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Author Topic: Scrambled and/or useless signals on 48m  (Read 2452 times)

Offline Brian

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Re: Scrambled and/or useless signals on 48m
« Reply #15 on: June 29, 2019, 1857 UTC »
1940 utc :



spur from 6155 IRIB : on 6220 approx.

Again now.

Offline The Ether Hacker

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Re: Scrambled and/or useless signals on 48m
« Reply #16 on: June 29, 2019, 1932 UTC »
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.

On my Kenwood HF scanner, if a high power signal is received too strong, it can cause interference on other frequencies around the band, I have an attenuator switch I can use to lessen the signal overdrive... it has nothing to do with the transmitters though, simply a high power HF signal being received too strongly.  My attenuator switch allows me to attenuate reception by 10 to 40 db in 4 stages.
Antennas: Multi-band doublet for 80 to 10m HF and vertical groundplane
RX: Kenwood R-2000
QTH: Northern England

Offline Ray Lalleu

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Re: Scrambled and/or useless signals on 48m
« Reply #17 on: June 29, 2019, 1946 UTC »
On my Kenwood HF scanner, if a high power signal is received too strong, it can cause interference on other frequencies around the band, I have an attenuator switch I can use to lessen the signal overdrive... it has nothing to do with the transmitters though, simply a high power HF signal being received too strongly.  My attenuator switch allows me to attenuate reception by 10 to 40 db in 4 stages.
What a pity ! Attenuate the antenna signals because just behind there is too much amplification !
I rarely use the ATTN , I can set the RF gain lower. And the ATU really tunes.
Believe me, those spurs are spurs !
D/E/F/G/It/Sp : Dutch/English/French/German/Italian/Spanish
+/- : about 0.02 offset, ++/-- 0.03/0.04 offset
Balanced wire antennas, wire lines and ATU
*** Mes pages ex-OEM : semaines des OC, radios-médias, techniques de réception, en français, demandez  les ! ***

Offline Brian

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Re: Scrambled and/or useless signals on 48m
« Reply #18 on: June 29, 2019, 2015 UTC »
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.

On my Kenwood HF scanner, if a high power signal is received too strong, it can cause interference on other frequencies around the band, I have an attenuator switch I can use to lessen the signal overdrive... it has nothing to do with the transmitters though, simply a high power HF signal being received too strongly.  My attenuator switch allows me to attenuate reception by 10 to 40 db in 4 stages.

In your case, perhaps not but the spurs mentioned are faults in the transmitters.


Offline fox558

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Re: Scrambled and/or useless signals on 48m
« Reply #19 on: July 03, 2019, 2335 UTC »
Tonight we have the usual spitting utility on 6203 6204 but now another CW type utility on top of it.

What's this? Utility jamming out utility now? It sounds very useless to me.
And Laser moved away

Offline ulx2

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Re: Scrambled and/or useless signals on 48m
« Reply #20 on: July 04, 2019, 0031 UTC »
Tonight we have the usual spitting utility on 6203 6204 but now another CW type utility on top of it.

What's this? Utility jamming out utility now? It sounds very useless to me.
And Laser moved away

The CW/FSK utility on 6204 kHz is RIT navy transmitter near Severomorsk (according to my previous observations). RIT is quite active these days, and the most probable reason is recent incident with russian submarine in Barents sea.
« Last Edit: July 04, 2019, 0057 UTC by ulx2 »
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline Harmony

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Re: Scrambled and/or useless signals on 48m
« Reply #21 on: July 04, 2019, 1033 UTC »
I have a contact at WOF. I've asked him to investigate this sprog.

This could be the culprit:





 

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