Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

RTE Announce FTA Saorsat service

1…2021232526…62

Comments

  • #1102
    Tony
    Registered Users, Registered Users 2 Posts: 11,336 ✭✭✭✭Tony


    Thats very true they do get more exposure.

    I dont think your post was a mistake just a different viewpoint and I hope you did not think my reply was "having a go", that was not my intention.

    Chuck Stone wrote: »
    No evidence at all - can't remember where the idea came from. I guess RTE get more exposure for their advertisements and that's why they let it be carried.

    Never mind, my mistake. Thanks for replies.

    Desktop PC Boards discount code on https://www.satellite.ie/ is boards.ie



  • #1103
    Chuck Stone
    Closed Accounts Posts: 13,030 ✭✭✭✭Chuck Stone


    Tony wrote: »
    Thats very true they do get more exposure.

    I dont think your post was a mistake just a different viewpoint and I hope you did not think my reply was "having a go", that was not my intention.


    Not at all. No worries.


  • #1104
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    Chances are whoever wrote the 'Saorsat' wikipedia entry hails from this parish.

    http://en.wikipedia.org/wiki/Saorsat

    Perhaps the 'Soarsat' and 'Soarview' misspellings might be corrected?

    "RTÉ has not indicated which satellite or satellite orbital position Saorsat will broadcast from."

    Strictly true, but Eutelsat have already confirmed it's Ka-Sat as reported by The Cush.


  • #1105
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    Anyone can edit Wiki

    I fixed the speeelinks. No idea who mistyped.

    RTE refused (even in person) to categorically publically admit it's Ka-Sat. But of course it is.

    We can fix the entry when we get the first test signal.

    There could be other mistakes still.


  • #1106
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    Given the amount of unsubstantiated supposition in the article (e.g. "dedicated spotbeam" - just one? "Saorsat is expected to be a copy of Saorview" - expected by whom?), it's odd that there is no mention of the only satellite on which the service could possibly be accomodated in the indicated timeframe. It's doubly odd when the owner of the satellite has already confirmed this in press.


  • #1107
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    See what it says now :)

    RTE has said it's a fill in and also a DTT site backup feed. That implies a Transport Stream copy using DVB-S2 modulation. Possibly even two carriers on the transponder. (Real transponders are often much larger than the Lyngsat "listed" transponder, which is often one of several carriers on same physical transponder).


  • #1108
    Tony
    Registered Users, Registered Users 2 Posts: 11,336 ✭✭✭✭Tony


    A great many people I speak to are calling it Soar sat for some reason?

    Desktop PC Boards discount code on https://www.satellite.ie/ is boards.ie



  • #1109
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    watty wrote: »
    See what it says now :)

    RTE has said it's a fill in and also a DTT site backup feed. That implies a Transport Stream copy using DVB-S2 modulation. Possibly even two carriers on the transponder.

    I can't recall them using the phrase "site backup feed"?

    It may well be a TS copy, but there is currently no evidence to support that. There is also the outstanding issue of whether TV3/3e will be carried on Saorsat, especially when TV3 have been so contrary so far in their attitude to Saorview.


  • #1110
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    Slightly OT ...

    The "other" Ka-Band satellite that was launched late last year, Hylas-1, is now ready to enter service following the completion of in-orbit testing.
    Hylas-1 ready for business
    By Chris Forrester

    Hylas-1, the UK’s latest satellite, is ready to do business. Astrium, which built the ‘highly adaptable satellite’ says it will hand over the orbiting satellite to Avanti Communications next week having completed its in-orbit testing of the craft.

    Hylas-1 was launched back in November. “In recent months HYLAS 1 has undergone a series of tests to verify and validate the performance of its flexible payload, which is designed to allocate varying amounts of power and bandwidth to the different regions within its footprint, reacting to the highs and lows of traffic demand.”

    ...

    http://www.advanced-television.com/index.php/2011/03/17/hylas-1-ready-for-business/

    and a mention for Ka-Sat
    and also the massive Ka-Sat craft from Eutelsat which is now undergoing its final in-orbit tests.

