HFU HF Underground
Loggings => Fishing Drift Net Beacons => Topic started by: Looking-Glass on March 17, 2019, 1738 UTC
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Does any one chase/log/look for the many, mostly or assumed Asian, drift net fishing beacons on 1.7 to 2.6MHz CW which transmit usually on a four minute key off cycle?
They come into Eastern Australia very well in the hours of darkness and there are literally hundreds of them.
Scattered around the vast Pacific Ocean bobbing around sending their low powered (10-25w) call sign every four or so minutes three times I have been logging quite a few.
Does any one else share this interest and if so what do you hear and when?
Are they exclusive to the Pacific or are they also being heard in the Atlantic and Indian Ocean regions too?
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I've been chasing them for years, ~125 in the log. Mostly around daybreak here on the east coast. Only logged a few new ones this winter, work schedule keeps getting in the way. Using a TS-520SE & 40m dipole so finding them is kind of like playing "whack-a-mole". Never tried to DF any so not sure where they come from.
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Does any one chase/log/look for the many, mostly or assumed Asian, drift net fishing beacons on 1.7 to 2.6MHz CW which transmit usually on a four minute key off cycle?
They come into Eastern Australia very well in the hours of darkness and there are literally hundreds of them.
Scattered around the vast Pacific Ocean bobbing around sending their low powered (10-25w) call sign every four or so minutes three times I have been logging quite a few.
Does any one else share this interest and if so what do you hear and when?
Are they exclusive to the Pacific or are they also being heard in the Atlantic and Indian Ocean regions too?
I'm definitely interested, but so far, I've never been able to copy one of these signals. Can you recommend any frequencies and times to listen? I live in Seattle, WA and figure that I should be able to pick up something from here. :D
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Strange Beacons:
These beacons were logged here on Australian east coast the last two nights/mornings (just a sample as log actually much larger):
1.717MHz PA2 1646z 2.206MHz ZW6 1206z
1.747MHz PO5 1300z 2.226MHz CA6 1418z
1.759MHz RO3 1303z 2.265MHz AN6 1450z
1.759MHz QG3 1259z 2.265MHz BP8 1500z
1.789MHz PO9 1258z 2.281MHz BR1 1021z
2.595MHz KQ0 1452z
1.801MHz OA9 1302z 2.595MHz EM1 1550z
1.842MHz OB3 1156z 2.635MHz UL9 1508z
2.042MHz MJ0 1604z
2.059MHz DA8 1710z
2.102MHz CR2 1611z
2.122MHz DO63 1414z
2.123MHz DB37 1415z
2.151MHz CQ9 1104z
On rare occasions you can get two beacons on the same frequency as I did last night with 2.595KHz with KQ0 and EM1, the other morning I had one beacon starting within five seconds of the other keying off.
When propagation is good you can easily log up to 30 beacons or more in one sitting up and down the band between 1.710MHz and 2.700MHz, I tend to use the CW mode for reception with both the ICOM and Yaesu radio gear I run here.
Propagation can be very narrow too, sometimes they are easily heard in the 2MHz band whilst the 1.710MHz sector is a lot lighter in copy.
Best times to listen are the hours of darkness.
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I've logged drift net beacons from time to time. You can find logs of them here on the HFU by myself and others, but they could be scattered around a few of the boards.
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Strange Beacons:
(Snipped out and saved big list of frequencies)
Best times to listen are the hours of darkness.
Excellent, thank you. I don't know if the same amount of activity will be true for my area of the Pacific Northwest in Seattle, WA USA. But this will give me some idea of the frequency ranges.
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I ran across two this morning around 2110 kHz while checking for the A beacon on 2097 kHz. One was continuously transmitting, rather than the usual pattern of a few IDs and then silent for several minutes.
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Does any one chase/log/look for the many, mostly or assumed Asian, drift net fishing beacons on 1.7 to 2.6MHz CW which transmit usually on a four minute key off cycle?
They come into Eastern Australia very well in the hours of darkness and there are literally hundreds of them.
Scattered around the vast Pacific Ocean bobbing around sending their low powered (10-25w) call sign every four or so minutes three times I have been logging quite a few.
Does any one else share this interest and if so what do you hear and when?
Are they exclusive to the Pacific or are they also being heard in the Atlantic and Indian Ocean regions too?
