73 mapped to best regards or my compliments and was intended as a general valediction for transmitted messages Let's compute the current at the feed point of a dipole at resonance, this is found with the input power (100 watts) and the feed point impedance It is still used for that purpose today in morse code transmissions and often makes its way.
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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 The best thing to do is to listen for a while, and notice which stations are being responded to Sometime operators will prematurely respond with their callsign, without waiting to hear if the other station has finished broadcasting
It's about %80 timing and %20 luck And, as always, good luck and 73! What's a $\mu'_s$ and a $\mu''_s$ What do these numbers represent, and how can i use them in amateur radio
Do they allow me to predict inductance or losses of inductors made on cores of this material
What is the relevant math? There is an unknown ferrite toroid I would like to figure out whether it can be used in an audio transformer, or maybe in a 1:4 transformer on given hf frequency The experiment i came up with is
Although correct based on a free space dipole impedance of 73 ohms, i would suggest that very few practical dipoles are close to this based on the typical proximity to ground and the slanting, inverting or angle of placement Especially on 160m and 80m. When the dipole is too short, its reactance will be capacitive When it's too long, inductive
The exact amount of shortening depends on the thickness of the wire
0.41λ sounds like a reasonable estimate. I studied how to determine number of turns for a 1:1 balun? 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 subject
Many of the calculations in the reference use this as the baseline for computation. Here i am going to use a resonant $\lambda$/2 20m dipole driven by 100 w as the model
