Tone2 Freq

(Radio Ergonomics Configuration, Tone Signaling List)

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Selects the receive Tone 2 frequency for the current Tone Signaling List (record / row). This is only required when a two-tone sequence is required, where Tone1 Freq and Tone2 Freq collectively define the desired sequence of tones in the current Tone Signaling List. This selection applies only for ASTRO Conventional and ASTRO 25 Trunking communications.

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The digital AMBE Vocoder technology used by both the dispatch console and the radio does not precisely encode / decode the corresponding (analog) Quik-Call II frequencies; instead, within the relevant range of frequencies available for Tone1 Freq and Tone2 Freq (265.625 Hz – 3109.375 Hz), the vocoder transforms evenly-distributed groups of frequencies into a set of "standard" frequencies, where each group has an allowable frequency range, and a standard frequency is defined at the center of each group.  Therefore, when a CPS-defined tone frequency is within the allowable range of one of the standard frequencies, it is decoded by the radio as that frequency.

Optimally, the CPS-defined tone frequencies of the radio should match the tone frequencies programmed into the dispatch console, in order to avoid potentially missing a call.

 

Specific tone frequency group definitions are dependent on the Channel Type and, therefore TDMA (Time Division Multiple Access) versus FDMA (Frequency Division Multiple Access) channels.

  • For TDMA channels, there are 91 groups, where each group covers a 31.25 Hz range. See the TDMA Selection table below.

  • For FDMA channels, there are 72 groups, where some groups cover a 31.25 Hz range, and some groups cover a 62.5 Hz range. See the FDMA Selection table below.

 

When configuring tone frequencies:

  1. for a single two-tone frequency record, a combination where both Tone1 Freq and Tone2 Freq are configured as the same tone must be avoided, as that two-tone entry cannot be decoded by the radio.

  2. for a single two-tone frequency record, a combination where both Tone1 Freq and Tone2 Freq fall within the same frequency group must be avoided as they are decoded as the same tone. For example, a two-tone frequency record having 927 Hz and 940 Hz (see the TMDA-applicable table below) are both decoded to be 937.5 Hz.

  3. For two separate tone records, a combination where Tone1 Freq and Tone2 Freq in the two records respectively fall within the same frequency group must be avoided as they are decoded as the same tone sequence. For example, if the first record is 927 Hz and 1240 Hz, and the second record is 940 Hz and 1260 Hz (see the TMDA-applicable table below), both records are decoded as 937.5 Hz and 1250 Hz.

  4. In certain cases, a digital tone frequency cannot be consistently decoded to a specific frequency value; instead it is decoded randomly to one of two different values. The following table lists the tone frequencies that must be avoided for both FDMA and TDMA channels:

Show / Hide the List of Unsupported Tone Frequencies

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When Tone List Type is "Quick-Call II", and

when the radio is model / option capable.

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SELECTIONS:

DEFINITIONS:

"Disabled":

Only a single tone (Tone1 Freq) is applicable for the current Tone Signaling List member.

Tone Frequency Selections Include:

288.5 Hertz   To    3086.0 Hertz

In Increments = 0.1 Hertz

Click to Show / Hide the TDMA-applicable Standard Frequencies and Group Ranges

Click to Show / Hide the FDMA-applicable Standard Frequencies and Group Ranges

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Go to the Digital Tone Signaling List Window