安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Why do hams often conclude messages with 73?
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 "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 transmissions and often makes its way
- CW: when I supposed to send E E? - Amateur Radio Stack Exchange
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: - TNX FE
- Coaxial Folded Dipole Antenna Matching Impedance
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 frequency the impedance is different At frequencies lower than resonance, i e when the antenna is too short, it is capacitive, and its resistance is lower The Smith Chart is the usual way of plotting this
- 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 can eliminate the reactance The exact amount of shortening depends on the thickness of the wire 0 41λ sounds like a reasonable estimate
- Whats 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 finished broadcasting, another bad habit It's about 80% timing and 20% luck! And, as always, good luck and 73!
- receiver - Discrete-Component Mixer design - Amateur Radio Stack Exchange
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 and i c
- Prudent power limits for SSTV on my Yaesu FT-710
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 that mor
- Low power indicated on tuner - Amateur Radio Stack Exchange
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 mistake on my part Will continue with your suggestions in the upcoming days Appreciate your help sir! 73!
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