AmateurRadio.com

HM - 221 kHz Hamilton, Ontario

This coming weekend will see another CLE challenge. This time the hunting grounds will be all inclusive: 190-1740 kHz. As well, there are two options, HOME and DX as explained below.



For those unfamiliar with this monthly activity, a 'CLE' is a 'Co-ordinated Listening Event', as NDB DXers around the world focus their listening time (usually) on one small slice of the NDB spectrum.

Summertime CLEs can often be challenging, not because of poor propagation but more likely, summer lightning storms ... hopefully it will be quiet for your location.

When tuning for NDBs, put your receiver in the CW mode and listen for the NDB's CW identifier, repeated every few seconds. Listen for U.S. NDB identifiers approximately 1 kHz higher or lower than the published transmitted frequency since these beacons are modulated with a 1020 Hz tone approximately.

For example, 'AA'  (Fargo - ND) transmits on 365 kHz and its upper sideband CW identifier is tuned at 366.025 kHz while its lower sideband CW ident can be tuned at 363.946 kHz. Its USB tone is actually 1025 Hz while its LSB tone is 1054 Hz.

Often, one sideband will be much stronger than the other so if you don't hear the first one, try listening on the other sideband.

Canadian NDBs normally have an USB tone only, usually very close to 400 Hz. They also have a long dash (keydown) following the CW identifier.

All NDBs heard in North America will be listed in the RNA database (updated daily) while those heard in Europe may be found in the REU database. Beacons heard outside of these regions will be found in the RWW database.

From CLE organizer Brian Keyte, G3SIA, comes the usual 'heads-up':


Hi all

Our 222nd Co-ordinated Listening Event, 'DX and HOME', starts on Friday
and runs for an extra day. First-time CLE logs will also be very welcome
of course.

Days: Friday 25th August - TUESDAY 29th August
Times: Midday on Friday to Midday on Tuesday, your LOCAL time
QRG: Normal LF/MF frequencies (190 - 1740 kHz)
NDBs: Normal DX and 'HOME' ones (not DGPS, Navtex or Amateur)

There are two parts (you can listen for either or both of them):

DX:
Please try to log NDBs that are over 2,000 km / 1,250 miles from you.
(If you don't have details of the distances of NDBs from you, please see
the end of this email)

HOME:
If you have any, please log the NDBs in YOUR OWN radio country.
For listeners in AUS, CAN and USA, that means your State or Province.
Our full list of radio countries can be found at:
http://www.ndblist.info/ndbinfo/countrylist.pdf
(If you also mention any of your home regulars NOT heard, it will help
others to know about NDBs, maybe DX to them, that may not be active)

Please post your CLE log to the List in a plain text email if possible,
with 'CLE222' at the start of its title and showing on each log line:

The full Date ( e.g. 2017-08-25 or just the day number 25 )
UTC (the day changes at 00:00 UTC).
kHz - the nominal published frequency
The Call Ident.

Please put those four main log items FIRST, with any other optional
details such as location and distance LATER in the same line.

Your log will be more interesting if you keep the two parts, DX and HOME,
separate in it. Any UNIDs that you come across will also be of interest -
in a separate, third, part of your log please.
If you send interim logs, please make sure that you also send a 'Final' log
showing ALL your loggings for the CLE.

I will send the usual 'Any More Logs?' email at about 17:00 UTC on
WEDNESDAY so you can check that your log has been found OK.
Do make sure that your Final log has arrived on the list by 08:00 UTC
on Friday 1st September at the very latest.
Joachim hopes to complete the combined results on the Saturday.

Good listening
Brian
----------------------------------------------------------
From: Brian Keyte G3SIA ndbcle'at'gmail.com
Location: Surrey, SE England (CLE coordinator)
----------------------------------------------------------

(If you wish you could use a remote receiver for your loggings,
stating its location and owner - with permission if required.
A remote listener may NOT also use another receiver, whether
local or remote, to obtain further loggings for the same CLE.
The HOME radio country and the distances would be based on
where the receiving equipment is located)

DISTANCES TO NDBs FROM YOUR LOCATION

The Great Circle program GcmWin by SM3GSJ can produce a nice great circle
map centred on your location - see http://www.qsl.net/sm3gsj/

Users of Michael's NDB Handbooks will already have their distances and
bearings to the NDBs.