    And as we begin to get our head around Ka-Band technology, others are thinking beyond that to Q-band (30GHz to 50GHz) and even V-band (50GHz to 75GHz)
    Meanwhile, satellite companies will continue to gain aggregate capacity by engaging the higher microwave frequencies, as well as by dividing their footprint into larger numbers of beam areas. Higher frequencies increase data transmission rate, with another advantage in the case of satellite being smaller beam size, reducing the antenna dimensions. But again, like wired transmission, high-frequency transmission requires more sophisticated electronics at either end. In the case of satellite, signals at higher frequencies need more accurate antennas to cope with the smaller spot size and additional signal processing to cope with greater susceptibility to signal fading in heavy rain.

    But the challenges are being solved, and Ka-band in the range of 26.5GHz to 40GHz is being investigated for both local video distribution and wider contribution. In the future, even higher bands will be used, such as Q-band in the range of 30GHz to 50GHz and even V-band at 50GHz to 75GHz. Indeed, the Alphasat I-XL satellite to be operated by Inmarsat and due for launch in 2012 will experiment with transmission in the Q- and V-bands.

    These new bands will enable satellites to expand their services in emerging markets, particularly the maritime areas around Europe, where the density of both merchant and passenger shipping is greater than elsewhere. Here, for example, Telenor Satellite Broadcasting has recently decided to launch a new satellite to serve the busy shipping lanes of the North Sea, the Baltic area and the Mediterranean with services in the Ka-band.

    The future, then, for satellite is bringing a declining proportion of broadband and video communications in more densely populated areas, but increasingly serving areas where wires cannot reach, including for newsgathering and maritime services as well as fast-growing markets outside the video sphere, such as in machine-to-machine communications.

    http://broadcastengineering.com/news/satellite-operators-target-emerging-markets-make-up-lost-revenue-20110307/


  • Advertisement
  • #1111
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    Apogee wrote: »
    I can't recall them using the phrase "site backup feed"?

    It may well be a TS copy, but there is currently no evidence to support that. There is also the outstanding issue of whether TV3/3e will be carried on Saorsat, especially when TV3 have been so contrary so far in their attitude to Saorview.

    Definite on the Backup feed for sites. There is no evidence that Saorsat is a separate charge. It's definitely not a Freesat/Freeview scenario. The Saorsat just a very tall mast for Saorview to fill in missing coverage.

    I'd not pay any mind to TV3 or the Newspapers. At the end of the day there is nothing stopping TV3 ignoring BAI and DTT and analogue and being a pay TV station only. They will make that decision purely on revenue vs costs.

    I'm in the peculiar situation too where some things I know must be true, RTE won't confirm, and other things have been confirmed officially but I can't publicise them, or also some perhaps stretch my credulity...

    Another 3 months or so and we will know more.

    It seems too that RTE are being cautious about EIRP/Dish Size and N.I. Coverage until real on the ground signal tests have been done.

    I guess maybe Intelsat 907 is part of reason. Lovely Ireland and UK footprint. But apparently the power levels are hopelessly optimistic.

    Also there is the issue of Uplink power and location, I don't fully understand that on Ka-Sat as there are no published details of interspot muliplexing.


  • #1112
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    There is equally no evidence that Saorsat isn't a separate charge.

    It's a matter of language regarding DTT backup imho - one thing to state "it is probable that Saorsat will be a copy of Saorview" as opposed to "it is expected that Saorsat will be a copy of Saorview".


  • #1113
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    watty wrote: »
    There is no evidence that Saorsat is a separate charge.
    Apogee wrote: »
    There is equally no evidence that Saorsat isn't a separate charge.

    Discussed with watty previously. :D
    Deputy Liz McManus: What will that provision cost RTE?

    Mr. Conor Hayes: A limited amount, which is detailed in the document we have supplied the committee. It will cost us approximately €1.5 million per year. We can manage it. As other channels come on board, part of the cost will be defrayed.


  • #1114
    mark_79
    Banned (with Prison Access) Posts: 153 ✭✭mark_79


    I have practically zero interest in RTE programming or anything associated with it however I am interested in knowing if this Saorsat (or whatever its called) service will be viewable through Sky set top boxes?

