Dear Group, Last summer, my VLF CW signals were copied outside my back yard. Today, using a Marconi XH-100 with a SRA-8 mixer & AD9850/Arduino LO and a National LF-10 preselector, the sigs could be c
Hi Joe, sounds good! At 1.25 km you're still in the reactive nearfield, where signal transfer occurs by capacitive coupling rather than Hertzian wave propagation. In that regime, electric field stren
Dear Group, I tried again to get an LOA for VLF. This time, the response from Industry Canada was favourable: 10 mW 8.0-8.3 kHz. Yesterday, after a few slight rf burns, and thanks to PA0RDT's miniwhi
Is it possible for someone who is not especially enthralled by winding a mile of 0.7mm wire to use an iron core to make a VLF tuning coil? 73 Joe VO1NA
Hi Joe, Fine to hear that you're give it a try. Please, don't ask Industry Canada if the 10mW is RF power of ERP! To get out a real signal on VLF, there is no alternative to a real large coil without
For mechanical and HV reasons i would prefer the normal configuration. I depend on the place you have. If you have a shed near the antenna feed point, i would simple wind 0.4 or 0.5 mm diameter ename
Is it possible for someone who is not especially enthralled by winding a mile of 0.7mm wire to use an iron core to make a VLF tuning coil? 73 Joe VO1NA -- 73 Warren K2ORS WD2XGJ
Joe, good to read this! Regarding the loading coil, I would agree with Stefan that a large multiturn air coil is the best option. A laminated iron core would suffer from excessive eddy current losses
Hello Markus, Interesting post about your coil. If you cut the bottoms out from the buckets, would you have better convective air flow for cooling the coils ? Like a chimney effect. I am starting to
Oh yes, Joe, if you have plenty of forest where you can play VLF games, i would also play with a dipole antenna. That's what i said to Laurence a few months ago. Just install a dipole with say 10 km
... already done: http://df6nm.bplaced.net/VLF/pictures/coil_opened_for_airflow.jpg Actually thought of putting a fan on the top and feed it inductively, but not sure how the motor electronics would
Thanks for the suggestion, Roger. This seems like the best option until a very long piece of wire is found. Your VLF web page is an excellent source if info. Many thanks! Joe VO1NA Joe, Alternatives
Hi Markus, Warren, Stefan, Thanks for the encouragement. My quest for thousands of metres of wire has begun. Stefan's monster coil and Markus' coaxial buckets make me envious. Would it be a good idea
PS: You will easily get 30 kV rms across the coil and on the wire when running say 400W RF power. 73, Stefan Am 25.06.2014 18:30, schrieb [email protected]: Hi Markus, Warren, Stefan, Thanks for the enco
