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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
- 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
- Antenna matching for a dipole - Amateur Radio Stack Exchange
The question is whether the approach is OK or am I violating the design for dipole? The two elements of dipole are around 6cm away from each other 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
- 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 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!
- procedure - CW contact content - Amateur Radio Stack Exchange
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 down my station The other side will provide a similar transmission Sometimes, at the very end, people will send E E and E after the final official relation
- Understanding how antenna mismatch can damage a transmitter
Antenna impedance is largely due to radiation resistance: a center fed half wavelength dipole has a radiation resistance of about 73 ohms Resistance due to heat loss is negligible, and I believe reactance negligible as well Let's say we have an oscillator consisting of a 1 MHz voltage source (30V RMS) in series with a 75 ohm resistor
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