Monthly Archives: August 2025

Giuseppe’s Ingenious Recycled Antenna Board for SW & MW Listening

Screenshot

Many thanks to SWLing Post contributor Giuseppe Morlè, who writes:

Dear Thomas,

I’m Giuseppe Morlè, IZ0GZW, from Formia, in central Italy on the Tyrrhenian Sea.

I’d like to show you my antenna board for shortwave and mediumwave listening with portable receivers like the Tecsun PL-660.

The board has two distinct circuits:

      • A small-diameter loop with two turns for shortwave reception (3.5–18 MHz).
      • Three ferrite rods with 30 turns each, plus a four-turn link coil that carries the signal to the receiver for mediumwave reception.

In the video, you’ll see how the board works on its own, and then how performance improves when I connect a 15-meter wire and throw it over the balcony of my house. In that case, the signal becomes much stronger.

Tuning is done with a 900 pF variable capacitor. To listen to mediumwave, I simply disconnect one side of the shortwave loop. With just that single variable capacitor, I can tune all of the bands.

It’s a surprisingly effective antenna for small portable receivers, and it’s built entirely from recycled materials—at no cost.

I hope you enjoy it. Greetings to all the friends of the SWLing Post.

73, Giuseppe Morlè, IZ0GZW

Click here to view on YouTube.

Many thanks, Giuseppe, for once again sharing your creativity with us. I’m always impressed by the antennas you design and by the performance you achieve—especially considering they’re largely homebrewed from recycled parts. That’s radio at its very best!

[Note that his video is in Italian, but you can turn on subtitles for your preferred language.]

Raddy RF750Plus: A Miniature Wonder!

 

Robert K4PKM

Raddy has come out with what I call a miniature wonder – a feature-rich radio that really does fit in the palm of your hand!

The Raddy RF750Plus is a very small radio. It measures roughly 2”x3”x1-1/2” without either antenna extended/attached. In fact, one of the reasons I agreed to review yet another shortwave radio from Raddy was because this was so small. Frankly, I was curious whether this radio would have real usability, or would it just be a cute little “toy” radio. Well, it definitely falls into the “real usability” category for those who want to take a small radio along with them wherever they go, even in their shirt pocket!

Truly hand-held!

This is truly a hand-holdable radio!

Quite the size difference!

Quite the size difference!

Okay, enough about the size, for now. This radio has most of the typical features we have come to expect from small portable radios these days. Rather than repeat what features it has myself, here is the main information from Raddy’s website:

RF750 PLUS Brings You:

Multi-band and 3-in-1 Receiver: BT speaker, SD card music player.

APP Control.

Enhanced AM Reception with an extra T-type antenna.

User-friendly features like USB-C charging & headset port, a replaceable lithium battery, and SOS alarm

Specifications
Reception Range:
FM: 64.0-108MHz
AM: 520-1710KHz
SW: 4.75-21.85MHz
WB: 162.40-162.55MHz(Only US)
Receiving sensitivity: FM/WB: ?18dB / AM: ?86dB / SW: ?30dB
Preset Stations: Total 297
Quiescent current: ?50uA
Max current: ?800mA
Speaker: 4? 3W
Bluetooth version: Ver 5.2
Min working voltage: 3.4V
External input voltage: DC5V
Lithium battery: 3.7V
TF card playback Format: MP3/WMA/WAV /APE/FLAC
TF card capacity: ?256GB
Battery: BL5C 3.7V 1000mAh
Earphone output: Type-C
Dimension: 2.2×3.0x1.7 inches / 75x56x44 mm
Weight: 7.9oz / 226g

What’s in the box?
1 x RF750 PLUS Shortwave Radio
1 x T-Type Antenna
1 x Type-C Charging Cable
1 x Type-C to 3.5mm Adapter
1 x Strap
1 x Carabiner
1 x User Manual

I have tested the app on an iPhone and it worked right out of the box, using the same app as other Raddy radios, and I have to admit, it’s the way to go if the radio is stationary. It is easy to tune through the app keyboard, as well as change various settings.

Several nice features deserve special mention with the radio. One is its heft. This is not a lightweight radio compared to its size. It will easily stand on its own without blowing over in reasonable conditions. As one might expect, the weakest point is the antenna – one must be aware of its limitations. It is telescopic, but not rotatable. In reaching for the radio, it stands quite a bit taller than the radio itself, so you should be careful to look at what you are grabbing!

A second nice feature is the included external AM antenna which does rotate, and which does a nice job of pulling in signals. You may already have similar, larger external antennas which will also work with the radio, but the one included performs well.

A third feature I find well-thought out are the covers for the various jacks, such as the external antenna cover, the USB-C cover, and the TF card cover. These open easily, but also snap into place to provide a good level of dust and moisture control.

Finally, the included cables for charging and for adapting a set of earphones/headphones are a welcome touch at this price point.

You will definitely want to read the manual to operate this radio!

Performance

Audio quality is good, with full sound despite the speaker being housed in a small unit. FM sounds excellent (though not in stereo through the earphone jack/adapter, but does come out of both sides), as does AM with strong signals. Naturally weaker AM signals are typical of any radio, but there is some adjustment possible with the equalizer settings available should you want to experiment.

