36B at 36.0°E

[Vipersan]

I've just put the C back on, if i scan 12092 12244 scans in, also using 10750 lnb setting it wont lock it, 9750/10600 is fine and 10600, certainly getting better results with a normal lnb, i will try a plate in a normal one .

Also take note of something I mentioned earlier ..
set your linear lnb at 45 degrees when fitting on the dish with plate inserted ..
This gives no preference to H or V ...so as close to null reception for linear as is possible with this type of lnb ..
and therefore favouring circular reception ..to which the lnbs physical orientation makes no odds ..
Only the plates orientation relative to the lnb probes becomes relevant..
At least thats what I found..

 

[Archived-1]

Thanks Evan, i thought @hvdh said it made no difference i must have read it wrong, i will give it a go, i want to check a few more first, waiting for the cloud's to clear atm

 

[Vipersan]

Thanks Evan, i thought @hvdh said it made no difference i must have read it wrong, i will give it a go, i just went to check a few more, waiting for the cloud's to clear atm

Well ..
he is correct ..
it will make no real difference in normal circumstances ...
Where it would make a difference is where the same frequency is used in 2 areas of the world ..one beam being circular ...and one beam using Linear ...
If you where located at the confluence or overlap of these 2 beams they would be fighting each other for dominance ..on that frequency ..
In theory biasing for circular and reducing linear influence would then be of some benefit.
Or perhaps my logical brain is overthinking this ...
It wouldn't be the first time ..
lol

 

[Archived-1]

Thanks again Evan, at the end of the day i will try anything suggested, skewing the lnb takes seconds so nothing to lose, ive already marked one up, do i skew clockwise/anti looking at it from the rear of the dish from its normal position please.

 

[Vipersan]

Thanks again Evan, at the end of the day i will try anything suggested, skewing the lnb takes seconds so nothing to lose, ive already marked one up, do i skew clockwise/anti looking at it from the rear of the dish.

If my theory is correct ..then direction of skew is unimportant ..so long as you position 45 degrees to normal positioning..

 

[Archived-1]

It does put the plate in a different position if i skew 45 AC 45 C, so as long as its 45 it does not matter were the plate is / should be?

 

[Vipersan]

It does put the plate in a different position if i skew 45 AC 45 C, so as long as its 45 it does not matter were the plate is ?

Not sure you're getting this fully buddy ..
By including a plate in the lnb throat at 45 degrees to one of the probes ..you are choosing RHCP or LHCP ..for that probe..
..depending on wether the plate is clockwise or counterclockwise of the probe..
If you then rotate that plate through 90 degrees you select the opposite ..
The probe in question now receives the opposite circular polarised signal ..
Thus RHCP becomes LHCP and vice versa ..
BUT by rotating the lnb physically ..this also rotates the physical positioning of the probe ..
Thus reducing it's ability to receive and capture linear signals ..
In short ..
When receiving circular with a linear lnb and plate ..the only consideration is the plate position relative to the probe ..all else being irrelevant..
rgds
VS

 

[Archived-1]

I understand what your saying Evan, but when you skew one way rather than the other it puts the little pins inside the lnb in a different place, so your saying this makes no difference what so ever ? as long as its 45 degree ?

 

[Archived-1]

Poor results with the new black ultra on 12092, i am getting 40% with cloud cover using the TM 0.2, no cloud atm BU results

 

[Archived-1]

Both examples here

 

[Vipersan]

I understand what your saying Evan, but when you skew one way rather than the other it puts the little pins inside the lnb in a different place, so your saying this makes no difference what so ever ? as long as its 45 degree ?

Exactly right ..
Not when receiving circular ..
Pin/probe postiting only relevant in linear mode.

 

[Vipersan]

Exactly right ..
Not when receiving circular ..
Pin/probe postiting only relevant in linear mode.

Though in your photo above I'd probably bisect the 90 degree angle created by the 2 probes with my plate at 45 degrees..

In the photos both examples would yield exactly the same results ..

 

[Archived-1]

Thanks Even, lol it was just an example i wasn't going to put the inclinometer on them i work with angles nearly every day

 

[Vipersan]

Thanks Even, lol it was just an example i wasn't going to put the inclinometer on them i work with angles nearly every day

No I wasn't having a dig ..
I just meant I'd bisect here >>

 

[Archived-1]

bisect i had to google that speak Yorkshire please pal lol, swap the plate to the other oil lmao, thanks pal will give it a go with and without skew

 

[Vipersan]

bisect i had to google that speak Yorkshire please pal lol, swap the plate to the other oil lmao, thanks pal will give it a go with and without skew

It all depends of course on which of the probes is activated by 13v (V) and which probe is active at 18v (H)
Impossible to tell from a photo ..
..and really ..it's unimportant other than for convention ..
I and most others tend to ascociate 13v - V with R ...not L
13v - Rhcp - Vert
18v - Lhcp - Horiz
and where you bisect the probes would affect this relationship.

 

[Archived-1]

That's great thanks again, slowly understanding this more , just started making a plate i will finish it after tea,

 

[Vipersan]

bisect i had to google that speak Yorkshire please pal lol, swap the plate to the other oil lmao, thanks pal will give it a go with and without skew

In truth ...my theory about skewing the lnb through 45 degrees should only improve linear rejection if it were there in the first place ..
eg this example from 36E

11862 H
tp EA8
Sub-Sahara Africa
0

​

DSTV Africa
DVB-S
Irdeto 2 27500-3/4
878-65501
5.5
Tony G
150606
11862 R
tp ER8
Russia
0

​

NTV Plus
DVB-S
Viaccess 4.0
Viaccess 5.0
Viaccess 6.0 27500-3/4
112-15
5.5
A Sicsa
150721

and only then if convention had been ignored and the lnb had been set up for the Africa beam ..and the plate had been set to receive the R on the H probe ...and you lived at a location that could see both beams at similar levels..
Hope this makes sense..

 

[Archived-1]

Yes that makes sense Evan i think, if i had two similar strength signals L/R on the same TP they would be fighting to lock both signals, by skewing it will concentrate on only one ?

 

[Vipersan]

Yes that makes sense Evan i think, if i had two similar strength signals L/R on the same TP they would be fighting to lock both signals, by skewing it will concentrate on only one ?

Zactly !!!

Except you wouldn't have L/R on the same frequency ..
More like you'd have H/R ..
So by chosing 2 different polarities Linear and circular ..and arranging the plate relative to the probe ..ie lnb constructed by/for and dedicated for the sevice providers signal ..they can theoretically re-use the same frequency depending on location ..
But we are trying to do the opposite ...as DXers ..but have the ability to be 'selective'