Depending upon your definition of robust, and, if you are using the
modes on HF, with a wide bandwitch (voice width) ARQ mode, it would seem
to be Pactor 3 which can adjust the speed to meet varying conditions.
Raw speed up to SL6 at 3600 bps which can yield a net user data rate of
2722 bps.
Hello Cesco,
ARQ FAE is an ARQ mode for sound cards issued from ALE, which is capable of a
maximum speed in bilateral of 130 bps (a bit less than 1000 characters/mn) at
S/N min of -6.5 dB. It is able to send mails and in the next Multipsk version
mails + files (I hope).
73
Patrick
-
The 8FSK raw speed of ALE-mode provides 375baud,
Try the 8PSK mode in PCALE, under the
The increments are: 75, 150, 300, 600, 1200, 2400 baud.
Thanks.
ARQ makes no sense in DV, and FEC is easily adaptable to meet those 375
or 300 data rates of those 2 modes.
Are any minimum SNR numbers of
Documentation please...
cesco12342000 wrote
@rick:
drm (ofdm) runs circles around scamp, and outperforms pactor3 in data
rate at given snr as well besides that the robot-qrm mode is
insanely expensive.
73... Jon W1MNK Brandon, FL USA
Hi Cesco,
In PCALE, you can choose ARQ or non-ARQ (FEC) for either 8FSK or 8PSK.
The increments are: 75, 150, 300, 600, 1200, 2400 baud.
Are any minimum SNR numbers of those 2 modes known (375/300 bps)?
The SNR for 8FSK can be about -5dB.
The SNR for 8PSK at 75baud is about -10dB.
Sorry, I
I agree that for DV you would not want ARQ as you just can not tolerate
the latency and overhead. It is difficult enough with basic OFDM
modulation and as you noted, needs a good signal to work well enough.
When I responded to your question, I was looking at this as an accurate
transfer of
don't think you can do much better than WinDRM type OFDM modes
since you need the bps throughput to make it work adequately.
you can.
windrm uses 2400 bps at 8db snr min.
drmdv uses 1200 bps at 5 db snr min.
the new codec would use around 250 bps, wich givs an improvement of
6db in minimum
Specifically, I'm looking for the values of the model parameters to
put in a simulator. For example, the CCIR channel models (even
the poor models) of which I am aware don't seem to contain delay
spread values greater than 6 ms, or doppler spread values greater
than a few Hz, yet the cases of
If Scamp was abandoned, is it publicly available for others to play with ?
Andy K3UK
As far as I know the Winlink 2000 developer has not released it. He
initially said he expected to do this, even if it was used for Winlink
2000, but that was over two years ago and he may still have long range
plans for changing the protocols so that it can work with weak signals.
It was
Since RDFT was released under the GPL license, failure to release the
source code for SCAMP may be violation of the GPL license.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, Rick [EMAIL PROTECTED] wrote:
As far as I know the Winlink 2000 developer has not released it. He
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