Alex's WWSU program has a facility to create a map showing the areas
inside the 2000 km circle.
To create this,
click on 'Tools'
click on 'Station Radar'
select Range from “2000” to “10000” km
select “show NDB stations”
click on “Generate Image”
click on “Save To File”
That will create a text-file containing information on the selected NDBs.

The REU/RNA/RWW Database provides a powerful way of finding which
NDBs to search for:

1) Go to the signals screen using -
http://www.classaxe.com/dx/ndb/reu?mode=signals
If you are in North America, replace the reu above with rna
If you are not in Europe or North America, replace the reu with rww

2) On the Range line, put your *Locator in the 'From GSQ' box (e.g. mine
is IO91tg) The DX fields become enabled when a GSQ is entered.

3) Enter 2000 in the first DX field, leave the second blank and leave the
units as 'km' (or use 1250 and 'miles', if you prefer)

4) Select 'Only Active' and press 'Go'.
Now you only see NDBs that are over 2000 km from you.

Change 'Show' in the top line to 'All Results'.
The other fields are also active - e.g. you could enter specific States or
Countries in the Location line to limit the search to the NDBs there.
And/or you could click on 'Map', then on 'Go' and uncheck 'Clustering'

*If you do not know your Locator you can quickly find it from your
Latitude/Longitude (and vice versa) by using:
wingrid.exe V4.1 - freeware from W4SM 

These listening events serve several purposes. They:

• determine, worldwide, which beacons are actually in service and on-the-air so the online database can be kept up-to-date

• determine, worldwide, which beacons are out-of-service or have gone silent since the last CLE covering this range

• will indicate the state of propagation conditions at the various participant locations

• will give you an indication of how well your LF/MF receiving system is working

• give participants a fun yet challenging activity to keep their listening skills honed

Final details can be found at the NDB List website, and worldwide results, for every participant, will be posted there a few days after the event. If you are a member of the ndblist Group, results will also be e-mailed and posted there.

The very active Yahoo ndblist Group is a great place to learn more about the 'Art of NDB DXing' or to meet other listeners in your region. There is a lot of good information available there and new members are always very welcome. As well, you can follow the results of other CLE participants from night to night as propagation is always an active topic of discussion.

If you are contemplating getting started on 630m, listening for NDBs  is an excellent way to test out your receive capabilities as there are several NDBs located near this part of the spectrum.

You need not be an ndblist member to participate in the CLEs and all reports, no matter how small, are of much value to the organizers. 

'First-time' logs are always VERY welcome!

Reports may be sent to the ndblist or e-mailed to either myself or CLE co-ordinator, Brian Keyte (G3SIA), whose address appears above.

Please ... give the CLE a try ... then let us know what NDB's can be heard from your location! Your report can then be added to the worldwide database to help keep it up-to-date.

Good hunting!

HAKUNA MATATA

It may not have been the YASME but the recent voyage of the HAKUNA MATATA had all of the radio fun that one might ask for during the mid-summer doldrums! (more later for those too young to recall the YASME)



Crewed by Mark (VA7MM) and YL May (VA7MAY), Toby (VE7CNF) and XYL Nancy, the 31' Benateu recently completed a 14-day circumnavigation of Georgia Strait's Gulf Islands. This is a yearly adventure that has been successfully completed for the past few summers and looks as though it may now be an annual tradition.

Normally, the crew kept up regular radio contact on HF as well as on VHF when possible but this year saw a major departure.

In previous summers, near the end of the voyage, the crew has always visited us here on Mayne Island for an afternoon of vittles and libation before heading for home. There is always a good amount of time spent recalling the past-year's radio activities, winter projects and reminiscence of the 'good old days'. Last year, just as the party was ending, I jokingly suggested that 'next year', it would be cool to work them from the boat on 630m.

