Why do hams often conclude messages with "73"?
Oct 25, 2013 · 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 …
jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
Aug 16, 2021 · 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 …
digital modes - How do you log (or not) "busted" FT8 QSOs?
Oct 24, 2021 · 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 has …
Antenna matching for a dipole - Amateur Radio Stack Exchange
Apr 5, 2025 · I am following 50ohm matching until balun and after that 73 ohm everywhere. Just looking at the two branches of your antenna: I'm not sure I'd say you're "violating" anything, …
CW: when I supposed to send "E E"? - Amateur Radio Stack …
Jan 8, 2020 · I'm new to CW and one thing I couldn't figure out is when I supposed to send "E E". Let's say I'm calling CQ and somebody answers me. The QSO is almost over. Should it be …
How does one read a ferrite datasheet? - Amateur Radio Stack …
For example, Fair-Rite's 73 material: What's a $\mu'_s$ and a $\mu''_s$? What do these numbers represent, and how can I use them in amateur radio? Do they allow me to predict inductance …
procedure - CW contact content - Amateur Radio Stack Exchange
Jan 11, 2015 · In the end, we have 73, which is commonly used. Then there's the procedural part. I send SK, meaning that I'm ending the conversation and I send CL, meaning that I'm closing …
Coaxial Folded Dipole Antenna Matching Impedance
Apr 22, 2015 · The site above depicts a regular dipole, with a simple matching system. First, a bit about dipole impedance. The impedance of a dipole is 73 Ohms at resonance, but away from …
How can a half wave dipole which has an impedance of 73 + j43 …
Dec 9, 2019 · 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 …
How to estimate a dipole feedpoint impedance? - Amateur Radio …
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 …