Tag: experimenters

via the RSGB: Access to 71MHz driving innovation

UK amateurs continue to make remarkable progress with innovative technology in the experimental 71MHz band. The BATC forum reports contacts of reduced bandwidth digital amateur TV of between 59 and 87km, using the latest high efficiency video coding. This follows the initial short range contacts when simplified NoV access to 70.5-71.5 MHz was introduced by Ofcom and […]

via HACKADAY: Portable Ham Radio Design Fosters Experiments

[Charlie Morris] has been busy building a portable ham radio rig and documenting his progress in a series of videos. You can see the first one below. There’s four parts (more if you count things like part 4 and part 4a as two parts) so far and it is always interesting to see inside a […]

via the ARRL: Experiments Look to Leverage Low-Latency HF to Shave Microseconds off Trade Times

Experimental operations now under way on HF appear aimed at leveraging low-latency HF propagation to shave microseconds from futures market trades and gain a competitive edge in a field where millionths of a second can mean winning or losing. Bloomberg on June 18 reported on a secretive antenna facility near Maple Park, in Kane County, Illinois, and speculated that […]

via HACKADAY: SDR IF Experiments

The R820T tuner IC is used in the popular Airspy software defined radio (SDR) as well as many of the inexpensive RTL SDR dongles. [TLeconte] did some experiments on intermediate frequency (IF) configuration of the chip, and you’ll find his results interesting. Using 5 million samples per second and the device’s real mode, the tests look at […]

via HACKADAY: Fallen Radiosonde Reborn as Active L-band Antenna

If your hobby is chasing radiosondes across vast stretches of open country, and if you get good enough at it, you’ll eventually end up with a collection of the telemetry packages that once went up on weather balloons to record the conditions aloft. Once you’ve torn one or two down though, the novelty must wear […]

via HACKADAY: Why is Donald Duck on the Radio? Math Behind Single Sideband Explained

AM, or amplitude modulation, was the earliest way of sending voice over radio waves. That makes sense because it is easy to modulate a signal and easy to demodulate it, as well. A carbon microphone is sufficient to crudely modulate an AM signal and diode — even a piece of natural crystal — will suffice […]

via the ARRL: Tiny LF Signal Makes the Hop from Newfoundland to the UK

For Joe Craig, VO1NA, in Torbay, Newfoundland, things have been pretty exciting lately on VLF (very low frequency). He’s among the early MF, LF, and VLF experimenters in North America — active even before Canada allocated Amateur Radio bands in that part of the spectrum. He believes he accomplished a “first” for a Canadian radio […]

via the ARRL: New Ham Bands Spring to Life; Veteran LF Experimenter Denied Amateur Access to 2200 Meters

Amateur Radio’s two newest bands came to life on Friday the 13th. Both 630 meters (472-479 kHz) and 2200 meters (135.7-137.8 kHz) now are available to radio amateurs who have notified the Utilities Technology Council (UTC) of their intention to operate and did not hear anything back during the ensuing 30 days. “Many of us […]

Band Plan Proposed for Eventual 472-479 kHz Use

ARRL 630-Meter Experiment Coordinator Fritz Raab, W1FR, has proposed an informal band plan for the pending 472-479 kHz band. Raab said that once US radio amateurs are granted access to 630 meters, he would move stations operating under the blanket WD2XSH FCC Experimental (Part 5) license to 461-472 kHz. “This will clear the amateur frequencies, […]

HAARP Experiments to Get Under Way on February 20 UTC, Reports Invited

On February 20 (UTC), Alaska’s High Frequency Active Auroral Research Program (HAARP) will launch its first scientific research campaign since the facility was taken over by the University of Alaska Fairbanks (UAF) Geophysical Institute 18 months ago. UAF Space Physics Group Assistant Research Professor Chris Fallen, KL3WX, reports that he will be ready to go […]

ARRL Reintroduces a Popular Classic — Experimental Methods in RF Design

ARRL has reintroduced the popular title Experimental Methods in RF Design as a classic reprint edition. Immerse yourself in the communications experience. Build equipment while understanding basic concepts and circuits. “This is a…classic, extremely good text on designing circuits for the ham,” ARRL Life Member Bob De Varney, W1ICW, a professional radio communication technician and […]

HamSCI Members Showcase Amateur Radio-Related Research at AGU Fall Meeting

Ham Radio Science Citizen Investigation (HamSCI) scientists were among those taking part in the fall meeting of the American Geophysical Union (AGU) in San Francisco earlier this month. The December 11-17 gathering, which attracted some 24,000 geoscientists, offered an opportunity for HamSCI scientists to present Amateur Radio-based research, discuss possibilities for upcoming experiments, and network […]

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