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The DARC Repeaters
ANY QUERIES ADDRESS TO: REPEATERS. DARC. 17 BROWNLEE PLACE. BLUFF. 4052. TELEPHONE: 031-4677357. The 145.650 Repeater The BK9PKP repeater is one of the 5 repeaters origionally licenced early in 1970. AMATEUR REPEATER. (VOICE) ZU9PKP. LICENCE NUMBER:418-312-9 REGION CODE:20886 ALLOCATION:0026 FREQUENCIES. RX 145,050/TX 439.00 MHz. THIS REPEATER WAS CONVERTED TO 12,5khZ CHANNEL SPACING WHEN REGULATIONS FIRST CAME ABOUT. WOODLANDS WATER TOWER. GPS: 30:51:00 E 29:55:00 S. KENYON HOWDEN ROAD. RX. STORNO TYPE 614.+ UHF TX STORNO TYPE 661 FREQUENCIES. TX 145,650/RX 439,00MHz BLUFF WATER TOWER. GPS: 31:00,7 E 29:55,6 S. BLUFF ROAD. TX. STORNO TYPE 614 + UHF RX STORNO TYPE 661. POWER OUTPUT 10 WATTS. NOTE: SPLIT RECEIVER AND TRANSMITTER. VHF RECEIVER ON WOODLANDS TOWER, TRANSMITTER 11 KILOMETERS AWAY ON THE BLUFF WATER TOWER. AUDIO AND SWITCHING FEED BETWEEN THE TWO SITES BY UHF, FREQUENCY 438,375 MHz. POWER 2 WATTS. ADDITIONAL UHF RECEIVER PORT INSTALLED AT VHF TRANSMITTER. INPUT FREQUENCY ALLOTTED 438,450 MHz. THIS REPEATER IS REMOTE CONTROLLED AS PER LICENCE REQUIREMENTS,(ON/OFF ETC.)BY ZVEI TONES. RESPONSIBLE PERSON: L. DE BRUIN. ZS5LP. Ph: 031-4677357 THE ABOVE REPEATER INSTALLATIONS PROVIDED FOR LOW RF LOSSES NEEDING ONLY 8 METRES COAX CABLES. A NOTCH FILTER IS NECESSARY AS A COMMERCIAL REPEATER ON THE SAME SITE COULD CAUSE INTERMOD PROBLEMS. THE TOTAL RF LOSS IN THE SYSTEM IS HOWEVER KEPT TO JUST OVER 1,2dB. THE VHF ANTENNA, A CO-LINEAR, WAS SPECIALLY DESIGNED FOR THE REPEATERS FOR MAXIMUM RADIATION LOBES AS REQUIRED IN THE HILLY TERRAIN LOCALLY, REQUIRING SIGNALS ABOVE THE HORIZON. THE RECEIVE STATION IS 106 METRES ABOVE SEA LEVEL WHILE THE TRANSMIT STATION IS 88 METRES ABOVE THE SEA. BOTH VHF ANTENNAS THUS MUST FIRE 5 TO 10 DEGREES UPWARDS BOTH AT THE TRANSMIT STATION AND THE RECEIVE STATION. A 4 ELEMENT BEAM AT EACH SITE BEAMED RX - TX IS INSTALLED. UHF OPERATES AT >2 WATTS. THE RECEIVER HAS SOME UNIQUE DESIGNS INCORPORATED BY ZS5LP. 1) THE SQUELCH SYSTEM WAS REDESIGNED TO ASSIST IN ELIMINATING INTERFERENCE PREVALENT AT THE HIGH SITE ON WHICH THE 650 REPEATER IS INSTALLED. 2) THE INTERFACING BETWEEN THE RECEIVER AND TRANSMITTER IS ALSO DESIGNED FOR CONDITIONS PREVAILING. 99% OF THE INTERFERENCE CONSISTS OF PULSES OR AMPLITUDE SPIKES OF SHORT DUTATION, THUS A 1,8 SECOND DELAY IS INCORPORATED IN THE UHF TO VHF TRANSMITTER SITE. THIS MAKES THE REPEATER A “SLEEPING SYSTEM”. TO ACTIVATE THE SYSTEM THE OPERATOR WILL GIVE HIS CALL SIGN TWICE, OR A CARRIER EXCEEDING 1,8 SECS, THUS SWITCHING ON THE VHF TRANSMITTER, AND OPERATION WILL BE CONCENTIONAL. A TAIL, CARRIER, OF 7 SECONDS DURATION IS INSTALLED. THIS SERVES MANY PURPOSES. A) IF USING A HANDHELD OR BEING MOBILE THE TAIL (TRANSMITTER ON) ALLOWS SUFFICIENT TIME FOR THE OPERATOR TO ESTABLISH A “GOOD” SPOT, BY NOTING THE “S” METER STRENGTH. B) THE UNWANTED NOISE “KERCHUNK” CAUSED BY THE RX/TX SWITCHING ON/OFF, (NO TAIL,) SYSTEMS IS NOW ELIMINATED AND LEFT TILL END OF THE TAIL WHEN THE REPEATER DROPS OUT. THIS IS IMPORTANT WHEN OPERATING ON RECORDING, “INTECNET” OR SIMILAR NETS.
