Transmit Automatic Gain Control; Howling Suppression; Test Page - Motorola MTP850 S Product Information Manual

92 | Man-Machine Interface
Template Name
Outdoor, Street use
Extended Gen Use 1
Note:
Audio template Extended Gen Use 1 uses the extended TX AGC range (from -15 dB to + 8 dB), whereas the
remaining audio templates use the existing TX AGC range (from -7 dB to +8 dB). When you select a profile based on
these audio templates, the radio uses the extended TX AGC range. When you switch to any other profile, the radio
uses the corresponding TX AGC range.
Note: You can modify an audio profile by changing some of the audio parameters in the codeplug to
modify an audio profile. The subject to the change are for example: Mic Gain, Speech Volume, AGC,
Voice Filters, and Alert Tones Volume. The full list of the parameters specific to particular radio is
available in the Audio Parameters node of the corresponding audio profile.

Transmit Automatic Gain Control

The Transmit Automatic Gain Control (TX-AGC) provides flexibility in terms of operating environment. The TX-
AGC allows to transmit from a radio both indoor and outdoor without having to change a profile. The TX-AGC
provides normalized sound levels to the receiving party.

Howling Suppression

The howling suppression is a mode increasing the stability of the acoustic feedback loop. To enable this anti-howling
function use the menu or the corresponding One-Touch Button. The radio eliminates howling caused by the feedback
loop from the receiving radios to the sending radio in simplex calls.
When the howling suppression is enabled, Microphone and Speaker gain reduction values corresponding to the active
audio profile are taken into use.
You can toggle the howling suppression during an active call.

Test Page

Note: The Test Page option must be enabled in the codeplug. The test page is only for use by authorized
persons. When using KVL 3000 (a portable device used to load encryption keys to a secure entity), set the
baud rate on it to 19200 bits/second.
Use the following key sequence to access the test page: *, #, M
Note: If the test page option is not enabled in the codeplug, you have only access to the KVL mode options
KVL On or KVL Off.
The following information is available in the test page.
Send Feedback | | 68015000878-G
This audio template should be chosen when the radio is
used in a noisy street environment where the ambient
sound pressure level is around 85 dBSPL(C). Example:
Traffic noise environment
This audio template is similar to the General purpose
template, but the extended TX AGC (from -15dB to +8
dB) is used instead of the normal TX AGC ( from -7 dB
to +8 dB). This audio template should be chosen when
there is greater variance in the ambient noise levels of the
environment. Example: Shopping malls, train stations,
outdoor environments with moderate ambient noise.
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ENU IGHT