Page 1 of 2 12 LastLast
Results 1 to 20 of 24

Thread: Lnb Skew Settings For Foxtel In Sydney

  1. #1
    Junior Member
    Join Date
    Jun 2008
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    Reputation
    10

    Exclamation Lnb Skew Settings For Foxtel In Sydney

    Hi all,

    New member , frst post.

    I have recently re-aquired foxtel. i bought my home with an existing dish(seems original) i have confirmed it's foxtel although the lnb was damaged in hail storms so i went to hotchip and got a new sharp ku lnb.

    i neglectyed to take dfown the lnb skew setting priot to removal and with the new lnb i dont know what it should be on and which direction to turn the lnb as i am facing the dish! i have set it to 45 degrees turning the lnb to the left so the pointer is 7 notches to the right from centre.

    is this right? what should it be?

    do i need t re-align my dish or is it ok as it hasn't moved from original spot from day 1?


    appreciate any help

    John.

    reply to group or
    e_llusion82@hotmail.com



Look Here ->
  • #2
    Senior Member
    LeroyPatrol's Avatar
    Join Date
    Jan 2008
    Location
    N.E. Vic
    Posts
    16,229
    Thanks
    3,528
    Thanked 4,710 Times in 2,797 Posts
    Rep Power
    1669
    Reputation
    46551

    Default

    I don't know what it should be but start with the connector pointing to around 7 o'clock when looking into the dish. With your sat reciever on the signal strength screen, watch happens when you turn the lnb and adjust it for maximum signal and quality.
    While you are at it you could check to see if you dish is well aligned. While watch ing the signal strength screen push on the top, bottom, lhs and rhs of the dish to see if the signal goes up or down. If the signal goes up when you push then the dish needs to be adjusted in that direction a little. Keep doing this till you get your dish adjusted for best signal.
    Have fun,
    Leroy
    XCRUISER HDSR600HD twin sat and terrestrial receiver $OOS *
    XCRUISER HDSR385 Avant - sold out$OOS UltraPlus DVB-T and DVB-S2 tuners $49 Remotes $OOS

  • #3
    Senior Member mborkp's Avatar
    Join Date
    Feb 2008
    Posts
    1,121
    Thanks
    526
    Thanked 300 Times in 163 Posts
    Rep Power
    263
    Reputation
    1466

    Default

    Hi,
    should all kind of LNB be skew for C1? What about D2 (ex. B3). My signal goes around 80 and I think should be better than that ?

    Thanks,
    mbo

  • #4
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Cool All L N Bs need offset skew for Optus.

    Quote Originally Posted by mborkp View Post
    Hi,
    should all kind of LNB be skew for C1? What about D2 (ex. B3). My signal goes around 80 and I think should be better than that ?

    Thanks,
    mbo
    G'day Everyone,
    All current Optus Satellites have that preset skew of about +40 deg.
    When looking into dish, LNB needs to be turned clockwise from normal.
    With one exception. Some of the early Foxtel/Austar LNBs had that skew built in.
    On these you will see a molded arrow about 40 deg C/W from the normal setting.
    If you want to use one of these for other Sats, turn anti C/W until arrow is vertical.
    I've attempted to show this in followimg image.
    There is a bit of parallax error showing, but is 40 deg.
    These may be quite rare now, but be aware that it is still possible to find them.

    Kindest Regards, " The Druid ".


  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #5
    Junior Member
    Join Date
    Jun 2008
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    Reputation
    10

    Smile RE:lnb skew

    Thanks guys,

    I had a mate inside watching the signal screen (foxtel digital/pace box) and i tried all adjustments from dish vert/horiz to lnb degrees and even lnb seat(in or out) i mean the lnb position in the holder closer to dish out further away (1 inch variation).


    i found that i got a maximum 78dbu signal strength and a 3/4 signal quality. i hjave been watching foxtell on my old 65cm dish (paint peeling and all) with a new sharplnb $30 from hotchip and its good hasnt dropped out at all running YUV out into my av system via scart the yuv to my tv.

    i have found that all 65cm dishes in sydney due to the size of the recieving area usually get only approx 77dbi and if i push the lnb towards the dish i get stronger signal(aligns lnb to centre of dish) if i turn it anti clockwise i get bad/no signal but clockwise anything from 5 degrees to approx 60 degrees seems to be 76 - 78 dbi. works well for me well good enuf for euro soccer anyway.

    thanks for your help

  • #6
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Thumbs up Can only get better.

