Saturday 19 December 2020

Hunting NDBs In CLE 263


It's CLE time again!

'CLE's are 'Co-ordinated  Listening Events, and NDB DXers around the  world focus their listening time on one small slice of  the NDB spectrum.

This time it's VERY different and the hunting ground is everywhere! CLE 263 will require some pre-planning ... this is all explained below by Brian Keyte.

Propagation on MF has been excellent this past month and hopefully will continue to be good.

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' near 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. These databases have recently been re-vamped and are slicker than ever before!

From CLE coordinator Brian Keyte (G3SIA), comes the following CLE info:

Hello All


It is time to confirm the details of our special Holiday Listening Event for you.  


Between local midday on 25th December and local midday on 3rd January you are invited to ‘make a flight of your choice’ by logging NDBs along the way (as many pilots would have done in the old days!).

The main challenge is that you will be using your own receiver, probably from your home, for ALL your loggings.  (Or you could use one Remote receiver if you prefer that).


Your log format can look just the same as usual for normal CLEs, but, very important, you must log your chosen NDBs in the correct time sequence for your journey.  Your time between making two consecutive NDB loggings for your log could be minutes, hours - or even days!   However, you won’t be able to go back and fill in a missed NDB earlier in your flight unless you re-log the NDBs from that one.   It means that a bit of pre-planning will be very useful - and fun.

At the end of this email we have added a HELP SECTION of ‘Extras’  which include advice on how you can use the RWW database for your planning, with the help of its maps that show all of the known NDBs Worldwide.


You could choose a flight to your favourite holiday destination, or make a ‘round trip’ with interesting places along the way, or go a   L O N G  way, finishing far away, as NDB reception allows.   You could choose to start – and/or to finish – at ANY active NDB that you can log.   There is plenty of scope for you to choose something unusual and we hope that a lot of interesting and varied flights will be made.


In the Extras Section below there is also the log of an imaginary ‘flight’ using the real, active NDBs on a round trip between Rio de Janeiro and Buenos Aires in South America - and the flight map that was made from it. 

In the CLE Combined Results we hope to include all of the separate flight maps, each of them made from our CLE flight logs.  Each reporter’s map will probably sit nicely in a separate Excel Sheet of the results.  (E.g. in Europe’s results, ‘CZE my’ in extra Sheet1, ‘DEU hw’ in extra Sheet2..  .  and in Rest of the World’s results, ‘AUS SA rw’ in extra Sheet1, etc. .. )


Here are a few things to think about:


You could choose to start your flight from any NDB of your choice

- or from your local NDB.

- or from your ‘Home’ (your usual QTH) – just add the word HOME on the line immediately above your first NDB logging.  

- or from your chosen Remote receiver - just add the word REMOTE on the line immediately above your first NDB logging.  That remote receiver is your temporary ‘home’ for this CLE and ALL your loggings must be made using it.


The same NDB must NOT be logged more than once because your map would no longer be able to show your route – we would have to delete any same-NDB loggings after the first one.

However if you choose to start and end your flight at the same NDB (e.g. your nearest) that WILL be OK.

In normal CLEs we sometimes get the same log time for consecutive loggings.   If this happens in your flight log PLEASE show the first one as 1 minute earlier (or the second one 1 minute later).   If you don’t do that your flight map may go to the wrong NDB first and so have a strange zig-zag there.

PSKOV users - this applies to you too, after you have found your actual logging times (please see the Extras Section 3 below)


We don’t want to set a limit to anyone’s total count of NDBs (= loggings = flight ‘legs’).  However, please bear in mind that the further away you go and/or the more NDBs you visit, your map will quickly become complex and hard to appreciate.   Flights with a lot of zig-zagging and very long legs between loggings should also be avoided if you can.   


Our thanks to those who have contacted us since the ‘Extra Early Advice’.  There are already some good ideas and ‘themes’ for flights.  We could mention what their ideas are, but that would ‘Steal their Thunder’!


