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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
