[sdiy] Wireless stuff

[Needham, Alan]

| On 1/19/11 7:39 AM, "Karl Ekdahl" <elektrodwarf at yahoo.se> wrote:
| 
| > Hi list. I was wondering if anyone's done wireless audio and how to
| cheaply
| > make it? It seems to me it shouldn't be very hard or expensive to do
| wireless
| > receivers / transmitters for audio - but i'm not really sure where
to
| start as
| > i've never dealt with this kinda stuff before. For simplicity's sake
if
| > transmitting audio it seems to me that sending and receiving analog
| signals
| > would be a hell of a lot easier then doing it digitally. Also, i'm
| wondering
| > how many separate channels one could do this on - the FM band seems
like
| a bad
| > idea since there's potential collisions with local radio... any
clues? I
| just
| > thought that the wireless receiver/transmitters out there seems
really
| bulky
| > for what they do and also very costly, i get a feeling one should be
| able to
| > DIY this for not that much money. Dreaming of never buying another
snake
| cable
| > ever again....
| >
| > Karl
| >
| Hi Karl,
| 
| I am using STS 5.8 GHz radios for wireless multichannel speaker and
| wireless
| headphone apps.
| 
| Regards,
| 
| Terry
| 
I guess the UK will be similar to USA for regulation (read OfCom for
FCC)
But we have a few license exempt frequencies, I use 2.4GHz to carry
video and stereo sound (nowhere near studio quality but ample for
short-hop CCTV).
Amateur radio licensing gives you a lot more freedom - many more bands
from a few hundred kHz to microwave, but your gear has to "accept
interference", if someone or something else jams you it's tough!
If you are a licensed amateur and a neighbour complains the authorities
can and DO investigate - I've seen it happen.

The encoding method (AM, FM, digital, ...) doesn't change anything but
cost and distortion mechanisms; you still need to consider either
getting a license or sticking to license-exempt frequencies and power
levels.

In short - commercial gear probably saves a ton of time and failed
experiments and gives you a solution that has known parameters - worth
the cost? Maybe!
	Alan


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