Tag Archives: Guest Posts

Bob Reviews the Model L87 Digital Voice Recorder

Many thanks to SWLing Post contributor, Bob Colegrove, who shares the following guest post:


The Model L87 Voice Recorder

Reviewed by Bob Colegrove

L87 Voice Recorder (Source:  Amazon)

Introduction

Whenever I read a radio product review, the author invariably says whether the device has a line-out port.  This seems to say a lot about the importance attached to this feature by a great number of our fellow radio enthusiasts.  Besides audio recording, the port can be used for computer processing of facsimile and teletype signals.  For basic recording, it seems to boil down to three purposes:

  • to provide a permanent archive of some things we have heard,
  • to replay portions of a weak signal to determine its identity, or
  • to share our catches with fellow enthusiasts.

There was a time before cassettes (BC) when I used a mini reel-to-reel tape deck to record radio broadcasts.  This was not much bigger than a cigar box.  It used 3-inch magnetic tape reels.  There was no capstan.  The take-up and supply reels rotated at constant speeds to provide tape motion for recording and rewinding.  Thus, the tape would gradually accelerate past the heads as the diameter of the take-up reel increased.  Consequently, a recorded tape did not travel at a constant speed and could only be played on the original recorder.  I never used it much, and when it stopped working, I never bothered to replace it.

This winter I seem to be focused once again on medium wave DXing, and I began to think a recorder would be useful to help identify stations.  I couldn’t get much of a consensus as to what recorders other hobbyists were using, so I went on the Internet to explore the market.  Long story short, I wound up with an unbranded voice recorder.  Neither the hardware nor the manual gives much of a clue as to who made it.  The state of today’s small electronics market is replete with anonymous items.  Anyway, the price was reasonable, and I have it.

There are probably a dozen or more equally capable recorders currently available, including those from Sony.  So, this is not a model versus model comparison, but rather an enumeration of salient features of the Model L87 Voice Recorder and a conclusion as to its usefulness as an accessory for radio listening.

My recorder is marketed by Amazon [affiliate link] under the brand name of “G” (http://gtoptc.com/).  It has 8 GB of system storage and 64 GB on a removable SD (TF) card.  If you Google “L87 Voice Recorder” you will see that Amazon, Walmart, and eBay sell, what are by all appearances, identical recorders with greater or lesser system memory and different size SD cards.  Some include an external microphone.

Description

To say the voice recording industry has come a long way since my reel-to-reel experience is an understatement.  Digital media, miniaturization, and functionality pretty much sum up the improvements.

This device is billed as a voice recorder.  It is intended to be used in dictation or brought into a classroom, conference, or other meeting to gather an audible transcription of the proceedings.  Attaching it to the line-out jack of a radio is not an application that is listed in the promotional literature.  So, in selecting a device a radio enthusiast must be assured that line-in capability is available.

Also, there is a matter of compatibility.  The L87 voice recorder works very well with the Eton Elite Executive, Tecsun PL-880, Sony ICF-SW7600GR and Grundig Satellit 800.  The recorder was tested on a Sony ICF-2010 and did not work.  Apparently, the 2010s were designed to operate with older recorders having high-impedance microphone inputs.

Specifics

  • Memory – built-in system 8 GB, plus an included 64-GB SD (TF) card, 72 GB total.  This we are told will produce 3,343 hours of recording at 32 kbps.
  • Battery – 500 mAh rechargeable lithium ion, having up to 13 hours continuous recording at 512 kbps, and 24 hours of playback with earphones.
  • File formats – Recording:  WAV or MP3; or it can act as a player for any uploaded MP3, WAV, FLAC, APE, OGG, or WMA file.
  • Recording bit rates – for WAV:  512, 768, 1024, or 1536 kbps; for MP3:  32, 64, 128, or 192 kbps.
  • Gain settings – seven.
  • Voice activation – auto recording begins once the sound reaches a settable decibel level and stops when there is no sound.  Probably of minimal use for the radio monitoring purpose.
  • File management – files are named with a time stamp (year, month, day, hour, seconds).
  • Optional password protection.
  • A-B repeat function – a portion of recording can be blocked for repetition.  The A and B start-stop points do not alter the file and disappear when the file is closed.
  • Physical – dimensions:  4.13 inches long × 1.06 inches wide, × 0.39 inch thick; weight:  2.8 ounces.
  • Numerous other recording settings, including those for noise reduction.
  • First available – April 26, 2022.
  • Website – https://gtoptc.com/.

