Author Archives: Robert Gulley

MULTIPSK Update

Patrick Lindecker, author of MULTIPSK, has announced an update to the software with the addition of DMR decoding (not to be confused with DRM, the subject of several recent posts – alphabet soup!!).

Here is a portion of the announcement:

New release of MULTIPSK (4.42)

The new release of MultiPSK (4.42) is on my Web site (http://f6cte.free.fr/index_anglais.htm).
The mirror site is Earl’s, N8KBR: https://www.paazig.net/f6cte/MULTIPSK_setup.exe

The main improvement of MULTIPSK 4.42 is the following:
Ham DMR decoding (but not the voice)

“DMR” is the acronym for “Digital Mobile Radio”. The basic specifications of this mode are public (ETSI TS 102 361-1 to 3 for the “Tier II” protocol used by Hams), but any supplier can add supplementary functions. It is used in VHF and in UHF, mainly for voice communication but also for data communication. It is a mode for professionals but also used by amateurs (according to a precise organization). For Hams, it is spread in a world net by using, among other means, repeaters and Internet.

The amateur DMR communications are the sole object of the Multipsk decoding (professional communications are decoded but ignored). The DMR is considered as a “professional” mode by Multipsk (but the Ham decoding is not limited in time).

It is here only considered the data communication which summarizes to identifiers (callsigns+first names) and possible text messages (with some rare positions).

Example:

F9XYZ Michel (2088006 – France), via TG 20800 (YSF France) – Slot 1

F0ZZZ Yves (2083004 – France), via TG 20800 (YSF France) – Slot 1

Note: the voice communication decoding is excluded because it needs an AMBE+2 Codec (under a proprietary licence).

For Hams and SWL, the DMR signal can be received:

· either from the discriminator output of a classical VHF/UHF FM receiver via a direct connection to the PC sound card. However, the receiver must have a large reception bandwidth due to the high modulation speed,

· or with a SdR receiver (FunCube Dongle, RTL SDR,…) and directly demodulated by Multipsk. It is the simplest solution.

Here is the WEB address where you can know where all DMR repeaters are located, with their frequencies, for each country: https://www.repeaterbook.com/repeaters/niche/index.php?mode=DMR

This mode is in freeware, so without time limitation.

MULTIPSK comes in two versions – a freeware version and a one-time paid version. It’s the same download, but buying a serial number unlocks many additional features. Note however, the DMR function is part of the free program.

While there have been many additional updates to the software from the time I wrote a review of the program, if interested you can access my review (published in The Spectrum Monitor) here:

MULTIPSK Review

Cheers! Robert K4PKM

Robert Gulley, K4PKM (formerly AK3Q), is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love

CQ Serenade – Very Cool!

This link was forwarded to our Amateur Radio Club by a member (who is quite proficient in Morse code, unlike me!) and I just had to share it with Thomas and the SWLing gang!

https://www.on6zq.be/w/index.php/Audio/CqSerenadeFr

There is both a French version and an English version of the song, so enjoy them both!

Robert Gulley, K4PKM (formerly AK3Q), is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love

Electricity Battle Movie Finally Coming to Cinemas in 2019

Nikola Tesla and Thomas Edison

The movie, The Current War, is a film based on true life events of the feud between Thomas Edison and Nikola Tesla. This film is about the race between them to power New York, and ultimately the world, with electricity.

From The Vintage News

“The film, which is a dramatization of real-life events, will follow the tumultuous journey of Thomas Edison, played by Benedict Cumberbatch, as he attempts to use his DC technology to introduce light to Manhattan,” said Variety. “However, his initial efforts are obstructed when businessman George Westinghouse (Michael Shannon)  and his partner Nikola Tesla (Nicholas Hoult) rival the inventor with Tesla’s own AC electrical current.”

(read the full article here: Edison Tesla Film )

I suspect the film will be quite interesting, and likely entertaining for those of us interested in both history and radio. One of the actors is a favorite of mine from one of the recent British adaptations of Sherlock Holmes stories, Benedict Cumberbatch.

Cheers! Robert

Robert Gulley, K4PKM (formerly AK3Q), is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love

There Are Storms A’Comin’!

Something new (to me) caught my eye this morning and brought an exclamation to my lips: the three-day geomagnetic forecast for today shows Purple!! This indicates some serious geomagnetic activity! Red is not uncommon, but Purple really got my attention!

The disturbance is due to an active sunspot area 31 times the size of earth! There are 3-4 CMEs (Coronal Mass Ejections) headed our way, arriving in the next day or two, which will likely make SWLing a bit difficult, if not causing at least momentary blackouts in some places.

On the upside, for those amateur radio folks who like working Auroral Skip, conditions are likely to be quite interesting in the VHF and above ranges.

SolarHam.net and SpaceweatherLive.com are both excellent sites to study solar activity, so give them a visit! 73, Robert K4PKM

Robert Gulley, K4PKM (formerly AK3Q), is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love

What is the Radio Hobby? One Perspective

The Geloso G.215-AN

I have recently been re-exploring the hobby of photography, which is a lateral move from studying astronomy (my main interest being astrophotography). At one time in my life I was a semi-professional photographer, having studied photojournalism in college and dabbling in nature and street photography (as it is now named). And no, I was never a paparazzo!

