FTA reception

[mpj111]

I want to know about FTA sat digital receiver configaration.

what is 22khz option, it can be on or off. What is the function of it.

TP- (transponder freq)- what is the meaning or function of it.

TP frq-12483, S/R =22500.
Is this sat transmission freq.

If this is transmission freq what is LNB frq (which is set to 11300).

Could any one explain this configaration in more technical details highly appreciated.

Many thanks in advance

[BGonaSTICK]

Hi mpj111

To a certain extent it depends on your LNB type, but for 'Universal' LNBs sold in Europe for Horizontal and Vertical polarisation at Ku band, the 22kHz tone is used to switch the LNB from low to high band and back.

The two bands exist because of historical decisions over bandwidth allocation, and are 10.7 - 11.7 GHz and 11.7 - 12.7 GHz. 11.7 GHz is the switchover frequency, and this is often specified as a parameter in the LNB configuration menus of receivers.

The transponder frequencies you mention are just that - the frequency of the carrier wave upon which the digital data is overlaid. Each satellite has multiple transponders, and the operating frequencies are spaced so as to not cause interference with each other. They also employ (often) alternating polarisations for adjacent frequencies to minimise problems in this regard.

LNBs basically step down these 10 - 12 GHz signals by use of an internal reference frequency known as a Local Oscillator frequency. In fact they use two - one for low band and one for high band, and you will often see these figures in the LNB configuration menu in case they were ever to change in the future.

For more explanation of the various terms used in DTH satellite, such as SR, FEC etc. please refer to our Glossary.

Hope this helps.

STICK

[mpj111]

thank you verymuch, I got the idea.