[Laser] ATV laser DX record

[Zilvinas Atkociunas]

F1AVYopto at aol.com wrote:
> Hello all 
> I have found some schematics that could be the ones  used.
> It seems they used a 20 MHz FM sub-carrier with NE564 ICs used as FM  
> modulator and demodulator.
> The RX uses a BPW34 loaded by a coil and followed  by a MOS FETs amplifier.
> http://www.mydarc.de/dj1wf/Laser/QRV2.html
> The FM  is the single way to reduce the scintillation effects via the AM 
> demodulator  rejection.
> With direct AM video, the pictures and lines synchronisation should be  
> impossible to more than some Kilometers.
> 73 Yves
>  
>
>
>
>    
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Greetings,

Some more material regarding fm modulation - just replace fiber with air ;-)

http://www.standardics.nxp.com/support/documents/rf/pdf/an1434.pdf

73 Zilvis ly2ss