Especially on 160m and 80m. A folded dipole will increase this impedance to the square of the number of parallel elements (for the ultralite sr With 3 parallel elements, i calculate 9 * 73 = 657 ohms impedance). 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.
2 is it possible to block a specific dmr id rx, sort of ignore Speaking of popular md380/390 radios, there is a call alert feature on contact list, but didn't find any information regarding that feature, or how it's supposed to work Yes, i know about the 92 code, but it's well and truly dead, with no survivors other than 73 and occasionally 88, so. So using a 1:1 balun, as you are, at a certain height you may be close to 50 ohms, where at other heights you may be closer to the characteristic impedance of 73 ohms or. 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
And, as always, good luck and 73! Is it possible you are hearing something like 73 wa8bit qrz If so, you are hearing someone ending their previous qso and asking if someone else is calling them It can sound like a statement, but it's really asking if someone else is waiting, in a pileup for instance, rather than calling cq again What do i say when ultimately acknowledged? To begin with, an infinitely thin, 1/2 wavelength center fed dipole in free space has a feedpoint impedance of 73+j42.5 ohms
By slightly shortening the antenna, the reactive component fades away and we are left with a ~73+j0 ohm feedpoint impedance. 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?
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