
“apply” to see the result. Continue to adjust as necessary by selecting the up arrow or the down
arrow and selecting the “apply” button. Once you have obtained the final setting, then hit “Store” at
the bottom of the page to commit the new gains to the Consolette codeplug.
3.7.3.3.3 Transmit Audio Tuning - Wireline
The Consolette ships from the factory with the “Wireline In (TX) Gain Setting” at a nominal -13.5
dBm. This gain, which is user adjustable from the Gain Adjustments Page (
Figure 3-13 ), is used by
the Consolette when the TRC AGC is disabled. To disable the TRC AGC, set the “TRC AGC
Configuration” to “Disabled” in the Remote Interface Parameters Page (
Figure and Figure 3-11 ).
To adjust the transmit tuning of the Wireline path on the Consolette when AGC is disabled, first make
sure that the “Wireline Function” located in the Audio Parameters Page (
Figure 3-9 ) is set to
“Hardware PTT”. Next, generate a 1 kHz signal at 0dBm from a 600 Ohm source to LINE2+ and
LINE2-. Note: 0dBm across 600 ohms is 775mVrms. Assert the PTT* signal and measure the
deviation of the received RF signal. Adjust the “Wireline In (TX) Gain Setting” field to increase or
decrease the corresponding gain, then hit “apply” to see the result. Continue to adjust as necessary
by selecting the up arrow or the down arrow and selecting the “apply” button. Once you have
obtained the final setting, then hit “Store” at the bottom of the page to commit the new gains to the
Consolette codeplug.
3.7.3.3.4 Receive Audio Tuning – Wireline
The Consolette ships from the factory with the “Wireline Out (RX) Gain Setting” at a nominal value of
29. This gain is user adjustable from the Gain Adjustments Page (
Figure 3-13 )
To adjust the receive tuning of the Wireline path on the Consolette, first generate an on-frequency
signal modulated with a 1 kHz tone at 60% rated system deviation. See the table below for the
deviation levels for each channel spacings:
Table 3-2. Wireline Deviation Levels
Connect to the LINE1+ and LINE1- path (J21 pins 3 and 6) and measure the audio level across a
600 ohm impedance load. The output is nominally 0 dBm (775 mVrms). Adjust the “Wireline Out
(RX) Gain Setting” field to increase or decrease the corresponding gain, then hit “apply” to see the
result. Continue to adjust as necessary by selecting the up arrow or the down arrow and selecting
the “apply” button. Once you have obtained the final setting, then hit “Store” at the bottom of the
page to commit the new gains to the Consolette codeplug.
Channel Spacing Rated System Deviation 60% Rated System Deviation
12.5 kHz 2.5kHz 1.5kHz
20 kHz 4.0 kHz 2.4 kHz
25 kHz 5.0 kHz 3.0 kHz
Channel Spacing Rated System Deviation 60% Rated System Deviation
12.5 kHz 2.5kHz 1.5kHz
20 kHz 4.0 kHz 2.4 kHz
25 kHz 5.0 kHz 3.0 kHz