BC-DX 789 05 Jan 2007 Private Verwendung der Meldun

the carriers of these stations are controlled by very stable atomic
clocks, the path off the ionosphere is not stable. In listening areas that
receive equal strength signal, the mixing of the two signal will cause
interference for both stations. The reception will fade in and out as the
signals cancel each other.
Michael, the codes for CHU and WWV have their own merits. The 'obnoxious
modem tones' are still an effective way to send information. It has been
and still is an easy way to decode data. CHU sends all the information it
needs in a fraction of a second, whereas WWV spreads it over the entire
minute. There is a much greater chance of losing data, from fading and
noise, when the information is spread over a long time.
(Raymond Pelletier, Frequency and Time Institute for National Measurement
Standards, National Research Council Canada
M-36, room 1026, 1200 Montreal Road, Ottawa, Canada K1A 0R6
Tel: (613) 993-3430 Fax: (613) 952-1394
Government of Canada May 24
(dxld May 23)
CHAD UNID on [previous] 7311-7313 kHz variable. see new UNIDENTIFIED
7291v.
CHINA Xinjiang Broadcast Station (XJBS). The XJBS, change to summer
time (May 1) and summer sked of May 20:
cf. CNR A07 Schedule at
(Shigenori Aoki-JPN, ndxc HQ via wwdxc BC-DX May 20; via Sei-ichi
Hasegawa-JPN)
Chinese Firedrake Jamming full recording.
Several days ago we mentioned that some Japanese DXers made a recording of
a full Chinese
Firedrake Jamming, which was published in one edition of the DXLD in 2006.
Here are the links - Streaming:
Download (58.5MB, 1h3min58s, 128kbps/44kHz):
(Dragan Lekic-SRB, dxld May 24)
Right now, May 22 at 1130, I am hearing Firedrake jamming on 9200, 10300,
13970, 14500 and 18160. To make a bad thing worse, especially for the HAM
society, 18160 is now being scorched by two Firedrakes with a moderate SAH
and some echoing. 9200 tends to close early and I guess that is why you
did not hear it.
- During the 1200 monitoring break Chinese talk from presumed SOH was
heard on 18160 and 14500. Jamming resumed on all five frequencies at 1205.
- After the 1300 break all five frequencies again were jammed from 1305.
At this time propagation from China on 16 m was down, and AIR Chinese
could actually be heard on 17705 almost in level with the CNR-1 jammer
until 1315. Presumed VOT on 17560 was stronger than the co-channel
Firedrake. Later VOT to 17563 and the jammer to 17565.
- During the 1400 break Chinese was heard on 18160 (weak) and 14500
(fair). Again all five frequencies jammed from 1405. VOT now on 17567,
jammer on 17565.
- 1500 VOT on 17571, the jammer on 17570, station gone at 1525 recheck.
All five SOH frequencies again jammed from 1505.