C band feeds

[John]

@John

Thank you, I will give it a "whirl" tomorrow.
I have a couple of options for the LNB(F) and think I know where the offending tower is.

The dish is currently aimed at 46.0E so 60 degrees either side of that should be OK.
A fair chunk of that 120 degree field of view is blocked by buildings and trees, the mobile pallet dish only has 57E to 7W arc at its current location.

One comment re the video:
On the Promax I see you have set the span range on the Promax to full, I assume that is to show the level of 5G swamping up the frequency range all the way to 4200 MHz?

@John

Thank you, I will give it a "whirl" tomorrow.
I have a couple of options for the LNB(F) and think I know where the offending tower is.

The dish is currently aimed at 46.0E so 60 degrees either side of that should be OK.
A fair chunk of that 120 degree field of view is blocked by buildings and trees, the mobile pallet dish only has 57E to 7W arc at its current location.

One comment re the video:
On the Promax I see you have set the span range on the Promax to full, I assume that is to show the level of 5G swamping up the frequency range all the way to 4200 MHz?

>> One comment re the video:
On the Promax I see you have set the span range on the Promax to full, I assume that is to show the level of 5G swamping up the frequency range all the way to 4200 MHz? <<

Yep correct , once i get Christmas out of the way i might , and it is might, start thinking about getting a decent External 5G 3.9-4.2 filter and couple it to a new 5G Norsat lnb ??? who knows

 

[moonbase]

>> One comment re the video:
On the Promax I see you have set the span range on the Promax to full, I assume that is to show the level of 5G swamping up the frequency range all the way to 4200 MHz? <<

Yep correct , once i get Christmas out of the way i might , and it is might, start thinking about getting a decent External 5G 3.9-4.2 filter and couple it to a new 5G Norsat lnb ??? who knows

You gonna have to unbuckle the wallet and let the moths see daylight for those two jobbies unless you mug Santa big style !

 

[John]

You gonna have to unbuckle the wallet and let the moths see daylight for those two jobbies unless you mug Santa big style !

 

[moonbase]

'ere we go, picture of what I think might be the mast causing the interference
It is approximately 500 metres away and if I use dishpointer to get a direct central aim to the mast the dish is on 28.2.0E.

Is it a 5G mast?

.

 

[Channel Hopper]

'ere we go, picture of what I think might be the mast causing the interference
It is approximately 500 metres away and if I use dishpointer to get a direct central aim to the mast the dish is on 50.0E.

Is it a 5G mast?

.
View attachment 153518

On another thread somebody mentioned that particular design was not 5G though I'm not sure.

What's the approximate postcode ?

 

[moonbase]

I made a short video clip of the Promax connected to a C-Band LNB/Feed.
It's poor quality due to glare and the original plastic protective sheet still being on the screen.

I will repeat the test when its dark to get better visibility of the screen.
The fluctuating signal on the right side of the screen is at approx 3400 MHz.
I am not convinced now that I have 5G interference, any thoughts?

 

[ozumo]

'ere we go, picture of what I think might be the mast causing the interference
It is approximately 500 metres away and if I use dishpointer to get a direct central aim to the mast the dish is on 28.2.0E.

Is it a 5G mast?

.
View attachment 153518

Looks like a Hutchinson Jupiter Dual Stack monopole, I don't think these are used for 3.4-3.8GHz 5G.

https://pedroc.co.uk/content/vodafone-o2-monopoles

 

[moonbase]

Looks like a Hutchinson Jupiter Dual Stack monopole, I don't think these are used for 3.4-3.8GHz 5G.

https://pedroc.co.uk/content/vodafone-o2-monopoles

Thank you for the information.

I am starting to think it is a poor LNBF on the dish.
Plan A is to change it for another LNBF with narrower frequency range and what is described as a "WiMax Filter"
Plan B is to change it for an OMT with dual WR225 LNB's and a multiswitch.
Plan C involves spending wad....

 

[John]

'ere we go, picture of what I think might be the mast causing the interference
It is approximately 500 metres away and if I use dishpointer to get a direct central aim to the mast the dish is on 28.2.0E.

Is it a 5G mast?

.
View attachment 153518

The 5G ones that have appeared around me all seem to have the smaller tx/rx panels for 5G 3.4-3.8 sigs along with the taller panels for the 3G/4G sigs

..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

 

[John]

I made a short video clip of the Promax connected to a C-Band LNB/Feed.
It's poor quality due to glare and the original plastic protective sheet still being on the screen.

I will repeat the test when its dark to get better visibility of the screen.
The fluctuating signal on the right side of the screen is at approx 3400 MHz.
I am not convinced now that I have 5G interference, any thoughts?

That certainly looks like a signature evil 5G transmission MB - even thoughthe signal level is very high it doesn't seem to be saturating the lnbf on the test rig - on the dish is another story. Keep doing more tests over the next few months or so and watch how the operators start creeping up the band towards 3.8GHz with added frequency use.
Look forward to a night time video, also if you reduce the span down to say 200 or so and activate Max Hold etc you will get a better view of whats inside the main frequency.

 

[Channel Hopper]

Thank you for the information.

I am starting to think it is a poor LNBF on the dish.
Plan A is to change it for another LNBF with narrower frequency range and what is described as a "WiMax Filter"
Plan B is to change it for an OMT with dual WR225 LNB's and a multiswitch.
Plan C involves spending wad....