I know they're used in the Atlantic Ocean...as mentioned, the logs could be spread across the board. Some versions of the radiobuoys/fishnet radio beacons also use the 26 to 30 MHz band instead of 1.8 to 4 MHz (I believe the allocation in ITU Region 2 is 1.6 to 4 MHz). The 26 MHz region seems to be the most popular part although in previous sunspot peaks they've been heard in the 11 meter CB band, above CB channel 40 and in various parts of 10 meters. I remember seeing a video on YouTube of a CBer in New Zealand who had come across a driftnet beacon transmitting on one of the 26 MHz New Zealand CB frequencies (26.450 MHz / 26450 kHz IIRC), probably of Asiatic origin.
I do think the majority used operate in the 1.6 to 4 MHz region and the higher-frequency ones are less common.
See also:
https://www.qsl.net/n2sln/driftnetbeacons.html (https://www.qsl.net/n2sln/driftnetbeacons.html)
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This seems very interesting. Is there a way to figure out the geographic location of the beacon based on the CW information sent from the beacon? (Rough location anyway) Also any direction towards a frequency list would be great. I'll look around the boards a little now. Thanks
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This seems very interesting. Is there a way to figure out the geographic location of the beacon based on the CW information sent from the beacon? (Rough location anyway) Also any direction towards a frequency list would be great. I'll look around the boards a little now. Thanks
https://www.rtl-sdr.com/kiwisdr-tdoa-direction-finding-now-freely-available-for-public-use/
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Checking this morning, the beacon I heard the other morning is back, IC1 on 2115, continuously transmitting the ID and a dash. A very good signal at 0956 UTC.
And of course reliable A on 2097.3, the pirate beacon.
And now JC3 on 2075 at 1005 UTC.
An HFU Wiki page on these beacons was created some time ago, it could be updated and used to keep track of which beacons folks are hearing: https://www.hfunderground.com/wiki/index.php/Fishnet_beacon
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Chris: Yes, I picked up on some other pages relating to this topic, would be nice to have a stand alone where everyone can sing from the same hymn page. Also I came across two beacons last week transmitting continuous also, maybe they are in "homing programme" so the mother ship can obtain a continual signal fix for tracking purposes?
Noted your logging of JC3 on 2.075MHz and IC1 on 2.115 around the 1000z mark, will see if I can log them here, be interesting to see if they can be heard on both sides of the Pacific.
These beacons are in the Pacific somewhere as I have heard huge 30 to 40dB over signals from ZL amateurs on 160m and east coast northern VK same and the beacon reception has been great at that time. Also I try and compare New Zealand NDB signals with the drift net beacons to try and work out a rough path.
Strange Beacons: You have to remember that these beacons are not continuous transmission and have a roughly four minute key off period before a re-transmission of the call sign three times then key off for about four minutes.
Had 1.817MHz last night with a fault, it used to transmit "4QVZ" back on 25th Feb 2019, in the first week of March it was "TMT" and last night it was "EIE" with a wobbly carrier and uneven sending. This probably suggests it has a battery fault/low battery or transmitter problem, also it had reverted to a 90 second key off.
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Yes, I picked up on some other pages relating to this topic, would be nice to have a stand alone where everyone can sing from the same hymn page.
Would you prefer a separate board for these? We already have HF beacons (originally meant to be the "pirate" beacons but ham and other beacons end up here as well) and the 22 meter beacon board. We could create one for the drift net / fishing beacons, and make all three of these sub boards of beacons category. Posts / threads can be moved, so as we find existing drift net beacon posts they can be re-located to the new board.
At 0935z I have the 2115 beacon again with a good signal, noticed while checking for A on 2097.3 kHz. Perhaps I can TDoA 2115 since it is constantly on?
Hmm, I cannot find it on any KiwiSDRs. I found another one on 2115 on a Hawaii KiwiSDR but it is sending SN5 - so another beacon. Perhaps this is from the Atlantic?
Ok, I found it on another MD KiwiSDR, also one in PA and one in VA. Too weak to use TDoA, but I suspect it is off the Mid Atlantic coast.
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I've heard these creatures also thrive in the 160m band, irritating HAMs.
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I've heard these creatures also thrive in the 160m band, irritating HAMs.
They were indeed a huge problem, I think many of them have moved out of the 160m band, although there could still be stragglers.
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Would you prefer a separate board for these? We already have HF beacons (originally meant to be the "pirate" beacons but ham and other beacons end up here as well) and the 22 meter beacon board. We could create one for the drift net / fishing beacons, and make all three of these sub boards of beacons category. Posts / threads can be moved, so as we find existing drift net beacon posts they can be re-located to the new board.
That sounds like an excellent idea. If we are taking votes on this, then I'm a YES.