Why do hams often conclude messages with "73"?
Oct 25, 2013 · "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 …
jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
Aug 16, 2021 · 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 …
CW: when I supposed to send "E E"? - Amateur Radio Stack …
Jan 8, 2020 · First, some history. As I understand it, the "dit-dit" (E E) comes from an old practice. There is a short tune in popular music that was often used to end a musical performance in a …
antenna - What happens if I “open” a folded dipole so that the two ...
Half wave is around 73 ohms, folded is around 292 ohms. That's why you can feed one directly from 300 ohm twin lead, and even make one from it like those old FM radio antennas. …
Antenna matching for a dipole - Amateur Radio Stack Exchange
Apr 5, 2025 · There is a 433 MHz-438 MHz transceiver terminated at 50 ohm. The transceiver output is connected to 50 ohm:73ohm Balun, and from balun to two dipoles. 73 ohm balun is …
digital modes - How do you log (or not) "busted" FT8 QSOs?
Oct 24, 2021 · 73 Dave - K1DJE. Share. Improve this answer. Follow answered Oct 24, 2021 at 18:18. Dave Dave. 81 2 2 ...
Understanding how antenna mismatch can damage a transmitter
Nov 1, 2023 · 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 …
What was the origin of the Morse code abbreviations "hi" and "es"?
Dec 6, 2017 · In Morse code, hams use "hi" to indicate a laugh, and "es" to mean "and". Where did these abbreviations come from? Both being all dots, they are short and easy to send and …
How does one read a ferrite datasheet? - Amateur Radio Stack …
Datasheets for ferrite materials are usually filled with incomprehensible graphs with greek letters. For example, Fair-Rite's 73 material: What's a $\mu'_s$ and a $\mu''_s$? What do these …
How to estimate a dipole feedpoint impedance?
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 …