The 145.725 Repeater
ZU9QKB. (AS SOON AS TRAFFIC DEMANDS THIS REPEATER WILL BE ACTIVATED.) SYSTEM TO OPERATE ON SPLIT SITE OPERATION AS FOR 145,650 MHz. UHF FREQUENCY ALLOCATED, 438,300 AND EXTRA PORT 438,500 MHz. THIS SYSTEM WILL BE INSTALLED AS PER THE 650. (REFER CORRESPONDENCE AND AUTHORIZATION OF THE ALLOCATION OF 4 UHF CHANNELS WITH JOHN FIELDING, THE “THEN” VHF BAND PLANNER AND CO-ORDINATOR.) AMATEUR REPEATER (VOICE.) ZU9QKB LICENCE NUMBER:416-313-7 REGION CODE:20886 ALLOCATION:0026 FREQUENCIES. RX 145,125 TX 145,725 MHZ. DURBAN NORTH WATER TOWER. GPS: 31:02:00 E 29:45:00 S. UMLHANGA ROCKS DRIVE. RX/TX STORNO TYPE 614. POWER OUTPUT 10 WATTS. UHF CHANNELS: 438,00MHz, WITH EXTRA PORT 438,500 MHz. OUTPUT POWER APPROXIMATELY 4 WATTS. UHF 4 ELEMENT BEAM ANTENNAS. CONVERTED TO 12,5khZ SPACING. RESPONSIBLE PERSON: L. DE BRUIN. ZS5LP. PH: 031-4677357. |
The 434.700 Repeater
AT PRESENT DURBAN AREA HAS AN ABUNDANCE OF UHF REPEATERS. THE FOLLOWING DARC UHF REPEATER HAS BEEN SWITCHED OFF, THE LICENCE IS MAINTAINED. THE SWITCH ON IS PENDING NEW IDEAS. AS SOON AS THIS SYSTEM IS RESURRECTED IT WILL BE RESTORED TO THE SITE SPECS AS PER DETAILS SHOWN. AMATEUR REPEATER. (VOICE) ZU9QKC LICENCE NUMBER:417-165-9 REGION CODE:20886 ALLOCATION:0026 FREQUENCIES RX 433.100 TX 434,700 MHZ DURBAN NORTH WATER TOWER. GPS: 31:02:00 E 29:45:00 S. UMLHANGA ROCKS DRIVE. RX/TX STORNO TYPE 661 POWER OUTPUT 8 WATTS. RESPONSIBLE PERSON: L. DE BRUIN. ZS5LP. PH: 031-4677357. The 144.675 Digipeater THE DARC DIGIPEATER, ZS0SPF IS AT PRESENT BEING UPGRADED TO INCLUDE APRS AND A POSSIBLE “DX CLUSTER”. AN UPGRADED P.C. WILL BE PROGRAMMED TO THE LATEST TECHNOLOGY. THE DIGIPEATER WILL BE INSTALLED AND OPERATED FROM THE UNIVERSITY OF KWA-ZULU NATAL EARLY IN 2007. SYSOP DAVE ZS5LPT. THIS AN EXCELLENT RADIO SITE WITH A 360 DEGREE HORIZON ANTENNA: A CO-LINEAR WITH CO-AX FEED LENGTH OF 11 METRES. ANTENNA HEIGHT 8 METRES. AMATEUR - DIGIPEATER/PACKET/BULLETIN BOARD. ZS0SPF LICENCE NUMBER:418-692-8 REGION CODE:20886 ALLOCATION:0026 FREQUENCY. RX/TX 144,675 MHZ. SHINWA VHF TX/RX. POWER: 15 WATTS. GPS: 31:00,7 E 29:55,6 S. RESPONSIBLE PERSON: CHAIRMAN DARC. PH: 031-4677357. ZS5D. UNRESTRICTED. LICENCE NUMBER:420-170-1 REGION CODE:41803 ALLOCATION:0026 CHAIRMAN. DARC. PH: 031-4677357. DURBAN AMATEUR RADIO CLUB HOUSE. MONTCLAIR. GPS: 30:59,8 E 29:59,00. REPEATER KEEPER: LOUIS DE BRUIN. ZS5LP. Club Contact details: 17 Brownlee Place, Bluff, Durban, 4052 or |