----- Original Message -----

From: Herb

To: LPFM_Radio@...

Sent: Tuesday, July 14, 2009 10:28 AM

Subject: Re: [LPFM] STLs..

> There's some digital audio senders around @ 2.4GHz that work well after being modified to have antenna out sockets with grid antennas. They do forward error correction, sound pretty transparent (uncompressed 16-bit 44,100Hz stereo, 20Hz-20KHz) and nothing else seems to work on the same channel when they are running. However it's still open to interference. They do let you use 4W since they are digitally modulated. I tried one over 3KM's non line of site in a 50,000 population town, didn't suffer any interference even with only about 10mW going in to a grid antenna. With a booster on the right cable to get 4W after the antenna they run extremely well.
>
> Mosgiel on the back of Dunedin are using one, a DAS-100's digital sender, I forget the PCB board numbers now my other one is been tested elsewhere. That seems to still be working for them fine in the 2.4GHz band despite the receiver being able to change channel automatically if someone else sent it a powerful enough digital signal to it. There's newer one's that also use frequency hopping but I haven't personally tried them yet. However again, open to interference and require some blind setup work (no level metering etc...)
>

Thanks Gavin, very informative.

What you have written above interests me most. I just tried a google search for Das-100, but can't find anything relevent. Any cjance you could send me a link please?

There are a few AV senders on trade me, how do you know if they are analogue or digital?

Cheers,

Herb.