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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
- 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
- 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
- How to estimate a dipole feedpoint impedance? - Amateur Radio Stack . . .
An ideal dipole, at resonance, will have an impedance around 73 ohms A folded dipole, around 280 ohms How can I calculate the impedances when not at resonance? Let's assume I have a span of 15M
- How does one read a ferrite datasheet? - Amateur Radio Stack Exchange
For example, Fair-Rite's 73 material: What's a μ′s μ s ′ and a μ′′s μ 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?
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