    If not does that mean RTE channels will be dropped from the Sky boxes when the switch over takes place?


  • #1115
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    It's nothing to do with Sky or UPC.

    Neither Saorsat or Saorview can be received on Sky or UPC, ever.

    Existing Irish Channels on Sky and UPC are not affected. It's up to Sky & UPC if they want to carry the new Services on Saorview.


  • #1116
    homelink
    Registered Users, Registered Users 2 Posts: 138 ✭✭homelink


    Does anyone know when the test broadcasts for Saorsat will begin?
    Also where can you pick up a KA lnb.


  • Advertisement
  • #1117
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    1) No. Probably not more than than a handful even in RTE. They are secretive to own staff.

    2) You can only get flange/waveguide kind. You'd need to make / buy a horn. Wait till you hear more.


  • #1118
    homelink
    Registered Users, Registered Users 2 Posts: 138 ✭✭homelink


    watty wrote: »
    1) No. Probably not more than than a handful even in RTE. They are secretive to own staff.

    2) You can only get flange/waveguide kind. You'd need to make / buy a horn. Wait till you hear more.

    Thanks for that.


  • #1119
    getcover
    Registered Users Posts: 264 ✭✭getcover


    Sorry if this has been asked before, but will the RTE digital service be avaialable through the aerial only, it won't be on any satellite?

    another way of asking the question is will it be FTA on Astra 28 by any chance?


  • #1120
    dowtchaboy
    Registered Users, Registered Users 2 Posts: 1,498 ✭✭✭dowtchaboy


    getcover wrote: »
    Sorry if this has been asked before, but will the RTE digital service be available through the aerial only, it won't be on any satellite?
    Polite answer: The RTE digital services will be on both terrestrial aerial and satellite. There may be some differences in what is available on Saorview (over the aerial) and Saorsat (via a satellite dish) - we just don't know for sure yet.
    another way of asking the question is will it be FTA on Astra 28 by any chance?
    No - the service will come from a just launched satellite on a different frequency & LNB to yer normal Sky or anyone else. We don't know if Sky will continue to carry RTE etc. on their EPG - they might. It does seem very unlikely that the Irish channels will ever go FTA (ie unencrypted) on any of the broad coverage Astra satellites as this would involve RTE and TV3 in paying much higher copyright fees - the Saorsat coverage is much much tighter - really only covers the island of ireland.

    The www.saorview.ie site has a lot of infor as do the stickies at the top of this forum and the Boards.ie terrestrial forum.
    Also if you do a search for "watty" you will find one or two posts about it.....:)


  • #1121
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    sky will continue to carry what they carry and have option to carry more later.

    Saorsat is supposed to just be fill-in and backup of Saorview, not a separate service like Freeview and Freesat.

    www.saorview.ie

    www.saortv.info


  • Advertisement
  • #1122
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    ISAA reported possible activity on Ka-sat here. So had a look this evening, with Ka-LNB mounted offset to Ku-band.

    lnbka.jpg

    I think this is 13E:
    13escan.jpg

    And if you go a few degrees west, get much stronger TPs - 9E?
    9escan.jpg

    The 3 TPs are IF 1439MHz, 1364MHz, 1117MHz. Assuming LO of 18750MHz, corresponds to 20189MHz, 20114MHz, 19867MHz.

    Unfortunately, I don't have a DVB-S2 blindscanner :(


  • #1123
    Sam Russell
    Moderators, Science, Health & Environment Moderators Posts: 19,862 Mod ✭✭✭✭Sam Russell


    Apogee wrote: »



    Unfortunately, I don't have a DVB-S2 blindscanner :(

    I do. Where are you based?


  • #1124
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    I 'borrowed' the Uncle's Argus Mini 2-in-1 which is supposed to have blindscan.

    It picked up at frequency at 11185MHz, SR 24995 which corresponds to one of TPs - 11185-9750 = 1435 MHz. Scan failed unfortunately. Signal may be a bit low, or the carrier might still be blank.


