Installing Dishes In Spain for 2E Chit-Chat

[Huevos]

when you got motorized PFA
Is there a difference In skew for Astra 28.2 and 19.2 to get better signal level
I remember that Astra 1 H was with offset

Whether or not it is PFA or offset is of no relevance to the skew. Astra satellites are skewed pre-skewed 7.5º. So looking at the dish from the front you need to twist the LNB 7.5º anti-clockwise from neutral skew.

 

[Menorca Man]

Whether or not it is PFA or offset is of no relevance to the skew. Astra satellites are skewed pre-skewed 7.5º. So looking at the dish from the front you need to twist the LNB 7.5º anti-clockwise from neutral skew.

Hi H,

Well, if you add that +7.5 degs to dishpointer.com's 2F calculation of -18.7 degs for my location, that would put the other sites I checked and my smartphone GPS app inline (-26.2 + +7.5 = -18.7). Therefore it seems possible that these other sites and my GPS app have ignored the Astra satellites pre-skew. If that's the case then it begs another question - is Astra 2E not pre-skewed or has dishpointer.com forgotten to take it into account? Because, for that particular satellite, their calculation comes out at -26.3)!!

Regards

 

[Huevos]

Dishpointer takes it into account. Compare with 26E and 30E to see ehat I mean.

 

[samoloko]

Whether or not it is PFA or offset is of no relevance to the skew. Astra satellites are skewed pre-skewed 7.5º. So looking at the dish from the front you need to twist the LNB 7.5º anti-clockwise from neutral skew.

thank you for reply
but I would like to know If you have same skew position on lnb holder for both Astra 19.2 and 28.2 on motorized PFA or there Is a small offset between if you aim to get best signal level
when Astra 1H was on 19.2 It has an offset related to skew on satellite arc

 

[timo_w2s]

What is the point of this non standard skew on Astra 2? Especially since Eutlesat 28A doesn't have it and neither do most other satellites and they don't seem any worse off for it?

 

[Huevos]

What is the point of this non standard skew on Astra 2? Especially since Eutlesat 28A doesn't have it and neither do most other satellites and they don't seem any worse off for it?

"To reduce the polarisation offset angle to a minimum at reception sites in the centre of the Astra footprints"...

http://www.satellites.co.uk/forums/...on_and_frequency_allocations_1_0_0-pdf.51252/

 

[Menorca Man]

Ok, maybe I'm thick or something but it still hasn't been satisfactorily explained to me why dishpointer.com's calculated skew angles are so different for two adjacent Astra 2 satellites, both of which are supposedly pre-skewed. Astra 2E and 2F are separated in space by a mere 0.2 degrees, yet dishpointer.com says the skew angle for 2E at 28.4E is -26.3 degs and that for 2F at 28.2E is -18.7 degs. Both dishpointer.com calculations are for my precise location in Ciutadella de Menorca.

To my non-expert mind there can only be one logical answer:
a) One of those two satellites isn't pre-skewed.
b) They are both pre-skewed but to greatly different angles.
c) They are both pre-skewed to the same angle but dishpointer.com has got it wrong for one of them.

So which is it?!

 

[Huevos]

c) is correct

 

[Menorca Man]

c) is correct

Phew, at last! Thanks Huevos. That's what I have been alluding to all along!! I therefore assume it's their calculation for 2E that's out of kilter.

 

[Huevos]

Yes. LNB should be somewhere between 6 and 7 o'clock.

 

[Pride Of Cucamonga]

"To reduce the polarisation offset angle to a minimum at reception sites in the centre of the Astra footprints"...

http://www.satellites.co.uk/forums/...on_and_frequency_allocations_1_0_0-pdf.51252/

But what actual advantage does this give? is too much skew at the western fringes problematic? thanks

 

[Menorca Man]

OK. I've started a new thread in the official dishpointer.com forum (http://www.satelliteguys.us/xen/threads/dishpointer-coms-lnb-skew-calculation-for-astra-2e.342425/), pointing out our findings regarding their Astra 2E LNB skew angle calculation. Hopefully dishpointer.com agrees with our conclusion and includes the +7.5 offset in their algorithm behind the 2E calculation.

 

[Huevos]

But what actual advantage does this give? is too much skew at the western fringes problematic? thanks

A mini dish doesn't have a regular 40mm collar.

 

[ragpicker]

Brian, have you used any Ferguson 103 receivers yet?

I have set up three A103E boxes and they work well however the patch software is not as good as that on the A102E. On the A102E I am able to get all 28.8 channels in the clear whereas the A103E only clears the main channels. Can't understand why this is but suppose will have to await furthe patch updates.

 

[Archive4]

c) is correct

Funnily enough, Dishpointer never replied to my e-mail, whereas my south american indian friends admitted they knew nothing about pre-skew, but had the correct calculation!

 

[Huevos]

I have set up three A103E boxes and they work well however the patch software is not as good as that on the A102E. On the A102E I am able to get all 28.8 channels in the clear whereas the A103E only clears the main channels. Can't understand why this is but suppose will have to await furthe patch updates.

What do you mean "main channels".

 

[Pride Of Cucamonga]

A mini dish doesn't have a regular 40mm collar.

But hasn't the inbuilt skew been done since Astra 1A?

 

[Huevos]

But hasn't the inbuilt skew been done since Astra 1A?

Yes.

 

[Pride Of Cucamonga]

Yes.

Before minidishes

 

[PaulR]

This drip, drip, drip of information is like pulling teeth! Let's see if we can manage more than 4 words in a reply.