Experience

Being quite small, ergonomics is a consideration, and may take some practice.  As I am right-handed, I unexpectedly realized that I grabbed this little device in my left hand, like a cell phone.  That leaves my right hand free to press buttons, but I also tend to operate the controls with my left hand.  Like many small travel radios, many buttons are dual purpose, and one must get used to short presses, long presses, and correct button sequences.

As an example of complexity, a change in volume requires a quick press of the VOL button, then repeated presses of the up/down buttons to arrive at the desired level.  Fast forward and rewind are somewhat problematic.  A short press of either button will quit the file you are listening to and queue up the preceding or next file, while a long press will incrementally rewind or fast forward the file you are listening to.

As it is marketed, this is a “voice recorder.”  It provides a line-in capability, but you will have to supply your own stereo patch cord.  Once programmed to line-in, you will not have to reset it when making follow-on recordings.  Although it comes with an internal speaker, you can also swap out the patch cord with earphones for playback without changing any settings.  Just to try it out, I used the built-in microphones to record a radio at normal volume.  While the recording was acceptable, it was prone to any noise produced in the room or pressing recorder buttons.

L87 Buttons and Ports (Source:  L87 Voice Recorder Instruction Manual)

Battery and storage capacity will not likely be a problem, as this device will continue to operate for many hours when properly prepared for use.

The device records in stereo, which likely doubles the file size for our purpose of generally needing only monaural recording.  I have not found a way to change it.  On the other hand, I recorded some classical music content from a local stereo FM station and connected the recorder to a nice set of shelf speakers for playback.  The sound quality of the MP3 file at 128 kbps was excellent, at least to my ears.

The display is quite small, but very sharp and colorful showing essential information such as file name, time, file format, bit rate, and volume setting.

File management is neither intuitive nor very versatile.  I could not find a way to create new folders or move files using the recorder.  Connecting the recorder to the computer, I could create new folders which were recognized in the recorder’s folder function, but the display would indicate an incompatible format when I tried to save a new file to the computer-created folders.  The recorder would however play prerecorded files transferred to the new folder by the computer.  Lesson:  just stick with the basic file functionality and save the manipulations for the computer.

The recorder comes with a USB-C cable which is used to recharge the battery and transfer files to or from a computer.  Or, if the included SD card is used for storage, it can be removed and used on the computer for file transfer.

As a retired technical writer, I tend to be quite critical of user manuals that come with appliances and electronic gear.  This one is only fair – no better or worse than most others I have come across recently.  We’re not just talking picky grammar issues here.  Some explanations are entirely missing, for example how to properly set the recorder input gain.

File Processing

A few years ago, I used an open-source audio file processing program called Audacity to digitize our collection of vinyl and tapes.  Such applications serve as a quick way to process or edit the recorder files, for example, trimming the files to a desired size or normalizing their amplitude.

Conclusion

In retrospect, there are some things I should have recorded off the radio back in the ‘60s and ‘70s.  But the fact that I’ve enjoyed the radio hobby without a recorder all these years probably does not qualify it as essential equipment in my radio shack.  Useful?  Yes.  If you are interested in recording from your radio, and are a frequent traveler, these recorders are convenient, requiring very little space in the bag.  Because of its small size, hand dexterity and attentive thought processes must be developed to use it effectively.  This recorder has amazing capability, is well constructed, and appears to work as intended.

The Model L87 Voice Recorder on Amazon.com (Note: This affiliate link supports the SWLing Post at no cost to you.)

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John’s In-Depth Review of the Choyong LC90 (Export Version)

Many thanks to SWLing Post contributor and WWLG author, John Figliozzi, who shares the following review:


A Review And Analysis Of The Choyong LC90 (Export Version)

By John A. Figliozzi

General

To my knowledge, this is the first radio to combine AM Shortwave with Internet Radio.  This makes it the first true “full service” radio incorporating ALL of radio’s major platforms.  Many radio listeners question why this hasn’t been done sooner, so this very good first effort is most welcome.

The initial presentation of the radio to the new owner is impressive.  The stylish box in which it arrives is worthy of a respected instrument of high quality.  The radio has the solid substantial feel of a device with excellent build quality.  Its sizing – that of a paperback book along the lines of some previous well-respected AM/FM/SW receivers like the Grundig YB-400 – gives it the perfect form factor for a radio that can be enjoyed both in the home and as a portable.

There is so much to like here.  Over and above its unique combining of Internet radio and shortwave, there’s a “permanent” battery that offers many hours of use before it needs recharging, ATS tuning, the ability to save frequencies and stations in several preference lists, several ways of searching for Internet radio stations, an easy way to add Internet stations not already listed by the manufacturer, and others.