  • #1125
    Souriau
    Registered Users, Registered Users 2 Posts: 788 ✭✭✭Souriau


    Would a TBS DVB-S2 PCI card for the PC will work for SaorSat?
    http://www.tbsdtv.com/english/product/8921.html

    TIA.


  • #1126
    12 element
    Registered Users, Registered Users 2 Posts: 719 ✭✭✭12 element


    Souriau wrote: »
    Would a TBS DVB-S2 PCI card for the PC will work for SaorSat?
    http://www.tbsdtv.com/english/product/8921.html

    TIA.

    I'd say it's likely that it will with the right LNB and dish.


  • #1127
    LordSutch
    Closed Accounts Posts: 12,078 ✭✭✭✭LordSutch


    Saorview Question (apologies if this has already been tackled).

    I have a three year old Samsung 32" LCD (Mpeg 2) TV and I wish to receive Saorview using my roof top aerial in conjunction with the DVB slot on the back of my TV. So, can this be acheived by inserting the Mpeg 4 card, or do I also need a 'Saorview' set top box to convert my aerial signal?


  • #1128
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    LordSutch wrote: »
    So, can this be acheived by inserting the Mpeg 4 card, or do I also need a 'Saorview' set top box to convert my aerial signal?

    Wrong thread and wrong forum. Try here for Saorview info.


    Short answer: MPEG4 modules useless for HD services - get a box.


  • #1129
    Mr. Rabbit
    Registered Users Posts: 778 ✭✭✭Mr. Rabbit


    What's the current state of play with Saorsat ?

    Are they currently testing ? When do they hope to have the service up and running ?


  • #1130
    PressTheButton
    Registered Users Posts: 312 ✭✭PressTheButton


    The Cush has posted information on that subject HERE.
    The satellite network (Saorsat) is being developed to reach the remaining 2% of the population and will be available in the second half of 2011.
    - from Dept of Communications Ministerial Brief that Pat Rabbitte received when he became Minister.


  • #1131
    PressTheButton
    Registered Users Posts: 312 ✭✭PressTheButton


    Mr. Rabbit wrote: »
    What's the current state of play with Saorsat ?

    Are they currently testing ? When do they hope to have the service up and running ?
    Have you not been reading your Ministerial briefs, Pat (alias Mr. Rabbit)? ;)


  • Advertisement
  • #1132
    Mr. Rabbit
    Registered Users Posts: 778 ✭✭✭Mr. Rabbit


    The satellite network (Saorsat) is being developed to reach the remaining 2% of the population and will be available in the second half of 2011.

    Still doesn't tell me what's currently happening though. The second half of 2011 is surely a bit vague ? Any time after mid June then ? Or maybe as late as Christmas ? Is anyone in the anorak faternity currently receiving any signals ?
    Have you not been reading your Ministerial briefs, Pat (alias Mr. Rabbit)? wink.gif

    Hey, but I'm a singer, (i.e. Eddie Rabbit) not an Irish Politician, so I'm not really au fait with these things. :D


  • #1133
    rob the satman
    Closed Accounts Posts: 102 ✭✭rob the satman


    Not Roger Rabbit then:D:D


  • #1134
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    Mr. Rabbit wrote: »
    What's the current state of play with Saorsat ?

    Are they currently testing ? When do they hope to have the service up and running ?
    Mr. Rabbit wrote: »
    Still doesn't tell me what's currently happening though. The second half of 2011 is surely a bit vague ? Any time after mid June then ? Or maybe as late as Christmas ? Is anyone in the anorak faternity currently receiving any signals ?

    Latest semi-official information from a Saorview trade event a few weeks ago (discussion starts here).

    Basically RTÉ are saying nothing about Saorsat right now.
    scaller wrote: »
    On the topic of Saorsat it is not certain whether this system will work or not as Des said this only at trial at the moment he didn't seem to want to talk about it.
    Deleted User wrote: »
    They are testing saorSAT at the moment they said, but could offer no information on it or wheter it would work even.It's all that new to them.
    scaller wrote: »
    And Des said that at the moment he is not going to discuss saorsat.
    scaller wrote: »
    He wasn't very forthcoming on the subject of Saorsat.