Although there was no immediate commitment, I knew that the seed had been planted, and with three of the four crew being engineers, I suspected it might be hard for them to resist, and ... just before departure, the local bunch of 630m ops were put on alert to be watching for CF7MM/mm on 475 kHz CW as they would be attempting to work us from three different overnight anchorages during their summer voyage!

Evidently Toby had been working quietly during the winter to make this become a reality. Here are some pictures of the system along with Toby's (the system's builder) comments.

Variometer and matching transformer

I have attached photos of the CF7MM/MM 630m setup on Hakuna Matata. The lower black toolbox holds a variometer with selectable taps and a matching toroidal autotransformer with selectable taps. At the base of the antenna is another series loading coil.

Wire vertical and loading coil

The antenna wire is 14 ga 38 ft long with plastic Unadilla "END-sulators" at each end. Ground was the boats's cast steel keel and a couple of 30 ft wires near the gunnels. The rig is an IC-746 with my power-mixer transverter. Transmit power was about 20W TPO.

Toby (VE7CNF) working the pileups!

Tuning and matching was done with a resistive voltage divider setup, signal generator, and portable oscilloscope. Once the matching was figured out, I could re-tune the variometer to give a dip on the transverter's RF voltmeter and check that we had the same RF voltage as with a dummy load connected.

Tuneup

The antenna equivalent circuit is approximately 100 pF in series with 27 ohms. Coil losses were 23 ohms for about 50 ohms total load resistance, so the matching autotransformer was not used. The base loading coil is approximately 170 uH and the variometer is 950 uH, for 1120 uH total inductance.

The route, heading north from Vancouver

We tried disconnecting the gunnel ground wires and leaving only the keel, and found that the antenna capacitance and resistance did not change. When we disconnected the keel and left only the gunnel wires, the antenna capacitance dropped to about 87pF and antenna resistance dropped by a few ohms. It appears that the keel provided most of our ground coupling to sea water and it would have been a sufficient ground on its own.

More details of Toby's 630m transverter as well as a practical 630m antenna tune-up procedure can be found on his website here.

All-in-all, I think the 630m operation was a great success and very likely the first-ever 630m marine mobile operation on that band, as I don't recall this happening anywhere else over the years. It was also a great way to pay homage to the band's original maritime heritage where its quality groundwave and skywave capabilities were used to advantage for so many decades safeguarding mariners worldwide.



Maritime mobile operation on the amateur bands has some great history behind it, including the yacht YASME. In the mid-50's, Danny Weil was the first ever amateur to undertake DX'pedition style operations via sailboat, as he visited numerous rare islands in the Caribbean and South Pacific.

Danny on the YASME - courtesy: www.gm3itn.co.uk

Original YASME QSL -  courtesy: http://hamgallery.com/

His exploits were regularly published in CQ magazine at the time and always made for exciting reading as Danny would eventually wreck three YASMES over the years! His adventures laid the groundwork for future island-hopping DX operations such as those undertaken by Gus Browning (W4BPD), Don Miller (W9WNV) and all that followed ... I'm sure they would all have enjoyed working the HAKUNA MATATA as well!

HAKUNA MATATA

It may not have been the YASME but the recent voyage of the HAKUNA MATATA had all of the radio fun that one might ask for during the mid-summer doldrums! (more later for those too young to recall the YASME)



Crewed by Mark (VA7MM) and YL May (VE7MAY), Toby (VE7CNF) and XYL Nancy, the 31' Benateu recently completed a 14-day circumnavigation of Georgia Strait's Gulf Islands. This is a yearly adventure that has been successfully completed for the past few summers and looks as though it may now be an annual tradition.

Normally, the crew kept up regular radio contact on HF as well as on VHF when possible but this year saw a major departure.

In previous summers, near the end of the voyage, the crew has always visited us here on Mayne Island for an afternoon of vittles and libation before heading for home. There is always a good amount of time spent recalling the past-year's radio activities, winter projects and reminiscence of the 'good old days'. Last year, just as the party was ending, I jokingly suggested that 'next year', it would be cool to work them from the boat on 630m.

