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 …
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 …
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 …
What is the impedance of an end-fed half-wave antenna?
Theoretically, (73 + j42.5)Ω. When the dipole is too short, its reactance will be capacitive. When it's too long, inductive. Since the exactly half-wave dipole has a slightly inductive reactance, …
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 …
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 …
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 …
What's the difference between saying “CQ” or “QRZ” in a contest?
The best thing to do is to listen for a while, and notice which stations are being responded to. Sometime operators will prematurely respond with their callsign, without waiting to hear if the …
What is the peak voltage at the tips of a dipole antenna?
Here I am going to use a resonant $\lambda$/2 20m dipole driven by 100 W as the model. Let's compute the current at the feed point of a dipole at resonance, this is found with the input …
Impedance Matching Different Feedlines - Amateur Radio Stack …
A folded dipole will increase this impedance to the square of the number of parallel elements (for the ultralite sr. with 3 parallel elements, I calculate 9 * 73 = 657 ohms impedance).