Hunting For NDBs In CLE240

OO-391kHz - Oshawa, Ontario courtesy: VE3GOP




This coming weekend will see another monthly CLE challenge. This time the hunting grounds will be 385.0 - 399.9 kHz.

 


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 on one small slice of the NDB spectrum.

A wonderful challenge for listeners in North America is to hear little OO - 391kHz, located in Oshawa, Ontario. It puts out only 7 1/2 watts but has been logged on both coasts as well as in Europe! Listen for its USB CW identifier (with your receiver in the CW mode) on 391.396 and its LSB ID on 390.595 kHz.

MF propagation this past week has been good and signals in this frequency range should be propagating well if things stay undisturbed for the weekend. As usual however, a large coronal hole has returned to its monthly CLE position and its weekend effects are still unknown.

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 1020Hz 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.


From CLE organizer Brian Keyte, G3SIA, come details via the The NDB List Group:


Hello all,

Our 240th Coordinated Listening Event is less than a week away.
We can now forget all about pyramids and relax with a straightforward
event.   Whether you are a keen propagation watcher or just a
take-what-comes listener, please join in.

    Days:    Friday 25 January - Monday 28 January
    Times:   Start and end at midday, your LOCAL TIME
    Range:   385.0 - 399.9 kHz

Please log all the NDBs you can identify that are listed in that range
(it includes 385 kHz but not 400 kHz) plus any UNIDs you find there.
We last used this frequency range for CLE224 in October 2017.


Please send your final log to the List (no attachments and ideally
in a plain text email) with ‘FINAL CLE240’ in its title.
Show on each line:

    #   The Date (e.g.  '2019-01-26' etc.  or just '26' )
    #   The Time in UTC (the day changes at 00:00 UTC).
    #   kHz  - the nominal published frequency, if known.
    #   The Call Ident.

Please show those main items FIRST.  Other optional details such
as Location and Distance go LATER in the same line.
As always, of course, tell us your own location and brief details
of the equipment that you were using during the Event.

We will send the usual 'Any More Logs?' email at about 18:00 UTC
on Tuesday so that you can check that your log has been found OK.

The combined results should then be completed within a day or two.

You can soon find full details about current and past CLEs from the CLE page
http://www.ndblist.info/cle.htm  It includes access to CLE240 seeklists
for your part of the World, prepared from the previous loggings in Rxx.

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

  (If you would like to listen remotely  you could use any one remote
  receiver for your loggings, stating its location and owner and with their
  permission if required.  A remote listener may NOT also use another
  receiver, local or remote, to make further 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 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 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.

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!

Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

One Response to “Hunting For NDBs In CLE240”

  • Boots VK3DZ:

    Moorabbin Aerodrome NDB (Victoria, Australia) – MB – on 398 kHz is one of the few remaining Australian NDB in this frequency range.

    MB runs 100 watts 6K00A3E into a top-loaded vertical typical of many Australian NDBs. The beacon uses MCW for ident & also has ATIS (recorded voice information for the aerodrome). The aerial is essentially a 21 m vertical wire with a folded 3-wire loading structure about 70 m long over a ground system of ~ 60 x 40 m radials. See http://www.airwaysmuseum.com/NDB%20BLT%202-05.htm for the style. The transmitter hut and ACU at that url is also typical of our NDBs.

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