Alberto, To wind such a transformer you can use the Amidon FT50-J core with an initial permeability of 5000. for a 10 kHz bottom end you will need about 17 turns for a 50 ohm source/load. For the oth
I had similar experience with the 0830/0845 Z transmission. I set up out in an isolated field using a battery operated Wandel Goltermann AT463 selective voltmeter for a receiver set for high impedanc
LF Group, I think Jim has it pretty much right. I would add the point that the ground and shielding will not improve the signal strength much if at all. What it can do is improve the depth of the rej
Hi, I have similar good experience with the NRD-525. My only comment is that the display and microprocessor can generate some false signals which are down near the noise threshold aurally but can sho
Markus, I have scanned the manual for the Efratom FRS rubidium standard. I could send it to you if that would be helpful in your quest. It is 1.3 MB in size. Frank K0BRA Hi ... I got a Rubidium Freq
Let me add a few tidbits here as a nice discussion on sea gain seems to have begun. At 24 kHz, vertically polarized signals become pretty much unreadable with the best technology about 25 feet under
Peter, AMRAD conducted several winter trips to the Outer Banks of North Carolina to listen to LF signals in the days before transatlantic amateur signals were common. The Outer Banks are a long narro
