Shortwave Memories — World Radio-TV Handbook

by Karl D. Forth

Reading through the 1971 World Radio-TV Handbook only as a reference source was interesting, but as I started listening more I also realized I felt part of what was happening – I could hear many of the countries described, one way or another.

I’ve always liked directories. You can often learn more of what’s happening than you can in a textbook.

The 25th edition of the directory of international radio and television was published in 1971 in English in Hvidovre, Denmark, and printed in Great Britain.

Looking at the information, organized by continent and country, you discovered that most European countries had a domestic network of AM and FM stations, including some very high-powered AM stations, along with domestic shortwave services and a full complement of what were called foreign services, the international broadcasts.

In Africa, many listeners got their news from domestic shortwave broadcasters and some AM stations. In 1971, FM had not penetrated Africa except in a few places. Likewise, Asia had few FM broadcasters outside of Japan and a few other countries. All domestic broadcasts in Indonesia, for example, were on shortwave, there was no AM broadcasting at that time.

I counted almost 75 advertisers in the 1971 WRTH, including many shortwave stations and makers of professional recording and studio equipment.

Advertisers included Radio Moscow, Shure stereo cartridges, Voice of America, Radio RSA from South Africa, Radio Sweden, Continental Electronics, Hallicrafters, a Chicago area maker of shortwave radios, and Hammarlund Mfg. Co., a maker of top-line receivers.

WRTH also had the music signature and description of the interval signal for dozens of stations.

The United States listing in WRTH had only AM mediumwave stations with more than 10 kW, and no FM stations listed. Also included were Voice of America, and shortwave stations AFRTS, KGEI, WNYW, and WINB.

Central and South America still had a bounty of mediumwave and shortwave stations, including many smaller private stations

More than 23 countries were listed with DX programs. WRTH also listed time signal stations (almost every major country had one) and programs in Esperanto. TV had not achieved widespread coverage in many areas, although most countries had at least a few over-the-air channels.

I should mention two other publications from 1971, both well-written and informative. The first issue of Communications World in 1971, from Davis Publications, was written by Don Jensen and was a great introduction to the hobby. That same year, Communications Handbook, published by Popular Electronics, came out, with a mediumwave and shortwave DXing overview written by Richard Wood that also featured very good descriptive writing and information.

Karl D. Forth has been interested in radio and DXing for more than 50 years. This story was included in the book Radio Nights and Distant Signals.

Karl D. Forth has been interested in radio and DXing for more than 50 years. This story was included in the book Radio Nights and Distant Signals.

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24 Hours of Le Mans 2026 Special Event

Photo by lamnatheshark

Many thanks to SWLing Post contributor, Paul Jamet, who shares the following announcement:

24 Hours of Le Mans 2026

During the legendary 24 Hours of Le Mans Automobile race, the amateur radio operators of the Sarthe Radio Club F6KFI will be in the spotlight!

To celebrate the legendary 24 Hours of Le Mans, the amateur radio operators of the Sarthe Radio Club F6KFI will be in the spotlight!

From May 30th to June 14th, 2026, they will be activating the special callsign TM24H.

Operations will be available on numerous bands and modes:

    • SSB
    • CW
    • RTTY
    • PSK
    • FT8
    • VHF & QO-100

A great opportunity for all radio enthusiasts to connect with this special activation and celebrate one of the world’s greatest motorsport events together!

Tune in, stay tuned… and happy TM24H hunting!

Radioamateur #LeMans #24hDuMans #HamRadio #TM24H #F6KFI

Another URL: https://www.24h-lemans.com/en 

The MLite-880: A more thorough performance assessment

By 13dka

Following up on the article I recently wrote about the MLite-880, I still had a comparison with a reference radio on a proper antenna on my to-do list. I wasn’t in a hurry because I got pretty fascinated with exploring what I can get out of various magmounts on my car with this radio, which is quite a lot and it never gave me the feeling of missing out on something. I was also a bit hung up on the idea of comparing the MLite with the Belka because, you know, same price level and all, but that’s a bit iffy with my little passive splitter and 2 different input impedances.

Then a claim was made on the interwebz that the MLite-880 would be just a mediocre radio that would not stand scrutiny without its outstanding noise reduction, to summarize that in my own words. My experience is obviously very different and it made me curious how much truth could be in this claim. So I just took the ingenious Icom and the mediocre MLite to the dike to slip in a little shootout and then maybe give the loser a Viking funeral on a little raft I improvised out of flotsam and jetsam while making a lot of recordings to give my findings a whiff of evidence.

Both radios were connected to my lazy 10m/33′ monopole antenna via a Diamond SS-500 splitter and 15m double-shielded and common-mode choked coax. Both were recording to their own SD cards, but unfortunately, the recorded audio from the Icom does not represent the live audio off the radio on AM recordings because it records to an SD card with an 8 kHz sample rate, and that limits the audio bandwidth to at best 4 kHz.  The deciding thing to listen to in these recordings is the noise and sometimes the pure existence of a signal, though, and lower bandwidth is almost an advantage in this context.

