Posts Tagged ‘MF’
Hunting For NDBs In CLE249
YUT - 335 kHz (courtesy: VE3GOP) |
It's CLE time once again! This coming weekend the CLE hunting grounds will be 335.0 - 349.9 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.
If you've been meaning to participate in CLE, then maybe this weekend is a fine time to try! Lately, we've had a lot of first time submissions so you won't be alone!
As well, if you're trying to learn CW, copying NDBs is perfect practice as the identifier speed is generally slow and the letters are repeated again every few seconds!
A nice challenge in this one is to hear YUT - 335 kHz. 'YUT' is located at Repulse Bay, Nunavut, way up on Baffin Island.
'YUT' runs just 25W into a massive vertical and is well-heard throughout North America and parts of northern Europe. Listen for its upper-sideband CW identifier repeated every 10 seconds (with your receiver in the CW mode) on 335.406 kHz.
At this time of the season, summer lightning storms should be drawing down significantly and with some decent propagation there will be many stations to be logged.
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.
From CLE organizer Brian Keyte, G3SIA, comes the details:
Hello all
Our 249th Co-ordinated Listening Event is less than a week away.
Just a normal CLE using a busy range of frequencies.
First-timers' CLE logs will also be very welcome, as always.
Days: Friday 25 October - Monday 28 October
Times: Start and end at midday, your LOCAL time
Range: 335.0 - 349.9 kHz
Please join us wherever you are - just log the NDBs you can identify
having their nominal frequencies in the range (it includes 335 kHz
but not 350 kHz) and any UNIDs that you come across there too.
We last concentrated on these frequencies in CLE233 (June 2018).
Please read the 'Final Details' which will follow on Wednesday.
73 Brian
(Reminder: You could use any one remote receiver for your loggings,
stating its location and owner - with their permission if required.
A remote listener may NOT also use another receiver, whether local
or remote, to obtain further loggings for the same CLE).
These listening events serve several purposes. They:
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!
- 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
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!
My 10’ x 20’ Active Loop
courtesy: americanradiohistory.com |
After recently installing a new coax run out to the loop and after five years of summer sunlight, the plastic food-storage container used to house the loop’s preamp (Wellbrook ALA100LN ... LF-30MHz) finally bit the dust ... literally.
Last week I replaced the housing with a slightly larger plastic box but I’ll still be faced with the UV bombardment and eventual deterioration of the clear plastic and lid unless I do something different.
I’ve a couple of thoughts but am hoping for some other suggestions from blog readers.
I have thought about spray painting the container, which may (or may not) prevent UV damage, but wonder if paint will stick to the smooth plastic surface? Maybe if scuffed-up a bit it would stick ... if so, the coating could be annually renewed.
Another idea is to cover it with duct tape ... not pretty, but possibly doing the job. Any other thoughts out there?
Part 2 and Part 3 of this blog were originally published when the loop was first built (2014) and describe the antenna details as well as showing the loop in action ... listening on the NDB and broadcast band as well as showing its nulling capability. It’s been a great performer and I can highly recommend the ALA100LN for a large aperture receiving loop. I’m looking forward to what will hopefully be a good winter of exciting loop DXing.
Part 2 - New LF / MF Loop
Some may recall my blog back in July (Wellbrook Loop Plans) describing a new loop that I had been thinking about as a possible replacement for my 10' shielded loop. I had been doodling various construction ideas using PVC tubing in an effort to keep it as light as possible, without introducing any metal near the loop. On Monday of this week, I dismantled the 10' loop in preparation for my new experimental rectangular loop.
I've had the Wellbrook loop preamp here for a few months, so it was now or never, while the weather was still 'antenna-friendly'. Now I do understand that this goes against one of ham radio's long-standing traditions that dictates all antenna work must wait until the weather can't get any worse. Antennas built in the winter rain always work much better than ones put up in the summer. Hopefully it's not Wouff-Hong or Rettysnitch punishable but the fall DX season is almost upon us and I'm not waiting for the rain!
The new 'loop' is not really loop-shaped but is rectangular (10' x 20') and more like a Flag antenna shape. I considered a Flag but really don't need any back-end nulling capability since I'm mainly interested in listening to the east and to the north.
