"Tim Wescott" wrote in message
...
MikeN wrote:
Hi

Has anyone given thought to producing NBFM using the AD 9854 or
similar DDS chips, for multiplying or heterodyning up to 2m or 70cm.

This could be an interesting project. I see Analog Devices has an
application note AN-543 which describes a stereo WBFM generator with
output on 90.3 MHz.

73 de MikeN ZL1BNB

I've been considering it for years; it should work OK as long as your
sample rates are high enough. In fact there are nice, small DSP chips
now that should implement a good FM receiver to go along with it for a
complete transceiver.

It's never been a paying project for me, and it's never made it to the
top of the "home brew" pile, so it stays in "would be cool" land.
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

I wouldn't be surprised if this wasn't the algorithm used in DSP generation
of FM.

It was used to generate four part music, in software, back in the early 80's
with a 0.9 MHz 6809 CPU.
--
Steve N, K,9;d, c. i My email has no u's.