For ARQ there is an additional criterion, viz. the value to look for is the
thin border
line between 95% and 100% copy. 95% copy is generally not enough for efficient
ARQ operation.
That is why pskmail does not use S/N levels as the only parameter for switching
modes,
additionally we use block
"Gary" wrote:
>Maybe there is something that the path simulators are missing.
It could be Gary and I think it's fair to say that propagation
simulators are just not capable of capturing all the variables of the HF
channel. They do, for the most part, capture the fundamental
characteristics o
On 4/2/2010 5:24 AM, vk2eta wrote:
Hi Tony, Thank you for the information.
My pleasure John, wish I could have helped more. Thank you for your
field tests.
I should be able to safely eliminate ground waves over that distance
(95 miles).
It would also be interesting if you could work
Rein, what is the cause of the 1700hr "heaviest" multipath? Is that a
ionospheric condition of some peak airport traffic issue ?
Andy K3Uk
On Fri, Apr 2, 2010 at 7:35 AM, Rein Couperus wrote:
>
>
> I have done several tests with DA5UWG on 80m, and the 200 km path still
> shows lots of multi
I have done several tests with DA5UWG on 80m, and the 200 km path still shows
lots of multipath.
Both antennas are low (mine is a full wave 80m loop at 10m, DA5UWG has a dipole
at 12m).
Sometimes the mode goes up to PSK500 for a few frames, but it always switches
back to PSK500R, PSK250R or
MF
