losses are sufficient that the magnetic circuit isn't very close to ideal. Well that particular case was just talking about how it's a bad idea to wind your common mode choke using widely seperated
Okay, here's my problem. I know I don't know this stuff. But I've tried to read everything I can find on the web. Including Jim K9YC's excellent amount of information at his website. But then I read
A recent eHam thread generated 18 pages and 175 postings on this same topic, including hot debate over Jim's claims that bifilar windings caused several dB loss: http://www.eham.net/forums/Elmers/216
It's probably not a big deal if an antenna is slightly unbalanced and there is some resulting common mode current on parallel wire line, if the circuit transforming the parallel line Z to 50 ohms unb
Looking at this document "Heat Dissipation in Electrical Enclosures" and a nice graph on heat dissipation vs total surface area for airtight enclosures, it would seem to me that: 1) assuming .1 db lo
Rob, Unfortunately you wont be sure! The MFJ meter only compares the magnitude of the current in the two wires; crucially it doesn't look at the phase. So when the meter indicates "balanced" any one
YES! The key issue is dissipation. BUT: A robust coaxial choke (that is, very high resistive impedance at the operating frequency) will dissipate very little power because it reduces common mode curr
If you wanted to test your design, a 60 or 100W lightbulb makes a decent test source. ACtually, you'd probably get significant convective transfer. If you could fill the enclosure with oil or pot it