----- Original Message -----
Sent: Thursday, January 31, 2019 8:11
AM
Subject: Re: LF: VO1NA EbNaut
Jay, Joe, LF,
Interesting. And thanks for reminding that
Joe has been on the air. What were the parameters of the transmission? I can't
find the message announcement...
73, Stefan
Am
31.01.2019 12:29, schrieb [email protected]:
Joe & EbNaut-eers
Had not checked in on VO1NA LF EbNaut for some time so decided to have
a look. Immediately noticed the unusually large spread between car
Eb/N0 and Eb/N0. Inspection of the phase plots revealed the problem ...
there were two minute periods of 'disruption' on an otherwise
clean phase plots. By matching up the observed 'disruption' times with the
WSPR database I was able to determine the interfering signal was WSPR
and belonged to K3RWR (one of the strongest LF signals at this
location). Considering K3RWR's signal is outside the SpecLab
FFT bandwidth the problem is most likely happening at the
receiver ... a Cubic SMA-2400. AGC was turned on at the time to
prevent audio distortion from the stronger WSPR signals. When time
permits I'll run another test with AGC turned off.
Last night's reception list:
0130 Rank 0 car Eb/N0 16.2 Eb/N0 8.9 *******
0200 Rank 0 car Eb/N0 20.1 Eb/N0 12.3 **VO1NA
0230 Rank 0 car Eb/N0 29.1 Eb/N0 15.3 *******
0300 Rank 0 car Eb/N0 27.9 Eb/N0 15.6 **VO1NA
0330 Rank 0 car Eb/N0 28.0 Eb/N0 13.3 *******
0400 Rank 0 car Eb/N0 28.7 Eb/N0 11.9 **VO1NA
Phase plot below.
Jay W1VD
