Dave, Gus, I noticed it too. The picture (in jpeg format) is saved with an .html extension. It seems that only IE looks into the code and recognizes the jpeg format, other browser don't check and jus
Hello Richard, I copied you 429 on 502.0 and a bit later on 502.5 But as Perdo, ON7WP, (here 599+40dB) was on I didn't call. Let's try a QSO one of the next days (when QRN is low it should work). GW3
Jim, NIL here (JO20IX) at 20:30 UTC But is not yet completely dark outside. I will try again later. 73, Rik ON7YD - OR7T Dear All, G7NKS active on 503KHz at 21.20 BST/20.20 UTC sending CW @ 5wpm "CQ
Jim, audible copy here on the 500kHz antenna 73, Rik ON7YD - OR7T Dear Gerhard, LF Group, The beacon is now running again at 2000utc, as before in DFCW mode centered on 137.680kHz. I will leave it ru
Mal, that has nothing to do with the document (that in fact is a series of gif pictures) but with the settings of your browser that by default adjusts the picture to fit in the screen. Solution 1: bu
Pedro, I have a VXO with a 4MHz ceramic resonator. That signal is divided by 8. Range is 500.5 - 506kHz. see http://wireless.org.uk/500k_tx.gif http://wireless.org.uk/qtx.htm 4MHz cer. resonators are
Just worked ON7WP on 503, 599+ both side (only 20km). Pedro is still calling. He is running 100W into a 40m high vertical (full size quarter wave for topband). 73, Rik ON7YD - OR7T
Dear Peter, thanks for your interesting mail. One question regarding the general formula for radiation resistance: In other places I found Rrad = 160*Pi^2*(Heff/lambda)^2 = 1579*(Heff/lambda)^2 where
Jeff, Marcus, STGW30NC60WD has a turnoff delay of 120ns. Turn on delay and rise / fall times are better than 30ns. That should be good enough for 137kHz, maybe even for 500kHz. It further has a max.
Some other fast IGBT's: http://www.promelec.ru/pdf/SGH80N60UF.pdf http://www.bjrtd.com/pdf/sgh23n60ufd.pdf http://www.abcd-e.cn/abcd-e/www/a/products/transistor/a/SGH40N60UFD.pdf 73, Rik At 12:07 3/0
Graham, I called you once. As it was already rather late (we're one hour ahead of UK), QRN level was high and we already worked before I didn't insist. 73, Rik ON7YD - OR7T Thanks Rik Did you call us
Mike, I am a bit sceptic about "bio-electric noise". If a tree turns out to be a noise source I might be more likely that it acts as a (very poor) antenna that picks up signals and re-radiates them.
For someone that has not progressed beyond basic entry level CW you are not in a position to compare the merits of CW v other non morse modes. I guess that counts a an personal attack. I haven't noti
Chris, John, indeed, in theory radiation resistance is proportional to the square of the height (for a short vertical antenna). So "jacking up" the antenna even a few meter is worth the efford. As a
Piotr, for Belgium: Frequency: 501-504kHz Power: max. 5W EIRP Modes: telegraphy as per ITU definition, meaning it includes digital text modes such as the various PSK and FSK modes, with a max. bandwi
I am often monitoring WSPR signals and yesterday I decoded OR7T with 50 mW ERP! Gerhard, it was 5mW ERP (0.005) : 2009-10-21 21:24 OR7T 0.503889 -10 0 JO20ix 0.005 DK6NI JN59ln 471 107 Based on the -
Dear all, it is a bit off topic but maybe interesting to some: From 16-20 November there is the 6th European Space Weather Week in Bruges (Belgium), see http://sidc.oma.be/esww6/index.php . Although
