70W C-Band

John

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EnoSat is showing, highlighted in red text on his graphic, the different graphic representation of rx signal footprint as apposed to where the visable Horizon boundary is of the 70°W satellite when looking from the satellite position.
To be honest , iv'e never seen the term 'Draw Footprint' used anywhere else , so have to say that iv'e been educated.
Back on topic - I did a bit of tweeking of focal point of the 2.2 PF, moved the feed block back just over 2mm and managed to gain a drop more performance, noticable on this mornings look at 70°West analog signals which looks better than iv'e seen them before.
Comparison readings of before and after focal point adjustments are noted on the Analyser grabs, every extra drop helps .... 55.5°W used .
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70°W. - 3.720H.png2.2mtr C-band feed block retarded back 2.5mm comparison..JPG
 

Captain Jack

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Thanks John for the explanation. A host of single-line posts (or no words at all) is very confusing.

That's a nice grab - is that still with the full blown LTE still in action?
 

John

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Thanks John for the explanation. A host of single-line posts (or no words at all) is very confusing.

That's a nice grab - is that still with the full blown LTE still in action?

Yes, LTE at max, although dropping the setting down a notch or two does not show too much difference. Also same with the deviation setting - it's a bit of a juggling act between the two settings to acheive the best result, another advantage for me is to do the viewing early morning before the lnb gets warmed up in the sun etc. Usually for me , late Autumn onwards when the outside temparatures drop and the big Oak tree about 150 mtrs away in line of sight looses most of its leaves gives me the best results.
 

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Last edited:

John

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Ok, starting off then - three grabs, Original 60mm I/D feed throat / 41mm I/D throat sleeve / 56.3mm I/D throat sleeve, sleeve's made from available scrap box metals. The experiment with 41mm I/D sleeve works but in the wrong frequency range. Anything below 4.5Ghz is dramaticaly reduced to the point of signal loss from 3.6 to 4.5GHz - signal very slightly degraded from 4.5 to 4.8GHz but getting through.
I'm pretty sure that the 56.3mm I/D sleeve marginally reduced the 5G signals without noticeably degrading 3.6 to 4.8GHz signal levels.
It would be interesting to try a 55mm I/D sleeve at some point but would have to buy in the material.
Looking at the feed entry pic, it shows how the sleeve will slide in and butt up to the Circular poloriser front input face - the Norsat 8000RI 3.6 to 4.8GHz is at RHC reception.
It passed away a few interesting hours to satisfy the curiousity i suppose but 5G interference, depending how close to the source you are is always going to be a tough one to eliminate successfully , if at all.
It might be interesting for people using an lnbf to experiment with inserting various sleeve pieces - you never know.
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View attachment 151239View attachment 151240

Brief OT thread update for experimental enthusiasts - - -
On my system , based on my 5G cell tower interference distance from me , this simple inner sleeve reduction exercise to find the best rx compromise for some low band 5G interference reduction without reducing performance from 3.7GHz or so upwards is actually baring fruit. I'm no RF engineer but alongside using my excellent Promax HD Ranger+ to record progress , i have made an improvement to my fringe low level signal receptions on more than one band. I have also been using a on line Circular wave guide cut-off calculator to get me in the ball park. Currently at 50mm I/D of the feed sleeve with good results , a section of 47.5mm I/D is next to try which if i take the calculator result as somewhat near to being reasonably accurate , also remember-i'm not a professional RF engineer, just a simple experimenter , this will possibly give me a rx range from ~ 3.7GHz upwards & giving some resistance to the interfering 5G signals lower down the band ?.
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2.2mtr C-band inner sleeve comparisons... c..jpg
 

Satfaca

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This brings me back memories on Chaparral's "Golden ring" solution in the 80s/90s, a ring was used in Polarotor/Corotor for deep dishes (f/D < .32) in order to reduce terrestrial interference (radar mostly at that time).

golden_ring.jpg
 

John

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My early morning scan, 2.2 PF, 17K North of Nottingham UK
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70° West - Hor scan. 22nd Aug. 23... 5G cell tower interference..jpg70° West - Ver scan. 22nd Aug. 23... 5G cell tower interference..jpg
 

John

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My early morning scan, 2.2 PF, 17K North of Nottingham UK
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View attachment 151448View attachment 151449


Latest 5G interference C-band frequency reception damage at my QTH, 17k North of Nottingham UK.
Reception now limited to 3.8 to 4.2 GHz normal, 4.5 to 4.8GHz Extended.

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LATEST - 70° West - Hor scan. 22nd Aug. 23... 5G cell tower interference..jpg
 

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@John without the 5G filters, are analogue transmissions still visible?
 

John

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@John without the 5G filters, are analogue transmissions still visible?

For me there not, the desructive up and down wash from one end to the other end of the band from the local 5G 3.8Ghz frequency tower 300mtrs away is just too strong without the filter. there's only one watchable Analogue signal for me with the filter in and thats 3.810 Hor PAL . I can see on the analyser 3.890 Hor and 4.10 Vertical PAL but they are very very weak compared to say nine months or so ago.
 

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I should try it again - I've no idea what 5G situation is like in my neck of the woods. Certainly my phone doesn't get it (I barely have 4G)....
 

John

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I'm just trialling a Norsat 3200F-BPF-8 5G lnb at the moment and these two grabs are from using it - The digital signal levels are very close to lock on my 2.2 PF, a 5G polution free area could do better with them.
The two Hor PAL sigs 3.890 H & 3.810 H shown.

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70_W Hor Digitals&PAL_+ 5G burst.jpg70_W. Vert,Digitals &PAL + 5G burst..png
 

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i think my dish would keel over at 70w and if need geoff capes to help me bring it back :)
well done both
 

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i think my dish would keel over at 70w and if need geoff capes to help me bring it back :)
well done both
I can get just beyond 71East on the roof but I would struggle with the neighbours accepting the larger dish up there.
 

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I should try it again - I've no idea what 5G situation is like in my neck of the woods. Certainly my phone doesn't get it (I barely have 4G)....

The strong-ish signal at 3.810 H would be interesting to try , it seems to be encryption of some sort which i can't remember seeing previously. My LT8700 can't make anything out of it no matter what settings i try. See vid.
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Captain Jack

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The strong-ish signal at 3.810 H would be interesting to try , it seems to be encryption of some sort which i can't remember seeing previously. My LT8700 can't make anything out of it no matter what settings i try. See vid.
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Looks like 5G crap to me still... Maybe the LT8700 is confused due to the said interference?
 

John

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Looks like 5G crap to me still... Maybe the LT8700 is confused due to the said interference?

Hmmm it might be but not 100% sure as i can receive 3.890 H ok allthough a lot weaker than the 3.810 H signal vid posted #97. I'll put an extra 5G filter, the ALGA RED , in front of the Norsat 3200F-BPF-8 and observe the difference.
 

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Hmmm it might be but not 100% sure as i can receive 3.890 H ok allthough a lot weaker than the 3.810 H signal vid posted #97. I'll put an extra 5G filter, the ALGA RED , in front of the Norsat 3200F-BPF-8 and observe the difference.


Them ALGA Red's are reet top class 5G bandpass filters, top Pro grade.
Just so happens that I have some for sale at huge wad
 
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