Category Archives: Utility

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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Patrizio seeks information about mystery signals he’s discovering across the HF bands

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Many thanks to SWLing Post contributor, Patrizio Cardelli, who has discovered some interesting signals on the HF bands and is seeking information about them.

A little background: Patrizio asked me about these signals a few weeks ago and based on a quick glance at the spectrum and waterfall images I assumed it was DRM (Digital Radio Mondiale). I was wrong, of course. Had I looked at the actual frequency and bandwidth, I would have immediately realized is was not DRM. My email load has been so heavy as of late, and my time to reply at such a premium, I rushed through the reply–my apologies, Patrizio!

Patrizio followed up with this message:

Hello Thomas,

I hope this message finds you well. I wanted to share my recent radio exploration based on your advice. I followed your suggestion and investigated a sample signal within the 60-meter band, specifically settling on the one at 4.962 kHz.

I attempted to decode it using the Dream software but encountered no success. It seems this isn’t a Digital Radio Mondiale (DRM) transmission. To rule out local QRM (interference), I tested various Kiwi SDR receivers across Europe, both to the south and north of my QTH. Interestingly, I managed to pick up this signal everywhere, with a stronger intensity noted in the northern locations.

I’m eager to publish this article to find out if other Shortwave Listeners (SWL) have been able to decode this transmission. Additionally, I’d like to mention that similar signals, either continuous or intermittent, are present on various HF frequencies.

I look forward to any insights or experiences others in the community might have regarding this intriguing signal.

Audio sample:

While I recognize these signals now, and I’m sure most of you who cruise the bands have seen/heard these as well, Patrizio is a relatively new SWL, turns out, and I thought it might be fun exploring just what these signals are.

Readers: If you know what these signals are, please comment. Indeed, I’m sure there are a number of SWLing Post readers who have hands-on time with generating these signals as well in a past life or current career. Let’s explore!

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Announcing DXtreme Monitor Log 14!

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Many thanks to SWLing Post contributor and supporter, Bob Raymond with DXtreme who shares the following product announcement:

Product Announcement

DXtreme Monitor Log 14™

DXtreme Software™ has released a new version of its popular logging program for radio and TV monitoring enthusiasts: DXtreme Monitor Log 14. Its familiar, uncluttered, industry-standard Windows® interface lets listeners and DXers log the stations they’ve heard using features that enhance their monitoring enjoyment.

New Features in Version 14

Signal Modes, Transmission Modes, Grid Square Tracking

We added a Signal Modes field to let users specify the signal mode their receiver is tuned to (for example, AM, CW, FM, LSB, USB, RTTY, etc.) plus a Transmission Modes field to let users specify the transmission mode the station is transmitting (for example, CW, FAX, FT8, HFDL, MIL-STD-188-141A, SSB, STANAG 4285, etc.). And we added Signal and Transmission Mode modules to let users maintain tables of signal and transmission modes.
We added a Transmission Mode Details box to allow users to type free-form information about the transmission mode received, such as baud rate, bandwidth, etc. (for example, 1200bps/L). New Log Variables enable users to share Signal, Transmission, and Detail mode information so readers (and users) can reproduce the monitoring environment and log (or relog) the stations. Here are two examples: “1200bps/L STANAG 4285 crypto tfc on USB” and “MIL-188-110A/B continuous mode idle on LSB.”
We added support for tracking Maidenhead grid squares, which is useful when monitoring/logging stations not located in traditional countries, like aircraft and ships operating in international airspace and waters. Grid squares are calculated from specified latitudes and longitudes. Both Performance and Stations reports let you track grids. Search functions let you find log entries for viewing or editing based on their grid squares.

Verification By Improv Imaging

Similar to the legacy Verification By Audio feature, where the presence of an audio file in a log entry designates the station as “Verified By Audio,” we added a Verification By Improv Imaging feature which counts the station as “Verified By Improv Image” if the Shows ID check box on the Improv Imaging tab is selected, indicating the presence of an ID on the window of a captured digital software application (such as PC-HFDL). Performance, Stations, and Log Entries reports let you track verifications by traditional QSLs, presence of Audio files, and presence of Improv Images for which the Shows ID check box is selected.

Schedule Checker Monitoring Advice and Tuning

When Schedule Checker advises users to monitor a station for a new or verified Country, it does so now for the Class (SWBC, Ute, Ham, etc.) and QSL Type (Verified By QSL, Audio, or Improv Image) selected in Properties. The foreground and background colors that indicate the Schedule Checker’s monitoring advice can be defined by users in Properties. The colors appear in an upgraded legend on the Schedule Checker.
Users can now tune their radios to the schedule item’s signal mode and frequency by selecting the desired signal mode in the Signal Mode list box and double-clicking the schedule item.