But the LC90 really shines with its fantastic audio on FM and Internet radio.  There’s a woofer, a tweeter and a low frequency diaphragm inside the speaker cavity that occupies the left half the case – and nothing else.  The radio’s excellent build quality and its developers’ efforts to produce a world class audio section in a portable radio really pays off.

But no radio is perfect, and this one obviously is a work in progress.  So, being critical – which is what a review and analysis like this does — should not imply disapproval on any level.  On the contrary, the LC90 is already a well-formed radio worthy of consideration by any purchaser.

The Screen

The screen that is the center of the LC90 provides much information depending on the platform being used.  But in some cases, useful information is missing and in other cases the information provided seems unnecessary or of questionable utility.

In AM (MW), FM and SW, it is not readily apparent what all the symbols mean or why they are there.  The time, signal strength and SNR (signal to noise ratio), bandwidth, meter band, heart (for including a frequency in “favorites”) and the “Freq. vs. Addr.” indicators are all helpful and understandable.  But what is meant by “Memo” isn’t entirely clear.  Is it holding just my preferences?  Or the number of stations found by ATS?  Or something else?

So, too, with the Internet Radio screen.  What do the three dots, the speaker icon and the return icon mean?  The ability to tune stations in sequence as they appear across the bottom of the screen depending on mode is both unique and helpful.  But the use of a timer to tick off how long one might listen to a particular station seems of dubious value.

Some suggestions for better use of the screen in some circumstances are detailed below.

Operation

Initial setup matching the radio to home internet service proceeded flawlessly.  The time clock is in 24-hour mode and showed correct time and date in my time zone.  Some purchasers had previously noted that the clock showed a time one hour earlier than the actual time.  I surmise that this is because the clock remains in standard time year-round.  There is no facility to reset the clock, compensate for seasonal time changes or set the clock manually.  This is an oversight that should be addressed.

This is a sophisticated, multi-faceted radio.  As impressive as it already may be, it should be perceived as a work in progress in need of the improvements it will get eventually through firmware updates and design modifications.  It would be helpful if those updates could come directly and seamlessly through the Internet, something that apparently can’t be done currently.

The LC90 comes with a rather short, almost cryptically worded pamphlet.  This can serve as an ok quick start-up guide.  But after using the radio, it’s obvious that there’s need for a comprehensive operation manual with copious directions for the user, along the lines that Eton provided for the E1.  A radio of this quality and at this price point demands such consideration.

In short, becoming fully familiar with and comfortable using all the features of the LC90 requires a prodigious learning curve, one that is not intuitively discerned.  I have to say that even after using it almost constantly for a few weeks, I feel I am still missing things.

Just a few examples of aspects that go unexplained include:

  • What does “Auto Play” mean in Settings?
  • Getting to preferences (the “heart” icon) is confusing and I’ve inadvertently removed them without learning how it happened.
  • Why does the screen show “Please add radio channel first” when I think I’ve already done that?
  • Why does screen alarmingly show “Saved channels removed”, having done so when I press the tuning dial thinking I am obtaining a list of my preferred or saved stations?

The cleverness behind the LC90 is not intuitively apparent.  If I hit the wrong keys in combination or hard press instead of soft press a key, I get a result I don’t understand and for which there is no explanation in the exceedingly short manual provided now.  In some cases, I put myself in a corner I can’t get out of, so I must reset by shutting down and restarting the radio to get back to base.

Following are my observations on the performance of the LC90 by platform:

FM

The LC90 has a very good FM section that is quite sensitive.   Using the ATS feature, (automatic tuning) it found 37 stations in Sarasota FL, for example.

For its size – and even considering many larger radios — the LC90 has an excellent audio response on FM.  However, although it has activated stereo capability, it does not appear to actually provide stereo through its ear/headphone jack. This is because the same output is used to provide audio to the speakers and the ear/headphone jack.  This feels like an oversight that should be rectified.  The radio does “recognize” a stereo plug and audio does play into both ears.  It’s just not stereo audio.

As currently configured this LC90 does not offer RDBS (RDS in Europe) on FM.  This should be incorporated into a radio of this quality being offered at this price point.

Even so, in this user’s opinion it earns a 4.5 on scale of 5 on FM.  But if it had stereo and RBDS, it would easily earn a 5.

A question arises:   Were HD Radio (in North America) and DAB+ (in Europe and Australia – if these are targeted markets for the LC90) considered for incorporation into this radio by its developers?  If not, why not; and, if so, why was a decision taken not to include them?

