CTI Products TSAM Transmitter Steering & Audio Matrix - Manual (Page 68)

TSAM Installation and Maintenance Rev. 2.10 Chapter 7
CTI Products, Inc. Tone Timing Diagrams
60
7.2 PL Monitor / Enable Tones (No TX)
The following figure shows the PL Monitor tone sequence in Sustained Mode.
HLGT
0 dBm
Mon
-10
120 ms 40
PL Monitor
TRC Sequence
FT is the Function Tone for Current Frequency
HLGT & LLGT are typically 2175 Hz
Timing and frequencies are programmable.
Base station resets to Guarded RX mode after detecting keying tone (w/o LLGT).
HLGT
0 dBm
FT
-10
120 ms 40
HLGT
0 dBm
Mon
-10
120 ms 40
Mon is PL Monitor Function Tone
PL Monitor
Input (Active Low)
Base in PL Monitor Mode Guarded RX
Figure 16 PL Monitor Tone Sequence -- Sustained Mode -- No TX
In Momentary Mode the second set of tones would not be generated.
The receiver would go into guarded mode on the next transmission.
7.3 PL Monitor / Enable Tones (With TX)
The following figure shows the PL Monitor tone sequence in Sustained Mode.
FT is the Function Tone for Current Frequency
Mon is PL Monitor Function Tone
PL
Monitor
Input
Audio to TX
PL Monitor
HLGT
0 dBm
Mon
-10
120 ms 40
HLGT
0 dBm
Mon
-10
120 ms 40
Monitor
HLGT
0 dBm
FT
-10
120 ms 40
TX
HLGT
0 dBm
Mon
-10
120 ms 40
HLGT
0 dBm
Mon
-10
120 ms 40
Monitor
TX Guarded Rx Guarded PL Mon
Base
Status
TX resets base
to Guarded
mode.
TSAM
Forces
PL Monitor again
Programmable
Dead Time
Dead time may be required depending upon base station decoding characteristics.
Figure 17 PL Monitor Tone Sequence -- Sustained Mode -- With TX
After transmission, the TSAM waits a programmable dead time and then re-generates the PL Monitor tone
sequence.
In Momentary Mode the tones after the transmission would not be generated.
The receiver would remain in guarded mode.