The main boom section is composed of two sections of 1" PVC thick-wall (Schedule 40) pipe joined at the center and reinforced with a 10' section of 2" x 2" Douglas Fir. In addition, the boom has a truss of 1/4" Dacron to take out any end-loading sag. The vertical end sections are 3/4" Schedule 40 PVC pipe, fastened with a T at the boom end. The center mast is made of 2" Schedule 40 ABS pipe with a long section of 1 1/2" ABS nested inside that telescopes upward to anchor the truss ropes and give some additional rigidity to the mast.
Main boom and mast construction |
Looping E/W |
Although the preamp is completely sealed and weatherproofed, I still decided to mount it inside a container. The container also provided a convenient anchor to terminate the loop end wires (PVC-coated #18 stranded) without putting any tension on the soldered terminals.
Although I have not had much time to listen, and conditions are still in 'recovery' mode from earlier disturbances, initial indications are that everything is performing as well, if not better, than expected. It certainly outperforms my 10' active shielded loop by a large margin. I have yet to do any serious S/N comparisons between it and my primary LF receive antenna, a large inverted L, which must be tuned to resonance for the desired listening range. I believe that the very quiet loop / Wellbrook combination will provide an overall S/N improvement.
I have always believed that smaller loops provide deeper and sharper front-to-side nulls so I was pleasantly surprised to measure (using Perseus) null depths from 25-30db, on various groundwave signals ... more than expected. Skywave signals also deliver sharp deep nulls in the order of 22 - 25db ... again surprising, but I'll take them!
A brief listen while pointing S-E last evening turned up good signals from 1 kW'ers KYHN (1650kHz) in Fort Smith, Arkansas and KKGM (1630kHz) in Fort Worth, Texas. An early morning listen revealed good audio from JOIK (567kHz) Sapporo, Japan and JOAK (595kHz) in Shobu. Down in the ndb band, little 25-watter 'IP' on 210kHz was an all-time new catch from Mobile, Arizona.
There is still much to learn from this new antenna system but the biggest challenge will be keeping it up all winter. I did lose one of my 10' loops after several years, due to wind, when the main (un-reinforced) PVC mast eventually failed from flexing fatigue. I will tie the ends of the new antenna down when the winds get strong to reduce as much mast flexing as possible. I could however, run the risk of violating another long-standing radio adage ..."if your antenna stays up all winter, it's not big enough". I just can't win.
Part 3 - Loop Listen
As Murphy would have it, and in spite of the low amount of solar activity, LF/MF propagation has been very poor since getting my new 10' x 20' loop in place. The few front-to-side nulling checks that I have done, have produced results varying from around 20db to 30db, depending upon the signal. I suspect the depth of null is also affected by the signal's arrival angle but there is still more to learn. The pattern seems to be very close to that of a typical circular loop...the classic figure-8 pattern illustrated below as shown on the Wellbrook data that came with my ALA100LN preamp.
Courtesy: http://www.wellbrook.uk.com |
More typically, the null is around 21-22 db as shown on this test while listening to the ground wave carrier of the 'YZA' NDB (236kHz) located in Ashcroft, B.C., about 150 miles to the NE. As expected, the null is fairly sharp and the front / rear lobe, fairly broad.
One short check at dusk produced nice signals from CJBC, the French-language station in Toronto. The past few nights it has been very strong but with a strong echo effect. I wonder if there is more than one CBC outlet here (860kHz), such as a low-power repeater, causing the echo.
At the same time, while still fairly light outside, WCCO in Minneapolis had a nice signal just before sunset.
No matter how poor conditions become, it seems that the Hinchinbrook (Alaska) NDB, 'ALJ' (233kHz), is always strong ... looping north.
Courtesy: https://www.google.ca/maps |
(Since originally posting the above, I have been using the Tiny Take free screen capturing software, to produce better quality catures of my Perseus recordings. It's also probable that my new iPhone would produce a high quality video of my computer screen compared to the older iPad used for these ones, but it's something yet to be tried.)
Hopefully conditions will only get better as the season progresses and I am able to give the loop a good workout ... before it gets too windy!
Hunting For NDBs In CLE246
ZSJ - 258 kHz Sandy Lake, ON : source |
This coming weekend will see another monthly CLE challenge. This time the hunting grounds will be split: 240.0 - 259.9 kHz and 420.0 - 439.9 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.