Following a link from an article on today’s SWLing Blog I landed on an Italian radio/audio company’s archive, the company being Geloso.  The above image is an audio amplifier and it caused me to think about radios (and related equipment) in much the same way I have been currently thinking about photography. Allow me to explain.

I spent about a decade in photography back in the days of film, black and white and color. (This was back in the days when the earth was cooling and dinosaurs roamed the earth!) Film cameras are to modern-day DSLRs much like IBM PCs are to modern day Intel Pentium i7 computers — that is to say, technology has really changed! Seeing what modern cameras can do within the camera is rather astounding, and certainly far beyond what we could even dream of in the 70s. The same is true in radios, of course, with radios from the 40s and 50s in comparison to today’s rigs.

And yet, just like film cameras of old being used today producing incredible photographs, radios from the past can still produce incredible sound if maintained well and their operation understood. And yes, I am getting to my main point, but in an intentionally somewhat circuitous route!

As I have been learning about these modern cameras and watching copious videos on YouTube, I have heard a recurring theme come up. Back in my early days I, like many folks today, always believed the next lens or camera would take me over the top and allow me to produce incredible shots. Oh, I might not have stated it that way, but it certainly was present in recesses of my brain. Now mind you, I was producing good photographs, but I was always looking for those shots worthy of a portfolio, and thereby sometimes missing out on great shots right in front of me.

Having just recently  purchased a DSLR camera kit with two lenses, before I had even taken a handful of shots with it, I was starting to think, “What will I need to add to this setup to make it really good? Oops, old habits die hard! Today’s cameras (and optics) from the top 4 or 5 DSLR makers are all head-and-shoulders above what we had access to when I was in photography years ago. There is no reason to look for the absolute best optics unless you have literally thousands of dollars to spend for what are at best, modest improvements under specific shooting conditions. The talent is not in the camera or the lens, but rather in the person behind the camera.

The same holds true for radios today, whether receivers or transmitters. Sure, you can spend thousands of dollars on the top of the line receivers or transceivers, and under certain circumstances, such a purchase may be the right thing. But for most of us, which radio you use does not matter nearly so much as the skill of the operator using the radio. Both the camera and the radio are tools, nothing more. A skillful radio operator can pull signals out of the mud or work stations at the farthest reaches of the globe with a 1940s radio that has gorgeous audio with little to no filtering, or they can use a modern DSP-equipped, roofing filter-loaded rig to hear stations so close together a cat’s whisker could fit between them on the frequency dial. In both cases, it is the radio operator who makes the difference by understanding their rig and knowing how to get the best from it.

Now if you are the type of radio hobbyist who really enjoys playing with the newest radio to hit the market and can afford it, wonderful! You help the rest of us have options when we do decide it is time for a new rig. But if you are the type person who believes you can’t really enjoy radio without having that “other” radio with the slightly better specs derived from precise laboratory conditions with nothing to interfere with signal reception, you may just be missing out on what you have right in front of you.

Believe me, I am not one to judge because people in glass houses should not throw stones! I have simply been surprised at myself as these old instincts have arisen in me, when I thought I had put to rest such things! In the radio world I have resisted the siren call of enticing marketing for the latest whiz-bang radios, at least in these more recent years (!) and now must use that same resistance in my photography. In radio I have learned to get the best out of my gear, and the results are very satisfying. Here’s to hoping I can do the same behind the camera!

Robert Gulley, AK3Q, is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love

Sangean HDR-18 HD Radio/FM-Stereo/AM Wooden Cabinet Table Top Radio

For those who might be interested, Amazon currently has this radio discounted more than I have seen previously. Current price is $137.75 – as always, this may be a limited time or limited amount of radios available at this price. Here is the link:

Sangean HDR-18

Robert Gulley, AK3Q, is the author of this post and a regular contributor to the SWLing Post. Robert also blogs at All Things Radio.

Spread the radio love

Raspberry Pi Vintage Radio

This project was a winner in the Maker Share Mission May contest. While not strictly shortwave, of course, many of SWLing Blog readers enjoy, as I do, all things radio, and especially creative and new expressions of radio. Here is a brief excerpt from the MakerShare posting:

Vintage radios are fascinating. At one point the radio was the main method for mass communication of news and entertainment and was manufactured in a variety of styles to be prominently displayed in a home. Unfortunately, many vintage radios that have been physically preserved no longer function and it is impractical for them to be repaired. Described is the design and implementation of the Raspberry Pi Radio (RPiRadio), a device that bypasses the analog electronics of a vintage radio and digitally recreates the behavior of a vintage radio that is able to be tuned to vintage radio programming.

The whole posting may be found here, with extensive details on the building of the radio and how it was programmed for sound replicating the vintage radio era.

While I love tinkering with old radios and trying to bring them back to life, some radios are just beyond reasonable repair. This can bring old radios back to life in a way which seeks to honor their past – a very cool idea indeed!

Robert Gulley, AK3Q, is the author of this post and a regular contributor to the SWLing Post.       Robert also blogs at All Things Radio.

Spread the radio love