I've never seen 51's used as a term. It may have siginifance, like 73's does, going back to the telegraph era. 73 has morphed over the telegraph era to become "Best Regards", which is why it's still commonly used.
51's is very similar to 73's. It is simply in another language (Latin I believe). When translated back to English the closest translation you get is "wishes". In C.B. radio it started becoming widely used by Single Side Band radio clubs due to a C.B. radio magazine columnist signing off his DX report with 73's and 51's. wishing you "best regards"(73's) and "good DX"(51's). In amateur radio there is a rare German communications guide where it is documented and it means "take care" and don't get caught!(by the "radio police"). That was the closest translation I could get from a German radio operator belonging to a club called the European Radio Group out of Witten, Germany. There is also, from this communications guide the term "55" meaning "lots of success" and "66" meaning God bless!... hope that helps
73!
It is used in ham radio terms as a term for the wife of the ham operator.
Probably from 'Amateur', (Hamateur). In the same way that amateur actors are known as Ham or hammy.
The term 'ham' in ham (or amateur) radio comes from before radio was ever invented; it was used in wire telegraphy to denote an unskilled or inefficient telegraph operator. The original meaning has been completely lost since the term's adoption by amateur radio operators, and no longer implies the operator is an idiot.
Impedance is not unique to ham radio and applies to all electronics. Impedance is a property of electrical circuits that can impede the current from flowing.
You may have a Ham radio antenna anywhere in the US, unless there are restrictions as to its placement, such as in a condo or apartment. If you meant a Ham radio transmitter, then you must have a Ham license to operate it.
You are thinking of a "hamlet" which does mean a small village. But the word "ham" often refers to a food that comes from a pig; or it can be a slang word that means a person who is a show-off and acts in a conceited way; or it can refer to somebody who is involved in the hobby of amateur radio-- such a person is called a "ham radio operator."
There is no scientist named Ham in ham radio. The term was first an insult, like "ham-fisted" (clumsy) or "ham actor" (bad stage actor). Then the radio operators decided to take the name as a source of pride, and found three radio pioneers to say it was named for: The H is for Heinrich Hertz, who did a lot of work with radio frequency energy and for whom the measurement of frequency is named. The A is for Major Edwin Armstrong, who invented frequency modulation. Apparently no one else was available because FM wasn't a popular mode in the amateur service when they borrowed his name. The M is for Guglielmo Marconi, who invented the radio.
Ham refers to someone who builds or operates radio transmitters or transceivers as a hobby. It can also refer to someone who communicates in a way that implies he or she is seeking attention.It means that the person enjoys being in the spotlight and has an inflated opinion of his acting abilities.
Amateur radio, often called ham radio, is both a hobby and a service in which participants, called "hams," use various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training. But we still don't know the origin of the word HAM.
Amateur radio, often called ham radio, is both a hobby and a service in which participants, called "hams," use various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training.[1] Amateur radio operators enjoy personal (and often worldwide) wireless communications with each other and are able to support their communities with emergency and disaster communications if necessary, while increasing their personal knowledge of electronics and radio theory. An estimated six million people throughout the world are regularly involved with amateur radio.[2] The term "amateur" is not a reflection on the skills of the participants, which are often quite advanced; rather, "amateur" indicates that amateur communications are not allowed to be made for commercial or money-making purposes.
Bad ham radio. Bad !
This is a ham radio term. When you sign off, you state your call sign and state that you are through transmitting, and then turn off your radio. The term is now more frequently used in business to mean to agree a document, process or policy. The person senior in the work place responsible for the task would be called upon to "sign off a task" (agree its completed to the standard).