6
Copyright 1993 Link Communications
Connecting the Receiver Audio:
- 2 types of audio can be used on the RLC-1 controller:
Type 1: Deemphasized audio (Speaker Audio)
Type 2: Discriminator audio (Raw Unsquelched Audio)
- If type 1 audio is used, remove the appropriate jumper on the controller. This removes the
deemphasis filter from the circuit. As the controller comes shipped, all ports are set up for type 1
audio.
J1 - Main Receiver Deemphasis Jumper
J2 - Link 1 Receiver Deemphasis Jumper
- If type 2 audio is used, place the appropriate jumper in circuit (over both pins). This will place a
- 6dB/octave deemphasis filter into the circuit. Some discriminators can not directly drive the
10K
S
input impedance. If this is the case, a pre-driver or different audio access point will be
required.
- The audio input is connected to pin #5 of the male DB-9 connector
- The audio adjustments will be described in Step #5.
How the DTMF Decoder Works:
The RLC-1's DTMF decoding circuit uses a scanner that enables the controller to receive tones
from all the ports, without mixing the two receiver's audio together. This allows the receivers to
have total control of the DTMF decoder when its Receiver is active. Once the decoder has
detected a tone on one of the ports, it stops scanning and waits up to four seconds for the next
digit. It is reset at the beginning of each DTMF digit. If any of the DTMF digits are held for
longer than 4 seconds or there is a pause of 4 seconds between digits, the DTMF scanner will
resume scanning and all digits entered up to that point will be lost.
Step #5: Connecting Your Transmitters to the RLC-1
Transmitter PTT:
- The RLC-1 produces an active low PTT signal (ground when PTT is active). This output is
buffered with an open drain type driver capable of sinking 150mA. There is a built in 30V zener
clamping diode to protect the PTT MOSFET from the high voltage spikes that can be caused by
interfacing to a PTT relay coil. Your transmitter PTT input should be connected to pin #3 of the
DB-9 connector.
Содержание RLC-1
Страница 19: ...15 Copyright 1993 Link Communications Other Analog Input Examples...
Страница 75: ...71 Copyright 1993 Link Communications Schematic Diagrams...
Страница 76: ...72 Copyright 1993 Link Communications...
Страница 77: ...73 Copyright 1993 Link Communications...
Страница 78: ...74 Copyright 1993 Link Communications Board Layout...