If you've been meaning to participate in CLE, then maybe this weekend is a fine time to try! Lately, we've had a lot of first time submissions so you won't be alone!
As well, if you're trying to learn CW, copying NDBs is perfect practice as the identifier speed is generally slow and the letters are repeated again every few seconds!
A nice challenge in this one is to hear ZSJ - 258 kHz. 'ZSJ' is located at Sandy Lake, in northwest Ontario.
'ZSJ' runs 500W into a 150' vertical and is well-heard throughout North America. It has been reported in Hawaii and in Europe. Listen for its upper-sideband CW identifier (with your receiver in the CW mode) on 258.404 kHz.
At this time of the season, summer lightning storms may provide additional listening challenges but maybe we will get lucky. Propagation can often be as good as mid-winter if the lightning cooperates.
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.
From CLE organizer Brian Keyte, G3SIA, comes the details:
Hello all,
These are the final details for our 246th co-ordinated listening event
this weekend. We'll be listening in two contrasting frequency ranges.
First timer logs too? Yes, please!
Days: Friday 26 July to Monday 29 July
Times: Start and end at midday, your LOCAL TIME
Range: 240.0 - 259.9 kHz plus 420.0 - 439.9 kHz
(BOTH ranges are for ALL listeners)
Please log NDBs that you can positively identify in the ranges, plus
any UNIDs that you come across there.
The lower frequency range will be really hard for most listeners in
Europe, the higher range not at all easy for most others.
Send your final CLE log to [email protected] if possible as a plain text
email and not in an attachment.
Show CLE246 and FINAL at the start of its title to help us find your log.
Show on EVERY LINE of your log:
# The Date (e.g. 2019-07-26, etc.) or day (e.g. 26)
# UTC (the day changes at 00:00 UTC).
# kHz - the beacon's nominal published frequency (if you know it).
# The Call Ident.
Please show those main items first on each line, BEFORE any optional
details (Location, Offsets, Cycle time, Distance, etc.)
If you send interim logs, do make sure that you also send a 'FINAL' log
containing all your loggings. As always, do make your log useful and
interesting to everyone by including your own location and brief details
of the receiver, aerial(s) and any recording equipment that you used.
We will send the usual 'Any More Logs?' email at about 19:00 UTC on
Tuesday so that you can check that your Final log has been found OK.
Do make sure that your log has arrived on the List at the very latest
by 08:00 UTC on Wednesday 31 July. Joachim and I hope to complete
making the combined results within a day or two.
To help you with your search you can find lists and maps showing the
target NDBs for your part of the World at http://www.ndblist.info/cle.htm
Select the CLE SEEKLIST link there.
Good listening
Brian
--------------------------------------------------------------------
From: Brian Keyte G3SIA ndbcle'at'gmail.com
Location: Surrey, SE England (CLE coordinator)
--------------------------------------------------------------------
(Reminder: You could use any one remote receiver for your loggings,
stating its location and owner - with their permission if required.
A remote listener may NOT also use another receiver, whether local
or remote, to obtain further loggings for the same CLE).
These listening events serve several purposes. They:
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!
- 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
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!
A Long Listen On 1240 KHz
Ionosphere: source |
One of the Broadcast Band’s (BCB) six ‘graveyard’ frequencies is 1240 KHz.
These frequencies (1230, 1240, 1340, 1400, 1450 and 1490 KHz) are assigned to smaller stations running non-directional antennas and up to 1000 watts of power. In North America, there are typically about 150 stations assigned to each frequency.
The origin of this spooky name is often a source of debate. Some suggest that it comes from the cacophony of strange howls and sounds that can be heard on these frequencies at night, as multiple fading signals fight it out to be heard, while others relate it to the similarity of the jam-packed headstones in a typical graveyard. Whatever the true reason, it's a fascinating part of the BCB to explore.
Most BCB DXers enjoy the challenge of tackling the graveyard frequencies as they're often so busy. New stations will fade in for a brief period only to be replaced by a totally different one a few moments later ... and then a different one soon after. It gets even better if the fade-ups coincide with a local ad or a ‘top-of-hour’ ID, putting a new catch in the log!
