Topband: Interesting 160 Meter QSO

[Bill Tippett]

K1LT:

 >He logged RV6CC at 1013Z.  RV1CC is in St. Petersburg, Russia.  His 
sunrise is 0654Z and sunset is 1316Z.  So, K1LT worked a Russian 
station 3 hours before his sunset, or 3.3 hours after his sunrise, or 
close to noon his local time.

         RV1CC is at ~60 degrees North, so the sun was at ~11 degrees 
and almost due South of his QTH.  This would be equivalent to you 
working a DX station about ~1.25 hours before or after your local 
sunrise/sunset...but not quite the same because the azimuth of the 
sun for you is not due South (i.e. nearly opposite the signal 
path).  The important factor in any of these so called daylight paths 
is the degree to which the sun illuminates the ionosphere on the 
signal path.  If you happen to be near the Arctic Circle (~67N), you 
would have DX propagation around the clock in the winter.  In the 
late 80s, UA1OT was on from Franz Josef Land and was audible in 
Colorado virtually any time there was darkness.  I believe Roman 
almost made WAS...only missing Utah.

                                         73,  Bill W4ZV

http://aa.usno.navy.mil/data/docs/AltAz.php

Astronomical Applications Dept.
U.S. Naval Observatory
Washington, DC 20392-5420

RV1CC

E 30 27, N59 55

Altitude and Azimuth of the Sun
Jan 26, 2008
Universal Time

           Altitude    Azimuth
                       (E of N)

  h  m         o           o

10:10       11.3       179.9
10:20       11.3       182.3


CARROLL, OHIO

W 82 43, N39 48

Altitude and Azimuth of the Sun
Jan 26, 2008
Eastern Standard Time

           Altitude    Azimuth
                       (E of N)

  h  m         o           o

08:50       10.2       125.1
09:00       11.8       126.9

16:20       12.8       231.9
16:30       11.3       233.8