This has made me remember that while i have become fairly proficient at manipulating the dish(azimuths,skew and the like),i don't know anything about fiddling with stb parameters like lnb frequency settings.So i do a simple google search and i get conflicting info-e.g
Congrats
lemmy morgan says the best ku settings are 950/10600 while another site says the universal ku settings is 10750.others talk of a certain calculation.which are the best ku band settings or does it depend on the sat?
LNBS got something called Local Oscillator or LO frequency. It's probably branded on the back of your lnb or it's packaging: This is the frequency that your lnb produces to help downconvert the satellite high frequency to a lower one which can be run down the coaxial cable to your box..
Normally they are two for an lnb; ku 9750 MHz and 10600 Mhz or 10750 depending on your LNB
Cband 5150 mhz and 5750 mhz
The higher LO frequencies for both C and Ku downcoverts the satellite frequency down to a range of between 1100 and 2150 mhz to be run down the coaxial cable.
The lower LO frequencies downconvert the satellite frequency to a range of between 950Mhz and 1950Mhz to be run down the cable.
These are the "Output frequencies" also probably branded on your LNB.
Just remember the higher the frequency you choose the higher the frequency that'll be coming down your cable and can your cable and switches handle it?
Now if you've got a good quality coaxial cable that can handle both high and low frequencies with minimal attenuation you shouldn't see any difference when you choose different LO settings at LNB setup.. (personally I don't)
But most china coaxial cables perform poorly at higher frequencies so if you choose 10600Mhz for ku or 5750 for C , the frequency output of the LnB will be higher that is 1100 to 2150Mhz and you may suffer higher signal loss between the LNB and your decoder.
Actually theoretically, a higher lnb output frequency the better because when converting for example 12500 mhz sat freq to 2150Mhz less noise is generated compared to when converting it to a lower frequency eg 950Mhz. Thus more stable signal But the catch is, is your cable capable of handling higher frequencies?
You'll be safer with 9750 ku and 5150C which downconverts to lower range output frequencies if you've got bad cables
Also always check the frequency range rating for your cables often printed in their cover. Genuine Astel cables are the best.
This also goes to other peripherals between lnb and decoder like switches and splitters. They've got a frequency range rating and some are just bad.
can the gurus like vicwa,giden,freq et al help out a brother on this?
That's what am doing 😅
As an stb user,am I supposed to tinker with the LNB settings every time i scan for channels on a part TC Dricular sat?
No you don't always need to.. modern recievers are smart enough to figure out certain things for themselves.. like 22Khz tone selection and 18/13 V power on or off can be done automatically. Just set them to "auto"
However certain stuff like LnB frequency must be selected by user. It'll depend on whether you're using a C or Ku LnB. And if you're using disceq switch you must select the exact port your lnb is hooked up to and select whether you're using disceq 1.1 or 1.0 type of switch.
pia kuna other things naonanga(bila kugusa) kama tone burst (A,B,none),LNB power(on/off),22khz(auto/ off).Hizi nazo ni za nini?Of course in an ideal world this info would be provided by a user manual but my chinco decoder came with a broken-english, half-page manual😬😬.
22 khz tone burst is an automatic "Switch" for the LO frequency when put on, the decorder will send a 22khz signal to your lnb to switch to the higher Local oscillator frequency that is 10600 for ku and 5750 for C. That is if your lnb settings is 5150/5750 for C and "Universal" for Ku. You can leave this setting at "auto" so the box can do whatever it deems best with it
Or put it off if your cable is chinku and perform poorly at higher frequencies.
LnB power is either 13 V or 18V. It helps the lnb switch between Horizontal and Vertical polarities. The lnb is designed such that if it receives around 13V volts, it will activate the horizontally oriented antenna, if it receives 18V power from the decoder, it will engage the Vertically oriented antenna. (There are two small antennae within the lnb protruding from the wall)
Again leave this setting at "auto" so the box can do with it whatever it wants.