Re: antennae

[kyle jones <kyle@xxxxxxxxxxxxx>]

kyle jones writes:

Okay flip flop, I re-read the original post better and I have to say that is 
not possible to just use your soundcard out to broadcast and you could not 
even encode in any consumer level audio appz (aka cubase, logic, protools) 
because your sound card and audio software could not handle the sample rates 
necessary to generate carrier frequencies in the broadcast range.  You would 
need a transmitter, I know that there are several kits you can buy and build 
for under 50 dollars and if you can read schematics, then you could probably 
put one together with radio schack parts.  Again, I don't claim to be an 
electrical engineer or the like, so if someone would like to prove my 
statements false, by all means I am quite curious, and would humbly accept 
the evidence. 

Thank you and I am shutting up now, 

Kyle 

> Duh Egg on my face, I see now that the topic is encoding not broadcasting. 
> Many Apologies. 
>
> kyle  
>
> kyle jones writes:  
>
>
> > This am thing will work with say a delta 66 card(24bit 96khz)?  How is 
> > that possible when your maximum playback can be 96 khz (which will play 
> > frequencies of at most 48khz) not anywhere close to 550kz that you would 
> > need as carrier.  Maybe I am missing something and I will be the first to 
> > admit it but that doesn't make sense to me.  
> >
> > ben nevile writes:   
> >
> > > > i'm interested in shortrange radio broadcast (within a 20ft.x20ft.
> > > > room)...going to try to do all the encoding in software
> > >    
> > >
> > > AM is easy, just multiply your (mono) audio signal by a carrier wave
> > > somewhere between 550 and 1300kHz.  if your carrier is at frequency f 
> > > you
> > > will need to filter out all frequencies above nyquist-f if you want to 
> > > avoid
> > > aliasing.  (nyquist is half of your sampling rate: 22kHz for most sound
> > > cards.)   
> > >
> > > the carrier you need to generate an FM signal can't be generated by a 
> > > stock
> > > audio card because it's in the MHz region.  I don't know anything about
> > > antennae but I'm sure there are schematics galore at your googletips.   
> > >
> > > bonne chance
> > > b   
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: microsound-unsubscribe@xxxxxxxxxxxxx
> > > For additional commands, e-mail: microsound-help@xxxxxxxxxxxxx
> > > website: http://www.microsound.org   
> >   
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: microsound-unsubscribe@xxxxxxxxxxxxx
> > For additional commands, e-mail: microsound-help@xxxxxxxxxxxxx
> > website: http://www.microsound.org  
>  
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: microsound-unsubscribe@xxxxxxxxxxxxx
> For additional commands, e-mail: microsound-help@xxxxxxxxxxxxx
> website: http://www.microsound.org