AmateurRadio.com

The other day I was pottering around Facebook and stumbled across an amusing story via BBC News I think about a young couple who had decided to set themselves the challenge of visiting every one of the over 2,500 railway stations across Britain. I later discovered it’s connected to a Kickstarter project and has a website http://allthestations.co.uk. Reading some of the comments to the video – always a risky activity – I discovered a reference to the videos made by Geoff Marshall (of the same couple) exploring the secrets of the London underground and another youtube video – via https://www.youtube.com/user/geofftech2 – where he talks about cassette tapes. He also has a website at http://geofftech.co.uk.

In the comments to this clip there were a number of pointers to another youtuber who focuses on old analogue technology called ‘Techmoan’ – https://www.youtube.com/user/Techmoan. One of the first videos of his I watched featured what Techmoan described as his holy grail of 1970s consumer electronics – something that featured both Nixie tubes and an oscilloscope to visualise the music – a bizarre old silver SAE hi fi amplifier you can see on https://www.youtube.com/watch?v=ZkCIdufSGS8.

About half way through the video he demonstrated the way the small oscilloscope worked. Normal music resulted in an animated but pretty fuzzy trace jumping about the screen. Then he put some different audio into the amp and the oscilloscope which resulted in regular geometric images appearing on the small screen. Quite amazing! I was aware of the neat regular waveforms that can be created with different frequency ratios on the X and Y plates. The Australian ABC’s logo was created by using a 3 to 1 ratio many years ago. But what I was seeing on the screen was lightyears beyond that.

He got a lot of comments pointing him to resources on oscilloscope music and a follow-up youtube video had pointers to a number of clips and sites, most notably Jerobeam Fenderson’s site at http://oscilloscopemusic.com.

You can view a number of his pieces on his Youtube channel – https://www.youtube.com/user/jerobeamfenderson1.

Techmoan also provided links to an Oscilloscope Emulator for Windows, Mac & Linux https://asdfg.me/osci/ which works on my Mac and a Reddit Oscilloscope Music Page https://www.reddit.com/r/oscilloscopemusic/ with further links and info about this bizarre art form.

Jerobeam Fenderson also offers a program to create oscilloscope music called OsciStudio via his website.

Steve G1KQH has tracked down yet another bargain. I think my SMA assembly skills are probably still not up to the task, but you can hardly go wrong at the price which includes free air-mail shipping. Another absolute bargain. I think Steve must have shares in Bangood!!  If not, they ought to make him their UK agent, HI.

Here’s another one (kit), we could get our teeth into:

http://www.banggood.com/DIY-Digital-Oscilloscope-Kit-Electronic-Learning-Kit-p-969762.html

I have that many kits at the moment, I don’t know where to start next? If I come back in another life can we have a 48hour clock pse!

73 Steve
http://www.g1kqh.talktalk.net/

Introduction:

• Russ flies solo on LHS! Well, almost. Harrison, VE2HKW, fills in as co-host.

Topics:

• What’s in a name? Russ talks about the philosophical ramifications of the phrase “Linux distribution”, and referring to Linux vs. GNU/Linux. Richard Stallman prefers using GNU/Linux to refer to the operating system, and Russ seems to agree, but feels it doesn’t go far enough. Share your thoughts via the usual communication channels.
• hamqth.com is an alternative to QRZ.com for callsign lookups, and has an application program interface (API). Russ has programmed the gnorman bot in the LHS IRC channel to access hamqth.com. While in the chat, enter “.qrz some_callsign”, and gnorman will return the info.
• Another application that uses the hamqth.com API is QtLog. It’s mostly in German, but there’s enough English to allow you to use the program. It seems to require that you have a MySQL server running on the same computer. It also supports HamLib for rig control. You can use Google Translate to translate the website.
• Harrison offers an overview of oscilloscopes, including what they are, the controls, and how you might use one in your ham shack. There are several instructional videos available on W2AEW’s YouTube channel. (You can learn more about Alan, W2AEW, on his QSL.net page. There are also software-based oscilloscopes, like xoscope. Of course, you’ll need a hardware interface to the computer’s sound card.