    Latest official information
    RTÉNL expect to be able to make more information publicly available about this new service in late 2011.

    http://www.saorview.ie/what-is-saorview/saorsat/
    Mr. Rabbit wrote: »
    Is anyone in the anorak faternity currently receiving any signals ?

    See post #1122 on the previous page


  • #1135
    Mr. Rabbit
    Registered Users Posts: 778 ✭✭✭Mr. Rabbit


    Thanks for the info. cush.

    Looks like we'll have to wait a wee while longer !


  • #1136
    Joe7
    Closed Accounts Posts: 74 ✭✭Joe7


    rob the satman wrote: »
    Not Roger Rabbit then

    Peter Rabbit, more like . . .


  • #1137
    Mr. Rabbit
    Registered Users Posts: 778 ✭✭✭Mr. Rabbit


    Nor Pat :D:D:D


  • #1138
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    Three Criteria Test on the Broadcasting Transmissions Market

    Submissions:
    http://www.comreg.ie/publications/consultation_submissions_-_three_criteria_test_on_the_broadcasting_transmissions_market.583.103838.p.html

    Response:
    http://www.comreg.ie/publications/response_to_consultation_-_three_criteria_test_on_the_broadcasting_transmission_market.583.103837.p.html

    It's remarkable that McCarthy didn't recommend abolishing this useless bloody talking shop and having its functions absorbed back into the Dept. Anyway, couple of references to Saorsat in the submissions:
    RT&#201 wrote:
    Q. 2. Do you agree with ComReg’s draft finding that the retail pay TV (cable and satellite) and free to air terrestrial TV services, which are national in scope, are not in the same retail market? Please explain your answer and provide evidence where available.

    RTÉ does not agree, and points to the take-up by circa 10% of the Irish population of the UK Free Satellite service, thereby proving that the free-to-air and Pay TV markets are becoming indistinguishable. The advent of Irish DTT and the existence of combination-receivers which can receive both terrestrial Irish DTT and free-to-air UK satellite services further underlines this development. In addition, the Consultation document refers to SAORSAT, the proposed free-to-air Irish satellite service, on pages 23 and 24, and RTÉ contends that given the variety of free-to-air services coming into the Irish market that the market could be expected to tend towards the inclusion of both pay TV and free-to-air over time.
    RT&#201 wrote:
    Finally, RTÉ cannot agree with the expressed view on page 42 that despite the proposed free-to-air digital satellite service (SAORSAT) that ‘it is unlikely that households could adjust their dishes.’ Therefore, RTÉ and RTÉNL do not agree that the second criterion is satisfied in the Irish national terrestrial broadcasting market.
    TV3 Gobdaws wrote:
    RTÉ’s proposed Saorsat platform, whilst meeting the need to reach the “final 2%” of Irish homes, does present the end user with an expensive alternative to free-to-air reception (currently estimated at €375). End users would have to purchase set-top boxes capable of receiving the Ka band. Promotion by the state broadcaster of hybrid boxes capable of Ka and Ku band signals, at what is likely a higher price, present possible state aid issues regarding the promotion of a competing satellite platform capable of receiving non-Irish channels, that currently exist “in the clear”.


  • #1139
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    FWIW I check Ka-sat again over w/e and the signal at 1439MHz was gone (bottom most peak on previous photo). This was the peak which was detected by the blindscan receiver.


  • #1140
    Pangea
    Registered Users, Registered Users 2 Posts: 5,565 ✭✭✭Pangea


    More information by late 2011?
    Thats disappointing ,first they said saorsat would be running in the 2nd Quarter of 2011, big difference.


  • Advertisement
  • #1141
    STB
    Closed Accounts Posts: 5,178 ✭✭✭STB


    That doent mean it wont be available to anoraks before then!

    Profesionally it wont be available for test till the end of this month anyway. And that includes other users such as Satellite Broadband Ireland.


  • #1142
    SandieBeach
    Registered Users Posts: 2 ✭SandieBeach


    When will a suitable LNB be available? And at what sort of price?