Please look out for our Final Details about the Event on about 22nd December.   It will have a little more quite important advice on log making, etc.      


Good planning!

  Brian and Joachim










You will find the amazing (Worldwide) database RWW very helpful. 


Go to


Select   New (top right)   then  Signals (left)  and  √NDB  (in the lower box).


Then select your chosen RWW Focus (Region) and, if needed, States, Countries or Grid Squares. 

Finally choose   Status: Active    and, in the bottom line,  Map                                                                


And – you’re away!






Here is our ‘dummy run’ – an inland flight from Rio de Janeiro in Brazil, via Paraguay and Uruguay, to Buenos Aires in Argentina and back along the Atlantic coast.  That would be practicable if you live in the south of Brazil or if you could find a good Remote receiver there  (It would be a near miracle for any of us listening in Europe - and maybe from North America as well!)

The flight started and ended at NDB  330 YLA in Rio.


Test Log for a CLE263 ‘Flight’:

(any of the usual log formats will be OK)



dd           UTC       kHz        Ident      Location                 Cou.  


26           2205      330        YLA        ILHA (RJ)                 BRA   

26           2236      285        BBC        Barbacena (MG)   BRA   

26           2341      325        VGH       Varginha (MG)      BRA   

27           0013      310        PSN        Piracununga(SP)   BRA   

27           0255      380        BRU       Bauru (SP)              BRA                  

28           2317      320        MRN      Maringa (PR)         BRA                  

29           0024      200        CDE        Cascavel                 BRA                  

29           0259      307        P             Posdas                    ARG                  

29           1947      275        URG       Uruguaiana            BRA                  

29           2020      260        TBO       Tacuarembo           URG                  

29           2129      280        P             PALMERO B.Aires ARG   

31           1915      239        LS           Capitan Corbeta    URG   

31           1945      312        UI           Chui (RS)                 BRA   

31           1951      290        RG          Canal                       BRA   

31           2048      300        FB           Tramandai (RS)     BRA   

31           2209      280        JGN        Jaguaruna              BRA   

31           2211      235        NVG       Naveagantes(SC)  BRA   

31           2219      320        NX          Domel (PR)            BRA   

31           2307      330        PP           Metro (SP)             BRA   

31           2323      430        TBE        Taubate (SP)          BRA    

31           2344      330        YLA        ILHA (RJ)                 BRA   


Flight Map, made from the above log:


(We may choose a different program to make the flight maps)






It seems that the rules for this CLE (log-times in sequence with NDB stop-overs, no two logs having the same minute) collide with the way the PSKOV Log Feature works.

PSKOV always automatically uses the start-time of a particular recording as the time logged for reception of the beacons on the recording. 

However, PSKOV users will know that the log-time issue can be solved by either using short recordings in Skimmer mode or, for longer recordings, finding the exact time of reception in Viewing Mode.   


The users have told us that the use of short recordings for this CLE is highly recommended.

Once a beacon has been found using Skimmer mode, it can be logged with the built-in Log Feature, then transferred by copy/paste to a CLE master log (e.g. in EXCEL or text editor) and changed to show the actual time of reception.




  If you are interested in some remote listening - maybe
  due to local difficulties - you could use any one remote
  receiver for your loggings, stating its location and with
  the owner's permission if required.
   ( e.g. see )
  A remote listener may NOT also use another receiver,
  local or remote, to make more loggings for the same CLE.

These listening events serve several purposes. They

• determine, worldwide, which beacons are actually in service and on-the-air so the newly-re-vamped Rxx 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.

The NDB List Group is a great place to learn more about the 'Art of NDB DXing' or to meet other DXers 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.

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

Remember - 'First-time' logs are always VERY welcome!

Reports may be sent to the NDB List Group or e-mailed to CLE co-ordinator, Brian Keyte (G3SIA), whose address appears above. If you are a member of the group, all final results will also be e-mailed and posted there.

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.

Have fun and good hunting!