Category: Microwave

Via HACKADAY: Retrotechtacular: 934 MHz CB Radio

The radio spectrum is carefully regulated and divided up by Governments worldwide. Some of it is shared across jurisdictions under the terms of international treaties, while other allocations exist only in individual countries. Often these can contain some surprising oddities, and one of these is our subject today. Did you know that the UK’s first […]

via the RSGB: Sweden to discontinue 2.3 and 3.4GHz permits

Amateurs in Sweden have been able to apply for temporary permits to allow operation in 2.3GHz and 3.4GHz bands. Their regulator, the PTS, has announced these temporary permits will no longer be issued from 1 January 2020. The reason is 5G. Swedish amateurs are presently permitted by their regulations to run a maximum of 100mW […]

Via the ARRL: ARRL to Oppose Proposal to Eliminate 3.3 – 3.5 GHz Amateur Allocation

At its December 12 open meeting, the FCC will consider adopting a Notice of Proposed Rulemaking (NPRM) that proposes to remove the amateur radio 9-centimeter allocation at 3.3 – 3.5 GHz. ARRL plans to comment in opposition to the proposed action. According to an FCC “Fact Sheet,” the proceeding WT Docket 19-348, “Facilitating Shared Use in the 3.1 […]

Via the ARRL: Inter-American Proposal Removes 47 – 47.2 GHz from Bands under Study for 5G Services

The 34th meeting of the Inter-American Telecommunication Commission (CITEL) Permanent Consultative Committee II (PCC.II) concluded a week of meetings on August 16 in Ottawa, Canada, in advance of World Radiocommunication Conference (WRC-19). The meetings were aimed at reaching regional consensus on WRC-19 agenda items. Attendees at PCC.II included ARRL Technical Relations Specialist Jon Siverli… Read […]

via the ARRL: Australian Radio Amateur Reports First FT8 Contact on 122 GHz

In Australia, Roland Lang, VK4FB, and Stefan Durtschi, VK4CSD, completed what is being claimed as the world’s first FT8 contact on 122 GHz. The distance spanned during the August 11 contact was 92.08 kilometers (approximately 57.1 miles). Signals were –17 dB on one end, and –20 dB on the other. Earlier this summer, VK4FB and […]

via the RSGB: Australians set new microwave records

The Wireless Institute of Australia (WIA) reports that new records have been set on the 47GHz and 122GHz bands. Operating 47GHz mobile, David, VK5KK and Wayne, VK5APN set a new record of 20.8km on 11 March 2019. At 122GHz, Matt, VK2DAG and David, VK2JDS set a new VK2 state record of 100m. Although this is some way short […]

via the ARRL: FCC Adopts New Rules for Spectrum above 95 GHz in Branded “Spectrum Horizons” Initiative

The FCC has adopted new rules to encourage development of new communication technologies and expedite the deployment of new services above 95 GHz. The action was the latest move in the Commission’s “Spectrum Horizons” branded initiative. “This spectrum has long been considered the outermost horizon of the usable spectrum range, but rapid advancements in radio technology have […]

via the ARRL: IARU Region 1 Editorial Sounds Clarion Call on Danger VHF/UHF/Microwave Spectrum Grabs

The chair of the International Amateur Radio Union Region 1 (IARU R1) VHF-UHF-µW Committee, Jacques Verleijen, ON4AVJ, has highlighted extant threats to the Amateur Radio spectrum above 30 MHz. In an editorial that heads the latest edition of the IARU R1 VHF-UHF-µW Newsletter, issued on May 29, Verleijen invited all IARU member-societies to consider ways to “promote, […]

via the ARRL: ARRL Asks FCC to Protect Amateur Radio Millimeter-Wave Bands

ARRL has asked the FCC to avoid authorizing developmental technologies in two Amateur Radio bands above 95 GHz that some radio amateurs may not be unaware of. The ARRL commented on May 2 in response to a Notice of Proposed Rule Making and Order (NPRM&O) in ET Docket 18-21, released in February. The so-called “Spectrum Horizons” proceeding seeks to […]

via HACKADAY: Teardown Of An UWB Location Beacon

Outdoor navigation is a problem that can be considered solved for decades or maybe even centuries, depending on the levels of accuracy, speed and accessibility required. Indoor navigation and location, on the other hand, is a relatively new field and we are still figuring it out. Currently there are at least four competing technologies pushed […]

via the ARRL: NTIA Targets Portion of 3.4 GHz Band for Potential Wireless Broadband Use

The National Telecommunications and Information Administration (NTIA) has identified 3450 to 3550 MHz for potential wireless broadband use. Amateur Radio has a secondary allocation of 3300 to 3500 MHz, sharing the spectrum with government radars; the popular “weak-signal” frequency is 3456.1 MHz. The NTIA oversees the use of spectrum by federal government agencies. “America is […]

via the ARRL: VFlorida Weak Signal Society 3.4 GHz Beacon Back on the Air

The Florida Weak Signal Society (FLWSS) reports that its beacon on 3,456.075 MHz is back on the air and invites reports. The FLWSS said all of its beacons, located in EL98 in the Orlando area, are subject to some drift with temperature; each operates independently with its own crystal reference. “We can’t provide individual frequency accuracy, but […]

via the ARRL: Microwavers Report Successful US-Canada Contacts on 78 GHz

Microwave enthusiast Mike Seguin, N1JEZ, has reported several successful 78-GHz contacts between the US and Canada on November 9. “We believe these contacts may be the first W/VE on 78 GHz,” Seguin said in a post to several VHF/UHF/microwave-oriented reflectors. “We hope to extend distances before winter sets in here in the Northeast and mountaintop access […]

Meet the Geek Who Tracks Rogue Satellites With Coat Hangers

EVERY 95 MINUTES, the Chinese satellite Zhuhai-1 02 makes a full pass around the planet, its solar-panel arms extending from its boxy body as it observes Earth. Sometimes, its path takes it over Pueblo, Colorado. There, more than 300 miles below, Mike Coletta’s receiving station can pick up Zhuhai’s transmissions. Because as sophisticated as space technology is, the […]

via the ARRL: New 10-GHz Earth-Moon-Earth World Record Set

A new 10-GHz Earth-Moon-Earth (EME or moon bounce) world record has been set. On September 9, Rex Moncur, VK7MO, and Jim Malone, WA3LBI, completed a 18,949.4-kilometer contact using QRA64D. This extends by approximately 600 kilometers the previous world record of 18,337 kilometers held by DL7FJ and ZL1GSG, who used CW. The participants said the key […]

via HACKADAY: Doppler Module Teardown Reveals the Weird World of Microwave Electronics

Oscillators with components that aren’t electrically connected to anything? PCB traces that function as passive components based solely on their shape? Slots and holes in the board with specific functions? Welcome to the weird and wonderful world of microwave electronics, brought to you through this teardown and analysis of a Doppler microwave transceiver module. We’ve […]

Amateur Radio Poised to Retain Full 76-81 GHz Band, Sharing with Vehicular Radars

In a draft Report and Order (ET Docket No. 15-26) to be considered at its July 13 open meeting, the FCC is proposing to lift a nearly 2-decade-old suspension of Amateur Radio access to 76-77 GHz, giving the Amateur and Amateur-Satellite services access to the full 76-81 GHz band on a secondary basis. The FCC […]