Hidden Morse Code in Tubular Bells

MadPsy : October 31, 2021 23:32 : Audio, Electronics, Radio

The link between The Exorcist, Amateur Radio and Alan Turing.

A quick look at how the movie The Exorcist from 1973 has links to the late great Alan Turing via Mike Oldfield’s album Tubular Bells, Scotland and Amateur Radio. It’s Halloween so figured why not throw some horror in the mix.

When Mike Oldfield recorded Tubular Bells in 1973 he had no idea his first album on Virgin Records would be chosen as the soundtrack to The Exorcist later that year. Neither did he know that recording with Virgin Records would have an unintended consequence of hiding a secret message which dates back to 1926, shortly after World War One.

more »

Leave a response »

Latest SSTV Images (auto updates!)

MadPsy : July 30, 2021 20:00 : Radio, Uncategorized

The Slow Scan TV images below will update every 30 seconds if I’m running the reciever for them. You never know what you might see so is kinda cool to see them appear in real time. I’m showing the last 20 images which have been decoded, usually from either 20m or 40m bands.

Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.

A literal term for SSTV is narrowband television. Analog broadcast television requires at least 6 MHz wide channels, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up to a maximum of 3 kHz of bandwidth. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame.

Since SSTV systems operate on voice frequencies, amateurs use it on shortwave (also known as HF by amateur radio operators), VHF and UHF radio.

more »

Leave a response »

Yaesu WiFi TX and Voltage Sensor for Home Assistant

MadPsy : May 14, 2021 17:52 : Electronics, Radio

A simple and quick project for detecting when a Yaesu transciever is transmitting and feed that status to Home Assistant to then perform actions. This can be used to, for example, automate killing the power if the radio gets stuck TX’ing when using automated digital modes software such as WSJT-X remotely. It can also measure the supply voltage, which is always useful information to know, especially when operating remotely.

more »

Leave a response »

FT8 DMC Awards

MadPsy : May 14, 2021 09:33 : Radio

All my FT8 Awards from

more »

Leave a response »

FT8: How to configure WSJT-X and useful tips

MadPsy : July 18, 2020 13:44 : Radio

At almost 1000 QSOs with FT8 using WSJT-X I thought I’d share a quick set up guide and some tips.

I won’t go into TX here, only RX for now.

more »

1 Comment »

Calculating performance of outdoor wireless network links

MadPsy : January 15, 2017 14:07 : Networking, Radio

This article contains information on how to calculate the operating margin of a wireless 802.11 network using a known distance between the two points.


I wrote this quite a while ago and although the throughput of wireless links has dramatically increased the basic theory still applies. Of course we now have 5GHz available, which is very useful for this application. You should be able to substitute ‘f’ for 5000MHz and the maths will still work.

You can now get a 150mbps PTP link over 15km using equipment that costs £160 for both ends – that’s the entire cost of the system (minus a couple of poles and brackets). Crazy value for money when you think about it. The Ubiquiti NSM5 NanoStation is one such example. The Ubiquiti product range is pretty impressive to say the least. The NSM5 seen below is the big brother of the LOCOM5, which at £125 can still do 10km at the same rate and are around half the size.



If you are considering an outdoor wireless link, give this article a read so you understand how high above objects you need to mount your shiny new kit!

more »

Leave a response »

FM Transmitter with Raspberry Pi

MadPsy : October 13, 2015 22:52 : Electronics, Radio, RaspberryPi

When I first read about this I thought it can’t be real but it is. The Raspberry Pi can be used as a stereo FM transmitter. It’s a pretty nifty discovery which uses a GPIO pin on the Pi to generate spread-spectrum clock signals and outputs FM Radio energy.

Radio Pi FM

There’s no point in me rewording what has already been written so here is the explanation from the guys who discovered it over at »

Leave a response »
« »