42.0°E Türksat 5B

I tried to use the one on the right with LO 11.8 GHz but got no signal. Instead, I got in / repeated frequencies below.
I wonder if the extension signal is that weak in my area(?), because in Ku-band, I have almost a DTH signal on Turksat at 42.0E.

I have to keep trying.

qwer  satesco

I think that there are big problems with the BWEI LNBs on Ext KU. They appear to have very poor image rejection which gives the effect you see. It is especially bad on 42E due to the strong signals below 12.75GHz. I don't think they have much RF filtering. There is also the problem of unwanted sampling modes in TBS and other cards.

One way to check if you are 'seeing' an image is to look at the Spectrum box on CS which usually shows 'Inverted' on most signals. If it shows as non-inverted, it's likely to be an image response.

My modified SMW is a 12.25-12.75GHz PLL which had an LO of 11.3GHz. I have changed the LO to 11.75GHz and tried to improve the performance on ext Ku. However although the NF is 2dB, the gain is 20dB down compared to its response at 12GHz. I use a 1.5GHz high pass filter followed by an 18dB gain amplifier in the IF. I still see an increase in noise when pointing at the strongest satellites and this is probably caused by front end overload.

Quote from qwer

Nothing from 13497 H 13330 on 1.2m from my place - only carreir on 13526 H is visible here...

/edit: Sorry guys... it´s my vertical spectrum here!

Okay... sorry about my last scan above, it was from vertical spectrum... but now, I´ve changed in horizontal spectrum (it seems)...probably a more exactly skew is needed for a better signal... scan with 1.2m KATHREIN Offset antenna...

I optimized LNB skew for horizontal range

Now I reach about 6.0dB over LM on my 1.2m dish from my pace on TC at:
13497 H 13330 3/4 DVB-S

PS: I´m using CS tool for showing correct polarisation here.

Good signal for my 1.2m in the early evening hours... about 7.5dB over LM on:
13497 H 13330 3/4 DVB-S

Quote from qwer

13497 H 13330 3/4 DVB-S

13497 H and peak on 13526 H have left...

Wenn das Spektrum auch noch dazu passt, ist die Welt für mich wieder in Ordnung

Just a look in year 2025... nothing appeared in horizontal extended range...

It's been a while but here are today's scans.

Using an SMW Ku LNA front end, 1.3dB measured noise figure, 15.793GHz LO (to give 2.3GHz IF). 1.8m PF dish.

Thanks s-band and jaes
13492 H 8333 2/43 DVB-S2 8PSK, TRT World HD, Türksat Tantim HD

...arrrgh... I always have a look here an my fixed 1.2m KATHREIN dish.... but not checked last weeks....

Thanks s-band and jaes

Aber H und V ist für mich ein wenig suspekt, dem muss ich noch nachgehen. Der vertikale Pegel ist etwas höher.
But H and V are a little suspect to me, I still have to look into that. The vertical level is a bit higher.

Ah, okay...sorry habe nur horizontal probiert...

The rain stopped so I could go up to the roof and manually turn the feed. It looks like there are 2 separate transmissions, one on each polarisation. Looking at the spectrum, the shape is different between V (blue) & H (red). I can't demodulate with the system as it is to check the program material.

femi Both the signal and transponder noise look a little higher on vertical polarisation.

I think if you were to turn the feed whilst looking at the SNR, the SNR would be poor as soon at the one or other polarisation was not in a null.

<edit> An hour after the plot above, the signal level has dropped but the TP noise is the same. The signals on both V & H are now below threshold relative to the TP noise. Plot below is V, ignore the reference level as I didn't set it as per the one above. The levels relative to noise are correct.

Here's a picture of the LNA

Weather is too windy and rainy at the moment for changing polarisation.... signal is lockable in horizontal at this time.... 17-30 CET

Quite strong today morning...

Content on 13492 is off since a couple of weeks... here my vertical "test" scan on my big mesh off focus
(12574/12609 are from strong horizontal polarisation)

And my current scan in horizontal polarisation, using my fix 1.2m dish...

Just anther look here... but nothing is visible in extended Ku ranges

Found by John on SatsUK jaes

13505V

13545V

1.2m dish