Hello Neil,


how did you determine the radiation resistance?


and ... just a detail, but the measured current seems a bit low.

For 8 Watt into 225 Ohm the current should be I = sqrt(P/R) = sqrt(8/225) = sqrt(0.3556) = 0.189 A

Can be the amp meter not accurate and/or the TX power overestimated.


But at the end, all what counts is that the radiated signal is going up. Congrats on that!

Try even more wire?


73, Rik  ON7YD



Van: [email protected] <[email protected]> namens Neil Klagge <[email protected]>
Verzonden: maandag 23 januari 2023 23:58
Aan: Posting 600m 600mrg
Onderwerp: [600MRG] Here are my measurements , LOL
 
I have made some new measurements on my power and antenna for 630m.  I am getting the following:

Total system Rt = 225 ohms
Radiation resistance Rr = ~.032 ohms
Total current measured at the top of the loading coil = 0.125 amperes

TPO = 8.0 watts into the coax
EIRP = ~1.5 mW which is 10 dB better than what I was doing previously according to today's ground wave comparisons with ka7oei-1 and ka7oei.   Thus, my previous power must have been about 0.15 mW which I could not report correctly previously using wsjtx. This is because zero dBm = 1 mW is the lowest choice in that software. 

  Wondering if any of this makes sense to any of you !!!
Helpful comments are welcome.  

Thanks, 



*´¨)
¸.•´¸.•*´¨) ¸.•*¨)
(¸.•´ (¸.•`   Neil , wØyse, DN41ah, North Ogden, Utah 84414

My ham radio website: http://w0yse.webs.com/ 

My Faith website: http://neilsfaith.webs.com/