Shortwave

Performance of the LC90 on shortwave is very good, especially since it clearly is not intended as a hobbyist’s DX machine.  As such in my opinion, it doesn’t require the SSB capability that some have said they wish it has.

Rather, this radio is intended for the content-focused listener.  I view the AM (MW), FM and SW platforms as back-up alternatives for and secondary to the primary focus — Internet Radio.  Nonetheless, the LC-90’s performance is above average on both FM and SW which should be assuring to anyone considering its purchase.

The LC90 is quite sensitive on SW for a small portable using just its built-in expandable and rotatable 9 stage rod antenna.   But it does especially well when a common clothesline reel external antenna is extended and plugged into the receptacle provided for that purpose on the radio’s right-hand side.  (Similar improvement is noted for AM (MW) and FM, as well.)

Complaints about placement of this receptacle close to the tuning knob is of no concern when an external antenna of the type described above using a 3.5mm plug connector is used.  Any more sophisticated an external antenna would likely overload this radio considering that “birdies” – false signals internally generated by the radio itself — can be detected throughout the SW spectrum even when just using its built-in rod antenna.  This flaw should be addressed in any future modification or upgrade.

The audio enhancements made on this radio through unique use of speakers and their orientation are not as apparent here as they are when listening to FM and Internet Radio.

On AM signals generally — both SW and AM (MW) – a listener can detect artifacts in the audio.  Audible random “clicks” often can be heard – usually when receiving weaker stations – which sounds as if the radio’s audio section is clipping.   Adjusting the bandwidth appears to offer only minimal help with this.

Indeed, the audio produced by SW and AM (MW) sounds somewhat mechanical except on very strong stations.  It seems to lack body or depth on SW and AM.   Some of this undoubtedly is due to the quality of AM audio to begin with.  But the latter does sound more natural on other receivers.  The 7 bandwidths provided (1, 1.8, 2, 2.5, 3, 4, 6 kHz) do help to somewhat shape the audio, but it appears that there could be better choices for what this radio is trying to achieve.

Nonetheless on SW, the LC90 rates a comparative 3.75 on a scale of 5 for sensitivity off its built-in antenna.  That rises to a 4.0 when the external antenna described above is connected.

An unrelated anomaly was noted from using the radio on SW:  The LC90 (or at least this test unit) apparently cannot be tuned directly to frequencies in the 25 MHz (11m) band.  The radio will only accept 4 integers here, so it reverts to 120m instead of 11m.  Instead, one must press the tuning knob to change the display to 11m and then tune manually via the knob to the desired frequency.

AM (Mediumwave)

All Internet-capable radios up to now have avoided including AM – both MW and SW – into their designs due to noise and interference issues generated by the radio’s internal control signal and screen, and the difficulty involved in shielding both.

While acknowledging the considerable effort put forward by the LC90’s developers to ameliorate this problem, the radio does not fully overcome these challenges to producing “clean” AM audio.

The developers themselves seem to recognize this problem.  While they have incorporated an internal ferrite MW antenna in the radio’s design, its utility is overwhelmed by internal interference.  Rotating the radio to emphasize or null certain signals yields no apparent difference.  Consequently, the developer suggests that the listener extend the internal rod antenna for “best results”.

The AM (MW) section is unfortunately the weakest aspect of this radio.  Daytime reception is very poor – rated comparatively a 1.5 on a scale of 5.  The LC90 receives and saves through ATS only very local stations and misses several of them.

Reception does improve after dark, largely due to skywave propagation.  But it is only comparatively fair – 2.5 on a scale of 5.

Using the external clothesline antenna described above improves daytime reception to a 2.0, but those purchasing this radio should expect only marginal pedestrian – even comparatively substandard — results with AM (MW).

In sum, the audio improvements the LC90’s developers have successfully worked to provide elsewhere in the LC90 are almost undetectable here unless one is listening to an exceptionally strong AM (MW) station.

Internet Radio

To this observer, this is the core of the LC90.

There are three equally important tasks that an Internet radio must achieve to serve as a quality example for the genre:

  • Stability of signal reproduction,
  • Superior audio quality,
  • Easy user interface.

Let me begin by pointing out that it is readily apparent that the developers put lots of work into this aspect of the LC90.

The stations that do play successfully sound very good with excellent stability.  But compared to other internet radios I own and have experienced, there are just too many stations that lack that stability (characterized by frequent audio breaks or “hiccups”) or don’t load at all.

Here are some specific observations from use over several weeks:

Simply put, the user interface needs work.  While the LC90 offers several flexible tuning assists, there seem to be too many that overlap and others missing.  The effort does not seem to be centrally focused enough.  For example, listings within each category appear randomly, and many unexplainably with what looks like the same links that are indistinguishable and scattered throughout a given category.

