group #13 west virginia university - lcsee department. group members: bahassan, maher rosendale,...
TRANSCRIPT
Group #13Group #13
West Virginia University - LCSEE West Virginia University - LCSEE Department.Department.
Group Members:
Bahassan, Maher
Rosendale, Matt
Rossetti, Anthony
Retransmitted = 146.76
Retransmitted = 146.76Transmitted
Transmitted
146.16 MHz
146.16 MHz
User AUser B
DTMF = Dual Tone Multi Frequency
1209 Hz 1336 Hz 1477 Hz 1633 Hz
697 Hz
770 Hz
852 Hz
941 Hz
1 2 3 A
1 2 3 A
4 5 6 B
1 2 3 A
7 8 9 C
* 0 # D
COR & PTT
SIGNAL SIGNAL
AUDIO
ACTIVE/ENABLE
DUPLEXER
Receiver Transmitter
Inside The Simplest Repeater
AUDIO
ACTIVE/ENABLEReceiver Transmitter
SIGNAL SIGNAL
AUDIO AUDIO
Receiver TransmitterControl Control
Telephone Line
DUPLEXER
Receiver
CONTROLLER
Transmitter
PowerSupply
146.16 146.76
Inside A Real Repeater
Controller RequirementsController Requirements• User changeable defined call sign - ID’s every ten minutesUser changeable defined call sign - ID’s every ten minutes
• Telephone InterfaceTelephone Interface
• Inhibits telephone communication after 3 minutes (exception Inhibits telephone communication after 3 minutes (exception emergency calls)emergency calls)
• Remote accessing of controllerRemote accessing of controller
• Watchdog TimerWatchdog Timer
• Courtesy Tones (Half-Duplex)Courtesy Tones (Half-Duplex)
• RF shieldingRF shielding
• Hang TimeHang Time
• Rapid Transmissions (Kirchunking)Rapid Transmissions (Kirchunking)
Should not have inappropriate Should not have inappropriate interference with transmitter and interference with transmitter and
receiver!!!receiver!!!
•New Technology
•Auto-Patch
•Smart Identification
•Remote Shutdown
•“Kirchunking”
•Optically Coupled
Motorola Microprocessor
RelaysRelays
• Opto/Audio Opto/Audio IsolatorsIsolators
• DTMF DecoderDTMF Decoder
• DTMF EncoderDTMF Encoder
• Tone GeneratorTone Generator
• TelephoneTelephone
•Audio AmplifierAudio Amplifier
•MicroprocessorMicroprocessor
•MemoryMemory
•Transmitter/Transmitter/ReceiverReceiver
12 Volt Source
On/OffControl
Audio In: From Receiver or Telephone
Data Signal In Audio Out: To Transmitter Or Telephone
DAH SelectControl Inputs DIT Select
SPACELED Display and Telephone Control
Telephone Status
POWERSUPPLY
IsolationTone
Generator
DTMFDecoder PIC
DTMFEncoder
MixerAmp Isolation
Isolation
Projected Architecture
Transmitter ActivationTransmitter Activation
1Audio In: From Receiver or Telephone
Data Signal In Audio Out: To Transmitter Or Telephone
IsolationPIC Mixer
Amp Isolation
Start
Is COR HIGH?
NO
Set PTT HIGH
Is COR HIGH?
Yes
Courtesy Tones Start Hang TimeSet PTT LOW
Yes
NO
Identification/Courtesy Identification/Courtesy TonesTones
•555/556 Timer•Tone GeneratorTone Generator•PIC•Voice Chip
“W8CUL /R”
dn
2
Audio Out: To Transmitter Or Telephone
PTT
ToneGenerator
PIC
MixerAmp Isolation
Remote AccessRemote Access– DTMF TonesDTMF Tones
Valid PasswordValid Password
1 = Alternates Transmitter State “Off” - 1 = Alternates Transmitter State “Off” - “On”“On”
0 = Permanent Off0 = Permanent Off
– TelephoneTelephone
Valid Ring CountValid Ring Count
5 = Alternate Transmitter State5 = Alternate Transmitter State4-Sec
2-Sec 75 VRMS @ 20HZ
Audio In: From Receiver or Telephone
Data Signal In 3 Audio Out: To Transmitter Or Telephone
Telephone Status Telephone Control
Isolation
DTMFDecoder PIC
DTMFEncoder
MixerAmp Isolation
Isolation Isolation
Initialize Telephone Call
Possible Band-Pass Filters
Callsign ProgrammingCallsign Programming
DAH SelectControl Inputs DIT Select
SPACEENTER
PIC
Interrupt (PB7:PB4)Begin - End = ENTER
Micro-Controller vs. Micro-Controller vs. Personal ComputerPersonal Computer
• VersatileVersatile
• Low-powerLow-power
• High-SpeedHigh-Speed
• Low-CostLow-Cost
• Wide Operating Temperature RangesWide Operating Temperature Ranges
PIC16F877 System FeaturesPIC16F877 System Features
• 40-Pin CMOS Flash Microcontroller40-Pin CMOS Flash Microcontroller
• Operating Speed: DC-20MHzOperating Speed: DC-20MHz
• 10-bit Multi Channel Analog-to-Digital Converter10-bit Multi Channel Analog-to-Digital Converter
• Interrupt Capabilities = 14 SourcesInterrupt Capabilities = 14 Sources
• Temperature range: -40C to 85CTemperature range: -40C to 85C
• Three Timers (Watch Dog)Three Timers (Watch Dog)
• 256 * 8 Bytes of EEPROM256 * 8 Bytes of EEPROM
• 8K * 14 Words of Flash8K * 14 Words of Flash
• Extensive FeaturesExtensive Features
Controller Front View Control Buttons: DIT - DAH - SPACE - IDENTIFY/ENTER
9-inches
Controller Rear View
9-inches
Cinch ConnectorsFor Interface with WVU's Repeater
3-inches
Power
Identification
Red = TransmitGreen = Receive
Power TelephoneEnable
ON
OFF
ON
OFF
6-inches
6-inches
TelephoneInput
RCV TXR
3-inches
12-VDCConnector
OverviewOverview
• Complete System packageComplete System package– CompatibilityCompatibility
– SimpleSimple
– AffordableAffordable
– FunctionalFunctional
– ReliableReliable