Although there was no immediate commitment, I knew that the seed had been planted, and with three of the four crew being engineers, I suspected it might be hard for them to resist, and ... just before departure, the local bunch of 630m ops were put on alert to be watching for CF7MM/mm on 475 kHz CW as they would be attempting to work us from three different overnight anchorages during their summer voyage!

Evidently Toby had been working quietly during the winter to make this become a reality. Here are some pictures of the system along with Toby's (the system's builder) comments.

Variometer and matching transformer

I have attached photos of the CF7MM/MM 630m setup on Hakuna Matata. The lower black toolbox holds a variometer with selectable taps and a matching toroidal autotransformer with selectable taps. At the base of the antenna is another series loading coil.

Wire vertical and loading coil

The antenna wire is 14 ga 38 ft long with plastic Unadilla "END-sulators" at each end. Ground was the boats's cast steel keel and a couple of 30 ft wires near the gunnels. The rig is an IC-746 with my power-mixer transverter. Transmit power was about 20W TPO.

Toby (VE7CNF) working the pileups!

Tuning and matching was done with a resistive voltage divider setup, signal generator, and portable oscilloscope. Once the matching was figured out, I could re-tune the variometer to give a dip on the transverter's RF voltmeter and check that we had the same RF voltage as with a dummy load connected.

Tuneup

The antenna equivalent circuit is approximately 100 pF in series with 27 ohms. Coil losses were 23 ohms for about 50 ohms total load resistance, so the matching autotransformer was not used. The base loading coil is approximately 170 uH and the variometer is 950 uH, for 1120 uH total inductance.

The route, heading north from Vancouver

We tried disconnecting the gunnel ground wires and leaving only the keel, and found that the antenna capacitance and resistance did not change. When we disconnected the keel and left only the gunnel wires, the antenna capacitance dropped to about 87pF and antenna resistance dropped by a few ohms. It appears that the keel provided most of our ground coupling to sea water and it would have been a sufficient ground on its own.

More details of Toby's 630m transverter as well as a practical 630m antenna tune-up procedure can be found on his website here.

All-in-all, I think the 630m operation was a great success and very likely the first-ever 630m marine mobile operation on that band, as I don't recall this happening anywhere else over the years. It was also a great way to pay homage to the band's original maritime heritage where its quality groundwave and skywave capabilities were used to advantage for so many decades safeguarding mariners worldwide.



Maritime mobile operation on the amateur bands has some great history behind it, including the yacht YASME. In the mid-50's, Danny Weil was the first ever amateur to undertake DX'pedition style operations via sailboat, as he visited numerous rare islands in the Caribbean and South Pacific.

Danny on the YASME - courtesy: www.gm3itn.co.uk

Original YASME QSL -  courtesy: http://hamgallery.com/

His exploits were regularly published in CQ magazine at the time and always made for exciting reading as Danny would eventually wreck three YASMES over the years! His adventures laid the groundwork for future island-hopping DX operations such as those undertaken by Gus Browning (W4BPD), Don Miller (W9WNV) and all that followed ... I'm sure they would all have enjoyed working the HAKUNA MATATA as well!

courtesy: VK3BVW

Every once in awhile I get the yen to tune through the international SW broadcast bands as my interest in good old, basic SWL'ing, is rekindled.

These bands are certainly quieter compared to when I first discovered the magic of radio and started DXing at age eleven using a lovely old all band cathedral-style GE set up in my attic-high radio shack ... no longer just a boring attic bedroom, but one with walls plastered with QSLs from all over the world.




It was an amazing experience and one that obviously has left a lasting impression. There were hundreds and hundreds of stations on SW, throughout all of the HF bands but the highest I could tune was 19mc. on the old General Electric beauty ... who knows what was missed up higher as this was the peak of Cycle 19 and HF was on fire!

As the huge decline in international SW broadcasting over the past few years continues, I'm always pleasantly surprised to see that there are still a lot of nice DX targets to hunt for.