Solar Indices Enhancements

Acquisition of current solar indices has been improved on the Monitor Log and Schedule Checker windows. • Editing of solar indices has been added to the Monitor Log window for when NOAA is down.
We restored historic solar indices adjustments based on date and time changes made on the Monitor Log window provided users have downloaded historic solar indices from the NOAA FTP site into the Solar subfolder. An interface is provided on the Edit menu of the Monitor Log window for this FTP activity.

For more information about New Features, click https://www.dxtreme.com/monitorlog_whatsnew.htm.

Standard Features

Logging Stations

Monitor Log 14 lets users log all kinds of stations: radio, television, broadcast, utility, Amateur Radio, military, etc. across the radio spectrum.

Finding Stations to Monitor

The Schedule Checker lets users import schedules from Aoki, EiBi, and FCC AM web sites and display broadcast schedule data according to the filter criteria they specify. Users can filter schedule information by band, frequency, station, country, time of day, language, and more. EiBi schedules also include utility stations.

For each schedule item, Schedule Checker queries the Monitor Log 14 database to let users know – through user-defined, foreground and background display colors – whether they need to monitor a station for a brand new or verified country. The colors appear in a legend on the Schedule Checker window. When Schedule Checker advises users to monitor a station for a new or verified Country, it does so for the Class (SWBC, Ute, Ham, etc.) and QSL Type (Verified By QSL, Audio, or Improv Image) selected in Properties.

Reporting Reception

Users can create customized paper and e-mail reception reports for sending to stations plus log entry data shares for reporting catches to clubs and magazines. Using the Script Editor window, users can create and edit scripts that format reception reports, eReports, and shares to their liking. The software prompts users to select the script they want to use. Dozens of scripts come with Monitor Log 14. Users can also send eQSL requests to hams automatically via the popular https://www.eqsl.cc site and update their databases with downloaded eQSL.cc Inbox records.

Imaging

Improv Imaging lets users associate ad hoc images with log entries using Capture, Scan, and Clipboard functions. Captures of stations received on digital applications, waterfall displays, facsimile and Amateur TV pictures are popular. The Improv Imaging tab and Application let users view images anytime, and an Improv Image Explorer lets them peruse their entire collection and display associated log entries. A QSL Imaging facility functions the same as Improv Imaging for associating QSLs.

Other Features

Rig Control — Retrieves the frequency and mode from supported radios and permits tuning from the Schedule Checker and Direct Tune. Rig control is provided through integration with Afreet Omni-Rig (http://www.dxatlas.com) and CAT for SDR applications like SDR Console (https://www.sdr-radio.com) and SDRuno (https://www.sdrplay.com).
Audio Archiving — Lets users maintain an audio archive of stations heard.
Reporting and Searching — Produces Performance, Stations, and Log Entry reports that track the performance and progress of the user’s monitoring station and provides criteria-based log entry searches.
Documentation — Context-sensitive Procedural Help, Field Help, and Microhelp are accessible on every window to provide instructions quickly. Installation Instructions and a Getting Started Guide also included.

Supported Operating Systems, Pricing, Contact Information

DXtreme Monitor Log 14 runs in 32- and 64-bit versions of Microsoft® Windows® 11, 10, 8.1, 8, 7, Vista® XP. Retails for $94.99 USD for Internet distribution (discounted pricing for upgrades available). Product support by Internet e-mail. For more info, visit (https://www.dxtreme.com) or write [email protected].

SWLing Post readers should note that DXtreme was one of our first company supporters. Their ad revenue helps bring the SWLing Post to you daily. Thanks, DXtreme!

Click here to check out DXtreme Monitor Log 11.

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Carlos’ Art and Recording of a NOAA Weather Bulletin via the US Coast Guard

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Many thanks to SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares his radio log art of a recent NOAA Weather Bulletin from the US Coast Guard:

Carlos writes:

NOAA bulletin (partial), US Coast Guard, Chesapeake, VA, 13089 kHz USB, high seas forecast and hurricane information. Listened in Porto Alegre, Brazil.

Carlos’ listening post and gear.

Click here to listen via YouTube.

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Guest Post: Monitoring Digital Selective Calling (DCS) with YADD

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Many thanks to SWLing Post contributor, Don Moore–noted author, traveler, and DXer–for the following guest post:

Monitoring DSC with YADD

By Don Moore

(The following article was originally published in the April/May 2022 edition of the Great Lakes Monitor, bulletin of the Michigan Association of Radio Enthusiasts. An all-band listening club, MARE publishes a bi-monthly print bulletin and a weekly e-mail loggings tip-sheet. The club also holds regular get-togethers, picnics, and DXpeditions, generally in southeastern Michigan.)

