|
- 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
- jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
I am learning about Amateur Radio so as I can go for my foundation licence but I was on CB back in the days, a channel nine monitor and used the 10 code and the Q code but all I can see is the 73
- digital modes - How do you log (or not) busted FT8 QSOs? - Amateur . . .
Since it is "technically" a complete QSO I log it (in DXKeeper) but don't upload to e-qsl or LotW unless the other party does If he does, I'll upload: if he doesn't I assume he has it as incomplete I think this saves a lot of time later, looking up the QSO details in the txt log! Some folks simply don't bother with "73" 73 Dave - K1DJE
- How does one read a ferrite datasheet? - Amateur Radio Stack Exchange
For example, Fair-Rite's 73 material: What's a μ′s μ s ′ and a μ′′s μ 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?
- End-fed wire antenna lengths - Amateur Radio Stack Exchange
I want to use an end-fed wire antenna, but what would be the best length of wire for the 20m and 40m bands? Is there a way to work this out? This is assuming a tuner will be used
- How does VHF UHF propagate beyond the expected (radio) horizon?
Here is a quote with a short reference about this from Engineering Considerations for Microwave Communications Systems (GTE Lenkurt, Inc, 1970): "The effect of man-made obstacles depends entirely upon their shape and position, Microwave- transparent objects, which are few, are ignored A large round container such as a gas storage reservoir, if partially in the path, causes both diffraction
- Calculating Antenna Length on the FCC Exam vs. in Reality
Or is it none of the above? I believe the US FCC Technician class exam requires the use of 468 f Are any of these equations helpful in calculating antenna length in reality, or is this only in theory for the exam? What additional factors should be taken into account, if any? What would be a better equation if none of the above?
- How can one convert from Lat Long to Grid Square?
I see that many contests, awards, and other items, use Grid Squares as a means to identify where one is How can one figure out what one's grid square is, given lat long?
|
|
|