{"id":42647,"date":"2020-04-05T08:34:28","date_gmt":"2020-04-05T12:34:28","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=42647"},"modified":"2020-04-05T08:34:28","modified_gmt":"2020-04-05T12:34:28","slug":"radio-waves-new-fcc-rf-exposure-limits-rediscovering-spark-gap-zoom-vulnerabilities-and-extremely-rare-film-of-mi6-section-viii","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2020\/04\/radio-waves-new-fcc-rf-exposure-limits-rediscovering-spark-gap-zoom-vulnerabilities-and-extremely-rare-film-of-mi6-section-viii\/","title":{"rendered":"Radio Waves: New FCC RF Exposure Limits, Rediscovering Spark Gap, Zoom Vulnerabilities, and Extremely Rare Film of MI6 Section VIII"},"content":{"rendered":"

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Radio Waves:\u00a0 Stories Making Waves in the World of Radio<\/h2>\n

Because I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest\u00a0SWLing Post<\/em>\u00a0readers.\u00a0 To that end:\u00a0Welcome to the\u00a0SWLing Post\u2019s<\/em> Radio Waves<\/em>, a collection of links to interesting stories making waves in the world of radio.\u00a0<\/strong>Enjoy!<\/strong><\/p>\n

Many thanks to\u00a0SWLing Post<\/em> contributors Paul Evans, and Robert Gulley for the following tips:<\/p>\n

\n

FCC Publishes new RF exposure rules (Federal Register)<\/a><\/h3>\n

The FCC has published the new rules in the Federal Register.<\/p>\n

Paul notes:<\/p>\n

Different above 6GHz
\nExpanding rules from 3 kHz – 300 GHz to 3 kHz – 3 THz (inc. light
\nfrequency RF sources, essentially future proofing rules)
\nIntroducing SAR measurements from 100 kHz to 6 GHz (impact to ARS)
\nIntroducing MPE measurements above 6 GHz
\nIntroducing ideas for WPT at and below 100 kHz, with control over the
\nwires or remotely over the air. This is (obviously) for EV charging.
\nThey say nothing about harmonics, filtering, etc.[…<\/a>]<\/p>\n<\/blockquote>\n

We Rediscover Spark Gap Radio by Accident (CuriousMarc via YouTube)<\/a><\/h3>\n

It’s 1890 all over again in the lab. By complete accident, I find myself the new owner of a high voltage box that turns out to be a vintage Xenon lamp sparker. Not only do we make it work, but we use it to retrace the critical experiments that led to the discovery of radio, using the lamp starter as the spark gap transmitter, and a coherer as the receiver.[..]<\/p>\n

Click here to view on YouTube.<\/a><\/p>\n<\/blockquote>\n

Zoom taking your club online – DON’T (Southgate ARC)<\/a><\/h3>\n

On Friday 3rd April, we carried an item regarding the use of Zoom for club meetings.<\/p>\n

However, we have since been contacted by Paul, VP9KF, who offers this note of caution.<\/p>\n

He says:
\n“This story\u00a0http:\/\/www.southgatearc.org\/news\/2020\/april\/zoom-taking-your-radio-club-online.htm<\/a>\u00a0on your page recently is over-shadowed by the news as follows:<\/p>\n

https:\/\/www.theguardian.com\/technology\/2020\/apr\/02\/zoom-technology-security-coronavirus-video-conferencing<\/a><\/p>\n

Don’t use Zoom and get hacked ”<\/p>\n

Our thanks to Paul for this informative, if not rather worrying, news item.<\/p>\n

[Paul notes that Skype Conference Call<\/a> is the best method because it is “secure, end to end. In browser (sandbox) with HTML5 embedded features.”]<\/p><\/blockquote>\n

WW2 Codebreakers: Bletchley Park activities revealed in unique footage – The Hidden Film (YouTube)<\/a><\/h3>\n

Discover the story behind the recently discovered only known wartime film footage of a secret site connected to Bletchley Park.<\/p>\n

A silent film, recently donated to Bletchley Park Trust, is believed to be a compilation of footage recorded between 1939 \u2013 1945, showing members of MI6 Section VIII at Whaddon Hall, Buckinghamshire. During World War Two, this was a most secret site where Ultra intelligence produced by the Government Code and Cypher School (GC&CS) at Bletchley Park would be sent, and then passed on to Allied commanders in the field.<\/p>\n

In this mini-documentary, hear Bletchley Park Veteran, Geoffery Pidgeon who worked in MI6 Section VIII during WW2, recall how it felt to watch the film for the first time and recognise his father. Peronel Craddock, Bletchley Park’s Head of Collections and Exhibitions and Dr. David Kenyon, Research Historian at Bletchley Park also talk about why the discovery of this film is so important.<\/p>\n

Watch the original footage: https:\/\/youtu.be\/bvVaFE5O3eY<\/a><\/p><\/blockquote>\n