Indeed, there are many individual listings that are repeated within the same and different lists which are found via the Tag, Menu, News. Music, Language buttons on the radio.  Why?  Is it to provide different codecs or levels of streaming quality?  There is no indication as to the way each might differ one from another, if at all.

As mentioned earlier, there is much going on here that cannot be intuitively discerned by the user/listener — and it must be!  Comparing it to other Internet radios such as the Pure Elan Connect, which uses the constantly updated Frontier Silicon station and podcast database, the LC90’s Internet radio operation is confusing and the logic behind it is difficult to perceive.

Some stations appear in Chinese and Cyrillic script, and others just as dots across a line.  This is unhelpful to listeners outside these cultures.  Also, there appear to be features within the LC90’s architecture that are “hidden”.  For example, through an inadvertent combination of key presses I found myself briefly in a listing that appeared designed solely for the Chinese market until I reset the radio by turning the radio off and then on again.

The developers appear to have created their own stations database rather than use one of the others already in use on other Internet radios.  Since it is apparently an entirely new approach, it’s impossible to determine if it is continuously updated, systematically modified or updated periodically according to some schedule.  This observer did not see any activity or change that would indicate that anything was updated over the weeks he was using the LC90.

Many domestic BBC links (Radio 3,4,5,6, e.g.) just don’t work.  When ostensibly “loading” them after selecting them, the percentage just stays at zero.  Given the importance of the BBC internationally, this is concerning and should be corrected with all deliberate speed.

In fact, this observer experienced an inordinate number of links that didn’t seem to work at all.  Some links also play initially, but then just “hang” or stop working or “hiccup” periodically (RTE, RTHK, e.g).

When comparing the LC90’s admittedly many offerings with those on Internet radios using the Frontier Silicon database, many stations appear to be missing.  However, the LC90’s developers have included in the radio’s architecture a very accessible means for the radio’s users to add stations that are not already in the radio’s database.  Whether these are just added only to the user’s radio or added globally to the LC-90 database is unknown.

In short, the way these lists — and the way the user tunes them in — work now appear to detract from rather than enhance the performance and user’s overall experience with the LC90.  This situation leads this observer to the perception that the developer’s concept(s) behind station lists and tuning is unfocused and disorganized.  This situation cannot be allowed to continue.  As stated, this user interface needs reconsideration and refinement in the opinion of this observer to make its use more intuitive for the user.

The LC90’s display for Internet radio is attractive but supplies only stream loading percentages and the station name.  There is no means of knowing the actual quality of the audio signal other than by ear.  The timer provided counting how long the station has been playing is not really of any practical use when listening to an Internet radio station.

A better use of the LC90’s screen would be to include visuals like station logos and station-provided metadata, neither of which are present now.

An anomaly that came to light through use:  The “Podcast” button only seems to provide stations like other buttons, not podcast lists.  This observer could find no way to access or listen to podcasts.  Again, this needs to be corrected.

In the opinion of this observer, the Internet section of the LC90 earns an overall 3.5 on a scale of 5 with the proviso that the radio’s audio performance with the highest quality Internet streams earns a clear 5.

Bluetooth

The LC-90’s Bluetooth feature works well.  Audio volume is jointly controlled by the source and the radio.  Its set-up and operation appear seamless.

TF and SIM cards

Not tested.  Since most SIM cards are tied to phones here, I anticipate that Internet access for the LC90 Export Version will remain with WiFi for the vast majority or, when and where WiFi is unavailable, by linking one’s phone to the radio using Bluetooth.

Neither was the timer or sleep function tested, but it can be assumed that both work as they should.

Final Notes

Other reviewers have expressed a desire for an air band, SSB capability and a fold out strip on the rear of the radio’s case so that it might be angled when used.

Frankly, I don’t see the need for any of these with the LC90 or any future enhancement or modification of it.  Anyone wishing to angle the receiver can find an inexpensive tilt stand on which to place it.  But, in that regard, I would suggest that the developer recreate the rod antenna so that it clears the perimeter of the case and allows it a full 360-degree rotation.

Otherwise, my preference would be that any such effort and the resources necessary to pursue them be concentrated on the more important matters I highlight for improvement in this analysis.

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VIS: The End of an Era

Many thanks to SWLing Post and SRAA contributor, Dan Greenall, who shares the following guest post:


The End of an Era

by Dan Greenall

Many of us can remember the many radio telephone stations that could be found outside the regular SWBC bands during the 1970’s and 80’s and even into the 1990’s. They often ran repeating “voice mirrors” to help the receiving station tune them in prior to handling actual traffic. Some of these also operated within the designated maritime (ship to shore) frequencies.

