Hi Stefan, I am afraid I touched a sensitive spot ;-) I can only ensure you that is certainly not my intention to blame anyone. I have done some WSPRing last winter and below 2000km distance propagat
Hello Luis, I would't care about that 7km, that's little more than 10 wavelengths ;-) Also compared to the distance between us (about 1500km) it can be neglected. 73, Rik ON7YD - OR7T Van: owner-rsgb
Hello Chris, I guess it will be more or less the same. The setup as in the right picture has the loading coil at ground level, easy to tune. Placing the coil at the top of the tower (picture at the l
I assume that it has washed off a ship on it's way to Stefan ;-) 73, Rik ON7YD - OR7T Van: [email protected] <[email protected]> namens 'Mike Dennison' mike.dennison@ntlwo
Hi Roelof, indeed, all bands dead. Someone hit the "emergency stop" switch by accident ;-) But at least 20m seems to be slowly recovering now ... What could be the effect on 136kHz / 472kHz in the ne
seems to be a X10 flare, it has been a while that we had such a strong flare 73, Rik ON7YD Van: [email protected] <[email protected]> namens Markus Vester <markusves
Hi Jack, I agree with Stefan that a loop is not a very good choise to transmit on LF, for the simple reason that the radiation resistance (Rrad) of a loop drops with the 4th power of the frequency, w
Hello Ian, Andy, all, I am using a Delta 1200S48 SMPSU (see https://www.prbx.com/wp-content/uploads/pimfiles/560/dts_1200s.pdf). I cannot detect any noise coming from this PSU on 137 or 475 kHz. Outp
Hello Ian, I got mine for free from a friend. It is a "industry style" design, pretty foolproof. Indeed they are not produced anymore, but maybe they show up on ebay once in a while. If you can get o
Hello Paul, I just had a look at the circuit (http://qrp-labs.com/ultimate3/u3mods/lfamp.html). One end of the output transformer connected is to the +13.8V should be "cold" (no RF). As already menti
A pitty that then 'slower' JT9 versions have been abandoned. I found in particular JT9-2 (2 minute sequences) very useful on 472 kHz. A QSO took about 10 minutes and these was a +/- 3dB advantage ove
Hello Wolf, Murray, thanks for the info and the new mode. I have added the message to the http://www.472kHz.org​ website. 73, Rik ON7YD - OR7T Van: [email protected] <owner-rsg
​Hello Dominico, thanks for my first WSQCALL QSO. I copied you 100%, but the signal was pretty strong so JT9 and maybe FT8 would have worked too. I worked Ian, G4GIR afterward. I have a lot of
Hello Luis, very good copy here, up to -4dB. I called you and according to PSKreporter at least one of my transmissions reached you (although at -27dB). 73, Rik ON7YD - OR7T Van: owner-rsgb_lf_group@
​Hello Luis, great to have a QSO at last. Your signal was really strong here. I am afraid that living in a tower building inevitable comes with high QRM levels. Maybe an remote antenna (as Stef
Hello Nicolas, thanks for the JT9 QSO. As expected WSJT-X did not digest the special call, so I had to use free messages. Quite a challenge with the 13 character limit (but that's where a short calls
​​Hello John, indeed remarkable condititions. While condx were good across the pacific, transatlantic propagaton was poor last night Maybe the opening started too late for Europe (already
Great idea David! I hope you don't mind that I placed your invitation on http://www.472kHz.org.​ 73, Rik ON7YD - OR7T Van: [email protected] <[email protected]
Hi Dave, Same here, nothing wrong with your PC or internet connection. HNY Rik ON7YD - OR7T Anyone else having trouble accessing the wprnet.org site this morning? Dave G(M)3YXM
