Motorola APX 7500, Detailed Service Manual

Page: 66 / 164

September 9, 2011 68009482001
3-24 Installation: Programming the Consolette
3.7.3.4 Rear Panel Setup
3.7.3.4.1 Headset Setup
On the Audio Parameters Page ( Figure 3-9 ) there is the “Headset Speaker Volume Ratio” field. This
field provides 3 different volume ratios to the front panel speaker volume. This provides a way to
avoid needing to constantly adjust the Consolette volume knob when switching between the use of
headsets and the front panel speaker. Selections are:
• 1:1 – the headset volume has the same range of the rotary knob as the front panel speaker
• 1.5:1 – the headset volume reaches maximum volume at 66% of front panel speaker maximum
• 2:1 – the headset volume reaches maximum volume at 50% of front panel speaker maximum
3.7.3.4.2 Receive Audio Settings - Headsets
The Consolette supports a minimum and maximum setting for the rear panel headset speaker
volumes. The Consolette ships from the factory with the “Headset Speaker Min (RX) Gain” Setting at
a value of 0 and the “Headset Speaker Max (RX) Gain” Setting at a value of 255. These values are
user adjustable from the Gain Adjustments Page (
Figure 3-13 ).
To adjust these settings for the headset path(s) on the Consolette, connect a headset to one of the
headset paths on the rear panel and listen to normal voice audio. Adjust the rotary knob of the O5
control head volume level to a nominal level.
Adjust the “Headset Speaker Min (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. Similarly,
adjust the “Headset Speaker Max (RX) Gain Setting”.
3.7.3.4.3 Transmit Audio Tuning - Headsets
The Consolette ships from the factory with the “Headset Mic (TX) Gain Setting” at a nominal 5 dBm.
This gain is user adjustable from the Gain Adjustments Page (
Figure 3-13 ).
To adjust the transmit tuning of the Headset path on the Consolette, first generate a 1 kHz signal at
80mVrms from a 50 Ohm source into HD while asserting the HDST1_PTT* signal.
Measure the deviation of the received RF signal. Adjust the “Headset Mic (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. This Headset Mic (TX) Gain Setting applies to both Headset 1 and
Headset 2.
3.7.3.4.4 Crosspatch or APCO PTT Setup
From the Audio Parameters Page ( Figure 3-9 ), the field “Crosspatch-Hardware PTT Selection” can
be used to configure either the Crosspatch interface or the rear panel Hardware PTT (APCO PTT)
interface. These features cannot be enabled simultaneously.
None - This selection disables both Crosspatch and Hardware PTT (Aux Tx).
Crosspatch (Menu Selectable) – With this selection a button may be programmed to enable or
disable Crosspatch from the front panel. If a Crosspatch button is not programmed, the feature will
be disabled.
Crosspatch (Always Enabled) – With this selection the Crosspatch feature is always enabled.