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Antenna tower,
height 40 meters
Repeater antenna at the top
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Modification
of Motorola MC
Micro for PTT output.
1. Opto
4N35 "belly up", pin 4 to GND.
2.
Connect 4N35 pin 2 to pin 9 on
U704.
3.
Connect 4N35 pin 1 to 9.6 VDC
via 1K resistor.
4. Cut
connection to VR651.
5. Cut
link L--M, and connect 4N35 pin
5 to L (pin 9 on J5).
This
PTT-output (open collector) is
controlled by the microprocessor, and detects if a valid PL-tone is
received, and will not open with only a carrier, if PL-squelch is
enabled.
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Repeater Controller
Microprocessor: PIC16F648A
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UHF Repeater with VHF Crosslink
RX UHF: Motorola MC Micro, 432.6375 MHz
TX UHF: Motorola GM350, 434.6375 MHz
RX/TX VHF Link: Motorola GM350, 145.675/145.075 MHz
Remote control with DTMF, 6 channels with password protection
Repeater controller: PIC 16F648A
Antenna: Procom, CXL 70-8HD
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UHF Repeater with VHF Crosslink
Thermostat controlled heater
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UHF Repeater with VHF Crosslink
Duplex filters, 3 for RX and 3 for TX.
Heat Cable for temperature control
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UHF Repeater
New project with VHF Crossband link
Repeater controller: PIC 16F648A
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UHF Repeater
New project with VHF Crossband link
Repeater controller: PIC 16F648A
Beta version, with "Beeper" in Audio when Crosslink is active
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DTMF Controller
New project with VHF Crossband link
Remote control by DTMF, 6 channels with password protection
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UHF Repeater (Test setup)
RX: Motorola MC Micro, TX: Motorola GM350
Repeater Controller: PIC 16F648A
CTCSS Decoder with Display
Remote control by DTMF, 6 channels with password protection
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UHF Repeater (Test setup)
RX: Motorola MC Micro, TX: Motorola GM350
Output: 30 Watts after Duplex filters
Duplex filters: Rebuilt from 66-88 MHz bandpass filters
Repeater Controller: PIC 16F648A
CTCSS Decoder with Display
Remote control by DTMF, 6 channels with password protection
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UHF Repeater (Test setup)
Power Amplifier, Motorola MRF646
Gain: 3 dB (25 Watts in = 50 Watts out)
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Voting Project
RX 1 and 2: Motorola MC Micro
Voter: LDG RVS-8
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Voting Project
Remote receiver
RX and TX: Motorola MC Micro
Duplex filter: Storno
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