2013年10月25日 · The usage of "73" for such a purpose comes from the Phillips Code, originally devised in the era of telegraphs to speed up transmission of common messages by mapping …

An ideal dipole, at resonance, will have an impedance around 73 ohms. A folded dipole, around 280 ohms. How can I calculate the impedances when not at resonance? Let's assume I have …

2022年5月10日 · The MnZn ferrite cores (Mix 31, 73, 75) have high permeabilities above 800 µ, have fairly low volume resistivity and moderate saturation flux density. They offer high ‘Q’ …

2015年1月12日 · I received my license and built and tested my first CW transceiver. I've spent the last weeks learning Morse code. Now, time has come to make the first contact. But what is a …

2019年12月9日 · A physically half-wave dipole isn't resonant. As you say, it has an impedance around 73+j43 ohms. Since the reactance is non-zero, it is by definition not resonant. Any …

2021年10月24日 · Since it is "technically" a complete QSO I log it (in DXKeeper) but don't upload to e-qsl or LotW unless the other party does. If he does, I'll upload: if he doesn't I assume he …

A half wave center-fed dipole has a resonant frequency where the input impedance appears to be purely resistive. How can this be, when the voltage and current distribution along the length of …

Datasheets for ferrite materials are usually filled with incomprehensible graphs with greek letters. For example, Fair-Rite's 73 material: What's a μ′s μ s ′ and a μ′′s μ s ″? What do these …

2021年8月16日 · I am learning about Amateur Radio so as I can go for my foundation licence but I was on CB back in the days, a channel nine monitor and used the 10 code and the Q code but …

Model the 1/2 wave center fed antenna using the wire size, altitude, and all location attributes to determine the center fed impedance. divide 600 by the 73 ohms or whatever you calculate the …