Shortwave reception is adequate given the length of the antenna, but not a powerhouse, which is to be expected for a radio in this class. Stronger stations come in fine with good audio, but this is not a radio with which you will go DX hunting on the SW bands. Like many small portable radios, this is primarily an AM/FM/Weather radio, with shortwave thrown in as a bonus.

As for the NOAA weather stations, I receive only one of the stations at my home, while other portables may receive up to three. Of course, location is the primary factor here, so your mileage may vary. The one it receives is very strong, and a second station is very faint – but that might also be due to being inside when testing.

Pros and Cons

Pros

  • Small size (see also Cons)
  • Solid case with good weight
  • Good sound
  • 2-speed scanning – hold the joystick to start tuning and then release, or hold it a bit longer and get much faster tuning, great for shortwave bands
  • Excellent app for iPhone (and likely excellent for Android)
  • Dust/Moisture covers
  • Lots of lights 🙂
  • Included cables and replaceable battery
  • External antenna included
  • Includes a bubble level – who knows when that might come in handy?!
  • SOS feature
  • Price (currently $34.99 on Raddy site during anniversary sale)

Cons

  • Small size (see also Pros) – large hands may have difficulty switching modes with the power button
  • Power button requires quick double press to change modes – at first I thought it was not working until I moved more quickly.
  • Multi-function joystick has a lot of tasks depending on mode – being small might make this more difficult to operate or achieve desired action. I did adjust pretty quickly to this.
  • Antenna is flimsy, but if handled properly still should last without issue.

Conclusions

This is a nice little radio which takes up very little space, can be carried in a shirt pocket, and has a lot of features packed inside its solid frame. The price is very reasonable for what it offers, and the ability to use an app to control it is a great feature given its small footprint. Frankly, I cannot see how one could make a smaller radio with all this functionality, except perhaps in a James Bond movie! We do live in rather amazing times! Cheers!

Available at Raddy ($34.99 USD at time of writing; $41.99 regularly)

Available at Amazon

 

Hammond Museum of Radio Welcomes Visitors Again

Many thanks to SWLing Post contributor Markku Koskinen, who shares the following tip from Guelph Today:

Hammond Museum of Radio reopens after two years

After a two-year-long closure the Hammond Museum of Radio has reopened.

The museum at 595 Southgate Dr. attached to Hammond Power Solutions was closed because of a major renovation to the building which included an addition. In order to protect more than a thousand artifacts from construction, dirt, dust and vibrations the museum closed. Everything was covered with tarps and cloth.

Some of the more valuable radios were relocated to storage. Employees would regularly check there were no leaks coming from the ceiling and no cracks in the walls. The museum reopened last month by appointment only. [Continue reading…]

Hurricane Erin from NOAA radiofax via USCG Honolulu

Many thanks to SWLing Post contributor Carlos Latuff, who shares the following radiofax images and notes:

Hurricane Erin, featured on NOAA’s 24/48 tropical surface forecast, received a radiofax last night in Porto Alegre, Brazil, from the USCG radio station in Honolulu, Hawaii (16135 kHz USB).

Curiously, the signal from the USCG radio station in Honolulu reached Porto Alegre MUCH better than the signal from the USCG radio station in Boston. Honolulu is approximately 12,744 km away from Porto Alegre, while Boston is 8,307 km.

Carlos’ Illustrated Radio Listening Report and Recording of Voice of Turkey (August 18, 2025)

Many thanks to SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares the following illustrated radio listening report of a recent Voice of Turkey broadcast.


Carlos notes:

Pakistan flood death toll exceeds 300, Voice of Turkey, 9870 kHz

Click here to view on YouTube.

More supermarket surfing!

Greetings to all SWLing Post community, Imaginary Stations have a couple of shows coming your way this week via those shortwaves.

There’s even more about the art of surfing with SURF 6 on Saturday 23rd August 2025 at 1100 hrs UTC on 6160 kHz and then again on Sunday 24th August 2025 at 0900/1300 hrs UTC on 6160 kHz and at 2000 UTC on 3975 kHz and 6160 kHz (via the services of Shortwave Gold). Get back on that board and enjoy more surf related classics!

We’ve got the back-to-school edition of KMRT on Wednesday 27th August 2025 at 0200 hrs UTC via WRMI. Expect some blue light and centre aisle 45 specials. So tune in and grab yourself a great “once in a lifetime bargain” thanks to the fruits of the ionosphere before the schools go back in session.

Here’s more on SURF:

For more information on all our shows, please write to us at [email protected] and check out our old shows at our Mixcloud page here.

FastRadioBurst 23

KPH Crypto Transmission on August 30, 2025 at 20:00 UTC

Many thanks to SWLing Post contributor Paul Jamet, who notes that the Maritime Radio Historical Society is hosting another Crypto Transmission from KPH on Saturday, August 30, 2025 at 20:00 UTC.

Click here for full details about the event and how you can participate on the Maritime Radio Historical Society website.