BC-DX 789 05 Jan 2007 Private Verwendung der Meldun

2030-2100 KBS World Radio
2100-2130 RTE Ireland
2130-2200 R. Romania International
2200-2300 R. Netherlands
(Glenn Hauser-OK-USA, dxld)
See
blue colour area = 9955 kHz, white = 7385 kHz. (wb, Aug 12)
PULSE OTH RADAR INTERFERENCE
from SE Asia continues to plague the high frequencies. It is not from the
Australian JORN system but said to be from Hainan Is., S. China. Now it
comes across in three broad bands on HF; ca 7.3 to 9 MHz, 12.5 to 15.5 MHz
and 19 to over 24 MHz (26 at times). In daytime it is particularly strong
around 7.5, 14.4 and 23 MHz. I have tried to contact the IARU
(International Amateur Radio Union) concerning the interference to the
Amateur bands but have not received any response after a few weeks.
The Region 3 (Americas) section of IARU acknowledges the level of
interference and wishes something could be done about it. The interference
can be heard as a slow pulse, 5 or 6 per second, with a swishing chuff-
chuff-chuff sound, not a sharp pulse, probably softened by multihop and
multipath propagation. It can be heard above 13 MHz at night too when such
frequencies are 'dead', and best reception is on a vertical antenna (low
angle DX). But I am really amazed that so few people have heard it or have
commented on it. It is really horrible interference to weak-signal
reception.
(Des Walsh-IRL, Aug WDXC-UK Contact magazine via Alan Roe-UK, and via
dxld)
vy73 de Wolfgang DF5SX