Hacktv: analogue tv transmitter

now all we need to do is send a hack rf to space and use it as a analog satellite :-rofl2
 
Given the puny output power, it's likely your only viewers would be at Jodrell Bank or Goonhilly. And I bet even they would struggle.
I believe even the current generation of broadcast satellites could be used for analogue, if someone is willing to hire a transponder :-)
 
Do you know how much an analog transponder cost
 
From a NASA doc: "A typical transponder costs $1.2 million to lease each year". That's probably not far off.
Then there's the equipment for uplinking. That'll be many thousands.
 
how far can you move the hack rf before the signal starts to get to get bad
 
fsphil said:
Given the puny output power, it's likely your only viewers would be at Jodrell Bank or Goonhilly. And I bet even they would struggle.
I believe even the current generation of broadcast satellites could be used for analogue, if someone is willing to hire a transponder :-)
Click to expand...
No reason why any of the tp's coundnt carry analogue if so desired. A satellite tp is basically just a "bent pipe" in apace - it reflects down to earth what it receives on the uplink. There is some fancy frequency shifting & amplification but its nothing particularly special.

The ONLY reason analogue transmissions got shut down in favour of digital is spectral & cost efficiency. If you can transmit 15 digital channels in the same spectrum as 1 analogue channel you immediately cut individual channel running costs by a factor of 15. And if you rent 10 tps then you can transmit 150 channel instead of 10.
 
astra 1D said:
how far can you move the hack rf before the signal starts to get to get bad
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Does it really matter? Its an interesting application of old technology but no-one is going to use it further than across their garden.
 
Analoguesat said:
Does it really matter? Its an interesting application of old technology but no-one is going to use it further than across their garden.
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I know it’s just interesting to know
 
Ok thanks
 
I managed 5 metres but ran out of space, but yeah it depends on many things. It's not even certain that all hackrf's leak these signals, it might get "fixed" in future versions.
 
I tried it on my HackRF today and it worked quite well but not perfect. I used to have one of the Lidl camping dishes but it didn't survive a house move a few years ago, would have been ideal for this. I only have a Saorsat Ka band LNB so I used that instead.

I transmitted at 5 GHz to pick up on the LNB at 20 GHz. The caveats were that I had to invert the video polarity and that the positioning of the LNB was very precise. Deviation looked best at 4 MHz. I had to remove the RF shield and case in order to get a decent picture. I also got some wavy lines on the screen but that might be down to my equipment, not too sure.

 
steeviebops said:
I tried it on my HackRF today and it worked quite well but not perfect. I used to have one of the Lidl camping dishes but it didn't survive a house move a few years ago, would have been ideal for this. I only have a Saorsat Ka band LNB so I used that instead.

I transmitted at 5 GHz to pick up on the LNB at 20 GHz. The caveats were that I had to invert the video polarity and that the positioning of the LNB was very precise. Deviation looked best at 4 MHz. I had to remove the RF shield and case in order to get a decent picture. I also got some wavy lines on the screen but that might be down to my equipment, not too sure.

Click to expand...
what receiver is that
 
steeviebops said:
@Captain Jack is on the ball, it is indeed an SRD2000.
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You should try getting live analogue

Fringe Reception - Definition(s) ?

@John how do you switch between CBAND and KU (and KA?). on your PF dish? Like this .... My 2.2 mtr Elite Antennas reflector was originally just a dedicated tuned for max performance Cband only job but i was lacking some Ka and fringe Ku signals from my 1.2mtr Gibby antenna so i reluctantly...
www.satellites.co.uk www.satellites.co.uk
 
Im going to split this C-band chat off into its own thread as you seem determined to derail the hack tv chat with it.


Edit - Ive moved your posts here

Getting started in C-band

Wait there are still analog signals! A/S edit - this topic has been split off the hack tv chat
www.satellites.co.uk www.satellites.co.uk

You can chat away as much as you like without taking this thread off topic
 
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