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Multi-tone QRM on 7032 KHz


#1

The wide-band multi-tone transmission which has caused infrequent disruption to SOTA activations on 7032 KHz appears to have settled on 7032 KHz as from yesterday, 28th Feb 2011.

It is 559 at my QTH, from 7030 to 7033 KHz. and totally swamping any SOTA activations in this band. Petr OK1EQ is currently operating just at the lower edge, on 7.029.5 KHz.

Activators are using 7027-7030 KHz to avoid this QRM.

73 Roy


#2

I can hear it right now up here in Glasgow but it is only S2 with a little QSB.

Mike GM0OAA


#3

In reply to GM0OAA:
Steady s8 here in JO49ub.


#4

In reply to LA1ENA:
At freq. 7.032 I have this “noise” at s9. Qth in JP41UQ.


#5

In reply to MW6BDV:
probably caused by
High Frequency Active Auroral Research Program (HAARP) ?

s6-9 in north pa last days.
73 Wim


#6

The same here in Hungary (JN97). It also appears S9+ on nearby (YO, LZ, even UT) WEBSDRs.
Janos HA4FY


#7

In reply to PA0WDG:

HAARP is in Alaska and the TX is blocked from using Amateur frequecies… A lot of power though!!!

see http://www.haarp.alaska.edu/haarp/faq.html

S7 in South Shropshire at this time…

73’s
Nik M5DND


#8

In reply to PA0WDG:

I doubt it’s HAARP.

Looking at it with Spectran shows lots of carrier groups. It’s wider than the SSB filter in my TS570 but there are 12, possibly 14 or maybe 16 carriers being modulated.

Andy
MM0FMF


#9

In reply to MM0FMF:

TXMN went off air approximately 1700z
Roy G4SSH


#10

In reply to G4SSH:

Missed it again!

I’ve just got in from work & although 7.032 is clear, there is wide QRM between 7.035 & 7.040, is this the same as earlier?

73,

Mark G0VOF

Edit: A quick check of a few web based receivers seems to answer my question. It is S9 to S9+5dB here in IO83SS


#11

In reply to G0VOF:

Hi Mark,

I’ve just got PSK31 wall to wall between those freqs… Cant hear same noise that was on earlier!

Cheers,
Nik M5DND


#12

In reply to M5DND:

Thanks Nik, it did sound like it could be the same from the descriptions above.

73,

Mark G0VOF


#13

In reply to G4SSH:

The QRM is not the geomagnetic storm going on now?

http://www.swpc.noaa.gov/

73, Jaakko OH7BF/F5VGL


#14

In reply to G4SSH:

The wide-band multi-tone transmission which has caused infrequent disruption to SOTA activations on 7032 KHz appears to have returned as from 0600 UTC this morning.

It is 539 at my QTH, from 7030 to 7033 KHz, rising to 599 during darkness hours.

If it follows previous patterns it will remain here for about 4 days before moving.

Activators are using 7027-7030 KHz to avoid this QRM.

73 Roy G4SSH


#15

In reply to G4SSH:

It makes a good tune-up frequency whilst it stays!

73

Brian G8ADD


#16

In reply to G4SSH:
I have just worked with F/HB9AFI Kurt @7.032 from F/AB-382 and I was compelled to give him 479 report as even if he produced nice strong signal in JN97PM, I could understand only about half of his message due to the multiple tone wide band jamming signal, even if I narrowed the bandwidth of my receiver to the minimum. :frowning:
The jamming signal we suffer from seems to originate from multiple sources. The reason of my thinking it is as follows:
For the time being there is a single jammed band section peaking at about 7.033 but the day before yesterday tuning up in order to check 7.118 I found another signal some 20-25 kHz higher. Now I can not detect it. That is, those seem to be independent from one another.
It’s good news that today we have only one jamming signal, but it’s bad news that it covers the band section mainly used for weak signal communication like QRP and SOTA activations. :frowning:
Recently IARU associations used to have band monitoring services reporting for local telecommunications authorities the non-amateur operations within the dedicated, exclusive HAM bands. I hope that these are still active and take due measures in order to clear our bands from intruders.

73: Jóska, HA5CW / M0HAA


#17

In reply to HA5CW:

… I hope that
these are still active and take due measures in order to clear our
bands from intruders.

http://www.iaru-r1.org/
-> Monitoring System (IARUMS)

No info on this QRM however as I can see it.

73, Jaakko OH7BF/F5VGL


#18

In reply to F5VGL:

latest news:

7032.000 ady dly RUS PSK2 120 2600 AT3004D - Rostov-na-Donu

Vy 73 Fritz HB9CSA/DL4FDM


#19

In reply to DL4FDM:
Vielen dank, lieber Fri!

Q: Is Russia member of the ITU?
A: Yes, it is!
Q: Are there radio amateurs in Russia?
A: Yes, there are plenty of them!
Q: Do they have a national amateur society?
A: Yes, they have!
Q: Are they IARU member?
A: Yes, they are!
Q: Did they notice the intruder?
A: Surely they also did!
Q: If this is the case, why don’t they submit immediately a very determined protest at the local competent authority as the most competent in the HAM community?
A: … :frowning:

The same applies for Ukraine, Kyrgyzstan, Indonesia, Sudan, Kuwait, etc. even is in a fairly minor extent as about 3/4 of the “official” intruders come from Russia…

Unfortunately, against the flood of CBers nothing else can help but a massive and permanent amateur traffic disabling their communication. :frowning:

73: Jóska, HA5CW/M0HAA


#20

In reply to G4SSH:
Being inspired by others I also monitored it on the band scope of a Slovenian SDR and found that the jamming signal covers the band section of 7025…7068 kHz …
Probably this is the reason, why most of the activators insist on using the good old 7031…7033 kHz section…

73: Jóska, HA5CW / M0HAA