This is very interesting. I have commented on this exact problem before in
post-contest summaries, and K3ZO has sent me some very interesting
comments. Locally, for a time we thought the problem on 40 was coming from
the south, but it is clear upon further study that the signals peak on the
DU/JA/YB headings (315 degrees) and rise and fall as the Asian band opening
rises and falls. The conclusion here was that the 40 meter SSB QRM is from
YB land and perhaps DU land from CBers, loggers/truckers, etc. We get very
very good high rate openings to Asia on 40 CW from South Texas, and the SSB
QRM is a killer that takes a 100/hr rate capability and takes it down to
half that or worse at times. I agree with Dave Mueller that the bottom 5
KHx are the worse-after that it's a hit and miss occurence. With the
difficulty of competing with the Northeastern USA in general, it is
maddening to have "our time" on 40, and have it trashed like this!
On 75 meters and 80 CW, the SSB pirate problem seems more from a southern
source.
Jim-N3BB/5
>This stuff is a REAL problem out here. The entire CW portion of 10m
>is constantly filled with garbage from southeast asia, its just
>something I've had to learn to deal with operating from KH2.
> On another note, 40m is worse. Most of the CW portion of the band
>is filled with Indonesian SSBers (logging operations I've been told).
>Anyway it makes things VERY difficult when trying to pull out a
>callsign. When you hear a loud KH2, or T88, ETC, on 40m CW and he's
>having trouble with your call, before calling him an idiot think about
>the 20 over S9 ssb QRM we have to deal with on a nightly basis.
> 2 tips:
>For USA M/M ops.....DONT CQ in the bottom 3 KHz or so of
>the band (40m) when trying to work asia. Thats the worst place I've
>found for the SSB QRM (guys working USB on 7000KHz). 7005-7007 seems
>to be the best places in my limited experience for you to be.
--
CQ-Contest on WWW: http://www.contesting.com/_cq-contest/
Administrative requests: cq-contest-REQUEST@contesting.com
|