Ok, for MONOband use only, what about a simple parallel resonant circuit, consisting of a solenoid coil of 50 ohm coax + parallel resonating fixed or variable cap, or padding a variable cap ? With ca
I'm pretty sure some of the common mode choke approaches do exactly that ... except using the stray capacitance between the shields of the turns to get the resonance. I suspect there are websites sh
Ancient reference for aircore baluns: http://www.k1ttt.net/technote/airbalun.html David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: 145.69MHz or telnet://k
That's exactly the chart I remember seeing. Thanks for resurrecting it! Dave AB7E David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: 145.69MHz or telnet:
Jim, Take a look at the resonant breaker. It has been in the ARRL books since at least the 90s, and I seem to remember it in the 80s books as well. https://www.arrl.org/files/file/Technology/tis/info
And not a very good one, because it fails to consider the common mode circuit of which it is a part. 73, Jim K9YC _______________________________________________ _____________________________________
To convert those Mag and Phase values to Complex Impedance (aka Choke Impedance) you can use next calculator (Excel spreadsheet): http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Calculadora_I
<And not a very good one, because it fails to consider the common mode <circuit of which it is a part. <73, Jim K9YC did NOT depict the exact freq of resonance. But the concept works, with extreme hi