Hello Luis, the critical point in measuring ERP is the calibration of the measuring device. Dick, PA0SE published a nice field strength meter for 136kHz and included a calibration method using a pair
I agree, you can buy FT232 absed ready made modules for about 10-15 Euro. 73, Rik ON7YD Van: [email protected] [[email protected]] namens Andy Talbot [andy.g4jnt@gma
Very sad news. I had a lot of QSO's with Peter in the early 136kHz period and in 2008-2010 also a couple on 500kHz. His LF Experiments handbook and RadCom articles were (and still are) a source of in
Hi Chris, for practical (safety) reasons I would place the remote controlled variometer at the low voltage end of the loading coil (before the loading coil, seen from the TX). 73, Rik ON7YD Van: owne
Hello Stefan, I am not sure a (lossless) capacitor in parallel with the coil will lower the antenna efficiency. I would assume that it will affect the antenna impedance as seen from the TX, but will
Hi Chris, your question is not easy at all, unless you want to spend a lot of money. The easy (but expensive) solution would be to buy an appropiate vacuum relay. These can handle several 10kV and ar
I think it would increase the coil losses, compared to a higher inductance coil of same Q, without the capacitor. Pcoil = I*U/Q At same radiated power, you'll have the same voltage but higher coil c
Here too, signal up to -8dB. Pitty I missed him. Anyone interested in another JT9 QSO party one of these days? 73 and HNY to all, Rik ON7YD - OR7T Van: [email protected] [owner-rsgb_
Hello Vinny, it is worth trying. Due to the 1 minute cycle signals are about 3dB down on WSPR, but QSO's are possible far beyond the CW treshhold level. As suggested earlier: what about next Friday (
Hello Andy, the frequency seems a bit odd (477kHz carrier). In the past the digimode (JT9, WSQ, ...) segment was just below the WSPR segment. 474.2kHz dial (USB) and 1200-1400Hz audio. Advantages: -
Hello Dionysios, nice to be copied in Greece. I was happy when one of my CQ's was answered by YO2IS, my 26th DXCC country worked on 472kHz. Can you transmit JT9 as well? It would be nice if you could
Hello Domenico, all, it was indeed nice. I worked DL6II, I5EFO, DC1RJJ, IW4DXW, F4DTL, DG3LV, DK7FC and also copied IZ7SLZ, F6CNI, DF8UO, YO2IS. A pitty that (from my location) there were no >1500km
Hello Szigy, regarding the declared power level in WSPR: Most stations declare their ERP, not PA output. 73, Rik ON7YD - OR7T ________________________________________ Van: owner-rsgb_lf_group@blacksh
Hi Markus, not everywhere! The outcome of WRC-12 was: "The maximum equivalent isotropically radiated power (e.i.r.p.) of stations in the amateur service using frequencies in the band 472-479 kHz shal
John, Andy, indeed: "Administrations may increase this limit of e.i.r.p. to 5 W in portions of their territory which are at a distance of over 800 km from the borders of .. " It is up to the national
Hi Stefan, transmitting 'CQ DK7FC K' will take 78 days, so anyone who wants to reply has to be ready by April 1st ;-) 73, Rik ON7YD - OR7T Van: [email protected] [owner-rsgb_lf_group
it's one of these famous BBC sitcoms from the seventies, together with "it ain't half hot", "upstairs downstairs", "are you being served", "some moms do have them" etc ... But we are way off topic ;-
How does a 2 x 4CX1500 PA and a 1/4 wave vertical fit with the 5 W EIRP limit? 73, Rik ON7YD - OR7T Van: [email protected] [[email protected]] namens Mal Hamilton [g
I left WSJTX running overnight and now noticed some CQ's from OM1II early this morning. If time permits I'll try to be QRV this evening. 73, Rik ON7YD - OR7T
