really high sr number

Discussion in 'Free To Air (FTA) Discussion' started by danristheman, Apr 13, 2019.

  1. danristheman

    danristheman Topic Starter SatelliteGuys Pro

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    Here is a pic of 91,93 west.
     

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  2. spongella

    spongella SatelliteGuys Pro
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    I've also seen symbol rates as low as a few thousand. What is the significance of symbol rates anyway? Picture quality, type of signal (e.g. video vs. data), cost in $? I know this is the best place for an answer.
     
  3. comfortably_numb

    comfortably_numb Dogs have owners, cats have staff
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    So is it on 91or 93?
     
  4. danristheman

    danristheman Topic Starter SatelliteGuys Pro

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    93w i had move the dish to the west to get 101w c band.
     
  5. primestar31

    primestar31 SatelliteGuys Master

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    The average FTA receiver maxes out at 45,000. The Edision OS Mio can go up to 60,000.
     
  6. Brct203

    Brct203 SatelliteGuys Pro

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    the symbol rate is a measure of the dataflow rate, at the modulation level. The higher the SR, the more data is being transmitted per second. It can correlate with picture quality, but not always. let's take a 20000 SR transponder on 97W, that sometimes carries 20 channels, those channels all have to share that data rate, so there's not much for each of them. Complicating this is the fact that they might not all get the same share. Just looks at the lousy quality on some channels on 97W, it's clear they are running on very low bitrate. Now look at PBS on 125W, a 30000 KS/s transponder carries only 3 HD channels and 3 SD channels, with a bit of room left for occasional feeds. Each channel gets a good share of the data rate, and gets a good picture (with more allocated to the HD channels as there's a lot more data needed).

    An analogy would be a garden hose that feeds some sprinklers. Supposing that the pressure is constant and the faucet can deliver as much water as needed, the bigger the hose diameter, the more water you'll get. Then you can have all the water going to one big sprinkler, or you can spread out the flow among many sprinklers, which would then get less water than the single one.

    the highest rate my Amiko has detected is about 65,000 kS/s, but could not lock on it. It was either on 63 W or 81W, I don't remember. I routinely get the 45,000 kS/s transponders on 34.5W Ku, as well as on 15W Ku. At the other end of the range, I can lock on the Chinese radio TP on 45W Ku, which is 900 kS/s. I had to enter it manually as 1000 kS/s though, as the Amiko would not allow anything below 1000. Also I find that many receivers are not so good at blindscans of transponders below 2000. They will find some of them and miss others.
     
  7. Cham

    Cham VE4GLS
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    Symbol rate indicates the reletive bandwidth of the signal, much like data rate. The higher the symbol rate the more data can be sent, and the wider the signal in the RF spectrum (the more space the signal takes up). A signal with a symbol rate at 600 is very narrow compared to one at 40,000, which would take up a more significant part of the downlink band in comparison.
    (ok I have a sore back and meds might be affecting me... :))
    Oops already answered... guess I type too slow...
     
  8. comfortably_numb

    comfortably_numb Dogs have owners, cats have staff
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    So did anybody find out what that feed is (or was)?
     
  9. Scott Greczkowski

    Scott Greczkowski Scanning the Skies!
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    I believe it was an 8K feed by NHK for the NAB event in Las Vegas.


    Sent from my iPhone using the SatelliteGuys app!
     
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  10. kofi123

    kofi123 SatelliteGuys Guru

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    This is some kind of data feed on Galaxy 3C at 95.1 W. To have such a high symbol rate requires a 54 MHz transponder, and Galaxy 3C is the only satellite nearby with a 54 MHz transponder around 11936V (transponder 30K).
     
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  11. Cham

    Cham VE4GLS
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  12. comfortably_numb

    comfortably_numb Dogs have owners, cats have staff
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    No thanks. A regular old dumb TV at 1080p works just fine for my needs. All of these marketing gimmicks to sell TV's are getting old. It's 2019 and there is still relatively little in 4K but now they're talking about 8K? :coco
     
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  13. Magic Static

    Magic Static FTA Geek
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    Reminds me of back when 4 track tape players came out. They were soon replaced with 8 track players. ;)
     
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  14. raydio

    raydio K4ECP
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    Or Betamax Vs VHS? Wow Magic we are really dating ourselves -

    Oh wait...remember video discs?
     
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  15. Cham

    Cham VE4GLS
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    Still use a CRT in the shack here where I spend a lot of time...
     
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  16. Brct203

    Brct203 SatelliteGuys Pro

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    well yes... 16K is much better...
    Sony creates colossal 16K screen

    But seriously, those resolutions are only as good as the signal quality that feeds them. I'd rather watch a high-bitrate SD than a cheap low-bitrate HD picture

    I was wondering if anyone had checked the 4K version of Love Nature on 43W C-band and could comment... The HD version picture quality is not impressive on anything that moves, it gets blurry and pixelated
     
  17. N5XZS

    N5XZS SatelliteGuys Pro

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    I remembered they say Betamax tape are better than VHS on picture quality!:biggrin:bow
     
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  18. JFOK

    JFOK SatelliteGuys Pro

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    N5XZS,

    Betamax did have the better picture quality. I still have one, but it doesn't see much use now a days.

    John
     
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