Air Travel Chaos Looms as US Leeps 5G Altimeter Refit Deadline

Air Travel Chaos Looms as US Leeps 5G Altimeter Refit Deadline

The US will not delay a deadline for airlines to refit planes with new sensors to address possible 5G interference, despite concerns the cut-off date could cause travel disruption.

Transport Secretary Pete Buttigieg said on Tuesday that airlines were told the 1 July deadline would remain in place.

Airlines have warned that they will not be able to meet the deadline and may be forced to ground some planes.

Telecoms firms have previously delayed 5G rollout to allow airlines to adapt.

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Your MultiMeter Might be Lying to You

Your MultiMeter Might be Lying to You

Multimeters are indispensable tools when working on electronics. It’s almost impossible to build any but the most basic of circuits without one to test and troubleshoot potential issues, and they make possible a large array of measurement capabilities that are not easily performed otherwise. But when things start getting a little more complex it’s important to know their limitations, specifically around what they will tell you about circuits designed for high frequency.

The issue that often confuses people new to radio or other high-frequency projects revolves around the continuity testing function found on most multimeters. While useful for testing wiring and making sure connections are solid, they typically only test using DC. When applying AC to the same circuits, inductors start to offer higher impedance and capacitors lower impedance, up to the point that they become open and short circuits respectively. The same happens to transformers, but can also most antennas which often look like short circuits to ground at DC but can offer just enough impedance at their designed frequency to efficiently resonate and send out radio waves.

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Vacuum Tube-Making on the Comeback in the US

American-made vacuum tubes are poised to make a comeback onto the market this summer.

As the rising cost of vacuum tubes manufactured mostly in China and Russia increasingly cramps audiophiles, musicians and others seeking a particular audio quality, one factory in the US southeast is preparing to bring tube-manufacturing back home.

With assembly line workers getting down to business inside his Western Electric plant in Rossville, Georgia, entrepreneur Charles Whitener expects to restore American-made vacuum tubes to the worldwide market in just a few months. According to reports on such websites as wired.com and audioexpress.com, Whitener's goal is to resume production of the single-ended triode tube known as the 300B, a design that dates back to 1938. His plant, known as the Rossville Works, is home to the Western Electric vacuum tube brand which Whitener bought in 1995 from AT&T.

This summer he expects to introduce a reimagined version of the audio vacuum tube known as the 12AX7, a dual triode tube commonly found in amplifiers for guitars. According to Wired.com, it will be the first US-made tube in decades and it is expected to be followed by numerous other US-made models.