You may get away with carefully applied shielding at the end of the garden.

Some of them look very much like fence panels and they can be airbrushed on the neighbour's side to blend in.

 

[moonbase]

You may get away with carefully applied shielding at the end of the garden.

Some of them look very much like fence panels and they can be airbrushed on the neighbour's side to blend in.

It would be nice to get it resolved to see what solution cures or partially negates the issue.
However, it's not a "must have at all costs" situation.

If I can sort it out with minimum effort and expense that will be fine. I think shielding panels might just be a step beyond?
If it is not easily resolvable I have a dish on 46E for C-Band at another location that does not suffer the artefacts I am getting here.

 

[moonbase]

That certainly looks like a signature evil 5G transmission MB - even thoughthe signal level is very high it doesn't seem to be saturating the lnbf on the test rig - on the dish is another story. Keep doing more tests over the next few months or so and watch how the operators start creeping up the band towards 3.8GHz with added frequency use.
Look forward to a night time video, also if you reduce the span down to say 200 or so and activate Max Hold etc you will get a better view of whats inside the main frequency.

'ere we go, a few videos with better screen visibility.
The 3rd video uses "Max Hold" and a 200MHz span

It might be that there is another tower causing issues and not the one I uploaded the picture for earlier?
Further along the valley, part way up on the right side there is a fenced off tower with quite a few contraptions attached to the top.
I need to take a closer look at it to see what shape and height the units are at the top of this one.

 

[John]

'ere we go, a few videos with better screen visibility.
The 3rd video uses "Max Hold" and a 200MHz span

It might be that there is another tower causing issues and not the one I uploaded the picture for earlier?
Further along the valley, part way up on the right side there is a fenced off tower with quite a few contraptions attached to the top.
I need to take a closer look at it to see what shape and height the units are at the top of this one.

Nice one, did you spin yourself around 360° to see if you could detect any other incomers ? , your lucky at the moment that this one is lurking way down at the bottom of the band.
If you do go spinning, drape a wet cloth over the front of the feed to apply some signal damping of the present 3.4GHz 5G signal - it might show you some extra ones that are a bit further away.
Also next to do, with Max Hold on, is do the same with the Promax but with the dish looking at the satellite again showing the broadcast frequencies on a full band screen grab that will give you an idea how strong the 5G signal is to the weaker broadcast signals are - it might show you the desruptive 'wash' effect over the nearby broadcast signals ?.
Note:, not sure what the lnbf is your using but the signals to the far left of your screen doing the 'Mexican Wave' is aircraft Radio Altimeter sigs , 4.2 to 4.4GHz from passing overhead aircraft - i usually see them around the 4.3GHz area here.

 

[John]

Nice one, did you spin yourself around 360° to see if you could detect any other incomers ? , your lucky at the moment that this one is lurking way down at the bottom of the band.
If you do go spinning, drape a wet cloth over the front of the feed to apply some signal damping of the present 3.4GHz 5G signal - it might show you some extra ones that are a bit further away.
Also next to do, with Max Hold on, is do the same with the Promax but with the dish looking at the satellite again showing the broadcast frequencies on a full band screen grab that will give you an idea how strong the 5G signal is to the weaker broadcast signals are - it might show you the desruptive 'wash' effect over the nearby broadcast signals ?.
Note:, not sure what the lnbf is your using but the signals to the far left of your screen doing the 'Mexican Wave' is aircraft Radio Altimeter sigs , 4.2 to 4.4GHz from passing overhead aircraft - i usually see them around the 4.3GHz area here.

Been outside for a night time 360° scan also - draping a wet cloth over the front of the feed wasn't enough attenuation, had to roll it up and give it the full length up the feed for better results.
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

 

[moonbase]

Note:, not sure what the lnbf is your using but the signals to the far left of your screen doing the 'Mexican Wave' is aircraft Radio Altimeter sigs , 4.2 to 4.4GHz from passing overhead aircraft - i usually see them around the 4.3GHz area here.

John,

The LNB is an Astrotel Gold Precision, brand new old stock that I bought from a USA seller. The quoted frequency range is 3.4 to 4.2 GHz
I think @scopus or you have wan of these, they seem to get good reports even though they are quite an old model?

.

 

[scopus]

John,

The LNB is an Astrotel Gold Precision, brand new old stock that I bought from a USA seller. The quoted frequency range is 3.4 to 4.2 GHz
I think @scopus or you have wan of these, they seem to get good reports even though they are quite an old model?

.
View attachment 153525 View attachment 153526

MB..I have the Astrotel Gold, but the LNBF version...It is a good model..I had it from SSS many years back now..

 

[moonbase]

... did you spin yourself around 360° to see if you could detect any other incomers ? ...

Also next to do, with Max Hold on, is do the same with the Promax but with the dish looking at the satellite again showing the broadcast frequencies on a full band screen grab that will give you an idea how strong the 5G signal is to the weaker broadcast signals are - it might show you the desruptive 'wash' effect over the nearby broadcast signals ?...

I did not do the spin around 360 degrees, I only did the general direction of the dish.
It will be tomorrow probably for the 360 degree whirl with the feed and the Promax Max Hold using the dish reception .

I had not used the Max Hold functionality before today, is it similar to the "Persistence" feature, another wan I have not used?

 

[moonbase]

... had to roll it up and give it the full length up the feed for better results.

Oooh matron, sounds risky !

 

[John]

Oooh matron, sounds risky !

But nice