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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
- 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
- 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)
- 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
- 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!
- How to measuring ferrite core efficiency vs frequency
To help identify a mystery ferrite core mix, the most common method is to take some measurements to determine the initial permeability (µi) Then compare your results to a table of µi for common core materials This will put you in the ballpark and likely more than close enough to make an educated guess about the application (s) the ferrite core would be usable in The ferrite core's
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