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In the Type 99 Monitor Mode the receive audio remains
unmuted permitting the user to monitor all activity on the
channel. When the user’s own Type 99 tones are decoded, a
beep sounds and an "A" will be displayed, calling his atten-
tion to his own call now on the channel.
Toggling the RESET button allows the user to choose
either the Type 99 Select Mode or Type 99 Monitor Mode of
receiving.
GE TYPE 99 FORMAT
Tone frequencies in the GE tone system fall within the
range of 517.5 to 997.5 Hz.
In the GE tone format, the first tone may be from tone
group A (for Individual or Group calls) or from tone group C
(for Super Group calls). The second tone may be from tone
group B (for Individual calls) or from tone group D (for
Group and Super Group calls).
The GE tone format is illustrated below:
INDIVIDUAL CALL FORMAT
<---1.0 SEC--->
±20%
TONE A
<---200 MS--->
±25%
GAP
<---1.0 SEC--->
300%, -0%
TONE B
GROUP CALL FORMAT
<---1.0 SEC--->
±20%
TONE A
<---200 MS--->
±25%
GAP
<---1.0 SEC--->
+300%, -0%
TONE D
SUPER GROUP CALL FORMAT
<---1.0 SEC--->
±20%
TONE C
<---200 MS--->
±25%
GAP
<---1.0 SEC--->
300%, -0%
TONE D
For example, assume the paging number to be 123. The
first digit of the paging number is a 1. Look in Table 3 and
read down the column labeled "100’s Digit" to a 1. Read
horizontally across the column labeled "10’s Digit". The
tone group is B. The second digit of the paging number is a
2. The tone number is B2. Look in Table 4 and down the col-
umn labeled ’Tone Designator" to find B2. Read horizon-
tally across the column labeled "Tone Frequency". The first
tone frequency is 787.5 Hz.
To determine the second tone frequency look in Table 3
and as before, find the first digit of the paging number (1).
The second tone group is A. The third digit of the paging num-
ber is a 3 and the tone Designator is A3. In Table 4 read down
the column labeled "Tone Designator" and find A3. Read
horizontally across the column labeled "Tone Frequency". The
second tone frequency is 802.5 Hz. For different paging num-
bers, locate the first digit in the "100’s Digit" column and de-
termine the tone frequencies as described in the example.
Tone D is the diagonal tone used (in GE tone systems only)
when the first and second tone frequencies are the same. The
standard frequency for Tone D is 742.5 Hz, but may be pro-
grammed with any tone frequency.
MOTOROLA FORMAT
Tone frequencies in the Motorola tone system are within
the range of 288.5 to 1433.4 Hz. In the Motorola tone format,
the first tone may be one of three tones: A for Individual Call,
B for Quick Call and C for Group Call. The second or final
tone is B in all cases.
The Motorola tone format is illustrated as follows:
INDIVIDUAL CALL FORMAT
<---1.0 SEC--->
(Minimum)
TONE A
<--NONE--->
GAP
<---3.0 SEC--->
(Minimum)
TONE B
GROUP CALL FORMAT
<---1.0 SEC--->
(Minimum)
TONE A
<---NONE--->
GAP
<---3.0 SEC--->
(Minimum)
TONED
SUPER GROUP CALL FORMAT
<------------------------------8 SEC------------------------------>
TONE B
Individual Call
Tables 5 and 6 may also be used to determine the tone fre-
quencies. The first digit of the code determines the tone group
used in the code (see Table 5). Then Table 6 is used to deter-
mine the actual tone frequencies. For a code of 124, the tone
groups used are shown in Table 5. Tone A and Tone B are both
located in tone group 1 and Tone B is tone number 4. Refer to
the following examples for additional information.
Example 1 - Code 098:
The digit "0" in Table 5 (First Digit of Code) shows that
Tone A is in Tone Group 4 and Tone B is in Tone Group 2 (see
Table 6).
Tone number 9 in Tone Group 4 is 524.6 Hz.
Tone number 8 in Tone Group 2 is 879.0 Hz.
Example 2 - Code 265:
The digit "2" in Table 5 shows that both Tone A and Tone
B are both in Tone Group 2.
Tone number 6 is 788.5 Hz.
Tone number 5 is 746.8 Hz.
Group Call (Quick-Call Format)
In Group Call applications, the Tone Group is determined
by Table 7, while the frequency is determined by Table 6. Re-
fer to the following examples.
Table 3 - Tone Groups
The MDS radio is able to recognize the A, B, and C
tones. Individual, Group and Quick Call formats may
be used simultaneously.
NOTE
Table 4 - Tone Generator Frequencies
Table 5 - Motorola Type Coder Numbers
LBI-38652 LBI-38652
6