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CNARC REPEATER W6PWT.ORG OVERVIEW. HISTORY SITE LOCATION ACCESS TO SITE SITE STRUCTURES CNARC HARDWARE AT SITE THEORY OF OPERATION TECHNICAL ASSISTANT. HISTORY. First club repeater activated in April 1987 Details in W6PWT.org 1987 Oct. archives.
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CNARC REPEATERW6PWT.ORGOVERVIEW HISTORY SITE LOCATION ACCESS TO SITE SITE STRUCTURES CNARC HARDWARE AT SITE THEORY OF OPERATION TECHNICAL ASSISTANT
HISTORY • First club repeater activated in April 1987Details in W6PWT.org 1987 Oct. archives. • Scott Hendricks – KN6CLU purchased lot ofGas Co. RCA TACTEC comm. Equipment. • Scott buys S-Com 5K repeater controller and Jim Kennedy integrates controller with equipment. • Joe and Gwyn Magaditch pick up 2M duplexer • Repeater installed and operated in Dick Moll’s (N6CLU) home in Corona.
HISTORY 1 (cont.) • Site purchased from HV Golf Club owner. • Site developed without Norco Planning Commission approval. • Norco PC contemplated removal of site. • Scott Hendricks presented alternate plan for site usag. • Negotiations successful, ComSites USA, Inc. give city of Norco and CNARC/RACES site usage. • Provides equipment space in vault, space on tower for antennas, and access to vault power. • No charge for site power or usage ad infinitum.
HISTORY 2(cont) • Fred Roberts –W6TKV requested and obtained family permission to acquire founding member (W6PWT) call sign for CNARC repeater. • Scott and Joe work with TASMA to coordinate repeater on 147.060 KHz +, pl=142.2 hz. • Scott and Norm move repeater hardware from Dick Moll residence to permanent site on Norco Hills.
SITE LOCATION • STREET MAP • AERIAL VIEW OF SITE • ACCESSING THE SITE • ACCESSING THE VAULT
ACCESSING THE SITE • Street Address (1234 Paradise Tower Rd.). • County main gate Penetration. • If your brave , take the trip. • Now you have to open the fence gate lock. • Next, open the vault door (keyed). • Enter code on alarm pad.(hasn’t functioned for several years)
SITE STRUCTURES • ANTENNA TOWER • CNARC ANTENNAS • VAULT # 1 • VAULT #2 • EMERGENCY GENERATOR
HARDWARE AT SITE • 2 meter/440 antenna w/50 ohm coax • 1.2 GHz antenna w/hard line coax • RCA TACTEC RECEIVER • RCA TACTEC TRANSMITTER • S-COM CONTROLLER (5K MODEL) • INTERFACE LOGIC CONVERTER • 4 UNIT DUPLEXER • POWER OUTPUT ATTENUATOR • 13.8 VDC, 28 AMP POWER SUPPLY
THEORY OF OPERATION • Repeater interconnect diagram • Function of the controller • Receiver operation • Decode module • Transmitter operation • Encode Module • Function of the duplexer • Purpose of the converter box • Purpose of the attenuator • Miscellaneous Repeater information
TECHNICAL ASSISTANTNEEDED • Equipment is getting very old • Maintenance requires some technical skills • Current maintenance man is getting old • Will train qualified member to assist • Please contact KN6CV if you would like to volunteer for this position
THE END Hope you enjoyed the show, Copies of this PPS, on request Will be e-mailed to members. 73 de Norm – KN6CV
Function of the controller • Receive raw data , demodulated data from the receiver. • Decode dtmf codes, if present, and respond. • If no codes are present, pass audio on to transmitter microphone input. • Turn on transmitter via. PTT line.
Receiver Operation • Receive rf (147.660 MHz) signal from duplexer. • Detect subcarrier pl (162.2 Hz) frequency. • If pl frequency is correct, activate CTCSS and COR signal lines to controller. • Demodulate rf signal and pass it on to controller.
Decode Module • Located in receiver. • Frequency of comparator is determined by two precision resistors on the module. • If the comparator frequency is equal to the decoded sub-carrier frequency, the CTCSS line to the controller is activated.
Transmitter Operation • The transmitter is crystal controlled. • The modulator operation is performed in the plug-in crystal module. • The encode module is located in the transmitter section on the repeater. • The transmitter frequency is generated by tuning to the 12th harmonic of the crystal frequency of 12.255 MHz, i.e. 12.255x12 =147.060 MHz. • The transmitter has a 100 watt amplifier which has been set to it’s lowest level of about 10 watts.
Encode Module • The tone encoder was purchased from “Communication Specialists. Inc.”. • The model SS-32P CTCSS tone encoder is capable of generation any of 32 pll tones. • The tone is selected via. Dip switches located on the module. • The module is currently set for a frequency of 162.2 Hertz.
Function of the Duplexer • The function of the duplexer is to allow the repeater to receive (listen) and transmitt (talk) simultaneously on the same antenna. • The bandpass-reject duplexers are a product of “Wacom Products, Inc.”, model WP-641. • The repeater, controller, duplexer, antenna, and coax are all property of the Corona Norco Amateur Radio Club.
Logic Level Converter Box • The RCA transmitter requires a positive voltage to key the PTT input line. • The circuit logic converts a ground signal from the controller to a positive voltage source for the transmitter. • The COR (Carrier Operated Relay) signal from the receiver also requires the level change logic. • The CTCSS (Continuous Tone Controlled Squelch System) also required the logic level conversion.
Power Output Attenuator • When the transmitter output was set to 10 watts, a minor complaint was reported by some users in the Costa Mesa ARC. • The attenuator was inserted in the power output line to limit the power to approx. 4 watts. • No further complaints have been reported. • The attenuator is a resistive device that is designed to reduce the power output level while maintaining the 50 ohm line impedance.
Miscellaneous RepeaterInformation • Common power supply (13.8 VDC @ 28 A), input from vault supply (120 VAC w/emergency backup generator). • Spare repeater parts available. • Schematic drawings are available. • Scom 5K Controller manual available. • Repeater operates 24/7 and is an open system.
D DUPLEXER D