There are dozens if not hundreds of different digital modes used for communication on the MF and HF bands. These aren’t broadcasts you want to listen to unless you like to hear weird tones, beeps, warbles, and grinding noises interspersed with static. Digital modes are for monitoring, not listening. And monitoring them requires having software that does the listening for you and converts the noises into something meaningful – like the ID of the station you’re tuned to. The learning curve to DXing digital utilities can be steep. There are lots of modes to identify and the software can be complicated to learn. Some broadcasts are encrypted so you can’t decode them no matter how hard you try. But the reward is lots of new stations and even new countries that you wouldn’t be able to add to your logbook otherwise.

One of the easiest digital modes to DX is DSC, or Digital Selective Calling. DSC is a defined as “a standard for transmitting pre-defined digital messages.” Look online if you want to understand the technical specifications that specify the values, placement, and spacing of the tones. The result of those specifications is a string of three-digit numbers like this:

125 107 125 106 120 105 120 104 000 120 022 120 041 000 002 022 020 041 108 002 053 020 080 108 006 053 021 080 070 006 118 021 126 070 126 118 126 126 126 126 126 126 126 126 126 126 117 126 112 126 117 117 117 112 109 125 108 125

Each three-digit value represents either a digit or a key word and the positions of the values map to the various fields contained in the message. This message, which was received on 8414.5 kHz, is a test call from the tanker Brook Trout to the coastal station Coruña Radio in Spain. The sender and destination are not identified by name but rather by their nine-digit MMSI (Maritime Mobile Service Identity) numbers – 538006217 for the vessel and 002241022 for the coastal station.

GETTING STARTED WITH DSC

Logging DSC stations requires three pieces of software. First you need a decoder program that turns the noises into numbers and the numbers into meaning. There are several free and commercial options but the most popular one for beginners is YADD – Yet Another DSC Decoder. YADD is free and easy to set up and while YADD can be used by feeding the audio from a traditional radio into your computer, the most common use is with an SDR. That’s what I use and what I will describe here.

Second you need an SDR application and an SDR. I prefer HDSDR for most of my SDR use but I like SDR-Console for digital work. But any SDR program will work if you can feed the audio to a virtual audio cable. And that’s the final thing you need – a virtual audio cable to create a direct audio connection between your SDR application and YADD. There are several different ones available but I recommend VB-Cable. Your first VB-Cable is free and that is all you need to run a single instance of YADD. If you want to expand you can buy up to four more cables from them later. Continue reading →

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Carlos’ Shortwave Art and Recording of Okinawa Fishery Radio

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Many thanks to SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares yet another example of his radio log art, this time for Okinawa Fishery Radio. Carlos notes:

Okinawa Fishery Radio Station, Okinawa, #Japan, 8761 kHz (USB), broadcasting weather reports and navigation alerts to Japanese fishing boats.

Heard in Porto Alegre, Brazil, Feb 9, 2022, 08h59 (UTC).

Click here to listen on YouTube.

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Guest Post: An Introduction to DXing the MF Marine Bands

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Many thanks to SWLing Post contributor, Don Moore–author of Following Ghosts in Northern Peru–for the following guest post:

Monitoring the MF Marine Bands

By Don Moore

For me, DXing has always been about the challenge of receiving difficult-to-hear radio stations, regardless of the type of station or frequency range. In my five decades in the radio hobby I’ve logged a lot of different kinds of stations – shortwave broadcast, medium wave, shortwave utility, longwave beacons, etc. But some of my favorite catches have been in the upper end of the medium frequency range.

Technically speaking, medium frequency (MF) is the range from 300 to 3000 kHz and includes the standard medium wave (AM) broadcast band. The upper end of the MF band, from 1600 to 3000 kHz (except for a small portion reserved for amateur radio), has always been assigned to various types of utility uses including broadcasts and other voice communications from regional maritime stations. And while digital modes and satellites have done a lot to change the nature of communication with ships at sea, there is still a lot of good human-voice DX to be heard.

Several dozen stations, mostly in Europe and North America, broadcast regularly scheduled marine information broadcasts in the MF range. These broadcasts are usually between five to ten minutes in length and include weather forecasts, navigational warnings, and other notices to keep ships at sea safe. On occasion it’s possible to hear two-way voice communication here between ships and shore stations, although that’s much less common today.

The Equipment

Nothing special is needed to DX the marine MF band other than a receiver that covers the frequency range and can receive USB mode (which all these broadcasts are in). However, for reasons explained below, I highly recommend using an SDR to make spectrum recordings of the entire band to go through later. Continue reading →

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