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  • Weather
  • RSS Solar Cycle 24!
    • Sunspot 1102 / Solar Update (August 30) August 30, 2010
      Alpha Sunspot 1101 continues to transit the northern hemisphere of the sun. This region is not magnetically complex and the chances for strong solar flares is low. Sunspot 1102 has grown in size, but remains quiet thus far. […]
    • New Sunspot / Aurora Watch (August 24) August 24, 2010
      A new sunspot has rotated into view on the eastern limb and the mini spotless steak is now over. This region appears simple and the chances for strong solar flares will be very low. An aurora watch is in effect as the coronal hole solar wind stream is now gusting past 600km/s. There will be a chance for minor geomagnetic storming at high latitudes. […]
    • Long Duration C4.4 Flare / Possible CME (August 14) August 14, 2010
      A long duration C4.4 Solar Flare took place at 10:05 UTC Saturday around Sunspot 1093 and 1099 and a possible earth directed CME was generated as well. […]
    • Solar Update / 5 Sunspots (August 11) August 11, 2010
      The sun has a slight peppering of sunspots with now 5 regions visible for the first time. Sunspots 1093, 1096, 1097 and soon to be 1098 occupy the northern hemisphere and Sunspot 1095 quietly persists in the southern hemisphere. There will remain the chance for B-Class flares and perhaps a lower chance of a C-Class flare. […]
    • M-Flare around 1093 (August 7) August 7, 2010
      A Solar flare took place at 18:25 UTC around Sunspot 1093 and it registered M1.0. Sunspot 1093 is now in good position for any possible earth directed Coronal Mass Ejections (CMEs). […]
    • G2 Geomagnetic Storm (August 3) August 4, 2010
      While I was at work Tuesday afternoon, a shock detected by the Ace Spacecraft indicated the arrival of atleast one CME (Coronal Mass Ejection) caused by the long duration C3 flare on Sunday. The K-Index reached 6 and this indicates a G2 Level Geomagnetic Storm. Aurora contacts have been made on VHF. More geomagnetic storming is possible in the next 24 hours […]
    • Earth Directed CME / Eastern Limb Active Regions (August 1) August 1, 2010
      A long duration C3.2 flare took place around Sunspot 1092 on Sunday. In the latest Lasco C3 movie you can see an earth directed Coronal Mass Ejection (CME). There will be a chance for Geomagnetic Storming wtihin 48-72 hours. more to follow. Sunspot 1089 has rotated out of direct earth view and onto the western limb. Currently Sunspot 1092 is the only visible […]
    • Solar Update / Sunspots 1089 + 1092 (July 28) July 29, 2010
      A new sunspot now numbered 1092 rotated into view Wednesday. It is currently a simple sunspot with a small chance for a C-Class flare. Sunspot 1089 located in the southern hemisphere, continues to produce the odd C-Class flare. This region is rotating towards the western limb of the sun. There will continue to be a chance for C-Class flares and perhaps a low […]
    • Sunspot 1089 / Solar Update (July 19) July 20, 2010
      Just as Sunspot 1087 has disappeared, a new sunspot numbered 1089 has rotated into view on the eastern limb. You can see the new images below. There is a slight chance for C-Class flares. […]
    • Sunspot 1087 / Solar Update (July 9) July 10, 2010
      Sunspot 1087 was numbered on Friday and was probably much bigger than it currently is. A few small sunspots are visible, but this region is mostly a pool of magnetic activity. Several C-Class flares have taken place and there could be a slight chance for an M-Class event. […]
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  • RSS Antennas by N6LF
    • Relation between vertical height and radial length March 6, 2010
      In one of my earlier posts I had some information on the relationship between vertical height and optimum radial lengths. That information was buried in a larger document discussing several other items an was not that easy to find, so... […]
    • QEX letter to the editor February 16, 2010
      I recently sent the attached letter to the editor of QEX. It may answer some questions and correct some incorrect figure captions: Download QEX letter to the editor 1 […]
    • Series of QEX articles on ground system experiments December 31, 2009
      Last year I posted results from a series of experiments on ground systems for vertical antennas. That series of reports was converted with some modifications into a series of seven articles in QEX magazine. The ARRL has kindly given me... […]
    • New 600m station at WD2XSH/20 November 5, 2009
      Last August the FCC renewed and expanded the license for the 600m experimental group so for this new season I have rebuilt my antenna and completely redone the station. The following is a description of the current antenna and station... […]
    • A large ID clamp-on RF current transformer June 16, 2009
      Earlier this year I posted a description of a simple clamp-on RF current transformer. Since that time I have updated the design with a much larger ID and the core held in a spring-clamp that allows easy on/off in the... […]
    • Back to NK7U for more tests June 16, 2009
      Earlier I posted a report on the work done last October on the 80m 4-square at NK7U. After that work there were still many unanswered questions so I and W2VJN went back to NK7U at the end of May to... […]
    • An example of the effect of tower coupling on an array March 15, 2009
      It's well known that a nearby tower can affect the performance of a vertical array but I haven't seen any articles which give an actual example. Last fall I made such measurements on an 80m 4-square which clearly show just... […]
    • Vertical-tower interactions March 13, 2009
      Interaction between a vertical and a nearby tower can be a very real concern. I have done a short NEC modeling study on the subject which sheds some light on the subject. It's far from complete and I will no... […]
    • Tower resonance measurements February 13, 2009
      I mentioned on the towertalk reflector that I had been trying to make accurate measurements of resonance in grounded towers with large antennas systems on them. A number of people asked for the details. So here they are: Download Some... […]
    • Comment on comments October 15, 2008
      I just realized that my weblog was open for comments. I thought I had it closed so I have not been reading any of your comments. Please send comments to n6lf@arrl.net […]