[Elecraft] Analog vs. Digital Front Ends

[Phil Wheeler]

Re GPS: Hardly a "low" orbit, Brian: 'GPS 
satellites fly in medium Earth orbit (MEO) at an 
altitude of *approximately 20,200 km* (*12,550 
miles*). Each satellite circles the Earth twice a 
day.'

Phil W7OX

On 9/16/15 5:54 AM, brian wrote:
> Look at the A/D converter as a chip tool that 
> could potentially be used in ham RX design.
>
> If one wanted a ham band RX using an A/D front 
> end,  certainly one would add front end filters.
>
> Of course, that would only help solve the 
> problem with out of band signals.  Handling the 
> vector sum of in band signals would still have 
> to be designed for.
>
> The concept however is a good one.  Who knows 
> where these A/D chips will be in 2, 5 or 10 years.
>
> I remember when GPS was in its infancy.   Many 
> people thought it was crazy to think that a 
> bunch of low orbit non-geosynchronous satellites 
> could be used for extremely accurate 
> positioning. Besides the ground equipment 
> required would be too expensive for most users.  
> History proves them wrong.
>
>
> 73 de Brian/K3KO