Thanks. Since I am new it will be a while going thru some docs to understand what gnu can do …
Re: your last answer, what is the difference between analog RF vs analog video? I understand analog video might just mean composite video “baseband.”
What I meant was RF transmission of analog video broadcast channels, the kind sent out by cable TV headends over coax to homes with “regular” TV sets with an RF port on back. This is still the majority situation globally.
My understanding is (please correct with your expertise; I am learning):
The original satellite transponder signal is received by “professional” IRDs which are basically overpriced DVB-S2 satellite receivers ($10 each in quantity online with single DVB-S2 tuners and CVBS/HDMI outputs plus USB port(s) and power adapters, remote control, cables etc.)
From Alibaba, if you add up the costs for transmitting 96 analog RF channels, with TS stream inputs ( derived from commodity satellite receiver STB motherboards after the LNB tuner-demodulator stages), and add up costs for multiple 16-24 channel decoders ( converting TS input to individual CVBS channels after D/A stage) and 16-24 channel matching RF modulators ( converting CVBS channels input to single stream RF output via combiner ports), they come to about $40/TV channel.
Of course in the above traditional setup there is a lot of redundant conversion with unnecessary physical ports that drive up the price.
From the 60Mhz/ 100 Mbps estimate, it looks one might cover about 60 TV channels with a single LimeSDR unit. (6-8 Mhz “analog” bandwidth satellite transponder mux carrying 6-8 digital TV channels, each of which is then converted to an analog equivalent channel.) Satellite transponder bandwidth is single carrier 27-72 MHz, with “average” 27-32 Mhz.
In principle then each satellite DVB-S2 STB receiver gets this 27-32 MHz bandwidth as a TS stream post tuner-demodulator stages, but only decodes a single digital TV channel as analog CVBS or digital HDMI output. So each STB tunes-demods about 30 digital channels at once.