Several days ago I reactivated my 10’ x 20’ loop and Wellbrook ALA100N preamp, that I use for NDB and BCB DXing, by adding a new buried coax line from the shack.
I had previously re-appropriated the loop’s coax for a nearby HF wire antenna and had been without the loop all winter.
After BCB DXer Mike Cherry (VE7SKA) on Salt Spring Island, the next island to the west of me, described some of the European action that he had experienced last winter, I am determined to not miss out during the next winter's BCB DX season!
10' x 20' Loop & Wellbrook ALA100N Preamp |
Once getting the loop powered-up in mid-afternoon, I decided to give it a test by making a ‘deep-search’ on 1240 KHz.
At 1500 hours local time, I wasn’t hearing any audio on 1240 but a weak carrier could be detected audibly. Using my Perseus SDR’s waterfall in its narrowest possible window, produces an extremely narrow passband, effectively increasing the sensitivity by a huge factor. This allows the waterfall to display weak signals that are presently being propagated to my location but far too weak to be heard by ear. I’m estimating that in this narrow bandwidth, it can dig about 30 dB or more into the noise, but there is a price to be paid for this extra gain .... time!
If you're used to watching your receiver’s waterfall scroll along quickly, this mode is just the opposite. It moves in very slow increments, allowing the weaker signals to build up enough to be visible before taking the next deep look. The screen capture shown below is a result of a three-hour listening period, from 1500-1800 hours local time. The entire waterfall is 25 Hz wide, with each tick representing 1Hz.
3-Hour Daylight Deep Search |
Although no signals were clearly audible during this period, my deep-search revealed the carriers of ~28 different stations being received here in south-west British Columbia ... in the middle of a summer afternoon! It’s interesting to note that few of these signals are 100% stable and several can be seen really struggling to maintain their exact assigned frequency. In this highly narrow bandwidth view, even the worst drift amounts to no more than a Hertz, well within the required tolerance of +/- 20Hz.
Using the always-reliable MWLIST, the locations of the most likely candidates for these 28 signals are plotted below. These are the 28 nearest stations and with my loop pointing east, a definite east / south-east flavour is evident.
At mid afternoon, one might expect to see only groundwave-propagated signals on the broadcast band. Midday groundwave on the broadcast band can easily travel a few hundred kilometers, gradually growing weaker over the longer paths. Perhaps all of these signals are arriving via this mode as they are at least 20-30dB into the noise. I initially thought that some of the further-out signals were being reflected from a strong daytime D-layer, although most of the energy would be absorbed. Further reading shows detectable groundwave up to 1200km is possible which coincides nicely with the distances observed. Most likely what I'm seeing is a combination of extended groundwave and D-layer refraction on the furthest signals.
The second screen capture shows the same frequency for another three hours, starting about an hour before local sunset. Some of the weaker signals seen earlier now begin to grow in strength as the D-later absorption starts to decay and reveal the higher E-layer. By the end of the third hour, an additional 41 stations have appeared for a total of 69 carriers cantered on 1240 KHz. (note that my Perseus calibration is off by a few Hz)
3-Hour Sunset Deep Search |
The next 41 closest stations are now plotted below in yellow, showing the most likely source of these signals. The distances illustrated are in-line with single and double-hop E-layer or possibly lower F-layer refraction.
This view shows the directional pattern of the front of the loop while pointing east, with its very broad circular lobe. In this direction, the narrow null is only seen along the coast.
It will be interesting to do a mid-winter follow-up on 1240 and compare the present summer propagation to the much better winter conditions. I expect that a some point, propagation via the higher F-layer will be present and extend skip distances out to the east coast or to South America.
In the meantime, things are almost ready for some pre-sunrise looks to the west and some overnight top-of-hour recordings ... as soon as I re-calibrate Perseus!
An Old Friend Returns + A Heads-Up For CLE243!
Over the years, one of the ‘most heard’ NDB signals from Alaska was the decades-old beacon located near the western tip of the Aleutian Islands at Adak.
'ADK' had been around in one form or another since WWII but it suddenly vanished from the air in 2012. Like numerous other NDBs in Alaska, as well as in the lower 48 and Canada, once officially NOTAM’d (Notice To Airmen) as shut down for ‘maintenance’, they often never return.
