40M radar interference

Electromagnetic Compatibility, TVI, BCI, etc Interference Issues

40M radar interference

Postby VK2AOH » Sun Sep 30, 2018 7:35 pm

Presume its radar a loud harsh stacatto buzzing on 40M. Seems to be more or less centered on 7027KHz, down to about 7007KHz and upto about 7047KHz.


Starts around 4.00pm EST and have heard it till about 8.00am EST.


Very strong s9+ here in Bathurst.

Anyone else getting plastered by this or is it just me ?

Regards, Wal VK2WP
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Re: 40M radar interference

Postby VK5EI » Sun Sep 30, 2018 8:10 pm

Yes Wal,

It has been hammering us for the last week

}:[ }:[
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Re: 40M radar interference

Postby VK2AOH » Mon Oct 01, 2018 6:21 am

It has been running for a while and pretty well wiping out 40M. When those Russian wargames were going there was all sorts of OHR appearing all over the bands.

Saw quite a few comments on other forums.

This one seems to be a fixture at least for the present. Don't know whether it is just affecting us in Oceania or is more widespread.
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Re: 40M radar interference

Postby VK2CSW » Tue Oct 02, 2018 10:01 am

The USN has, reportedly, been executing Freedom of Navigation transits (both naval and air) around the Spratly Islands over the past few days.

This has led to some tensions. I would guess this would result in the Chinese OTHR being 'pointed' this way.

https://www.cbsnews.com/news/us-navy-cr ... 018-10-01/
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Re: 40M radar interference

Postby ZL3OZ » Tue Oct 02, 2018 11:45 am

I would suggest to get a better feel of its world wide coverage is to go to WEBSDR.ORG or SDR.HU and start listening from different parts of the world. I just put up with the lousy thing so have not done this yet, bad enough combating local digital house noise from town at S7 on 40.
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Re: 40M radar interference

Postby VK2AOH » Tue Oct 02, 2018 3:30 pm

Thanks for the comments re Spratly Islands and have seen news reports incidents between the USN and the Chinese on rights of passage.

Which would explain this spat of Chinese OHR interference which apart from tracking ships is probably a form of electronic intimidation.

Will listen again tonight and log a few times then put a report into the WIA. About all that can be done I think.

Cheers, Wal VK2WP

A footnote when the recent Russian naval exercises were in full swing there was all sorts of radar interference on the ham bands. There was comment on QRZ re this.
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Re: 40M radar interference

Postby VK2CSW » Wed Oct 03, 2018 7:12 pm

Well it appears there were some "silly buggers" being played...

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Re: 40M radar interference

Postby VK2AOH » Thu Oct 04, 2018 6:18 am

A day ago at 0920UTC the Chinese OHR radar stopped and moved to just below the 40M amateur allocation. No longer a bother to us on 40M happily however must be a nuisance to the S/W broadcasters and other services.

A very wide 234KHz signal and as before very strong.
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Re: 40M radar interference

Postby VK2AOH » Thu Oct 04, 2018 8:47 am

Sent off a intruder report to the WIA even though it is now gone. Could be a return visit some time in the future.

73, Wal VK2WP
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Re: 40M radar interference

Postby VK2AOH » Thu Oct 04, 2018 1:41 pm

For those whom may wish to send in a report on this OTH radar or others, following is a link to the WIA IARU intruder report form which is very easy to fill out.

http://www.wia.org.au/members/protecting...derreport/

Apparently this particular one has been about before.

Thanks to those whom send in reports. Every report helps to keeping our bands clear of intruders.
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