# Link to SARL VHF, UHF & MICROWAVES DX TABLE Click here
WHY ARE OUR RADIO AMATEURS NOT EXPLORING MICROWAVES LIKE THEIR FOREIGN PEERS? – The DUBUS amateur radio magazine publishes many amateur microwave experiments that happen worldwide. It records amateur activities on Super High Frequency (SHF), 3 – 30 GHz. from countries such as Germany, UK, Spain, Italy, France, Sweden, Australia and USA etc, as well as on Extremely High Frequency (EHF), 30 – 300 GHz spectrum, and the establishment of many new records.
In earlier years a number of South African amateurs set up records on the microwave bands too that are still standing today. It all started in 1962 at East London when Arthur ZS2CK and Mike ZS2FM recorded the first microwave amateur QSO on 10 GHz (3 cm) using homebuilt klystron transceivers. With the advent of Gunn diode oscillators a spate of new microwave records were established from 1976 on microwave frequencies between 1,3 GHz and 47 GHz all on FM, which featured ZS6BNT, ZS6ML, ZS6BG, ZS6ANL, ZS6ASO, ZS6KX, ZS6BTY, ZS6BMS and ZS6AOU.
The current terrestrial microwave records on 1,3 GHz and 2,3 GHz are still held by Dave ZS6BNT and Gary ZS6ASO over 422 km and 198 km respectively. Ivo ZS6AXT and John ZS6JON established the present records on 5,7, 10 and 24 GHz over distances of 151, 299 and 56 km, respectively. The one and only record set up on 47 GHz by Arnold ZS6BMS and Julian ZS6AOU is still standing on 21,2 km. Ivo ZS6AXT pioneered EME on microwaves. His current EME records are: 1,3 GHz with WB0QMN 15 407 km; 2,3 GHz with NU7Z 16 482 km; and 5,7 GHz with W7CNK 14 745 km. Who will be next to break any of these records?
VHF NEWS FROM ZS3JPY AT KLEINZEE – Kobus v.d. Merwe, ZS3JPY, writes: “Just an update, I had a simplex QSO with Charles ZS1CF on 145,500 MHz FM in Langebaan. Now what happened was the 145,700 repeater was 58 with me while the Hamnet bulletin was on the go I reported in and said I am on 145,500 and called on 500 simplex for anyone to RX me please call. Charles came back and we had a good QSO but he said he doesn't understand what's happening, his 10 element 2m Yagi is fixed towards Table Mountain. And how is this possible that we can have a QSO. I realized that at times the repeaters in Cape Town are 59 RX/TX here with me but no simplex contacts. So is the 700 repeater antenna mounted on the side of the tower towards the Mountain and the bounced signal is reflected back to me and my RX signal is also reflected back to him. The guys beaming direct to me no RX on simplex but RX 58 via the 700 repeater good back scatter reflection one to remember on 2m simplex. 73s Kobus ZS3JPY, Cell. No.082 461 2819.”
IS CW STILL RELEVANT? – Mike K7RVX informs us that CW will get through when NOTHING else will, including all the wonderous digital modes like PSK-31. Many times he has been on 20-metre PSK when none of the waterfall signals he was seeing would print, and then drop down to 14,060 MHz and work QRP DX right off the bat. So let’s try it out on long distance VHF and see what happens.
SIMPLEX TESTS ON 145,500 MHz FM – Jaco Cronje, ZR6CMG, reports: “On Tuesday 26 April there were six stations from Pretoria active: ZS6PJH, ZR6CMG, ZS6IO, ZU6CC, ZS6EFN and ZS6ZO. Thursday 28th there were in total 13 stations active on 145,500 MHz FM and 144,300 MHz SSB. FM stations: ZS6FDK, ZS6AVH, ZS6ZO, ZS6IO, ZS6EFN, ZR6CMG, ZS6TVB, ZS6AGR, ZS6LMD. SSB stations: ZR6CMG, ZS6OB, ZS6BUN, ZS6AVH.
“Just a remainder that we will be active Tuesday and Thursday evenings from around 19:00 CAT on 145,500 MHz FM and 144,300 MHz SSB in Pretoria, West Rand and East Rand. Everyone is welcome. For more information feel free to contact me on 081 474 2220. – ZR6CMG.”
Carl Minne, ZS6CBQ says: “Well done Jaco we need someone to run a group for the guys on FM vertical. I will join the group next week when I am back home.”
HI FROM EAST LONDON – “What a poor week we are having on the S. E. Coast. I called CQ again jast night as usual, but no one was heard not even Dave ZS5DJ. Only a S3+ of noise lifting my lazy S-meter. It also does not look good, as per the Hepburn charts for the rest of the week. With the WX changing so fast propagation may take a change for the better. So keep your ears open and the radio switched on. Peter ZS2ABF.”
70 MHz NEWS UPDATE BY V51PJ – “Christo ZR6AUI finished his 4m antenna. We did a test run just now to see if he could pick up anything and yes he is hearing the pings on FM using a Neutec Ranger radio. He has to sort the microphone, PTT and speaker out first and then by tonight or tomorrow we will be able to do a test on MS using 4m FM mode with FSK441. de Pieter V51PJ.”
THE ENTIRE VEHICLE NOW BECOMES AN ANTENNA SYSTEM – High-frequency antennas transmit radio waves across vast distances and even over mountain ranges using very little energy, making them ideal for military communications. These devices, however, have one big problem: They need to be huge to operate efficiently. Instead of adding more bulk, University of Wisconsin–Madison engineers are working to increase the effective size of antennas by turning the military vehicles that carry them into transmitters—using the structures that support the antennas themselves to help broadcast signals.