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Sensitivity Test

Since the question is really the practical sensitivity and, therefore, how dependent this radio is on its noise reduction to get good results, I’ll start with the IBP beacons, which were recorded without NR, of course. To spot and quantify SNR/sensitivity differences you can use the four -10dB stepped (100W, 10W, 1W, 0.1W) dashes the IBP beacons transmit after their callsign.

The most grassrootsy first: OA4B in Peru (10,800km/6,700mi) on the 17m-band. MLite first, then the Icom. Both radios receive the second (10W) dash as faintly as the 100W dash, but with too little SNR left.

5Z4B beacon in Nairobi, Kenya (6,600km/4,100mi with a 3rd dash = 1W!) informing a silent 15m band about the opportunity around sunset. MLite starts again, then the Icom. The latter has the 3rd dash faintly but clearly and the former leaves some more ambiguity about that. Demonstrates again the minuscule difference.

5Z4B again, but on 20m with a 4th dash to count, whether or not the last one is really from 5Z4B or just interference doesn’t matter; what counts is that both radios heard it. The 1W dash was clearly received by both, starting with the MLite.

Here’s one where only the MLite heard an interference, and I’m not sure it imagined it (absolutely unavoidable pun) – VK6RBP in Australia for the 10,000 miles bragging rights.

I think the conclusion here is that we could probably agree on “same ballpark”, right?  I don’t know about you, but imagine my surprised Pikachu face!

The AF SNR difference, which is probably all that counts in sensitivity tests, is within 3dB between the two, not to be confused with RF power decibels (but reflected on the RF side in comparably small amounts). For the interested:I did take day/night variations of the noise floor above 10MHz into consideration, with a decreased noise level around midnight on 21MHz, the MLite still matches the Icom, which is all that counts in this comparison (not absolute measurements) context.

The magic button

Another claim was made about the noise reduction, that it would only work with signals of a certain strength. While it is technically correct that it needs a minimum SNR to improve upon, my experience is that it is effective with almost any remaining SNR, provided the signal is fed into the NR with sufficient levels, and it exceeds all my expectations at that. Here are a few recordings of CHU demonstrating both points:

CHU 14670 kHz in Ottawa (5,800km/3,600mi) in bad enough conditions. The same announcement from the IC-705, then the MLite with NR at ?  of its range. Note how difficult the French announcement at the end of the transmission is for both radios. I will miss that station. The noise, not so much.

This is just the announcement a minute earlier, when the signal dipped below the noise floor. Nothing gets really recovered, but nothing gets lost either, and what’s left stands out more:

However, if you only look at its inability to cheat physics, you could be missing the point of a good noise reduction in this particular “shortwave radio” context. Restoring fidelity, removing masking noises and generally increasing the SNR and thus ease of listening is having a massive impact on how at least I can enjoy programs or conversations and there’s more: After a few decades many of us (particularly 2-way) radioheads have gotten their auditory cortices hardwired to make a connection between noise and signal strength and then pushing this NR button might feel like witchcraft when it makes a bloke driving around on the other side of the globe sound like he’s just passing your local highway intersection.

In the following sound clips you will hear both radios taking turns in 5-second chunks as if I switch forth and back between them, in some of them I will play the same bit of transmission twice, first from the one, then the other radio so you can e.g. make out differences quite precisely. Continue reading

Tecsun PL-520: An Excellent Upgrade

by Dan Robinson

The Tecsun PL-520 has been out for some time now though units have been getting into the hands of more reviewers such as myself in recent weeks. There are a number of excellent overview videos available on YouTube, so my purpose here won’t be to dive into sensitivity level and similar comparisons with the PL-330, rather just to give prospective buyers my take on this radio.

First the headlines:  Tecsun certainly knows what its buying public is all about.  They have added some important features that really make the 520 an attractive option.  At the top of the list:  a kickstand where none existed before on the PL-330 makes it very easy to use the radio on a desk (though the kickstand does seem a bit vulnerable to breakage).  The cabinet of the 520 has been substantially improved — no more sharp corners seen on the PL-330.  There is now a USB-C port, another welcome change. 

Tuning and VOL knobs have been made slightly wider.  HOWEVER, they are still bothersome — trying to rapid tune across frequencies remains a challenge.  One suggestion:  Tecsun should add a TURBO mode, similar to what has now been done on the Malahiteam MLite-880 that could easly allow fast tuning across the ranges — this would obviously be more useful on shortwave than MW or FM.

 

Addition of a Favorites button, which forced LSB/USB to be combined into one key, is somewhat puzzling, but I suppose this has some appeal for some users.  ETM+ mode provides the ability to save stations based on time of day.  This is another appealing feature though I am not sure how many people will actually make regular use of it.

