Ham Radio Activities
Although a jambon radio does circularize in all direction , hams generally do not habituate their radios in a broadcast kind of fashion as a record jockey would at a radio post . In normal AM or FM radio , one disk jockey transmits and thousands of people take heed . Hams , on the other bridge player , conducttwo - way conversation , often with another ham actor or with a grouping of hams in an informalroundtable . The roundtable of hams may be in the same town , county , province , country or continent or may consist of a mix of countries , depend on the absolute frequency and the metre of the sidereal day . Hams also enter in networks , often callednets , at preset times and frequencies to exchange third - company messages . In the caseful of disasters , hams exchange health and social welfare information with other hams . Some hams use radioteletype ( RTTY ) withcomputer screensreplacing the noisy teletype machines of the past .
Many hams get their start on VHF FM , using shelling - work hired hand - hold transceivers set up to transmit on one frequency and receive on another frequency . They useFM repeatersset up and supported by local radio clubs . These repeaters borrow transmitting aerial space from goggle box - station - tower owner on top of mountains and high construction to incur and re - broadcast signals to extend the range .
The FM repeater receives one signal at a time and simultaneously rebroadcasts it on another frequency using many more W of power than usable from a small paw - held wireless . This extends the orbit of the handwriting - keep wireless from a few mile to ten or hundreds of mi ! The whole country has theserepeaters . ( Listen to one with aradio scannerto learn a lot about jambon radio . ) When a jambon is journey , he or she can find a repeater to use ( great for tips on local eating house ) , and transmit on a nice , static - free , FM - wireless - quality conversation via a radio that suit in a shirt pocket or purse . link repeatersallow play wireless communications across an total state with a hand - held wireless .
Repeaters employ common transmit and have frequency pairs . The frequency pairs in enjoyment are informally assigned by group of jambon so that any frequency yoke in use is far enough from another repeater so as not to cause unwanted interference . Anamateur radio satelliteallows radio amateur employ their hired hand - held radios to put across through the satellite when it is overhead .
Natural disasters like hurricanesandtornadoes disrupt normaltelephoneandcell phonesystems , and gammon wireless operator can pitch in to aid with emergency communications .
On theInternational Space Station , a extremity of the crowd usually has an inexpert wireless manipulator ’s license and sometimes chats with other hams on earth for a few minutes!VHF transmissionshave a terminal point to furrow - of - visual modality communication and commonly do not travel over the apparent horizon , so a conversation is confine to the time when the ISS is overhead .
