Topband: Band Open - But No Sunrise Peak

[Nick Hall-Patch]

Wasn't some of the apparent peaking of signals at sunrise due to 
improved signal to noise levels as noise levels drop at sunrise?

20 years ago for many of us, noise levels did actually drop at 
sunrise.   For many DXers now, (man-made) noise levels stay the same 
after sunrise, so, no apparent increase in signal strength (actually 
increase in S/N ratio).

This is not to say that there was  no "real" increase in signal 
levels at sunrise 20 years ago, just that it was perhaps less 
frequent than was thought at the time.    If someone has recorded 
signal strength levels from that period, I'd be happy to be proved wrong.

This morning, in western Canada, a medium-wave broadcaster, 
HLAZ-1566kHz from South Korea was audible until after 1700UT,  an 
hour past local sunrise, with a reasonable sunrise 
peak.    Yesterday, there wasn't much of a sunrise peak, and  local 
noise conditions haven't changed that much over 24 hours.

Was any west coaster on 160m on those two mornings?

73,

Nick
VE7DXR



At 14:52 2018-01-12, Petr Ourednik wrote:
>Hi all,
>
>the original question was about the signals level peak during the 
>SR/SS phenomenon time... did someone noticed the same "No Sunrise 
>peak" behavior please?
>
>73 - Petr, OK1RP
>
>On Fri, Jan 12, 2018, at 3:40 PM, Ken Boasi wrote:
> > High noise levels must be driving people off the band. Conditions have
> > been generally good in the last week, but activity has been light.
> >
> > Have heard several UA9 stations on both 80/160 and worked a few on 80.
> > Europe has also been in very good on both bands.
> >
> > I heard you working the US last night Roger-you were about 579 
> when I listened.
> >
> > I know a number of folks in the NE USA worked UK9AA last night with 'AA
> > having a good signal for a few hours between 2300-0200z.
> >
> > 73, Ken N2ZN
> >
> > > On Jan 12, 2018, at 9:04 AM, GEORGE WALLNER <aa7jv at atlanticbb.net> wrote:
> > >
> > > Some EU stations were S7 in Miami last night, Unfortunately, 
> noise on my TX antenna was also S7.
> > >
> > > George
> > > AA7JV
> > >
> > >
> > > On Fri, 12 Jan 2018 07:34:58 -0500
> > > Thomas Hoyer <thoyer1 at verizon.net> wrote:
> > >> I must be in a black hole as I have listened every night this 
> week and heard no EU. Probably doesn't help I have an S7 to S9 
> noise level though....................
> > >> Tom
> > >> W3TA
> > >> -----Original Message-----
> > >> From: Roger Kennedy <roger at wessexproductions.co.uk>
> > >> To: topband <topband at contesting.com>
> > >> Sent: Fri, Jan 12, 2018 4:57 am
> > >> Subject: Topband:  Band Open - But No Sunrise Peak
> > >> The band has been open for DX from Europe almost every night 
> this week . . .
> > >> so let's hear some more activity from you North American guys!   (I'm
> > >> usually on from around 23.30 Z)
> > >> However . . . I'm still amazed that there seems to be no peak in signals
> > >> around our Sunrise (in the old days, when conditions were much 
> better, signals would usually
> > >> increase by at least 10 to 20dB, both ways)
> > >> Roger G3YRO
> > >> _________________
> > >> Topband Reflector Archives - http://www.contesting.com/_topband
> > >> _________________
> > >> Topband Reflector Archives - http://www.contesting.com/_topband
> > >
> > > _________________
> > > Topband Reflector Archives - http://www.contesting.com/_topband
> >
> > _________________
> > Topband Reflector Archives - http://www.contesting.com/_topband
>
>
>--
>73 - Petr, OK1RP
>B: goo.gl/Fd2JhJ
>G+: goo.gl/w3u2s9
>G+: goo.gl/gP99xq
>_________________
>Topband Reflector Archives - http://www.contesting.com/_topband

Nick Hall-Patch
Victoria, BC
Canada 


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