Back to the unified LSB/USB button — this means there is a slightly different approach to recalibration requiring a double press to be sure you know what sideband you are adjusting.  The PL-330 was quite easy, but in the 520 it’s a bit more involved.  I have found stability after recalibration to be very good, though my PL-330 was excellent in this regard.

Tecsun has provided additional filter choices on AM/LW/SW: 6 khz on SW and 5 khz on MW.  Not a critically important upgrade but certainly welcome.  There is also a ATS Scan/Stop Sensitivity adjustment.  As for synchronous (SAM), it works well on the 520 as it did on the 330.  It’s nice that Tecsun understands the need for selectable sideband in SAM — some people think it’s a useless feature but it avoids having to fine tune while in SAM.

I find that sensitivity to touch on the 520  (this is an important issue on portables with some people using additional lengths of wire to avoid drops in sensitivity when a radio is not being physically held) is not a big problem.  With the whip antenna fully extended any difference in level is not extreme — I am unaware of what changes may have been made in the physical structure of the cabinet vis a vis the 330, but I doubt there has been much change other than rounding the corners. 

In late afternoon here in Maryland I did brief test of the PL-330 and PL-520 at about the same location inside my home tuned to the strong signal from Spain on 15,500 khz.  I did another quick comparison of the PL-520 with an MLite-880:

https://youtube.com/shorts/tC3u633Xsws?feature=share

https://youtube.com/shorts/kt95hF3CPCU?feature=share

The comparison between the 520 and 330 shows in my view a bit better audio on the new receiver than on the 330. The comparison between the PL-520 and MLite-880 shows that the Tecsun is quite good at producing quality audio — but there’s a need to understand that the MLite-880 is really a different animal. The PL-520 produces some super audio with clarity; the MLite-880 is not inferior by any means but has a different kind of sound (not to mention extensive tools beyond the 520’s capabilities).

My concluding views on the PL-520 (and thanks to Anon-co for providing the test unit): for someone who wants the smallest possible receiver but one that really hits balls out of the park in performance, I have no hesitation recommending this radio.

The key improvements over the PL-330 make it even more attractive, especially the backstand, sleeker cabinet, and additional bandwidths. At the low price the 520 is sold at, this is pretty much a no-brainer and in today’s — shall we say — diminished world of international broadcasting, if you’re going on a trip the PL-520 is all you really need, unless you already have a PL-990 or H-501 and insist on having those with you for better sound. The one thing one needs to be aware of is the need to carry extra BL?5C 3.7?V batteries and perhaps a charger that handles them, though charging can be done internally with USB-C.

Tecsun has stuck to the pattern of using what I’ll call old-style displays and making incremental improvements in known best sellers, such as the PL-330, and now with the PL-520. One wishes that Tecsun would make the leap that we have seen from Malahiteam in Russia to perhaps provide a spectrum display.

Perhaps in a future PL-1000 or H-600 we will see that happen, but for now we have extremely reliable performers in the Tecsun line that provide such features as recalibration along with multiple bandwidths and SYNC (though that feature remains a bit hobbled due to chip limitations).

Radio Bulgaria: QSL Card Features Radio Sofia’s 1939 Broadcast Van

Photo Source: Radio Bulgaria

Many thanks to SWLing Post contributor, David Iurescia, who shares the following news: 

In 2026, Radio Bulgaria is issuing a new series of 12 QSL cards to confirm listeners’ reception reports. Each card highlights a key historical moment from the history of Bulgarian National Radio (BNR) and the Radio Bulgaria programme. At the beginning of each month, a special publication shares interesting facts related to the images featured on the cards.

The sixth QSL card for 2026 is dedicated to Radio Sofia’s outside broadcast van.

Click here to view more images and read the article at BNR.

More 250 year celebrations and WHFM

Hi to all SWLing Post community. Here’s news of what Imaginary Stations will be bringing to the ionosphere this week.

We have the second episode of Radio 250 via Shortwave Gold, which is full with all sorts of genres of music celebrating and bringing you more of a musical history lesson over the shortwaves. The schedule for the show is on Saturday 6th June at 1100 hrs UTC on 6160 kHz and then again on Sunday 7th June at 1300 UTC on 6160 kHz and 2000 hrs on 3975 kHz/6160 kHz. Tune in for another salute to the United States of America!

Also on Wednesday June 10th at 2000 UTC on 3975 kHz/6160 kHz we bring you Skybird Folk & Country Radio (repeated on June 17th). If you’re into both those genres you are going to love this show! There’s a large saddlebag’s worth of electric and acoustic tunes for your listening delight. We welcome listeners to wear cowboy boots and denim for this special transmission

Also on Wednesday 10th June 2026, at 0200 UTC on 9395 kHz on WRMI we have WHFM – Herman’s Radio and Record Room. This is the second in a series of programmes recorded by DJ Frederick Moe in memory of his father Herman (1919-2001) and feature mid-century sounds including country, jazz, folk and easy listening.

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.

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