One such station was coastal radio VIS from Sydney, Australia and they could frequently be heard here in southern Ontario, Canada on both SSB or CW modes. I received their attractive QSL card for reception in 1972.

However, with the advent of satellite and internet communications, these type of stations began to disappear from the HF shortwave bands.

On Christmas day in 1998, I happened to tune into the attached repeating transmission. This station is presumed to be maritime radio VIS in Sydney, Australia on 13083 kHz. The recording was made at Thamesford, Ontario, Canada on December 25, 1998. The repeating message was “The number you have called is not in service. Please check the number you have dialed. If you require further assistance, please call 1225.” 1225 was the number for International Directory Assistance in Australia.

Audio:

Internet research indicates that VIS discontinued its CW service in 1999. I believe the station completely closed down in 2002.

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Frans Receives Amsat QO-100 Es’hail2 stationary satellite

Many thanks to SWLing Post contributor, Frans Goddijn, who shares the following guest post:


Es’hail-2 Geostationary Satellite – credit Es’hailSat (via Amsat-UK.org)

Receiving sounds from the Amsat QO-100 Es’hail2 stationary satellite

by Frans Goddijin

Over the last 1-2 years several radio enthusiasts have mentioned the Amsat QO-100 Es’hail2 stationary satellite but so far I had no clue where to begin receiving signals from it. There seems to be no shop selling a complete kit so one has to source and assemble the parts.

Here’s a video (below) about how I did it.

Tije de Jong helped by building me a custom stand for the satellite dish, Hans Holsink (see https://www.youtube.com/watch?v=ZDBIMjCUKtY and www.hybridpretender.nl) gave me some tips over the mail as did William Lagerberg, a fellow radio enthusiast who has built a small forest of antennas around his home.

In preparation, I looked for pages and videos of other setups but often what I found was way too technical for me, or focused on one or two aspects while skipping over everything else.

So I gathered material from different sources, gleaned information from several websites and videos.

But above all I had the help of Tije, Hans and William who enabled me to get there.

One shortcut that I thought I was taking in the beginning was using an app to get the dish lined up but as it turned out the app seemed to think the satellite was playing hide and seek, sometimes in plain sight across the street and then slowly disappearing around the corner. 😉

Also, I used LiDAR measurement in the app to establish what size and type dish I had bought (a cheap no-brand thing in a store where immigrants buy satellite dishes to watch homeland TV) but later on Tije pointed out to me that the dish on the app screen looked nothing like mine which explained why the orientation tool of the app had me pointing the dish ever higher.

Once I used the information on https://eshail.batc.org.uk/point/ I got going and lining up the dish was easy.

Video:

[I also] made a second video this time highlighting the simple details of the setup so others can easily copy the approach:

Best regards,

Frans

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Guest Post: Bob’s conundrum with the Radio Data System (RDS)

Many thanks to SWLing Post contributor, Bob Colegrove, who shares the following guest post:


A Conundrum with the Radio Data System (RDS),
or Why I Set the Clock Manually

By Bob Colegrove

There’s an old story about a man who owned two watches.  One watch ran but lost a minute every hour.  The other watch didn’t work at all.  He always wore the watch that didn’t work, because as he said, “At least it will have the correct time twice a day.”

First off, a couple of caveats.  This is not a definitive description of the Radio Data System (RDS).  I leave that to much more knowledgeable sources.  One detailed description is at https://en.wikipedia.org/wiki/Radio_Data_System.  Second, my experience described here is confined to the Eton Elite Executive and the XHDATA/SIHUADON D-808.  Other radios may operate differently.

I have surrounded myself with several multiband travel radios over the past year and enjoy them very much – each for different reasons.  Besides listening, I like to push buttons to see what happens.  The manuals?  At best they occasionally provide a clue.  I read them, eventually filling in the blanks on my own.

XHDATA/SIHUADON D-808

Basic RDS

What is RDS? RDS is a system which enables an FM station to transmit various fields of information such as date, time, call letters, frequency, and program information in text form.  The call letters are useful, but if you have a digital radio, you already know the frequency.  The name of the song and artist are particularly helpful if the DJ won’t tell you.  As for the date and time, well, I’ll get to that.

RDS is an international standard and Radio Broadcast Data System (RBDS) is the official name used for the U.S. version.  So why don’t we in the States just call it RBDS?  Probably because our radios aren’t made here.

