THE K5RWK REPEATER THE K5RWK REPEATER HOW IT WORKS By F Cummings, W5LQU August 2009.

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Presentation transcript:

THE K5RWK REPEATER THE K5RWK REPEATER HOW IT WORKS By F Cummings, W5LQU August 2009

OUR REPEATER BLOCK DIAGRAM

THE PRESENT RWK REPEATER

BACK OF OUR REPEATER

THE REPEATER

INSIDE THE REPEATER

PROGRAMMING THE REPEATER The repeater is programmed using a PC There are 8 possible channels we set up 4 Set RX and TX frequencies Set timers for hang time and time out Set TX power out and RX squelch Set CTCSS tones if needed for TX and RX

PROGRAMMIMG THE REPEATER

THE CONTROLLER

THE CONTROLLER CIRCUIT BOARD

PROGRAMMING THE CONTROLLER The controller is programmed using DTMF tones through the RX Set various control operator functions Set the normal voice ID and CW ID Set timers for hang time and time out Set the time out message Set the courtesy tones

TROUBLE SHOOTING

2M DB224 ANTENNA A DB224 antenna with 4 vertically stacked folded dipoles which can be connected to form an omni or eliptical pattern with about 6 to 8 dB gain

OUR PRESENT ANTENNA

OUR NEW LOCATION

VIEW FROM THE NEW SITE

LIGHTNING PROTECTION and 2m / 440 DUPLEXER

THE BIG PROBLEM Connecting the TX / RX to the same antenna at the same time 2m / 440 dual band radios Collinear verticals Delta of / = 0.4 % Need a very special Duplexer for 2m repeaters Combination bandpass/bandreject circuit Requires very high Q circuits

RWK DUPLEXER BP/BR vs LP/HP 6 quarter wave cavities – 3 TX and 3 RX 1 BP and two BP/notch cavities each RX bandpass and notch MHz TX bandpass and notch MHz About 95 dB isolation from BP to notch each

DUPLEXER RESPONSE CURVES

Tx

AD5VO TUNING THE DUPLEXER

RWK 6 CAVITY DUPLEXER

THE K5RWK REPEATER