On 4/20/2010 3:32 AM, KH6TY wrote:
Hi Tony, When both stations are within the same ducting level, the
only audible Doppler effect is usually reflections from airplanes, and
sounds much like your recording. When there is no propagation
enhancement showing on the Hepburn maps, there is usually
Tony, thanks for images. We will try with some single carriers next week
and see what happens.
The conditions we are currently testing under are with no ducting at all
on the Hepburn map, so I assume it is all tropospheric scatter.
This morning, SSB phone was very badly chopped up, but
On 4/21/2010 3:25 PM, KH6TY wrote:
This morning, SSB phone was very badly chopped up, but signals varied
from S1 to S4, so we had another opportunity to test digital modes. We
tried DominiEx 11, DominoEx 11 with FEC, Thor 11, and Contestia
16-500. In each case, Contestia produced about 90%
Yes, the chopping of the SSB voice is very similar to what the second
half of the MT63 signal sounds like. Next week, we'll try MT63 and just
compare the sounds to SSB phone over the air.
Thanks for the simulation!
If you get a chance, please run Contestia against Olivia and see if you
get
Hi Tony,
Thanks for making the recording of aircraft reflections. Yes, we also
see and hear aircraft reflections mixed with atmospheric disturbances
all the time. The aircraft reflections sound similar to what you hear on
the beacon, and you can identify those because they vary in frequency
On Tue, Apr 20, 2010 at 03:32:18AM -0400, KH6TY wrote:
Hi Tony,
Thanks for making the recording of aircraft reflections. Yes, we also
see and hear aircraft reflections mixed with atmospheric disturbances
all the time. The aircraft reflections sound similar to what you hear on
the beacon,
Skip,
Thanks for the UHF screenshots. There has to be motion or change taking
place within the refractive medium to cause Doppler and it would seem
this holds true for the type of atmospheric enhancement found on
VHF/UHF. I can see why it's necessary to use the most robust modes if
both