Eton Elite Executive

The XHDATA and Eton allow the user to display four of the several fields comprising the RDS standard.  They each step through the same sequence, indicating a similar or possibly the same demodulator chip.

PS and RT seem to be freeform fields with stations providing whatever information they want to share.  Often the call letters and frequency are contained here, along with program content.  Clock Time (CT) is not displayed per se, but is used to set the radio time, and is included as part of the DATA field.  DATA is important; it has four elements, which should provide the listener with an indication of the call, day, date, and time being received by the radio.  The international RDS standard omits the call letters.

The RDS information transmitted by any given station may not contain all the fields identified above, including the time.  For example, stepping through the fields you may encounter “NO PTY,” “NO PS,” “NO RT,” or “NO DATA.” Consequently, you may tune in to a station broadcasting RDS and wait a long time for the radio clock to synchronize, which it never does.  The display of any content in the DATA field is probably the best clue whether CT is being transmitted.

It is interesting that the Eton is programmed for the US RBDS system, whereas the XDATA follows the international RDS system.  For the international system on the D-808:

  • “DATE” replaces “DATA” in the display.
  • The call letters are omitted from the DATE field.
  • The terms in the PTY field differ; for example, WRBS, 95.1 MHz, the PTY element displays “SOCIAL” instead of “RELIGIOUS MUSIC.”

International PTY RDS term on the XHDATA

US PTY RBDS term on the Eton

The Conundrum

The mischief all began when I got my XHDATA D-808 and tried to program the clock to automatically update using the RDS information off FM stations.  Minutes seem to display correctly, but try as I might, I couldn’t get the hours to register properly.  Then I bought an Eton Elite Executive.  It also has the RDS feature, so I tried again.  It appeared to work OK for a day or so.  Then the hour indication started to misbehave.  In addition to the clock, the Eton allows programming of time zones and day of the week.  I determined that the erroneous indication did not appear to be related to GMT, EST, 12-hour or 24-hour format settings.  In theory, if you try to set your radio to GMT or some other time zone, the RDS time from a local station should override it.

When I tested the radios side-by-side, the DATA field was fraught with problems on both radios.  Several local RDS stations containing CT were monitored.  The whip antenna was extended a tad, as the information may not reliably register with some otherwise clear audio signals.

  • When tuned to the same station, there were occasional inconsistencies between the two radios, presumably receiving the same exact information from the station.

 

  • Sometimes the hour would not advance on the XHDATA after minutes transitioned from 59 to 00.
  • Curiously, both radios might exhibit the correct date and time during the day, then at 1900 EST, several stations on both radios prematurely advance to the next day and date, and the hour would display incorrectly, completely unrelated to local hour.  Minutes may or may not be correct.  1900 EST happens to be 0000 GMT.  Are some station clocks running on GMT?

RDS content obviously requires some attention at the station.  In the end, they are responsible for the information going out.  In fairness, with all that goes on in a studio and limited staffing, RDS content may not be a priority.  As an example:

  • Call letters in the DATA field for local WMZQ read KZQK, which is not assigned.

Conclusions

There are two main factors which may impinge on the accuracy of a radio clock when set automatically by the RDS:

  • Accuracy depends on the station transmitting it correctly.
    • With RDS set to the AUTO mode, there is a good chance that the clock will be updated repeatedly as the radio is tuned among various stations – not necessarily to the correct time.
      • For the Eton, the clock would reset each time when changing stations between WTOP (correct time) and WPRS (incorrect time).
      • For the XHDATA, the clock would reset each time when changing stations between WTOP (correct minutes) and WPRS (incorrect minutes).  In both cases, the displayed hour remained 00.
    • There is still the unexplained premature update of day and date by some stations observed on both radios.
  • Correct time depends on the radio’s RDS demodulator to interpret the incoming data.

Trivial?  Perhaps, but you may want to reconsider and program the clock manually, particularly if you depend on the alarm function of the radio to get to work on time.

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Back When You Had to Pay: Radio Receiving Licences in Canada

Many thanks to SWLing Post and SRAA contributor, Dan Greenall, who shares the following guest post:


THE DAY YOU HAD TO PAY: Radio Receiving Licences in Canada

by Dan Greenall

MANY of us who are licensed [Canadian] amateurs can appreciate the fact that we are no longer subject to an annual licence renewal fee. As of April 1, 2000, that practice was discontinued by Industry Canada as a new streamlined authorization procedure was put in place for the amateur radio service. This came as a pleasant surprise to many who were paying $24 per annum per licence up until that point.

