Jun 17, 2014

Time not to be audible

Hi all

Everyday morning, I heard on 30m. I found one matter. That is not audible time
 
That mean, before 1 minute I heard DX signal. However after 1 minute, I cannot heard DX signal, it 's everything.
 
This situation keep about 30 minutes.  In the meantime, nothing can be heard.
 
After 30 minutes the DX signal return again.
 
I usual heard time as same not be audible time. Therefore I cannot QSO that time.
 
So my activity to down now.