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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 repeater w6pwt org overview

CNARC REPEATERW6PWT.ORGOVERVIEW

HISTORY

SITE LOCATION

ACCESS TO SITE

SITE STRUCTURES

CNARC HARDWARE AT SITE

THEORY OF OPERATION

TECHNICAL ASSISTANT

history
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
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
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
SITE LOCATION
  • STREET MAP
  • AERIAL VIEW OF SITE
  • ACCESSING THE SITE
  • ACCESSING THE VAULT
accessing the site
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
SITE STRUCTURES
  • ANTENNA TOWER
  • CNARC ANTENNAS
  • VAULT # 1
  • VAULT #2
  • EMERGENCY GENERATOR
hardware at site
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
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 assistant needed
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
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
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
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
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
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
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
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
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
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 repeater information
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.
slide23
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DUPLEXER

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