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 …
jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
Aug 16, 2021 · 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 …
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 …
How does one read a ferrite datasheet? - Amateur Radio Stack …
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 …
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 …
Antenna matching for a dipole - Amateur Radio Stack Exchange
Apr 5, 2025 · 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 …
How to estimate a dipole feedpoint impedance? - Amateur Radio …
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 …
Core mix preferences for a balun (or unun) vs a choke
May 10, 2022 · 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’ …
How to mark SWL contacts on eQSL? - Amateur Radio Stack …
It is interesting to have SWL reports because i was a SWL when i was a kid in the 50's and receiving distant stations was very interesting, BBC, VOA, Radio South Africa RSA, HCJB of …
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 …