What many of us may not realize is that, prior to 1953, Canada had a licensing system in place for your radio receiver. Under the Radiotelegraph Act of 1913, a government minister (for most of this period, the Minister of Marine and Fisheries) had the power to license radio broadcasting stations and to charge a $1 licence fee on each receiving set. By 1929 three hundred thousand licenses were bought at $1.00 each.

An article appearing on the Friends of Canadian Broad- casting website a few years ago stated that the annual licence fee for receiving sets doubled to $2.00 in 1930. It was also noted that this was a lot of money during the Depression days that followed and two bucks could buy more than 40 loaves of bread. As a result, so the story goes, “harassed citizens” would try to outwit approaching government collectors by passing word along in time for their neighbours to shut off their radios and lock their doors.

During much of this period, radios that were made in Canada bore a “Warning” sticker such as the one in the accompanying photo. It stated that anyone convicted of operating the receiving set without first having obtained the proper licence could be liable to be fined for up to $25 and have their equipment confiscated. As noted in the book Radios of Canada by Lloyd Swackhammer, the penalty in 1924 was $50.

As you can see from the attached copies, such licences were being issued by the Department of Marine Radio Branch in 1936. In 1937, it was the responsibility of the Department of Transport – Radio Division.

Then in 1938, the DOT upped the fee to $2.50. It was another 15 years until this practice was finally abandoned.

So the next time you sit back and flip on the switch of your receiver, you might now have a greater appreciation of a privilege that most of us now take for granted.

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Carlos’ Experience and Motivation for Receiving Kydodo News via Radiofax

Many thanks to SWLing Post contributor, friend, and political cartoonist Carlos Latuff, who shares the following guest post:


My experiences receiving Kyodo News

by Carlos Latuff

Back in the 90s, I used the fax machine a lot, I even had one in my house, sending messages and cartoons to my clients and even to live TV shows (see the video example below). Lots of fun!

But for me, the fax only worked through the phone line.

It was only in 2020, during the covid-19 pandemic, that I, by chance, during one of my radio listening sessions, came across a strange signal that I would only later discover was a radiofax.

It was then that I realized that several meteorological agencies around the world broadcast synoptic charts and satellite images to vessels on the seas by radiofax, and that there was a Japanese news agency (the only one left in the world) that broadcast daily news to fishing boats and cargo ships: Kyodo News.

I was fascinated by that!

And I started tuning to the frequency of 16971 kHz USB (16970 in fact, to properly receive images) using basically my Xhdata D-808 and its telescopic antenna (now I use a 3-meter long wire antenna).

All the weather agencies I know broadcast at 120 lines per minute, while Kyodo News broadcasts at 60 lines. When I used to have a laptop, I had programs installed where I could adjust this cadence, like MixW, however, using an Android cell phone, the only application that works for radiofax is HF Weather Fax, which only decodes at 120 lines per minute (I had some problems with the app, which, being old, sometimes generated conflicts with Android and crash suddenly or even didn’t even open. Another bug is that after around 40 minutes of continuous decoding, the app stops). When you receive a radiofax at a rate of 60 lpm and decode it at 120 lpm, it’s as if you cut the image in half, vertically, and joined the two parts into one, mixing the letters.

I noticed that, when enlarging the image with my fingertips on the surface of the cell phone, while receiving the radiofax, I was able to see the right and left side of the image at a time, in an effect known in graphic arts as “moiré pattern”.

So, using HF Weather Fax I cannot download a Kyodo News radiofax in full (except when I receive the bulletin in English, the only time Kyodo News broadcasts in 120 lpm), but I can view parts of it and make print screens. And with these prints, I open them on Google translator app translating from Japanese to English. If image is in good quality, the translation is perfect.

Results I got were obtained from radio listening in Porto Alegre, Tramandaí beach in Rio Grande do Sul, and Urca beach in Rio de Janeiro, all located in Brazil. The best time has been late in the morning/early in the morning.

I’ve already obtained digital QSL cards from some meteorological agencies, such as those in Germany, Australia and Kagoshima in Japan, but Kyodo News doesn’t even respond to my emails.

But the main question is: why go to so much work to receive news via radiofax when you can easily receive it on the Internet through the Kyodo News website–?

Firstly, I’m nostalgic, receiving these radiofax has a touch of the past that I like to remember. And second, I believe that with the advancement of new satellite data transmission technologies, it’s only a matter of time before radiofax disappears as means of communication for vessels on the high seas. This is already happening!

Remember the end of radiofax transmissions from the New Zealand meteorological agency MetService this year?

So I’m enjoying the radiofax, before it ends!

The following are reports from some of my listening/decoding sessions: Continue reading

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