Why do hams often conclude messages with "73"?
Oct 25, 2013 · 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 …
digital modes - How do you log (or not) "busted" FT8 QSOs?
Oct 24, 2021 · 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 …
CW: when I supposed to send "E E"? - Amateur Radio Stack …
Jan 8, 2020 · 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 …
How does one read a ferrite datasheet? - Amateur Radio Stack …
For example, Fair-Rite's 73 material: What's a μ ′ s μ and a μ ″ s? What do these numbers represent, and how can I use them in amateur radio? Do they allow me to predict inductance …
Coaxial Folded Dipole Antenna Matching Impedance
Apr 22, 2015 · The site above depicts a regular dipole, with a simple matching system. First, a bit about dipole impedance. The impedance of a dipole is 73 Ohms at resonance, but away from …
Are there formulae to calculate capacitance and inductance of an ...
I assume you are referring to the feedpoint resistance and reactance. Stearns, K6OIK, Antenna Impedance Models, presented at ARRL Pacificon 2004 is an excellent treatment of the …
Dipole increased CM current using choke balun - Amateur Radio …
Aug 23, 2019 · I've read that an inverted vee lowers the 73 ohm dipole impedance closer to the 50-ohm coax impedance but connecting a coax unbalances the antenna, so I wanted also to …
Antenna tuning confusion - help! - Amateur Radio Stack Exchange
Aug 21, 2023 · A dipole antenna in free space ( no ground effects like capacitance or wire resistance) is 73 ohms. So if you had a dipole, @ a specific frequency, terminated into a 1/2 …
What would be the typical received power of an "S9" signal?
The Wikipedia S Meter article cites: IARU Region 1 Technical Recommendation R.1 defines S9 for the HF bands to be a receiver input power of -73 dBm. This is a level of 50 microvolts at …
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 …