Ed Muns wrote:
What DSP bandwidths were you using and where did you have your crystal
filters engaging? There is only a 65 Hz bandwidth difference between the
"400" and "250" crystal filters and both are wider than the what is needed
for 170 Hz shift RTTY. The crystal filter function is to protect the DSP
For clarity, 170Hz is less than the minimum required bandwidth for RTTY.
That needs to be extended by some multiple (> 1.0) of the baud rate,
to avoid excessive truncation of significant sidebands. I would suggest
that a filter that was significantly down at 250 Hz would be introducing
significant distortion.
--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm>
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