    Quote Originally Posted by MOSLAVINA View Post
    Thanks guys,

    I had a mate inside watching the signal screen (foxtel digital/pace box) and i tried all adjustments from dish vert/horiz to lnb degrees and even lnb seat(in or out) i mean the lnb position in the holder closer to dish out further away (1 inch variation).


    i found that i got a maximum 78dbu signal strength and a 3/4 signal quality. i hjave been watching foxtell on my old 65cm dish (paint peeling and all) with a new sharplnb $30 from hotchip and its good hasnt dropped out at all running YUV out into my av system via scart the yuv to my tv.

    i have found that all 65cm dishes in sydney due to the size of the recieving area usually get only approx 77dbi and if i push the lnb towards the dish i get stronger signal(aligns lnb to centre of dish) if i turn it anti clockwise i get bad/no signal but clockwise anything from 5 degrees to approx 60 degrees seems to be 76 - 78 dbi. works well for me well good enuf for euro soccer anyway.

    thanks for your help
    Absolutely fantastic what true fanatics will endure to watch their favorite sport.
    Kindest Regards, " The Druid ".

  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #7
    Senior Member mborkp's Avatar
    Join Date
    Feb 2008
    Posts
    1,121
    Thanks
    526
    Thanked 300 Times in 163 Posts
    Rep Power
    263
    Reputation
    1466

    Default

    Quote Originally Posted by beer4life View Post
    [COLOR="Blue"]G'day Everyone,
    All current Optus Satellites have that preset skew of about +40 deg.
    When looking into dish, LNB needs to be turned clockwise from normal.
    beer4life,
    thanks a lot for this important info!
    Will have to jump on my roof tommorow and use my new gadget to play with dish setup.
    Regards,
    mbo

  • #8
    Junior Member AfterHourZ's Avatar
    Join Date
    Jan 2008
    Posts
    61
    Thanks
    3
    Thanked 6 Times in 2 Posts
    Rep Power
    200
    Reputation
    42

    Default Angles & skews 4 Oz

    Take the hard work out of it all - learn nothing - have it handed to you on a plate.
    My good deed for the year




    AfterHourZ

    Dreambox Nut

  • #9
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Cool Correction.

    Quote Originally Posted by AfterHourZ View Post
    Take the hard work out of it all - learn nothing - have it handed to you on a plate.
    My good deed for the year




    AfterHourZ

    Dreambox Nut

    Sorry old chap,
    This satellite pointer, along with all others that I have seen, does not take into account the preset skew as mentioned above, of the Optus satellites.
    As this is substantial at +40 deg; it plays a major role in the set up.
    I would suggest that this is something that you may have now learnt.
    Kindest Regards, " The Druid ".

  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #10
    Senior Member mborkp's Avatar
    Join Date
    Feb 2008
    Posts
    1,121
    Thanks
    526
    Thanked 300 Times in 163 Posts
    Rep Power
    263
    Reputation
    1466

    Default

    Hi,
    would be 40deg skew also valid in Perth or it is different value here?

    Cheers,
    mbo

  • #11
    Member
    Join Date
    Jan 2008
    Location
    Super Duper Secret Members Forum
    Posts
    374
    Thanks
    0
    Thanked 2 Times in 2 Posts
    Rep Power
    0
    Reputation
    21

    Default

    I don't know about the skew angle or any of that stuff, but for a sharp LNB you turn it so the cable sticks out towards the east a bit and if you look at the notches in the top of the LNB the 3rd one from the end should line up with the middle of the LNB mount at the top.

    This is applicable for all optus satellites with sharp LNBs.

  • #12
    Senior Member Farmsky's Avatar
    Join Date
    Jan 2008
    Location
    Gloucester, NSW
    Posts
    964
    Thanks
    138
    Thanked 193 Times in 85 Posts
    Rep Power
    253
    Reputation
    1181

    Default

    Quote Originally Posted by beer4life View Post
    Sorry old chap,
    This satellite pointer, along with all others that I have seen, does not take into account the preset skew as mentioned above, of the Optus satellites.
    As this is substantial at +40 deg; it plays a major role in the set up.
    I would suggest that this is something that you may have now learnt.
    Kindest Regards, " The Druid ".
    Dear fellow,

    I'm not sure where you have 'learnt' your extremely limited and always misleading information on satellites ....... but you are ...... simply full of it!