I was particularly excited to read Rob's (VK3BVW) just released blogspot, describing his fall listening project from down-under. Being the DX season down in Australia, Rob decided to do daily bandscans of the low HF international SW bands (4.8 - 10MHz) to see what popped-up from day to day, which was actually afternoon to afternoon, since his listening was done between noon and 4PM local time. The project may be viewed here along with a nice introductory video ... in all, a huge effort by Rob with a lot of helpful details to go along with the logs.

While there be sure to visit the rest of Rob's SW blog ... there's a lot of good stuff here to get your SWL juices flowing!

His survey results are very encouraging for those of us that may have thought that there is just not much to be heard when it comes to international SW broadcasting. As Rob points out, even though these logs reflect what was heard in Australia, most, if not all should be hearable in North America as well, even more so as we approach the DX season in North America.

So pull up your chair sometime after dark, grab a cup of your favorite beverage, and take a relaxing tune through the SW bands with Rob's list in hand ... see what you can find, and perhaps rekindle that early fascination in SW radio outside of the ham bands that may have hooked you many years ago. You may also find this broadcast frequency database helpful should you run across something unknown.

courtesy: VK3BVW

Every once in awhile I get the yen to tune through the international SW broadcast bands as my interest in good old, basic SWL'ing, is rekindled.

These bands are certainly quieter compared to when I first discovered the magic of radio and started DXing at age eleven using a lovely old all band cathedral-style GE set up in my attic-high radio shack ... no longer just a boring attic bedroom, but one with walls plastered with QSLs from all over the world.




It was an amazing experience and one that obviously has left a lasting impression. There were hundreds and hundreds of stations on SW, throughout all of the HF bands but the highest I could tune was 19mc. on the old General Electric beauty ... who knows what was missed up higher as this was the peak of Cycle 19 and HF was on fire!

As the huge decline in international SW broadcasting over the past few years continues, I'm always pleasantly surprised to see that there are still a lot of nice DX targets to hunt for.

I was particularly excited to read Rob's (VK3BVW) just released blogspot, describing his fall listening project from down-under. Being the DX season down in Australia, Rob decided to do daily bandscans of the low HF international SW bands (4.8 - 10MHz) to see what popped-up from day to day, which was actually afternoon to afternoon, since his listening was done between noon and 4PM local time. The project may be viewed here along with a nice introductory video ... in all, a huge effort by Rob with a lot of helpful details to go along with the logs.

While there be sure to visit the rest of Rob's SW blog ... there's a lot of good stuff here to get your SWL juices flowing!

His survey results are very encouraging for those of us that may have thought that there is just not much to be heard when it comes to international SW broadcasting. As Rob points out, even though these logs reflect what was heard in Australia, most, if not all should be hearable in North America as well, even more so as we approach the DX season in North America.

So pull up your chair sometime after dark, grab a cup of your favorite beverage, and take a relaxing tune through the SW bands with Rob's list in hand ... see what you can find, and perhaps rekindle that early fascination in SW radio outside of the ham bands that may have hooked you many years ago. You may also find this broadcast frequency database helpful should you run across something unknown.

Maritime Traffic - courtesy: www.marinetraffic.com/

When the HF maritime CW bands were shut down in the late 90's, one of my favorite pastimes also ended ... listening for and logging the various coastal stations as well as listening for the ships themselves.

Until very recently, I had believed that there were no longer any HF maritime operations left, other than various Coast Guard weather announcements and an emergency watch on certain USB frequencies.

Over the past week I have discovered that HF maritime activity is still alive and well, through the worldwide Digital Selective Calling (DSC) system, which has been around in one form or another since the early 90's as part of the Global Maritime Distress and Safety System (GMDSS) ... I guess I was just asleep at the switch, having not been aware of the HF DSC activity!

