immmimimi Novice Notes Drew Diamond VK3XU Lot 2. Carters Road, Wonga Park. Vic. 3115 NEW TIME CODE FOR VNG

MINUTE PULSE

MINUTE identifier SECONDS MARKERS NORMALLY 50ms. OF 1000Hz SECONOS MARKERS SS-58 ARE 5ms OF 1000Hz SECONDS MARKER 59 OMITTED. MINUTE MARKER IS 500ms. OF 1000Hz. DURING 5th,10th, 15th ETC SECONOS MARKERS 50- 58 ARE 5 ms. Of 1000 Hz. NORMAL SECONDS MARKERS OF 50ms OF 1000 Hz EMPHASISED BY 50ms. OF 900Hz TONE IMMEDIATELY FOLLOWING

SECONOS MARKER 20 200 ms DURATION. DESIGNATES THE START OF THE TIME INFORMATION.

TIME CODE TRANSMISSION

/BINARY "0"- 100ms. DURATION \BINARYT — 200ms. DURATION

PARITY CHECK BITS P,, P2 ,P3 COUNTING BINARY "ONES" OF EACH GROUP PLUS THE CORRESPONDING PARITY ST GIVES AN EVEN NUMBER VNG TIME CODE FORMAT VNG Time Coda Format.

A short wave standard frequency and time completely every minute. signal broadcasting service VNG has operated For maximum security under marginal re- REGION 2 Conference from Radio Lyndhurst, Victoria, for 20 years. In commemoration of the IARU Region 2 ception conditions, the so-called "slow code" Conference, which will be held in Buenos Aires Telecom Research Laboratories were respon- at a bit rate of one Hertz has been adopted, the from October 20-25, 12 local radio clubs in sible for the establishment of the service and complete information thus extending over most Argentina will be operating special event stations continue to maintain the carrier frequencies of one minute. The low transmission rate also signing AZ1ARU/1; AZ1ARU/2 ... AZ1ARU/12. arid instant of time, as transmitted, to within permits decoding by the use of simple re- The operations will continue until October 31. close tolerances of the Telecom (ATC) Standard corders. QSL cards for AZ1ARU/5 should go to LU6FAZ. of Time and Frequency operated at the Clayton As VNG has Australia-wide coverage, the QSL informationfor th e other 11 stations is, as yet, Laboratories complex. upgraded time service will have many new unknown. An updating of the broadcast time code applications where HF radio reception is the From The AfWL Lemr May 23,1986 format has been implemented which adds time only convenient source of accurate time infor- of day and day number of the year information WHAT TIME IS IT? mation. Such applications include surveying, There are many interesting stations to listen for without alteration to the existing minute, five- data logging, telemetry systems and shipping. when you want to catch the time: WWV from Fort minute and 10-minute identifying sequences or The method of encoding used complies with Collins, CO on 2.5; 5; 10; 15; and 20 MHz — DUT1 coding. The DUT1 Code relates the CCIR recommendations for Time Codes and is WWVH from Hawaii on 2.5; 5; 10 and 15 MHz — deviation between the Earth's angular position similar to the "slow codes" transmitted from JJY from Tokyo on 2.5; 5; 8; 10 and 15 MHz — time scale UT1 and the Co-ordinated Universal the standard frequency and time signal CHU from Ottawa on 3.330; 7.335 and 14.670 MHz Time Scale UTC. stations MSF at Rugby in England and DCF77 — VNG from Lyndhurst, Australia on 4.500; 7.500 The addition of this extra information in near Frankfurt, West Germany. and 12.000 MHz — OLB5 from Czechoslovakia on binary-coded-decimal (BCD) form, will enable The new code has been on air since May 14, 3.170 MHz — VWC from Calcutta on 12.744 MHz time code receivers to operate directly from the 1986 and has created renewed interest in the — and DOA from the Federal Republic of received signal by decoding the pulse se- VNG service provided by Telecom. Germany on 2.775 and 12.763 MHz. quences and updating a receiver's time output From The ARRL Letter May 23,1966

Page 26 - AMATEUR RADIO, August 1986