Re: Help in identying a jamming signal

[Mitja kocjančič]

Hello there, I managed to record 10Mhz of sample rate which u can find here: https://transfer.sh/vxuyz7zPyH/SDRSharp_20230928_110124Z_676100000Hz_IQ.wav

It seams that interfering signal is infact DVB-T on Channel 46 with Center frequency of 674 MHz
I also managed to capture that interference channel which you can find here: https://transfer.sh/MFmwlKWYG8/AirSpy_20230928_132144Z_674000kHz_IQ.wav

I hope the signal is strong enough to be able to decode something
I believe the MUX is M2 from PayTV Provider called EvoTv from Croatia: https://www.hrvatskitelekom.hr/evotv

How cuold this interfere me
I am receiving here: https://maps.app.goo.gl/YeNntbpAk25eMjjC8

I am trying to receive 20kW Federalna Televizija on Channel 47 (PAL B/G) from Velika Gomila: https://fmscan.org/transmitter.php?t=1100309

The interference signal is located in Lička Plješivica, Mirkovica and Stipanov Grič (DVB-T):
https://hr.wikipedia.org/wiki/Dodatak:Popis_oda%C5%A1ilja%C4%8Dkih_objekata_OiV-a
 

The interference signal is on Channel 46, my Signal of interest is on Channel 47, thats one channel apart, how can interference even happen
I a bit confused
 

V V čet., 28. sep. 2023 ob 16:25 je oseba Fabian Schwartau <fabian@opencode.eu> napisala:

Do you know this site?
https://www.sigidwiki.com/wiki/Signal_Identification_Guide

I had a short peek and could not find anything, but you may have a bit
more patience.

Best
Fabian

Am 27.09.23 um 13:21 schrieb veso266@gmail.com:
>
> Hello there all, I hope someone can help me
>
> I am trying to watch some television on CH47 (679.25Mhz)
>
> I am in Slovenia and I am trying to receive and watch Federalna
> Televizija transmitting from Bosnia and Herzegovina (BiH)
>
> But there is very anoying signal bothering me, you can see the problem
> here: https://youtu.be/wt4vEfu7yEI?si=XDQ8wQ-rK-lb8LMW
>
> Instead of seing PAL and hearing sound, I see this anoying lines and
> hear digital data :(
>
> So I decided to bring my Airspy R2 to visually see and record some IQ
> data on whats going on
>
> So this is what I recorded:
> https://transfer.sh/dMhDtqnodK/baseband_679250000Hz_14-23-42_26-09-2023.wav
>
> Center frequency was 679.25Mhz but sadly I was only able to record about
> 2.5Mhz of Bandwith, because my phone could not handle full 10Mhz
>
> As you can see PAL was bearly able to get through this jamming signal
>
> At first I thought it could be 600Mhz 5G NR which is sadly right where I
> want to receive  (663 – 698 Uplink, 617 – 652 Downlink), but thats only
> for US, not Europe
>
> The next suspect could be 5G Extended Lower SMH (which has downlink from
> 698 – 716) but its 20Mhz above my signal, PAL only needs about 6-8Mhz so
> this should not be a problem
>
> Then I thought maybe LTE Lower SMH on 700MHz could be the culprit, which
> again doesnt make any sense (Downlink on 699 – 716Mhz)
>
> I hope something could be done
>
> At least to figure out what signal that is so I can complain to relevant
> local authorities
>
> I am there for a 3 more days, so if needed I can do more messurments
>
> Sadly I only brought Airspy HF+, and Airspy R2 with me nothing more
> capable bandwith vise
>
> I also have Samsung Galaxy S10+ if it can maybe help in messuring LTE
> signals somehow
>
> Thanks to everyone for anwsering
> --
> Sent from myMail for Android
>