30 Aug 2010

Change of 40M WAI Frequency

It was deceided at the recent IRTS Committee Meeting to
Change the Worked All Ireland Frequencey from 7.068 to 7.170

The W.A.I. awards are open to all amateurs and short wave listeners
throughout, the world, who wish to participate. Membership
of any specific organisation is not pre-requisite.

The aim of the awards scheme is:
To expand the geographical knowledge of Ireland and its offshore

1) To encourage activity in general and promote mobile and
portable expedition activity on both LF and VHF bands.

2) To encourage amateurs and Shortwave Listeners to improve
their operating skills by participating in or running W.A.I. Nets.

16 Aug 2010

Listen To Ham Radio Online With WebSDR

Have you tried to find links to listen to ham radio online lately? How many promising links have you found to be "dead links"? Too many, huh!

The links below will actually take you to sites where you can listen to amateur radio communicating with each other around the world.

The "live" links will let you hear ham radio operators using every imaginable mode of communication... SSB, FM and AM voice, RTTY, SSTV. The list of modes is nearly endless because new ones are experimented with regularly.

WebSDR (Web Software Defined Radio Systems) let many users simultaneously tune the SDR to different frequencies to listen to.

  • EME (Earth-Moon-Earth) 3cm signals using a 25 m dish in Dwingeloo, Drenthe, Netherlands.
  • PA3WEG in Delft, NL - VLF and 70 cm bands.
  • K7UEB (KL7NA op.) -20m band signals from a WebSDR located in Walla Walla University, in College Place, Washington, USA
  • PI4THT - 80m, 40m, 20m band signals from Amateur Radio Club of University Of Twente, Enschede, NL.
  • W4MQ Internet Remote Base - lets you tune and listen to ham radio signals anywhere from the 160m band right up to the 70 cm band! It is located in Reston, Virginia on the East Coast of the USA.

15 Aug 2010

Sun's 'quiet period' explained from BBC News

The Sun's conveyor transports plasma across its surface to the pole, where it sinks before rising at the equator
Solar physicists may have discovered why the Sun recently experienced a prolonged period of weak activity.

The most recent so-called "solar minimum" occurred in December 2008.

Its drawn-out nature extended the total length of the last solar cycle - the repeating cycle of the Sun's activity - to 12.6 years, making it the longest in almost 200 years.

During a solar minimum the Sun is less active, producing fewer sunspots and flares.

The new research suggests that the longer-than-expected period of weak activity may have been linked to changes in the way a hot soup of charged particles called plasma circulated in the Sun.

The study, conducted by Dr Mausumi Dikpati of the National Center for Atmospheric Research in Colorado and her US colleagues, is published in the journal Geophysical Research Letters.

The Sun's activity strengthens and weakens on a cycle that typically lasts 10.7 years. Since accurate records began in 1755, there have been 24 such solar cycles.

The 23rd cycle, which ended in December 2008, was both longer than average and had the smallest number of sunspots for a century. Sunspots are areas of intense magnetic activity that are visible as dark spots on the star's surface.

Currents of fire

The new research suggests that one reason for the prolonged period of weak activity could be changes in the Sun's "conveyor belt".

Similar to the Earth's ocean currents, the Sun's conveyor transports plasma across its surface to the pole. Here, the plasma sinks into the heart of the Sun before rising again at the equator.

During the 23rd cycle, these currents of fire extended all the way to the poles, while in earlier cycles they only extended about two thirds of the way.

Dr Roger Ulrich of the University of California, Los Angeles, a co-author of the study, said the findings highlighted the importance of our monitoring of the Sun.

The research team used sophisticated computer simulations to show how changes in the conveyor might have affected cycle duration. They found that the increased length of the conveyor and its slower rate of return flow explained the prolonged 23rd cycle.

However, Dr David Hathaway, a solar physicist from Nasa's Marshall Space Flight Center in Alabama, who was not involved in the latest study, argued that it was the speed and not the extent of the conveyor that was of real importance.

The conveyor has been running at record high-speeds for over five years. Dr Hathaway said: "I believe this could explain the unusually deep solar minimum."

BBC © 2010

- Posted using BlogPress from my iPhone - 73's DE EI5IX

3 Aug 2010

Active Sun Could Cause Havoc on Earth

Right now, a giant solar shock wave is heading to Earth bringing with it an electromagnetic force set to light up the night sky, according to The Telegraph.