Although it's not CW, there's still ample opportunity to hear and follow global shipping traffic as vessels of all types contact coastal land stations or call each other. One requirement that keeps the DSC frequencies busy is the requirement for vessels to test their systems at least once per week, providing many opportunities to log various coastal stations or add a new ship to your logbook. Ships can be heard calling coastals for a routine signal test, setting up an SSB phone QSO on a specified frequency or just calling another ship for a test or a phone sked. As well, DSC can be used to send a distress message alert in times of emergency.

Messages are sent in an error-correcting FSK mode, similar to the Navtex system, using the same speed and shift of 100 baud /170Hz. There are a few programs that can be used to decode the DSC messages but one of the best and most popular is the freely available "YADD", by Dirk Claessens .

YADD stands for "Yet Another DSC Decoder" and is an offshoot of Dirk's equally popular and effective "YAND", a free Navtex decoder.

YADD and several other software decoders can be downloaded from the NDB List Info site ... the best source of hands-on information for topics involving NDBs, Navtex, DGPS, DSC DXing and more.

After downloading and installing YADD and setting audio levels correctly, YADD began decoding signals with ease.


The spectrum display at the top of YADD's screen shows the audio passband coming from the receiver. With the receiver in the CW mode, DSC signals will appear on the frequency that your receiver's BFO offset frequency is set for. I prefer an offset of 400Hz so the spectrum display shows the signal at 400Hz, with the tuning cursor centered on a signal. A narrow CW filter should also be selected but no narrower than 170Hz.

Each vessel using the system, as well as the coastal land stations, have a unique 9-digit MMSI number (Maritime Mobile Service Identity). Once the software detects the MMSI numbers being used, it can then display the vessel's name (or the coastal's location and distance) so you know who you are listening to ... it's all very slick!

After initially running my receiver for a few minutes on the 12MHz DSC channel, I decided to look up the location of the first two ships I had heard, using one of the Internet's marine traffic sites.

I was surprised to find that my first catch was a large tanker under way in Kola Bay, having just departed Murmansk, in the Russian Arctic. Vessel number two was also under way along the east coast of South Korea.

The YADD screen above is showing the large bulk carrier 'SALANDI' (3FEB9) calling Rio de Janeiro Radio (PWZ) today on 16804.5KHz.

Courtesy: Henk Guddee

 A quick position check shows the SALANDI at anchor awaiting docking in Santos, southwest of Rio.



I soon discovered an active group of DSC DXers in Yahoo Group's DSC List, which I quickly joined and started asking a lot of questions. The 'Files' section also contains the latest list of ship MMSI numbers so that your YADD look-up text file can be kept up-to-date.

One of the group members, GM4SLV, has set up a wonderful website called YaDDNet devoted to collecting and posting listener's decoded loggings in realtime. One of YADD's features is the ability to automatically upload decoded signals, similar to PSK Reporter. It's an easy 30-second job to configure YADD to upload your spots to the net. His site also contains the latest MMSI look-up file used by YADD which is updated in real time from the latest log postings ... presently at 34,566 vessels!

Clicking on any of the uploaded ship names displayed in the real time YaDDNet log, automatically takes you to an online vessel-tracking site which usually has a picture of the ship along with all of its information, including its present position.

If you set up YADD to do some listening, I'd strongly urge you to also set it up so that your decoded spots are uploaded to the YaDDNet page in real time. Configuring this capability is very simple. Your latest logs will also keep the MMSI database up-to-date for all YADD users.

If, like me, you have missed the maritime CW activity on HF, you may find monitoring DSC traffic of interest ... both ships and coastals. I may even try QSLing some of the coastals again, many of which will still issue a traditional card QSL, upholding a long standing shortwave radio tradition ... but grab them while you can!

From my collection. Heard 4349KHz CW Aug '96

Maritime Traffic - courtesy: www.marinetraffic.com/

When the HF maritime CW bands were shut down in the late 90's, one of my favorite pastimes also ended ... listening for and logging the various coastal stations as well as listening for the ships themselves.

Until very recently, I had believed that there were no longer any HF maritime operations left, other than various Coast Guard weather announcements and an emergency watch on certain USB frequencies.

