[GreenKeys] Repeater - DSP

[Bob Camp]

Hi

If we went the repeater route there is an interesting thing we might be 
able to do. Good old FSK is not a very fancy modulation technique by 
today's standards. We can transmit a couple of things that are a bit 
more modern, but still look like FSK. Each of them have a bit of an 
advantage *if* you run a fancy DSP style TU. Generating them may be a 
little tough but we only have to do it on the repeater transmitter.

One thing you can do is transmit the two FSK shift tones as properly 
modulated AM each with a coherent carrier. This gets you a bit better 
signal to noise on the receive end. It still looks like FSK to a FSK 
TU. There are a couple of other things you could do and still be "fsk 
compatible"  but they would take a bit more R&D.

	Any Thoughts?

		Bob Camp
		KB8TQ