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Commercial use of any material is expressly prohibited. Educational use is permitted with implicit consent.
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Copyright 2000-2021 R. C. Mazur, VA3ROM.
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Updates
 
23 November 2021
Finally got around to reedditing and adding my past TCA articles "ISM Band HiFER Beacons: Part 3" (RM048), "Tinker Tailor Circuit CAD" (RM049) and "In the Year 2012..." (RM050) to the Radio Magic page.
 
31 October 2021
Well it appears that the "curse" of the odd numbered Windows OS is alive & well. New computers come with Windows 11 & new headaches. Why on earth the Microsoft programmers put the most commonly used mouse right-click commands (like cut, copy, paste, et al) in a second sub-menu is bizarre! Many older Windows 10 computers will not be able to upgrade (thankfully or fortunately) because of obtuse system requirements. Not as bad as Vista but not as good as the hype makes it out to be.
 
30 October 2021
Added supporting material for my next TCA column "FM Voice & Data & the ISS: Part 1" (RM052) to the Radio Magic page.
 
Put my new ZackTek WSPR Desktop transmitter & 7-28 MHz end-fed dipole (40, 20, 15 and 10 m) into operation, but the antenna also works well on the 17 & 12 m bands, too! The transmitter is easily programmed with the supplied software & can frequency hop across all the WSPR band segments, depending on the ZackTek version you buy. I added an attenuator pad to reduce RF power from 23 dBm to 10 dBm. Also did some tests with my TinySA & the WSPR Desktop's built-in LPFs do an excellent job of harmonic suppression.
 
The end-fed dipole has elongated high frequency side-lobes (meaning gain) that give my signal a boost from 20 m to 10 m. Its internal 64:1 impedance transformer probably explains its flatter VSWR high frequency response & higher efficiency over the lower turns ratio transformers typically used. Only on 30 m is the VSWR a tad too high (4:1).
 
30 September 2021
Just watched History Channel's "The Machines that Built America, S:1, Ep:7 Tesla vs. Marconi". Last year, I wrote a three-part article about their epic wireless "battle". I knew Marconi stole from others without giving credit or paying royalties, but what I learned from the TV show was that Sir William Peerce, head of the British Postal Service, which controlled all forms of communications in Britain, had met with Nikola Tesla who foolishly revealed the secrets of his "Tesla coil"! But that he saw no future in "etheric" wireless telegraphy, even though he had transmitted messages up to 50 km (Marconi was at 4 km). Tesla believed that the Earth, itself, was the best medium for "telluric" wireless telegraphy as well as for transmitting free electrical power.
 
Shortly afterwards, Peerce met with the young & ambitious Guglielmo Marconi who convinced Peerce that a lot of money could be made from the use of etheric wireless telegraphy messaging between shore and ships at sea. But his limited transmitting range was a stumbling block & he needed money to build a more powerful transmitter. Peerce gave Marconi the information on the Tesla coil & financal support because Peerce thought that he could take advantage of Guglielmo. But Marconi was no business fool (like Tesla was) & quickly discarded Peerce once he no longer needed his help. The rest is history.
 
30 August 2021
Added material for my next TCA column "Antenna Tales..." (RM051) to the Radio Magic page.
 
02 July 2021
Added material for my next TCA column "In the Year 2012..." (RM050) to the Radio Magic page.
 
30 May 2021
Check out HamSCI's new experiment using various time & other radio signals to study effects of this June's solar annular eclipse. Almost any frequency stable radio with upper sideband capability will work albeit a GPS locked radio increases accuracy of frequency measurements. Normal diurnal, seasonal & intense solar radiation storms are factors, too, so it's best to setup in advance to record several days worth of data before & after the eclipse.
 
It's a great way to do real Amateur Radio science & data collected by groups, hobbyists & students can be sent to HamSCI for analysis, which results in a published scientific paper.
 
20 May 2021
Added my reedited past article "ISM Band HiFER Beacons: Part 2" (RM047) plus supplement to the Radio Magic page.
 
24 April 2021
Added material for my next TCA column "Tinker Tailor Circuit CAD..." (RM049) to the Radio Magic page.
 
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