    The '' guide posted earlier by After Hour Z is spot on; as you would expect from a major industry supplier like Hills.

    As I have explained elsewhere the Optus series satellites are tilted on their flight axis wrt other satellites. The actual tilt or variation from a standard skew is not 40 degrees. Rather it is 45 degrees.

    Stare up at the sky and imagine the Clarke Belt spreading in an arc from east to west. Imagine a point at the apex of the arc ie due north. Now a satellite here would normally be vertical. If it is an Optus satellite it is tilted 45 degrees to the left. That's what the Optus 'mystery' is about. Of course this put's it midway between vertical and horizontal if you are aligned for a 'normal skew' satellite.

    So the trick when using any dish pointing software is to simply 'add on' the special Optus skew (45 degrees).

    The correct skew setting for Sydney OPTUS C1 is +38 degrees which is where I suspect poor old beerforlife's 40 'Sydney centric' view comes from.

    But what does this mean?

    Looking into the dish (Sydney), the lnb is rotated 38 degrees clockwise from vertical. ie starting with the cable exit point down (6 o'clock). 38 degrees is a bit past 7 0'clock (30 degrees) which is the common reference we generally talk about for C1 in Sydney. The lnb's manufacture's tolerance may vary this a bit, even between like lnb's.

    The other main Optus birds will have slightly different skews in Sydney. e.g

    Optus D2 (152 E) Skew = 44 deg
    Optus C1 (156 E) Skew = 38 deg
    Optus D1 (160 E) Skew = 32 deg

    ..... But all still pretty close to 7 o'clock

    The following explanation will completely lose beerfor life; but bear with me.

    An excellent dish pointing skew calculator is available at . Have a look at this site and plug in various satellites and locations. You will notice how the skew changes with satellite and location. If you can get your head around it; this site and the nice graphics will also explain why the skew varies with satellite and location. It should also give you an insight as to why the skew is 'automatically adjusted' on a polar mount as you 'roll' around the Clarke Belt.

    However the Satlex site (and none of the web calculators that I know of apart from the published calculators like Hills), take into account the different Optus skew.

    So this is how you calculate it using a standard dish pointer.

    Satlex indicates +7.1 deg for Optus C1 in Sydney. So 7 - 45 = -38 degrees (or a bit past 7 0'clock). Which by the way matches the Hills chart.

    Note: +/- skew depends on how you look at the skew rotation. There does not appear to be a standard nomenclature here.

    So what about Perth?

    Satlex indicates +46 for Optus C1 in Perth. So 46 - 45 = 1 degree (or 6 o'clock). Which again perfectly matches the Hills chart.

    And if you want it from the horse's mouth, here is Optus's neat little skew chart for Optus C1 from the 'Optus Satellite Network Designers Guide'.



    And they provide them for all their orbital slots.

  • The Following 2 Users Say Thank You to Farmsky For This Useful Post:

    Mr Guppy (25-09-12),ozbing (16-07-11)

  • #13
    Member
    Join Date
    Jan 2008
    Location
    Sydney
    Posts
    275
    Thanks
    3
    Thanked 0 Times in 0 Posts
    Rep Power
    207
    Reputation
    10

    Default

    Farmsky,

    Very nicely written!!...

    Cheers

  • #14
    Senior Member
    LeroyPatrol's Avatar
    Join Date
    Jan 2008
    Location
    N.E. Vic
    Posts
    16,229
    Thanks
    3,528
    Thanked 4,710 Times in 2,797 Posts
    Rep Power
    1669
    Reputation
    46551

    Default

    I always enjoy your in depth responses to questions Farmsky.

    Leroy
    XCRUISER HDSR600HD twin sat and terrestrial receiver $OOS *
    XCRUISER HDSR385 Avant - sold out$OOS UltraPlus DVB-T and DVB-S2 tuners $49 Remotes $OOS

  • #15
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Talking What a load of self emollient twaddle.