Over the past week I have discovered that HF maritime activity is still alive and well, through the worldwide Digital Selective Calling (DSC) system, which has been around in one form or another since the early 90's as part of the Global Maritime Distress and Safety System (GMDSS) ... I guess I was just asleep at the switch, having not been aware of the HF DSC activity!

Although it's not CW, there's still ample opportunity to hear and follow global shipping traffic as vessels of all types contact coastal land stations or call each other. One requirement that keeps the DSC frequencies busy is the requirement for vessels to test their systems at least once per week, providing many opportunities to log various coastal stations or add a new ship to your logbook. Ships can be heard calling coastals for a routine signal test, setting up an SSB phone QSO on a specified frequency or just calling another ship for a test or a phone sked. As well, DSC can be used to send a distress message alert in times of emergency.

Messages are sent in an error-correcting FSK mode, similar to the Navtex system, using the same speed and shift of 100 baud /170Hz. There are a few programs that can be used to decode the DSC messages but one of the best and most popular is the freely available "YADD", by Dirk Claessens .

YADD stands for "Yet Another DSC Decoder" and is an offshoot of Dirk's equally popular and effective "YAND", a free Navtex decoder.

YADD and several other software decoders can be downloaded from the NDB List Info site ... the best source of hands-on information for topics involving NDBs, Navtex, DGPS, DSC DXing and more.

After downloading and installing YADD and setting audio levels correctly, YADD began decoding signals with ease.


The spectrum display at the top of YADD's screen shows the audio passband coming from the receiver. With the receiver in the CW mode, DSC signals will appear on the frequency that your receiver's BFO offset frequency is set for. I prefer an offset of 400Hz so the spectrum display shows the signal at 400Hz, with the tuning cursor centered on a signal. A narrow CW filter should also be selected but no narrower than 170Hz.

Each vessel using the system, as well as the coastal land stations, have a unique 9-digit MMSI number (Maritime Mobile Service Identity). Once the software detects the MMSI numbers being used, it can then display the vessel's name (or the coastal's location and distance) so you know who you are listening to ... it's all very slick!

After initially running my receiver for a few minutes on the 12MHz DSC channel, I decided to look up the location of the first two ships I had heard, using one of the Internet's marine traffic sites.

I was surprised to find that my first catch was a large tanker under way in Kola Bay, having just departed Murmansk, in the Russian Arctic. Vessel number two was also under way along the east coast of South Korea.

The YADD screen above is showing the large bulk carrier 'SALANDI' (3FEB9) calling Rio de Janeiro Radio (PWZ) today on 16804.5KHz.

Courtesy: Henk Guddee

 A quick position check shows the SALANDI at anchor awaiting docking in Santos, southwest of Rio.



I soon discovered an active group of DSC DXers in Yahoo Group's DSC List, which I quickly joined and started asking a lot of questions. The 'Files' section also contains the latest list of ship MMSI numbers so that your YADD look-up text file can be kept up-to-date.

One of the group members, GM4SLV, has set up a wonderful website called YaDDNet devoted to collecting and posting listener's decoded loggings in realtime. One of YADD's features is the ability to automatically upload decoded signals, similar to PSK Reporter. It's an easy 30-second job to configure YADD to upload your spots to the net. His site also contains the latest MMSI look-up file used by YADD which is updated in real time from the latest log postings ... presently at 34,566 vessels!

Clicking on any of the uploaded ship names displayed in the real time YaDDNet log, automatically takes you to an online vessel-tracking site which usually has a picture of the ship along with all of its information, including its present position.

If you set up YADD to do some listening, I'd strongly urge you to also set it up so that your decoded spots are uploaded to the YaDDNet page in real time. Configuring this capability is very simple. Your latest logs will also keep the MMSI database up-to-date for all YADD users.

If, like me, you have missed the maritime CW activity on HF, you may find monitoring DSC traffic of interest ... both ships and coastals. I may even try QSLing some of the coastals again, many of which will still issue a traditional card QSL, upholding a long standing shortwave radio tradition ... but grab them while you can!

From my collection. Heard 4349KHz CW Aug '96