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

2. OUR REPEATER BLOCK DIAGRAM

3. THE PRESENT RWK REPEATER

4. BACK OF OUR REPEATER

5. THE REPEATER

6. INSIDE THE REPEATER

7. 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

8. PROGRAMMIMG THE REPEATER

9. THE CONTROLLER

10. THE CONTROLLER CIRCUIT BOARD

11. 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

12. TROUBLE SHOOTING

13. 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

14. OUR PRESENT ANTENNA

15. OUR NEW LOCATION

16. VIEW FROM THE NEW SITE

17. LIGHTNING PROTECTION and 2m / 440 DUPLEXER

18. THE BIG PROBLEM Connecting the TX / RX to the same antenna at the same time 2m / 440 dual band radios Collinear verticals Delta of 147.72/147.12 = 0.4 % Need a very special Duplexer for 2m repeaters Combination bandpass/bandreject circuit Requires very high Q circuits

19. 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 147.72 and notch 147.12 MHz TX bandpass 147.12 and notch 147.72 MHz About 95 dB isolation from BP to notch each

20. DUPLEXER RESPONSE CURVES

23. Tx

26. AD5VO TUNING THE DUPLEXER

27. RWK 6 CAVITY DUPLEXER

28. THE K5RWK REPEATER