Extensive testing of ROS on the air on UHF have now been concluded.
Unfortunately, ROS totally fails for UHF communications, in either 16
baud, or 1 baud variants, and using either the HF or EME channel.
Even with ROS metric readings between -1 dB and -8 dB (i.e. relatively
strong signals),
error correction, this 'hunting' is a reason for the greater CPU usage.
Simon Brown, HB9DRV
http://sdr-radio.com
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On
Behalf Of hteller
Sent: 21 March 2010 15:38
To: digitalradio@yahoogroups.com
Subject: [digitalradio] ROS
Simon HB9DRV wrote: There's a lot more to Olivia than being
multi-tone MFSK.
I am aware of that, Simon.
However, Olivia is currently the most popular digital mode other than
PSK31 and RTTY, and the question was if ROS 16 baud was worth using
twice the bandwidth of Olivia. We hoped that
If there were documentation on ROS then there would the possibility of
investigating the problem further and maybe adding improvements. Part of
the problem is that even if there is a large degree of spreading
compared to the data rate, the channel is still quite narrow and a large
portion of
Based on observations of the tones on the waterfall on the air, compared
to observing them locally, and hearing the raucous tones compared to
bell-like quality locally, my guess is that perhaps the modulation is
disturbed or the tones moved in frequency far enough so there is no
decoding. If
Yes but at UHF there seems to not be enough spread to tolerate the
Doppler shift. If the frequencies were further apart, and were received
through a wider window, the Doppler would be tolerated better but at
what penalty in noise? I can think of a few ways to solve your problem
but not with
