Date
1 - 20 of 27
Steerable antenna anyone?
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Anybody got a direction of the source of QRM on 17m in the AM here in USA?
My beams are fixed due to the tower tops occupied with VHF/UHF repeater antennas. I usually operate in the upper portion of 17m. 😡🤬 73 Kriss KA1GJU |
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I tried the Kiwi SDR TDoa, but it appears very few have decent antennas attached. The plot would give widely different
locations with every run. Time to hike up to shop and do an A/B test with the SteppIR's. 73 Kriss KA1GJU |
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Hi
Thats everywhere.. 160-17 maybe higher. Some just stays there 24/7 some randomly changes frequency.. Thoughts are.).been discussed here i think) A over horizon radar B new commercial data for stock exchange’s.. Whatever it is has no regard for the likes of us.it often is on 80m..40m 160m etc.. Atleast it a good indication of when bands are good..not that helps really. Simon g0zen |
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Roger Shaltry
If you have not tried killing your main power or one breaker at a time then it would be worthwhile. I fought interference for a few years and finally tracked it down to a cordless phone charger in another room. As soon as I unplugged it the spectrum was good again.
Good luck |
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It’s not local, it appears for an hour or so in the AM and is heard on my server network both here at my QTH (KA1GJU Super Stations #1-4) and 13 miles away at our local radio clubhouse (KA1GJU@PCARC). Weather tomorrow is supposed to be good, will hike out to shop and check |
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Brian
Like Mag loop Simon I find such on all HF bands - seems to follow the MUF and propagation.
Has recently been 100kHz wide centered on 28.0MHz. They seem to avoid the heavily populated FT8 frequencies. My bet is Chinese over the horizon radar. 73 Brian. |
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The SteppIR's confirm it's East of my location in NH. I pulled out my active magnetic loop antenna and it appears to be emanating from ~060 degrees. I could hear it on Simon's server at an S9, but not sure what direction his loop is aiming.
It's been jumping around the 17/16M band... Here's a comparison (hard to do with two totally different antennas) of the noise. My QTH on left, Simon's on the right: 73 Kriss KA1GJU |
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N2MS
Kriss,
Are you refering to that pulse signal that lasts for about a second? I noticed it yesterday while monitoring 10 meters. I am hearing it this morning on 18445, 18465, 18486 and 18610. I don't have a directional antenna.
Mike N2MS
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N2MS
It seems to be spread over the 10MHz maritime band. I am also hearing it on the 16MHz maritime band.
Mike N2MS
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N2MS
Correction.
It seems to be spread over the 18MHz maritime band. I am also hearing it on the 16MHz maritime band.
Mike N2MS
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Here are two recordings, you will notice via the untrained ear that they sound slightly different (baud rate?). The signal is continuous for +10 minutes at a time. Not a short burst.
Firing up the active loop again... 73 Kriss KA1GJU |
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N2MS
Some type of HF Radar? Check the "29B6 Kontaynet OTH Radar" at this site:
Mike N2MS
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Dennis Matzen
I think this is the same seen here (Southern OR USA).
-- Dennis KA6FUB |
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Hi Dennis
That i think is frequency hoping data.. It also appears on 7mhz..etc.. I cant remember the post and internet pages that went into great depth about that..but it is usa uk etc gov approved.. There is also the Russian, Australian.USA, China etc over the horizon radars, who answer to no one.. Something we have to accept unfortunately.. Simon.. |
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Dennis Matzen
Thanks Simon...
-- Dennis KA6FUB |
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Mike (N2MS),
Sure sounds similar, but at 060 degrees with +/-10 of uncertainty, places it in one of the Russian Republics possibly. O60 degree plot from my QTH: Be a BIG bummer when this this appears on 20M phone section of the band this weekend! 73 Kriss KA1GJU |
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BTW... The SteppIR's place both signals recorded above East of me, and the magnetic loop placed them both at approximate 060 deg.
Too bad the Kiwi Sysops have real crappy antennas on their SDR's. Anyone know of some Kiwi SDR's sites that actually have a useful antenna on 20-17m? I gave up after 20 minutes of useless RXR's. Kriss KA1GJU |
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jdow
I wonder what somebody in Greenland or Iceland might
see. Greenland might be the closer location to the source if it is
East of you and significantly stronger than at Simon's place.
toggle quoted message
Show quoted text
{^_^} On 20211029 10:33:16, Kriss Kliegle
KA1GJU wrote:
BTW... The SteppIR's place both signals recorded above East of me, and the magnetic loop placed them both at approximate 060 deg. |
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Brendan Wahl
Dennis KA6FUB - those bursts you're seeing are the USN's ROTHR, with several sites in CONUS and elsewhere. The other, continuous transmission is most likely/certainly on of the "Konteynr" OTHR sites from Russia. Mind you, from up here in NW Washington, I've seen Konteynr, ROTHR, the Chinese systems, the UK's stuff from Cyprus, and JORN - the Aussie system, very common out here on the left coast. There are a lot of OTHR systems, and it seems more show up all the time.
The waterfall signature, sound, and width generally distinguishes the OTHR systems from the wideband HF Data users - the high-speed trading signals - rather well. The HS stuff stays on frequency, the OTHR's are all over the place by comparison. Brendan WA7HL |
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Hi Brendon
Spot on..though the bursts of data changing frequency I know as the data transmission..( short bursts , maybe 100khz apart, skipping in frequency.) ——- ——- ——— —— —— Etc. The othr changes frequency often, but is constant untill changes..following max muf or max range. Thing is…we are buggered in the respect that all are government approved ( in each country) so there is nothing we can do..however good for tuning up in and trying out amps, tuning antennas etc..lol.. Simon g0zen |
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