Hi Stefan The mains has just to supply the losses. So the critical parts are the FETs and the loop wire diameter. I think 100 A rms is a problem for most loops. But i would give it a try. Even the
Hi Rik I think I missed a message or two. What current level is the consensus for 100W input at 9KHz into a reasonable loop? I missed how this was modeled and wonder if my original assumptions where
But, unfortunately, i think there is another problem: If you try that with your loop, who will be the next receiving station? What distance? Even if you run 100A rms into that loop (BTW, what is the
Hi Guys Nothing of note in the log here for the timings in Jean-Pierre's grab. 73 Scott VE7TIL See on the picture , copy last night on my grabber ( no ident ! ) 73 Jean-Pierre F1AFJ Le 29/03/2011 15:
Hi Rik / Piotr Thank you for taking the time to consider this and provide some very useful information. I'm going to tackle this project in stages: 1) Build a smaller h-bridge TX say on the order of
Hi Roger The practicality of pumping 35A into a loop is not an easy task! Couple this with the stability of most capacitors creates a real engineering challenge for a loop on 9KHz, notE the BW and Q.
Hi Roger Yes! It is as that's how we discover new things! The practicality of a loop would depend on its size and the tuner design. Stable caps would be needed and these caps would be very expensive
Hi All The VE7TIL LF grabber is offline for a couple of days for testing on 9KHz. Presently testing with 50W into my 1/2km Earth loop. 8.970KHz GPS disciplined. Great results with the Earth antenna o
Hi Roger Good stuff! In my recent experiments on 9KHz Earth mode I discovered my laptop's on board sound card was very noisy particularly when operating off battery. As a result, I added a quality US
Hi Joe Maybe IC doesn't trust you to behave, you have a reputation you know ;-) 73 Scott VE7TIL I have tried for a year without luck to get authorisation to transmit below 9 kHz. Even though this por
No worries Stefan. That's what makes having a group interested in the same topic so powerful. We all contribute ideas and materials and eventually we all sort it out. Very interesting stuff thanks fo
Hi Rik I would like to play with Spectrum Lab's digi-terminal modes to experiment with various baud rates over different distances. Any advice from your experiments? TU Scott On 4/21/2011 10:46 AM, R
Hi All I wonder if someone can explain to me how to feed an MSK signal into a typical Class D transmitter? I mean by typical that the TX has a 4013 type /2 system feeding two FET drivers to drive FET
Hi Andy Holy mind bogglingness batman... Here's the parameters to make this real simple: - I want to generate a MSK signal out of the transmitter at 8970Hz. - I'm using Spectrum Lab, which allows me
Hi Stefan/group This looks it may be the link or at least a very interesting one: http://www.navy-radio.com/manuals/0101-1xx/0101_113-02.pdf 73 Scott VE7TIL Am 12.04.2011 23:30, schrieb Stefan Schäfe
Hi Stefan I don't see a reference to the graph in this document. Wrong link? Thanks, Scott VE7TIL Am 12.04.2011 23:30, schrieb Stefan Schäfer: VLF, I've just got these graphs by a SWL (or better LWL)
Thanks Andy! Sanity check now complete. I did as you described before I asked the general question and strange things happened... I'm going to need to double check what I was doing to ensure I didn't
Mal Mal Mal... Taking your logic to the next level, you'd be just as screwed as the rest of us as your appliances consume power and with the grid zapped you won't be using your tube rig very long on
Hi All Last evening and this morning was a very active time on VLF which resulted in some interesting recordings of whistler and chorus activity. As a side note, DHO38 has been noted for the first ti
