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  • Why do hams often conclude messages with 73?
    Looking at amateur radio forums and email threads, oftentimes amateur radio operators will use "73" or "73s" where one might otherwise expect to find "Sincerely" or "Regards" Why?
  • 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
  • How does one read a ferrite datasheet? - Amateur Radio Stack Exchange
    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 or losses of inductors made on cores of this material? What is the relevant math?
  • 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)
  • How can a half wave dipole which has an impedance of 73 + j43 ohms ever . . .
    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 manner of matching devices could be added to the antenna, and considered as a whole, they would make a resonant system But that's not what people usually mean when they say "resonant antenna" Instead, the antenna can be made
  • Hottest jargon Answers - Amateur Radio Stack Exchange
    None of the above There are no "73 codes" like 10-codes, 73 is just 73 Yes, I know about the 92 code, but it's well and truly dead, with no survivors other than 73 and occasionally 88, so
  • 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!
  • 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
  • Core mix preferences for a balun (or unun) vs a choke
    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’ factors for the 1 KHz to 1 MHz frequency range





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