Such was the case assumed by all NDB DXers with regard to ADK, especially following the cryptic 2015 NOTAM announcing a permanent closure. It was hard to believe that this early-morning regular was now gone for good.
Transmitting on the lower edge of the AM broadcast band (530kHz), ADK was often stumbled upon by wayward BCB DXers or sought-out as a good propagation indicator for the pre-sunrise Asia-North America path on the BCB. I’m sure that some even heard it on their analog car radios back in the day when many of them would tune down as low as 520kHz!
All that changed this weekend when Dan, VE7DES, a regular weekend-contributor to the RNA database, found ADK had risen from the dead after all these years and was putting a nice signal into the southern west coast of Canada!
It seems that ADK’s antenna had been blown down in the summer of 2012 which explains its sudden demise. An FCC employee in Alaska has indicated to me that in recent months there had been much interest in reviving ADK which would apparently allow more airlines access to the field than had previously been the case ... whatever the reason, NDB DXers are delighted to hear their long-lost friend once again!
Hopefully it stays around for many more years yet, but just in case, why not give a pre-dawn listen for its CW identifier on 531.034kHz, with your receiver in the CW mode. Long haul propagation can often be excellent in this part of the spectrum in the early morning and ADK has been logged from Hawaii to Illinois.
Here’s how ADK's 25 watts sounded here this morning at around 0530 local time.
Heads up for CLE243 this coming weekend ... final details coming mid-week:
For our 243rd Co-ordinated Listening Event, coming in a few days, we can expect a bit of a challenge.
Days: Friday 26 April - Monday 29 April
Times: Start and end at midday, your LOCAL time
Range: 270.0 - 319.9 kHz
Yes, it does include most of the DGPS beacons - and 50 kHz wide is about three times more than usual, but we shall only be listening for the 'NORMAL' NDBs.
We last searched for NDBs on these frequencies in February 2018 when a record 59 of us took part in CLE229.
We shall all have at least one end of the range for some easy listening, but the main challenge will be to find the Morse signals among those DGPS noises.
REU and RNA show that, in the last 18 months, about 310 and 200 normal NDBs have been heard in this range by listeners in Europe and North America respectively.
REU and RNA show that, in the last 18 months, about 310 and 200 normal NDBs have been heard in this range by listeners in Europe and North America respectively.
There are also several to be heard by members away from Europe and North America, as you can see in the map from RWW, below.
Please look out for the 'Final Details', which as usual will follow about two days before the start.
Happy Easter!
73
Brian
-----------------------------------------------------------------
From: Brian Keyte G3SIA ndbcle'at'gmail.com
Hunting For NDBs In CLE241
ZWW - 215 courtesy: VE3GOP |
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.
Never tried the CLE? If you've ever been wondering what can be heard 'below' the broadcast band, this weekend would be a great time to give a listen and enter your first CLE!
A nice challenge in this one is to hear 'ZWW' on 215 kHz located near Winnipeg, Manitoba. It's a 25-watter and is well-heard throughout North America. Listen for its CW identifier on 215.388 kHz (repeated every 10 seconds), with your receiver in the CW mode .
MF propagation this week has been good and signals in this frequency range should be propagating well if things stay undisturbed for the weekend.
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.
From CLE organizer Brian Keyte, G3SIA, come details via the The NDB List Group:
Hello all,
Our 241st Co-ordinated Listening Event is next weekend.
Do join in if you can. First-time CLE logs will also be very welcome.
Days: Fri. 22 Feb. - Mon. 25 Feb., Midday-Midday, your local time
Frequencies: NDBs from 190 - 239.9 kHz
PLUS: Normal NDBs with carriers on 'half-way' frequencies ‘nnn.5 kHz’
(from 190.5 - 999.5 kHz)
Both halves are for everyone to try.
Away from Europe many of the frequencies below 240 kHz are busy with
NDBs. In Europe there are very few, but some DX ones might be heard
from North America and maybe from a few other places.
The normal NDBs which have carriers on the 'half-way' frequencies
e.g. 267.5 OPW, 333.5 VOG, 370.5 LB, 390.5 ITR, 433.5 HEN (not DGPS)
are scattered across Europe but there are very few of them elsewhere.
