Hi Bruce,

Should the satellite do FEC?

Alan VK2ZIW

On Wed, 16 Jan 2019 14:30:23 -0800, Bruce Perens wrote
> In general, it's better to make the satellite a data pipe or an analog pipe, 
> and allow people to control what codec they are using on the ground. It lets 
> you test more different codecs, etc.
> 
> On Wed, Jan 16, 2019 at 1:25 PM cshearer <cshea...@pa.net> wrote:
> Hello,
>      Starting plans of a cube sat project and have been contemplating 
> the use of this codec method (instead of other possible options) for the 
> project and not sure if this has been yet done or what the thoughts 
> would be on the use of this codec vs other methods as I want to 
> incorporate both digital voice and analog voice options. Initial 
> thoughts are to use DV codec2 method for possible greater benefits for 
> both better RF & audio qualities vs analog FM for a cross banded voice 
> repeater as a part of the satellites mission. The implementation would 
> be via on board modem to transmit the digital modulation using an MCU 
> for the direct modulating of the down-link from the received analog 
> up-link input.
> 
> Possible mode configurations would be:
> Mode 1 = Up-link Analog FM / Down-link DV Narrow band (Modulated 
> directly onboard satellite via MCU hardware modem)
> Mode 2 = Up-link DV Narrow-band / Down-link DV Narrow-band (Direct pass 
> through of digital data signal, no reprocessing of signal)
> Mode 3 = Up-link Analog FM / Down-link Analog FM
> 
>      These configuration modes would allow real time in flight mission 
> testing / comparison of the DV codec2 vs analog in 2 different 
> configurations)
> 
>      Would like to know thoughts and would appreciate any points of 
> discussions for this application.
> 
> Thank you,
> NE3KO
> 
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Alan

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