# Link to SARL VHF, UHF & MICROWAVES DX TABLE Click here
PY1MHZ IS MONITORING ZS SIGNALS ON 144,300 MHz – Pieter V51PJ informed us that Marcos Turbo, PY1MHZ, has installed his 2x12 element LFA Yagis at Rio de Janeiro and are fixed in our direction. He is now monitoring 144,300 MHz SSB and also V51PJ beacon on 144,429 MHz. The next Transatlantic transmitting two-way tests between Namibia and Brazil will start gain in August 2016, because currently only cold fronts are experienced on both sides. Beacon signals exceeding 4000 km have been recorded across the Atlantic Ocean. The distance between Brazil and South Africa is about 6000 km and is the biggest challenge facing VHF amateurs at present. This amateur science project will stimulate amateur radio technology.
All 50 MHz BEACONS ABOVE 50,031 – 50,100 MHz WILL HAVE TO MOVE – The IARU is implementing new rules and allocations for beacons on the 50 MHz band, which were proposed by the RSGB. The old beacon band from 50,000 – 50,100 MHz will now become exclusively Telegraphic (CW), except for the bottom section between 50,000 to 50,030 MHz, which will be sbared by DX beacons from Regions 1, 2 and 3. The new beacon band is allocated from 50,400 – 50,500 MHz. Maybe Dennis ZS4BS could give us an idea when the deadline is for the above.
ZS6WAB VHF BEACONS ARE BACK ON THE AIR – Wlllem Badenhorst, ZS6WAB, at Polokwane Locator KG46rb announced that his VHF beacons are back on the air. They are: 144,410 MHz CW and 70,025 MHz CW. On 16th May 2016 Carl Minne, ZS6CBQ, reported hearing the 144,410 MHz beacon at 5/1 in Krugersdorp.
NEWS FROM NAMIBIA – Pieter Jacobs, V51PJ, at Rosh Pinah reported that ZS2ACP Andre and ZR6AUI Christo were the first on 50 MHz MS digital. Then Pieter and Christo worked each other on both 50 MHz and 70 MHz MS. While they were operating digital on 50 MHz a Tropo opening occurred towards Division 6 as the Sun was warming up the cold air above the clouds and changing the dewpoint to make possible long distances with low power on VHF.
THE ZS1 VHF GROUP IS BACK ON THE AIR – “Last night’s net on 144,300 MHz: ZS1K, ZS1TAF, ZSGVW, ZS1TK and ZS1PDY. ZS1CF in Langebaan attempted to get inbut conditions were poor…. Don’t give up Charles! 73 de Mike ZS1TAF. Email: email@example.com Mobile & WhatsApp: 076 278 5622.”
THE NEW PHASE-CHANGE MEMORY (PCM) – Scientists at IBM Research have demonstrated reliably storing 3 bits of data per cell using a relatively new memory technology known as phase-change memory (PCM). The current memory landscape spans from venerable DRAM to hard disk drives to ubiquitous flash. But in the last several years PCM has attracted the industry's attention as a potential universal memory technology based on its combination of read/write speed, endurance, non-volatility and density. For example, PCM doesn't lose data when powered off, unlike DRAM, and the technology can endure at least 10 million write cycles, compared to an average flash USB stick, which tops out at 3,000 write cycles.
To store a '0' or a '1', known as bits, on a PCM cell, a high or medium electrical current is applied to the material. A '0' can be programmed to be written in the amorphous phase or a '1' in the crystalline phase, or vice versa. Then to read the bit back, a low voltage is applied. This is how re-writable Blue-ray Discs store videos. Previously scientists at IBM and other institutes have successfully demonstrated the ability to store 1 bit per cell in PCM, but today at the IEEE International Memory Workshop in Paris, IBM scientists are presenting, for the first time, successfully storing 3 bits per cell in a 64k-cell array at elevated temperatures and after 1 million endurance cycles.
LATE NEWS! AS FROM 22 MAY MARS WILL RISE AFTER SUNSET – The planet Mars will rise after sunset as from 22 May 2016 and reach opposition on 30 May. It will be the closest to Earth since 2003 at a distance of 75,3 million kilometres, and appear as a bright orange/red disc. Its two moons, Phobos and Deimos, should be visible through binoculars or a small telescope.