Tag: frequency

via the ARRL: ARRL Comments in “Strong Opposition” to Part 15 Modification Petition Affecting 5 GHz

ARRL has commented in “strong opposition” to a Petition for Rulemaking by RADWIN Ltd. that seeks to amend certain Part 15 rules to permit point-to-multipoint (P2MP) communication services in portions of the 5 GHz band, at power levels now permitted only for point-to-point unlicensed systems. ARRL has focused its concern on proposed high-power P2MP operation in the band 5.725 […]

via HACKADAY: Ask Hackaday: Is Your Clock Tied to Mains Frequency?

Earlier in March we heard about a quirk of the interconnected continental European electricity grid which caused clocks to lose about six minutes so far this year. This was due to a slight dip in the mains frequency. That dip didn’t put anything out of commission, but clocks that are designed to accumulate the total zero-crossings of […]

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: Revised ARRL Frequency Chart Now Available

An updated ARRL frequency chart is now available for printing and downloading at http://www.arrl.org/graphical-frequency-allocations. The chart has been updated to include our new bands at 2,200 and 630 meters. The new chart is available in the following PDF formats: ● 8.5 X 11 grayscale ● 8.5 X 11 black and white ● 8.5 X 11 color […]

FCC adopts Montville resident’s proposal (Connecticut)

Montville business owner Joe Ciaudelli is receiving national recognition again, this time from the Federal Communications Commission. Ciaudelli is the CEO of Rayvel Inc., a Montville-based company that specializes in electromagnetic wave technology. In 2015, the company received a patent for its wide-angle hologram technology. This month, Ciaudelli’s most recent proposal was adopted by the […]

Updated ARRL “US Amateur Radio Bands” Charts Now Available

ARRL has revised and updated its “US Amateur Radio Bands” charts, and these now are available for download. These are PDF documents, available in color or grayscale presentations. The revised charts reflect the new 630- and 2,200-meter bands, but also emphasize that these bands are not yet available for Amateur Radio use. The effective date […]

PODCAST: This Week in Amateur Radio #950

This Week in Amateur Radio #950 Week of May 13, 2017 DOWNLOAD HERE: http://bit.ly/TWIAR950 Running Time: 1:03:14 Here is a summary of the news trending This Week in Amateur Radio. This is for Edition #950 with a release and air date of Saturday, May 13, 2017. This weeks program was produced and edited by George […]

via HACKADAY: Understanding The Quartz Crystal Resonator

Accurate timing is one of the most basic requirements for so much of the technology we take for granted, yet how many of us pause to consider the component that enables us to have it? The quartz crystal is our go-to standard when we need an affordable, known, and stable clock frequency for our microprocessors […]

via HACKADAY: Very Simple PC Frequency Counter Works Up To 100MHz

We all use 74 logic in our projects as general purpose logic interfacing glue. These chips have become as ubiquitous as a general-purpose op-amp, or even as passive components. In most cases we’re not demanding much of them, and power requirements aside an original 74 chip from the dawn of the series could probably do the […]

via the ARRL: New European Table of Frequency Allocations Released

A new edition of the European Table of Frequency Allocations in the range 8.3 kHz to 3000 GHz has been released. The table is maintained by the European Conference of Postal and Telecommunications Administrations (CEPT) Working Group Frequency Management. via American Radio Relay League | Ham Radio Association and Resources http://ift.tt/2axhCxZ

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