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 them to numbers. …
What is the impedance of an end-fed half-wave antenna?
Theoretically, (73 + j42.5)Ω. When the dipole is too short, its reactance will be capacitive. When it's too long, inductive. Since the exactly half-wave dipole has a slightly inductive reactance, shortening it …
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 the resonant …
CW: when I supposed to send "E E"? - Amateur Radio Stack Exchange
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 ended like this: …
What's 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. Sometimes operators will prematurely respond with their callsign, without waiting to hear if the other station has …
receiver - Discrete-Component Mixer design - Amateur Radio Stack …
Dec 9, 2024 · I was building a radio receiver for FM waves (87.5-108MHz), I want to build every block on my own (oscillators, mixers, demodulators) and then put them together. I was now designing a mixer …
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 …
Prudent power limits for SSTV on my Yaesu FT-710
Mar 7, 2025 · I recently added a Yaesu FT-710 to my setup. I do some FT-8, and I found guidance from Yaesu posted online that said that 50 watts is an appropriate power level for FT-8 on this radio, but …
Low power indicated on tuner - Amateur Radio Stack Exchange
Aug 21, 2023 · Also I had a ridiculous mistake, auto tuning was turned on on my transceiver as well as on my tuner. Disabling it on the transmitter further helped to get a lowe SWR matching. Dumb …
Is it possible to transfer an area-specific call sign from a deceased ...
May 17, 2015 · Is there any sort of familial transfer process that could get that call assigned to me in California? There are 3 types of vanity call sign requests: Primary station preference list Close …