    Quote Originally Posted by Farmsky View Post
    Dear fellow,

    I'm not sure where you have 'learnt' your extremely limited and always misleading information on satellites ....... but you are ...... simply full of it!
    ..................
    You've been itching to have a crack at me since I returned to the forum.
    You're expertise would be more constructive if used to help members rather than flame them with your convoluted diatribe.
    Your main gripe here is misquoting me about the Optus skew.
    I've used the nomenclature of Preset Skew for Optus Satellites. The figure of 40 Deg. came from an old LNB with a moulded arrow. Near enough to all intents and purposes.
    Now you are inventing nomenclature for figments of your imagination that I never said or intimated.
    The correct skew setting for Sydney OPTUS C1 is +38 degrees which is where I suspect poor old beerforlife's 40 'Sydney centric' view comes from.
    The preset skew is set with the dish pointing True North.There is a difference (Perth 4 W) and (Sydney 12 E) of 16 Degrees in "Magnetic Variation (Declination)".
    There are places on our planet exceeding + or - 45 Deg. Magnetic Variation.


    You do not have the faintest idea of Navigation.
    I, on the other hand have been a 'Licenced Navigator' for 58 years.
    To use any of the composite satellite charts for all sats, quoted skew must be taken into account as well as any "Preset Skew".



    May I humbly suggest, that instead of posturing as the only GURU on the forums, that you accept help from others as it is intended, and if necessary politely and diplomatically disagree or reinforce.

    Very Kindest Regards, " The Druid ".
    Last edited by beer4life; 12-06-08 at 06:42 PM.

  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #16
    Senior Member *fergs*'s Avatar
    Join Date
    Jan 2008
    Location
    Wait Awhile
    Posts
    672
    Thanks
    36
    Thanked 10 Times in 9 Posts
    Rep Power
    221
    Reputation
    54

    Default

    Quote Originally Posted by mborkp View Post
    Hi,
    would be 40deg skew also valid in Perth or it is different value here?

    Cheers,
    mbo
    On what satellite ??

    just got on the roof & looked @ my C1 & the cable exit from LNB is about 5 oclock...

    if thats any help... (acer lnb i think)

  • #17
    Senior Member Farmsky's Avatar
    Join Date
    Jan 2008
    Location
    Gloucester, NSW
    Posts
    964
    Thanks
    138
    Thanked 193 Times in 85 Posts
    Rep Power
    253
    Reputation
    1181

    Default

    I'll let others be the judge

  • #18
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Cool Clarification.

    Quote Originally Posted by *fergs* View Post
    On what satellite ??

    just got on the roof & looked @ my C1 & the cable exit from LNB is about 5 oclock...

    if thats any help... (acer lnb i think)
    The "Preset Skew", despite the 'red herrings' is set with the Mast plumb, the motor if used, central and the azimuth at North. North True, not Magnetic.If you follow others' description(7'0Clock for exit cable),(nearer 7.30 to be precise).
    The "Preset Skew" remains the same irrespective of your azimuth.
    Kindest Regards, " The Druid ".

  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #19
    Senior Member
    beer4life's Avatar
    Join Date
    Feb 2008
    Location
    The Nether World.
    Age
    90
    Posts
    6,375
    Thanks
    1,351
    Thanked 1,452 Times in 1,066 Posts
    Rep Power
    559
    Reputation
    7552

    Talking Oversight.

    G'Day,
    Sorry, did forget to mention that if you are mounting your dish on a "mountain of metal" like a 4 WD Patrol, then you will also have to allow for "Deviation."
    Kindest Regards, " The Druid ".
    Last edited by beer4life; 12-06-08 at 06:32 PM.

  • The Following User Says Thank You to beer4life For This Useful Post:

    toadskin (11-04-11)

  • #20
    Member
    Join Date
    Jan 2008
    Location
    Sydney
    Posts
    275
    Thanks
    3
    Thanked 0 Times in 0 Posts
    Rep Power
    207
    Reputation
    10

    Default

    Quote Originally Posted by beer4life View Post
    I, on the other hand have been a 'Licenced Navigator' for 58 years.
    WoW!... dude how old are you?

    Nevertheless, Always good to see experienced sharing their experience/knowledge

  • Page 1 of 2 12 LastLast

    Bookmarks

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •