Hello Skip,
On 4/16/2010 4:24 AM, KH6TY wrote:
Hi Tony,
The aircraft reflections are usually recognizable.
They certainly are - especially at UHF.
You can hear the pulsations in the background noise change in rate as
the airplane flies around and sometimes even see the frequency shift
on
FWIW, PSK125R does not survive the Doppler disturbances on UHF. Olivia
or Contestia does. Therefore, the mode we have found works best under
the severe conditions of multipath, Doppler shift, Doppler spread, and
very weak signals is Contestia 16-500 at 30 wpm. the minimum S/N is
-12 dB,
Hi Tony,
The aircraft reflections are usually recognizable. You can hear the
pulsations in the background noise change in rate as the airplane flies
around and sometimes even see the frequency shift on the waterfall, but
the big problem is that there is an almost constant, often fast, shift
I will be there too.
Andy K3UK
On Thu, Apr 15, 2010 at 3:46 PM, Tony d...@optonline.net wrote:
All,
I'll be QRV for digital mode testing this evening after 2200z (April 15)
till 0500z (April 16).
QRG 14108 / 3588 (+ / - QRM).
Modes of interest:
1. MFSK32 (Fldigi)
2. PSK250R
FWIW, PSK125R does not survive the Doppler disturbances on UHF. Olivia
or Contestia does. Therefore, the mode we have found works best under
the severe conditions of multipath, Doppler shift, Doppler spread, and
very weak signals is Contestia 16-500 at 30 wpm. the minimum S/N is -12
dB, which