'Hot spots' are ENG and ITA.
These half-frequencies usually give comfortable QRM-free listening
and probably some good catches as a result.
America has only one or two (e.g. 381.5 SJX in MI) but East and West
coasters might hear some DX ones.
We last used these 'rules' for CLE225 in November 2017.
Please look out for the Final Details about two days before the CLE.
73
Brian
----------------------------------------------------------------------------
From: Brian Keyte G3SIA ndbcle'at'gmail.com
Location: Surrey, SE England CLE Coordinator)
----------------------------------------------------------------------------
These listening events serve several purposes. They:
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!
- 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
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!
CLE240 Results
courtesy: NOAA |
Last weekend’s CLE240 saw mediocre propagation for North America and European listeners alike.
It seems that our monthly CLE schedule continues to be synced with the Sun’s monthly rotational period that has been regularly lining us up with the same massive coronal hole, elevating earth-directed solar wind speeds now for several months.
Several CLE participants in the USA commented on the lack of any propagation into BC, further fueling my long-held belief that BC seems particularly sensitive to any geomagnetic activity in the auroral zone to our north. The auroral activity always seems to dip further to the south here for some anomalous reason, as listeners just a few hundred miles to the south or southeast see far less absorption than is observed here.
With a few exceptions, the main effect of these conditions is to largely kill the normal east-west propagation path and just allow single-hop signals from the south or the SE/NW to dominate. Typically, the path to the Pacific is not affected and can often be enhanced.
As a side observation, this past weekend was also the CQWW 160m DX contest and, as one left-coaster commented, conditions were the “worst seen in 10 years”. One would expect to see much better conditions and a much quieter Sun at this point in the solar cycle!
With fingers crossed for better propagation during the next CLE, here is what was logged over the three-night listening event from my location here in BC’s Southern Gulf Islands using a Perseus SDR and an Inverted-L antenna resonated to 400 kHz:
26 05:00 385 QV Yorkton, SK, CAN
26 07:00 385 OCC Yakutat, ALS
26 09:00 385 MR Pacific Grove, CA, USA
26 09:00 385 EHM Cape Newenham, ALS
27 07:00 385 CPZ Chaparrosa Ranch, TX, USA
26 07:00 386 SYF St. Francis, KS, USA
26 09:00 386 HAU Helena, MT, USA
26 06:00 388 OK Preston, OK, USA
26 07:00 388 MM Fort Mc Murray, AB, CAN
26 07:00 388 JW Pigeon, AB, CAN
26 06:00 388 CDX Somerset, KY, USA
26 06:00 389 YWB Kelowna, BC, CAN
26 04:00 389 TW Twin Falls, ID, USA
26 07:00 389 CSB Cambridge, NE, USA
26 07:00 390 HBT Sand Point, ALS
26 11:00 390 AES Northway, ALS
26 04:00 391 TK Telkwa, BC, CAN
26 11:00 391 GXD Nacogdoches, TX, USA
26 07:00 391 EEF Sisters Island, ALS
26 06:00 391 DDP Dorado, PTR
26 09:00 392 ZFN Tulita, NT, CAN
26 05:00 392 PNA Wenz, WY, USA
26 05:00 392 ML Charlevoix, QC, CAN
26 08:00 392 FMZ Fairmont, NE, USA
26 10:00 393 UKS Kosrae, FSM
26 04:00 394 RWO Kodiak, ALS
26 07:00 394 DQ Dawson Creek, BC, CAN
26 07:00 395 YL Lynn Lake, MB, CAN
26 04:00 395 ULS Ulysses, KS, USA
26 07:00 395 5V Drumheller, AB, CAN
26 07:00 396 YPH Inukjuak, QC, CAN
26 05:00 396 CRS Corsicana, TX, USA
26 05:00 396 CMJ Ketchikan, ALS
26 07:00 397 ZSS Saskatoon, SK, CAN
27 12:00 397 SB San Bernardino, CA, USA
26 10:00 398 YOD Cold Lake, AB, CAN
26 06:00 398 3D Cumberland House, SK, CAN
26 11:00 399 ZHD Dryden, ON, CAN
26 11:00 399 SRI Pribilof, ALS
A summary of results for all participants can be found here, at the ndblist info site.