Feedback:

• Please make a donation to our Dayton Hamvention fund, like these fine people: Paul G. (annual membership and 2 donations), Ron E. (yearly membership), Jeremy H. (monthly membership), Scott P. (monthly membership), Bill A. (monthly membership), Bill H. (monthly membership and donation), Gary U. (monthly membership), John K. (yearly membership), and Jerome S. (donation). Thank you, all!
• Gary (KE2YK) expresses his appreciation for Richard’s screencast Introduction to JT-65.
• Brian (WB4ES) sends his best wishes to Richard.
• 100th episode audio feedback from Claudio of the Linux Basement podcast.

Contact Info:

• Contact Harrison at [email protected].
• Contact Russ at [email protected] or [email protected].
• Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
• Leave us a voice mail at 1-909-LHS-SHOW (1-909-547-7469), or record an introduction to the podcast.
• Sign up for the LHS mailing list.
• Sign up for the MAGNetcon mailing list.
• LHS merchandise is available at the Merch link on Web site. Check out the Badgerwear or buy one of the other LHS-branded items at PrintFection.com/lhs or Cafe Press. Thanks!
• Thanks to Dave from Gamma Leonis for the theme music.

Music:

• “Fraud” by Jonathan Coulton from the album Artificial Heart.
• “Down Today” by Jonathan Coulton from the album Artificial Heart.

Welcome to the first episode of Linux in the Ham Shack that doesn’t have Richard it in, on purpose. I can personally say that I feel his absence rather heavily in this program, but overall I think the show went rather well. Harrison, VE2HKW, was kind enough to be a guest host to help me out. Episode #102 will also have a couple of guest hosts, rather likeable ones at that, and so it will go until a permanent(?) replacement is found for Richard. We can only hope he comes back one day to grace us with tales of strippers on scooters and discharging firearms indoors. Until then, I soldier on. Thanks for listening and remember, you can send feedback to [email protected], or by voice mail at 1-909-LHS-SHOW (547-7469).

73 de Russ, K5TUX

I visited Riga, Latvia with a youth group which we as a family were involved with in 1992, and there I stumbled upon a Soviet oscilloscope in a department store. It was from the neighboring country, Lithuania, and was manufactured in Vilnius, the capital. The markings say what I guess means “Made in the Soviet Union”. At least it says CCCP in the upper right-hand corner. I remember these letters very well as all Soviet athletes used to have them on their backs.

The oscilloscope came with full documentation, even with a bilingual manual. I had grown fond of this oscilloscope as it was lightweight and simple to use once I had learned what the Russian markings meant. It is a typical instrument for TV-repair with a 7 MHz bandwidth.

Now after 20 years, I was therefore very sad when it malfunctioned. This was the time to test if the manual was helpful or not. The symptom was that the beam no longer could span the whole screen in the X-direction. Even with the Horizontal positioning all the way to the left one could barely see the beam.

I opened the bilingual manual only to discover that the two languages were Russian and Lithuanian!

But lucky for me, the schematic was similar to what I am used to and quite readable. It even contained PCB-layouts.

It showed two high-voltage transistors, KT940A, in the last stage of the horizontal amplifier. One of them turned out to have an open emitter-base junction. Specs that I could decipher from Russian data sheets on the web showed that KT940A is NPN, 300 V, 90 MHz. I found that I had a 2SC2611 lying around with similar specs. It even fitted the same footprint.  So now the oscilloscope is back in business again.

The oscilloscope is called Saga – осциллоскоп “Сага” – osciloskopas “Saga”. It would be interesting to learn if this factory is still in business. Were they able to diversify into other areas in these very interesting last 20 years of independence for Lithuania, and indeed all three Baltic states, or have they vanished?

Every now and then I come across great books or videos that explain a concept in such a way that it becomes immediately obvious what is going on. I’m a great believer in learning by demonstration or even better, learning by doing.
I came across another explanatory video recently that I thought was too good to keep to myself. It covers a topic that was a complete mystery to me: Phase Locked Loops. We utilize them in almost every modern transmitter and receiver yet most people I have talked to view them as a black box that, fortunately, does its job well and usually without interruption.
The video below does a good job on opening the black box and showing just what makes phase locked loops … well, lock.