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- Why do hams often conclude messages with 73?
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 them to numbers "73" mapped to "best regards" or "my compliments" and was intended as a general valediction for transmitted messages It is still used for that purpose today in morse code transmissions and often makes its way
- jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
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 all I can see is the 73
- digital modes - How do you log (or not) busted FT8 QSOs? - Amateur . . .
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 it as incomplete I think this saves a lot of time later, looking up the QSO details in the txt log! Some folks simply don't bother with "73" 73 Dave - K1DJE
- Antenna matching for a dipole - Amateur Radio Stack Exchange
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, but the model for a "simple" dipole is that the gap between the conductors is zero (or at least very small compared to wavelength)
- Whats 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 other station has finished broadcasting It's about %80 timing and %20 luck! And, as always, good luck and 73!
- 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, shortening it can eliminate the reactance The exact amount of shortening depends on the thickness of the wire 0 41λ sounds like a reasonable estimate
- How does a folded dipole work? - Amateur Radio Stack Exchange
Per the above; although correct based on a free space dipole impedance of 73 ohms, I would suggest that very few practical dipoles are close to this based on the typical proximity to ground and the slanting, inverting or angle of placement; especially on 160m and 80m
- CW: when I supposed to send E E? - Amateur Radio Stack Exchange
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 ended like this: - TNX FE
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