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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
  • 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!
  • Dipole increased CM current using choke balun
    I've read that an inverted vee lowers the 73 ohm dipole impedance closer to the 50-ohm coax impedance but connecting a coax unbalances the antenna, so I wanted also to test using a current choke balun I studied How to determine number of turns for a 1:1 balun? Within that post, I found How to detect common-mode currents or “RF in the shack”?
  • 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 15M
  • 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
  • How does one read a ferrite datasheet? - Amateur Radio Stack Exchange
    For example, Fair-Rite's 73 material: 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?
  • How often are we required to send our callsign?
    Amateurs on the radio and online tell us we MUST ID at the start of our transmissions A couple of hams on 75m sometimes take me to task for not saying my callsign right away 'The FCC says so'
  • united states - Are we allowed to use ISM bands for broadcast radio . . .
    ISM bands are unlicensed for Part 15 compliant devices, which include some communication devices, but broadcast audio or video programming, intended for the public, for entertainment or information dissemination, is not allowed in Part 15 (Broadcast services and other commercial services are explicitly defined in 47 USC Parts 73 through 79, and those services and usages are not allowed in any
  • How to connect a David Clark headset to a Yaesu FT-710
    I have a question that I need a person a lot smarter than me (l’m a retired Firefighter not an electronic engineer) I found an article on how to hook up a David Clark H3340 headset to a Yaesu FT-1
  • antenna construction - What kind of crimp part is used for stress . . .
    I like the way that the person provides stress relief for the dipole antenna wire in the following image However, I cannot figure out what kind of crimp quot;device quot; they are using for maki





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