Scrambled and/or useless signals on 48m

[Ray Lalleu]

(...)
Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

Been there often lately. Shortwave is full of unexplained stuff. And the spitting UTE on 6202, what is that all about? Can't think what function that performs...

On 27 June at 0945 : scrambled voice on 6215-6218 bandwidth.

Since LHH has moved to 6210 to avoid the spitting UTE on 6202-6203,
that spitting UTE has disappeared. Sounds to be only jamming...

[Jock Wilson]

The spitting UTE could return to hamper LHH's broadcasts anytime soon.

Unfortunately, it was an extremely effective jammer that had no right to have been there in the first place.

My take,

Over and out.

 

[Jock Wilson]

The spitting UTE could return to hamper LHH's broadcasts anytime soon.

Unfortunately, it was an extremely effective jammer that had no right to have been there in the first place.

My take,

Over and out.

Twente SDR, as I type, 6205 is LHH, reception is ruined by the spitting utility.

[texas1dxer]

2005 The KiwiSDR in Lower Odcombe UK, 6205 has a little of the spitter but LHH is so strong, the spitter is just annoying.

[ulx2]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

[Ray Lalleu]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

Spur heard on Sunday 23 June at 1900-2000z approx, disturbing Radio Doctor Tim on 6220.
I thought it could be the KBS relay disturbing also 6205 at the same time.
I should have checked with a second receiver direct on SW (don't use a stream or a different SDR for checking, because of different delays). The spurs are usually too much garbled to be identified directly, but by listening to the official frequency with the other ear, it can be identified . Hint : the spurs are quite often about 60 kHz away from the normal frequency.

edit : spur on 6205 from KBS relay on 6145 (via Wooferton?) everyday   at 1900-2000 utc

[Brian]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

6220-6155=65 KHz.
So possibly a faulty PDM filter in the transmitter.

Modern transmitters generate frequencies usually in the 60-80 KHz range. These must be filtered out before the antenna. Occasionally these filters fail. Most likely a capacitor.
I pointed out recently that one of the Woofferton transmitters had this issue. It wasn't the first and it won't be the last transmitter that this will happen to. Normally it's sorted out within a few days.

[The Ether Hacker]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

.... So Radio Havana, Cuba, is not the only "legal" station with badly serviced transmitters on 48 meters at the moment

[Jock Wilson]

If I were the owner of LHH, I'd do a couple of things.

1st  -   transmit in // on a second 6 Mhz frequency not close to 6205/6210, announcing both frequencies.

2nd -   use high power on the new frequency, and moderate power on 6205/6210.

3rd  -   reduce the Shoutcast LHH Internet Stream that carries the shortwave service from 192K to 32K
            to enable net users residing in countries with Internet restrictions to listen online. That would
            definitely benefit me.

DXing is a great hobby, but listening to a station's programmes on an Internet stream is a good alternative when said station cannot be received well via its transmitter or transmitters.

(Here in China, Weebly, Tune-In and Soundcloud are BLOCKED. In contrast, Mixcloud can be accessed, but there are buffering problems due to slow Internet for long periods. The best time period for me is from about 1700 UTC  to 0300 UTC.)

[fox558]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

Ah so legal stations cause more interference than pirates do and run dirty rigs. Does Iran have their equivalent of the FCC or ofcom?

[ulx2]

Does Iran have their equivalent of the FCC or ofcom?

Yes, Iranian equivalent of the FCC or Ofcom is the Communications Regulatory Authority (CRA) of The I.R. of Iran:

https://www.cra.ir/en/enhome

Removing national and international radio frequency interferences is their immediate task.

Since LHH has moved to 6210 to avoid the spitting UTE on 6202-6203,
that spitting UTE has disappeared. Sounds to be only jamming...

Results of the TDoA analysis for this UTE point to the northern coast of Turkey:



However, network of several transmitters in different locations can be active there too. The protocol is unfamiliar for me. I suppose 3G ALE (ARCS, STANAG 4538) GM2100 Rohde & Schwarz HF Modem. But it would be great if somebody could identify it more exactly.

[The Ether Hacker]

Talking of out of band, what is this 'noise' around 6220 currently?. You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled. I can't make it out at all on USB/LSB?

This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service. Now it is audible every evening here too.

Ah so legal stations cause more interference than pirates do and run dirty rigs. Does Iran have their equivalent of the FCC or ofcom?

Those who rule over us are generally ABOVE the laws THEY make ... don't you know....

[Jock Wilson]

Quote from: ulx2 Talking of out of band, what is this 'noise' around 6220 currently?.
                             You can hear it on the Twente SDR. Its like SSB and could be speech but is garbled.
                             I can't make it out at all on USB/LSB?

Quote from: fox558 This is spurious product from Iranian transmitter in Zahedan on 6155 kHz broadcasting VOIRI Arabic service.
                              Now it is audible every evening here too.

Quote from: The Ether Hacker Ah so legal stations cause more interference than pirates do and run dirty rigs.
                                             Does Iran have their equivalent of the FCC or ofcom?
                                             Those who rule over us are generally ABOVE the laws THEY make ... don't you know....

Like YOU, I KNOW.

Re LHHI, the programs on the two 48K AAC Shoutcast Internet streams do not match what is transmitted on 6210 at this time.

I'm glad I can access the station's Internet streams above most of the time without buffering problems.

The audio of the station via an SDR is up to a minute ahead of the station's audio via the 48K Internet stream.
 

[Ray Lalleu]

1940 utc :

spur from 6145 KBS Wooferton : on 6205 approx.

spur from 6155 IRIB : on 6220 approx.

[Brian]

1940 utc :

spur from 6145 KBS Wooferton : on 6205 approx.

spur from 6155 IRIB : on 6220 approx.

Both probably PDM filter faults.

Re the spitting jamming, I don't think this is deliberate jamming. An almost identical signal can be received on 6282ish.