Spiros, Congratulations! Hideho YAMAMURA, JF1DMQ Hi to all. Last night I had a nice success on LF band. My signal received by JA7NI, Kuni grabber in LF at 136.171,50 KHz. Thank you Kuni and Yas (JA8S
Spiros and all, Great, GL. However, FYI LF activities in JA is expected to be low for a few days, in general. I don't know if this applies to JA7NI's activity. A very strong Typhoon is hitting Japan,
Dimitris and all LF/MF, Yes, in JA, 630m will be permitted at EIRP 1Wmax., effective Jan.05, 2015. Official Directive was published on Dec.17, 2014. however, there are following conditions (I think,
Dear Jan, Thank you for your reply. Never heard of that move in JA. I guess, AM BCs' value is appreciated, after the earthquake and Tsunami disaster in 2011. NDBs are disappearing, but that's another
Dimitris, Nice that you don't hear complaints. That's nice. My quick calculation resulted in -120dBc necessary, to reduce QRM to adjacent houses, (I may be wrong)., and I am thinking how to make it.
Stefan, Thank you for the diagram, nice picture, and that you don't have complaints You have a BPF. It should help a lot, for low harmonics. And your TX is very compact. I was impressed. I hope so. 7
Hello Dimitris-san, we have the same regulation (with grace period now), but, it seems that the ministry was afraid of the actual interference, hence, on site test. In my quick calculation, I assumed
Markus and all, I agree. I would add, AM is receivable with a germanium-radio receiver, a tuned circuit, a diode and a crystal earphone, an easy project for a young, a good introduction to electronic
Hello Marcin, My experience on 2200m seems to agree with Alan's suggestion. I buried 6 sections of 30cm wide copper mesh at about 20cm deep, 10 to 15m long, totaling about 70m. My first experiment wa
Peter, Nice to know that Ebino, Japan, 22.2 kHz, was received in EU. Found by a quick Google search, located in south Japan, Ebino-city, Miyazaki, Japan, with 500W output, four (pair) towers of heigh
Stephan and all, You might be interested in the following, although not Rogowski type, a cut toroidal core, clamp-type, current transformer + rectifier. You need a high-impedance voltmeter. A normal
Hello Stefan, Did you try feeding with battery ? Also, an isolating-transformer between the power-feeder and RX ? I experienced 1-2dB drop of noise level with the battery, and small improvement with
hello George DU1GM and all, now JA7NI is transmitting on 137.779 DFCW, since 02:26UTC, it's 03:50UTC now, and continuing. George, looks like your grabber is silent now. Appreciate if you can switch i
hello George, That was unfortunate, but great, I noticed you're back. re WSJTX, a lot of thanks go to Joe. WSJT-65 gave me EME QSO. Now, I am excited to experince WSJTX on LF, but long way to go for
hi Dimitris, unfortunately, he stopped his transmission at 03:51 UTC, just after I sent my mail, and I don't know how regularly he plans to transmit. pse check; http://www003.upp.so-net.ne.jp/JH1GVY/
Hello George, Nice to learn about your Grabber. For us JAs, it will certainely be a very good indicator of tranmitting performance. Thank you !! My 136kHz TX antenna is temporary down for improvement
hello all, again, JA7NI is transmitting on 137.779 DFCW, since 05:31 UTC, (about 25 minutes ago). you can check his signal on JA Grabbers, http://www003.upp.so-net.ne.jp/JH1GVY/ja-grabbers.html Hideh
Graham, We have no liscense on 500kHz nor 477kHz in Japan. We expect 477kHz next year. I know JA6EH is active on 136kHz. Did I answer your question ? Hideho YAMAMURA, JF1DMQ Showing as 500 ? is this
