Author Archives: Thomas

Turning the Raspberry Pi 3 B+ into a stand-alone SDR

(Source: RTL-SDR.com)

Nexmon SDR: Using the WiFi chip on a Raspberry Pi 3B+ as a TX capable SDR

Back in March of this year we posted about Nexmon SDR which is code that you can use to turn a Broadcom BCM4339 802.11ac WiFi chip into a TX capable SDR that is capable of transmitting any arbitrary signal from IQ data within the 2.4 GHz and 5 GHz WiFi bands. In commercial devices the BCM4339 was most commonly found in the Nexus 5 smartphone.

Recently Nexmon have tweeted that their code now supports the BCM43455c0 which is the WiFi chip used in the recently released Raspberry Pi 3B+. They write that the previous Raspberry Pi 3B (non-plus) cannot be used with Nexmon as it only has 802.11n, but since the 3B+ has 802.11ac Nexmon is compatible.

Combined with RPiTX which is a Raspberry Pi tool for transmitting arbitrary RF signals using a GPIO pin between 5 kHz to 1500 MHz, the Raspberry Pi 3B+ may end up becoming a versatile low cost TX SDR just on it’s own.[…]

Click here to read the full article at RTL-SDR.com.

DARC asks that you send RF polluting LED bulbs to Elektor Magazine

Photo By Trung Pham Quoc

(Source: Southgate ARC via Mike Hansgen)

LED Bulb RF Pollution – Elektor Magazine investigates

DARC, the German national amateur radio society, are requesting amateurs to send LED bulbs which pollute the RF spectrum to the magazine Elektor for investigation

A Google English translation reads:

Elektor-Verlag GmbH calls all readers and especially all radio amateurs to send non-compliant LED bulbs including power supplies. Elektor wants to investigate this EMC-technical and then forward it to the competent market surveillance of the BNetzA.

The reason for the action: As a result of a press release of the DARC in September 2017 on the significantly increasing interference of radio communications, other radio services and the DAB reception by non-EMC compliant LED bulbs Elektor had investigated such lamps (as well as LED strips). The result showed a progressive electromagnetic pollution.

The Federal Network Agency as competent authority for market surveillance in accordance with the EMVG has welcomed the call for the submission of suspicious copies. In addition, the Federal Agency would like to be informed if disturbing lamps attract attention. She then wants to investigate this situation and take the products out of the market, if they are still offered.

Please send suspicious copies

Elektor-Verlag GmbH
Kackertstr. 10
52072 Aachen

Please enclose a note with the words “EMC LED lamp” so that everything runs correctly in the inbox. You can also announce your submission via e-mail to [email protected] with the subject “EMC-LED-Lamp”. Elektor Verlag GmbH then checks the lamp, publishes an update if necessary and informs the Federal Network Agency.

Here the link to the Elektor article from 23.04.2018
https://www.elektormagazine.de/news/bundesnetzagentur-zu-schicken-sie-uns-verdachtige-led-lampen

Source DARC http://darc.de/

2017 RF pollution from LED bulbs in Elektor Magazine
http://www.southgatearc.org/news/2017/september/rf-pollution-from-led-bulbs-in-elektor-magazine.htm

New Jersey FM Pirate fined $25,000

Many thanks to SWLing Post contributor, @UlisK3LU, who notes that New Jersey pirate radio station operator, Winston Tulloch (KC2ALN), has been fined $25,000 for operating an unlicensed station on 90.9 MHz FM.  According to the FCC, the hefty penalty comes after after multiple requests to halt broadcasting starting in February 2015. The station was finally taken off the air in September 2017.

Click here to read the full FCC Notice of Apparent Liability for Forfeiture (PDF).

Video: Homebrew AM Loop Antenna Project by Thomas Cholakov (N1SPY)

Many thanks to SWLing Post contributor, Thomas Cholakov (N1SPY), who shares his latest video explaining the operation of a simple homebrew AM loop antenna:

Click here to view on YouTube.

Brilliant video, Thomas! I love the fact you included a demonstration with your SDRplay RSP1A as well. Via the spectrum display, it’s easy to see the the loop’s bandwidth and also the gain it provides when tuned to a station.

I love your AM loop antenna as well–such a simple design and ideal for demonstrating the mechanics of a passive loop antenna since all of the components are visible. I’m willing to bet you built this antenna for less than $10. Smart design as it’s both portable and effective! Keep up the excellent work, Thomas! We look forward to all of your future videos.

Final edition of Media Network Plus will air April 28, 2018

(Source: Keith Perron at PCJ Media)

After more than 500 shows. The final edition of Media Network Plus will air April 28, 2018.

While Media Network Plus is coming to an end this weekend. MNP will be retooled and will be returning as a 6 part television series.

I will be remaining as executive producer, but each program will have a different host. The new documentary format will be 25 minutes in length and will focus on one issue per program.

The first six programs are currently in production and will include the following topics.

Program 1 – With Chinese president Xi Jingping changing the constitution so he can remain in power for as long as he wants. What is this going to mean for the Chinese media of the future.

Program 2 – With the crisis with the Rohingya people on going. We will be examining the media’s role.

Program 3 – Robert Mugabe may no longer be the President of Zimbabwe. What will this mean for the Zimbabwe Broadcasting Corp. and independent media in the country.

Program 4 – A special program from Pyongyang, North Korea. With a visit to Voice of Korea. The first ever foreign TV crew allowed to visit the station.

Program 5 – Will look at how countries in East and Southeast Asia are trying to combat misleading news and information.

Program 6 – Pan-Pacific Special. This program will look at the changing media landscape across the Pacific and how new media has been a driving force in the changes to society across the region.

Air dates TBA

Transceiver discovered on Marvel’s “Agents of S.H.I.E.L.D.”

Many thanks to SWLing Post contributor, Balázs Kovács, who writes:

[Found this radio on] Marvel’s Agents of S.H.I.E.L.D. Season 05 Episode 03 (on a spaceship in the future):

Great catch, Balázs! Can anyone name this modern ham radio transceiver? Please comment!

I’ll add this post to our growing archive of radios in film.

Possible International Space Station SSTV test Wednesday

(Source: Southgate ARC)

Possible ISS SSTV on Wednesday

The latest ARISS schedule notes that the 145.800 MHz FM Slow Scan Television on the International Space Station may be tested on April 25

The callsign to be used will be RS0ISS and the SSTV test will be with Kursk in Russia and is expected to start at 0835 UT on April 25.

ARISS schedule as at April 23
http://www.amsat.org/pipermail/amsat-bb/2018-April/067782.html

When in range these WebSDRs can be used to receive the ISS on 145.800 MHz FM world-wide
– Farnham near London http://farnham-sdr.com/
– Russia R4UAB http://websdr.r4uab.ru/

ISS SSTV https://amsat-uk.org/beginners/iss-sstv/

Click here to view at the Southgate ARC.