Jean-Louis is right, Is seems that even Heinrich Hertz's original experiment demonstrating the existance of radio waves in 1887 was probably achieved at VHF frequencies - judging by the dimensions of
Hi All, Lack of interference form Tesla coils... Thinking about it from a "conservation of energy" point of view, most of the energy must be going into producing heat, light and sound, and ripping mo
Hi Andy, I don't quite know where EMP crept into the discussion. Dick's original E-mail to this reflector was about a paper on Radiation Belt Remediation. http://www.physics.otago.ac.nz/research/spac
Hi Dick, 1. Was there not a similar scare a few years ago about ionospheric warming casued by HAARP experiments etc. ? 2. Pat g4gvw makes very valid objections in his E-mail, matters which seem to be
Hi Gary, I use an FT847 on 4m, and can confirm it is both inefficient and deaf. But it does work, and I have had some nice contacts on it - including Portugal this year. May I recommend the website h
Hi Dick, Sorry, I meant to paste in the URL for the Basic Program. Here it is. http://www.m0wye.radiouk.com/QRSS.BAS 73 Hugh M0WYE Where can I find a simple, and not too large to download programm to
Hi Dick, I wrote and used a QBASIC program to send QRSS morse. QBASIC is supplied free with Windows 98SE and earlier computers. (You will find it on the Windows disk even if it hasn't been installed)
Hi Alan, I assume this is Ebay item 110018394886 or 110015625846. Both certainly have a frequency display in the photo - although the instruments look a bit beaten up. My D2006s are older than this a
Hi All, I have successfully used this method to retune 27MHz radio control crystals to produce a couple of channel frequencies around 433.500 MHz (when multiplied by 16). I used a pencil rubbed gentl
Hi Willem, What are you trying to do ? - maybe someone on the reflector can help. Looks like you are sending a picture. There is a size limit (10kbytes ?) 73 Hugh M0WYE -- Original Message -- From: "
Hi Andy, Why don't you E-mail the Professor at MIT. His background and E-mail address are publicly available on this page: http://web.mit.edu/physics/facultyandstaff/faculty/marin_soljacic.html My fi
Hello Wolf, You wrote ... A similar method is described in 'The Scientist's Guide to Digital Signal Processing" (look for the overlap/add method in chapter 18; it's available online for free ). Pleas
Hello Tracey Pardon my ignorance ... what does NDB stand for ? 73 Hugh M0WYE "Don't be afraid to ask dumb questions" - sign seen above Greenwich University Library Equiries Desk Hi Warren There are a
Hi Jim, What an interesting experiment, and illuminating, although it told us what we already suspected, that lush foliage makes a nice garden, but rather spoils RF performance. I have not come acros
Hello Group, According to the Services Textbook of Radio, the Beverage is one of the few aerials which works best over ground of poor conductivity. This is because the wavefront is slowed down near t
