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. …
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: …
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 …
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 …
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 …
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 …
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 …
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 …
Using NanoVNA to tune antenna - Amateur Radio Stack Exchange
May 14, 2023 · Since my body will attenuate the signal, I plan to thread extra long wire through my gear, and use the NanoVNA to trim the cable bit by bit to tune it to my needed frequencies in realtime. I …
baofeng - Squelch breaks but no sound - Amateur Radio Stack Exchange
Nov 10, 2024 · Otherwise, so you don't get frustrated just searching for frequencies, go to radioreference.com and look for amateur radio frequencies and repeaters near you. That will give …