  • #1143
    PressTheButton
    Registered Users Posts: 312 ✭✭PressTheButton


    STB wrote: »
    That doent mean it wont be available to anoraks before then!

    Apparently one anorak in east Cork is already picking it up and selling the necessary hardware on Adverts:

    http://www.adverts.ie/591937

    According to the seller:
    ...and yes you can get SoarSat in east cork.

    Hmmmmm! :confused:


  • #1144
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    PressTheButton wrote: »
    Apparently one anorak in east Cork is already picking it up and selling the necessary hardware on Adverts:

    http://www.adverts.ie/591937

    According to the seller:

    Hmmmmm! :confused:

    That's Selfsat (Ku Band) not Saorsat (Ka Band)


  • #1145
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    SandieBeach wrote: »
    When will a suitable LNB be available? And at what sort of price?

    No information yet. Later in 2011.


  • #1146
    PressTheButton
    Registered Users Posts: 312 ✭✭PressTheButton


    Ku versus Ka:
    Have asked seller nopzdk on http://www.adverts.ie/591937 to correct information he gave to interested buyer.


  • Advertisement
  • #1147
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    PressTheButton wrote: »
    Ku versus Ka:
    Have asked seller nopzdk on http://www.adverts.ie/591937 to correct information he gave to interested buyer.

    Those are rubbish for Ireland. It's only equivalent to a 40 to 42cm. The Ku LNB is integrated and can't be swapped.

    No use for Ku in Ireland (except in perfect weather) and will never ever work on Ka band.


  • #1148
    Minstrel27
    Closed Accounts Posts: 7,818 ✭✭✭Minstrel27


    http://www.lyngsat.com/eka.html

    RTÉ services now apparently available. Anyone able to try it?


  • #1149
    The Cush
    Registered Users, Registered Users 2 Posts: 15,636 ✭✭✭✭The Cush


    Minstrel27 wrote: »
    http://www.lyngsat.com/eka.html

    RTÉ services now apparently available. Anyone able to try it?

    No TV3/3e I see.

    Frequency is 20185 with L circular polarisation. What are the pros and cons of circular polarisation over linear?
    xnvubd.jpg


  • #1150
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    Minstrel27 wrote: »
    http://www.lyngsat.com/eka.html

    RTÉ services now apparently available. Anyone able to try it?

    Bualadh bos to C Putney whoever he is. The TP parameters (20185MHz, SR 25000) he reports pretty much correspond to the signal the blindscanner picked up (1435MHz [+ LO 18750MHz = 20185 MHz], SR 24995 ) but it failed to lock.

    It's the second strongest peak on the spectrum, which temporarily disappeared but then re-appeared again.

    9escan.jpg

    Will give it a lash again, but the weather is awful. Rain not good for Ka-band.

    [edit] I was scratching my head wondering why the signal remained on the scanner when I rotated the LNB through 90 degrees. Which makes perfect sense if it's circular polarisation. We'd assumed all along it was linear polarisation - similar to Hotbird.

    Ka-sat layout:
    hb6-ka-freq.png

    Hotbird layout:
    tooway-ka-band-frequency-plan.gif


  • #1151
    Apogee
    Registered Users, Registered Users 2 Posts: 3,802 ✭✭✭Apogee


    The Cush wrote: »
    No TV3/3e I see.

    Frequency is 20185 with L circular polarisation. What are the pros and cons of circular polarisation over linear?

    Originally CP was used because the satellites were not in geostationary orbit, so by using CP, rather than LP, eliminated the requirement to have to continually adjust skew at the receive sight.

    Probably more relevant to Ka-band, is that rain can 'scatter' the signal by affecting the linear polarisation orientation. No such issue with CP.

    You also have the problem of Faraday Rotation which is the rotation of polarisation caused by the earth's magnetic field or magnetic storms. So if your dish is pointed at extreme east (e.g. 1 deg elevation) the earth's field can twist linearly polarised signals, such that the Horiztonal and Vertical signals all appear on your spectrum analyser simultaneously. The issue with magnetic storms explains why CP C-band signals were often used in the USA in particular in the past.


  • Advertisement
This discussion has been closed.
Advertisement