Repeater

Amateur Radio Repeaters

The two meter and seventy cm ham radio bands are the most popular of all of the ham radio bands and it is where most new hams start out. The two meter band is a VHF or very high frequency band and the seventy cm band is a UHF or Ultra high frequency band.

Upon obtaining an amateur radio license or "ticket" generally a hams first investment is in a dual-band hand held two way radio, frequently referred to as an HT or Handy talkie, a term which developed from the old term: walkie-talkie. Customarily the amateur radio operators second investment is in a mobile dual band UHF/VHF transceiver or "rig" which they mount in their vehicle or radio Shack. These two rigs have very similar functionality but the hand held battery-operated rig is usually limited to a maximum output power of about 5 watts. The mobile radio which is connected to the vehicles twelve Volt power supply, or if it used as a base station, to a transformer supplying 12 Volts DC and is capable of transmitting generally up to about 35 watts.

UHF and VHF frequencies are line of sight. Depending on the power output and the location of the transmission aerial UHF and VHF transmissions are able to reach the visible horizon and maybe just a little beyond, but that is the limit. There is one notable exception to this rule which is Tropospheric ducting, where under very unusual and quite rare weather conditions VHF and UHF radio signals travel very much further than the horizon. amateur radio operators take advantage of this phenomena when it does occur by communicating with other hams over great distances.

A 5 Watt Handy-talkie will have an operative range "depending on the terrain and elevation" of roughly 3 miles. A mobile rig on full power with a good antenna in a good location will probably have a maximum range of fifteen to twenty miles under favorable conditions. To get over this limitation in range amateur radio operators make use of radio repeaters, which are frequently owned and operated by amateur radio clubs, but some are privately owned. These radio repeaters are automatic transceivers that listen or receive on one frequency and transmit on a different frequency, this is frequently referred to as "the split". The radio repeater takes the signal that it receives on the input frequency and instantaneously retransmits it on the output frequency using a lot more power, generally about a hundred Watts. In addition to the higher power most of these radio repeaters aerials are located on the top of very high towers or high buildings which actually increases it's range.

A ham's Handy talkie can be used to transmit on the repeater's input frequency and receive on the repeater's output frequency effectively increasing the range of the hand held rig to just beyond the horizon, maybe even as far as thirty or forty miles. Many radio repeater systems have several receiving aerials located throughout the repeater's coverage area but just one main transmitter. In this way a large city can be completely covered with a radio repeater system with hams being able to receive the radio repeater just about anywhere in the city and they are able to be received by the radio repeater or "hit the radio repeater" as it is generally referred to, again from almost anywhere in the city.

Recently some repeaters around the globe have been connected to the World wide web and can be linked to each other using the World-wide-web. For example an ham radio operator in Moscow Russia with an Handy-talkie can chat through their local repeater with a fellow amateur who is driving in their car in New York city United States.

Some radio repeater systems are continually linked to each other but most are linked as and when required by the user and the link is dropped at the end of the conversation.

Most amateur repeaters are open to all licensed ham radio operators at no cost. These radio repeaters do take money to buy, operate and maintain. They are usually funded by club membership dues and events held by the club like Hamfests. If a ham finds themselves using a radio repeater frequently then maybe they should really consider joining the club that owns the repeater and help to finance it.

Sell us your new and used: Books, CDs, DVDs, PC and Mac Software, PC and Mac games, Xbox, Nintendo, Sega, Playstation etc video games and some small electronics. Simply email us for a quote then mail us the items that you no longer need or use. We pay fast by PayPal, Check or Cash. No account to open, no logging in, no password.
http://sellit2us.com/ 

Article Source: http://EzineArticles.com/?expert=Carl_Broady

Article Source: http://EzineArticles.com/4733253

Tait Electronics T835 20 T836 20 Repeater RPT30 Series
Tait Electronics T835 20 T836 20 Repeater RPT30 Series
$102.82 (4 Bids)
Time Remaining: 2d 1h 58m
MOTOROLA REPEATER CONTROLLER FOR 16 PIN RADIO GR300 GR400 GR500 UHF VHF HAM GMRS
MOTOROLA REPEATER CONTROLLER FOR 16 PIN RADIO GR300 GR400 GR500 UHF VHF HAM GMRS
$149.99
Time Remaining: 2d 20h 47m
Buy It Now for only: $149.99
RA 2 Repeater Adaptor Motorola GM300 GR300 CDM1250 RICK
RA 2 Repeater Adaptor Motorola GM300 GR300 CDM1250 RICK
$59.99
Time Remaining: 13d 22h 32m
Buy It Now for only: $59.99
ACC RC 850 Repeater Controller VHF UHF
ACC RC 850 Repeater Controller VHF UHF
$202.50 (4 Bids)
Time Remaining: 2d 3h 32m
Vertex Standard VHF Repeater VXR7000 v
Vertex Standard VHF Repeater VXR7000 v
$699.50
Time Remaining: 24d 15h 9m
Buy It Now for only: $699.50
RITRON 7W UHF REPEATER RR454 with duplexer
RITRON 7W UHF REPEATER RR454 with duplexer
$30.95 (2 Bids)
Time Remaining: 3d 32m
New Design VHF UHF Dual Band Mobile Radio with cross band repeat scrambler
New Design VHF UHF Dual Band Mobile Radio with cross band repeat scrambler
$248.00
Time Remaining: 3d 11h 35m
Buy It Now for only: $248.00
Cable123 Motorola 16 Pin Maxtrac GM300 VHF UHF Repeater
Cable123 Motorola 16 Pin Maxtrac GM300 VHF UHF Repeater
$12.49
Time Remaining: 12h 47m
Buy It Now for only: $12.49
HAMTRONICS REP 200 UHF REPEATER ZETRON MODEL 37 REPEATERMAN BOX MANUALS
HAMTRONICS REP 200 UHF REPEATER ZETRON MODEL 37 REPEATERMAN BOX MANUALS
$350.00
Time Remaining: 4d 11h 11m
MOTOROLA REPEATER VHF 140 170 MHZ 2 METER 30 WATT
MOTOROLA REPEATER VHF 140 170 MHZ 2 METER 30 WATT
$289.00
Time Remaining: 1d 55m
Buy It Now for only: $289.00
PR UV7000 Quad Band Mobile  Cross Band Repeater29 50 144 430MHz50W V+UCross
PR UV7000 Quad Band Mobile Cross Band Repeater29 50 144 430MHz50W V+UCross
$299.99
Time Remaining: 1d 16h 19m
NEW BCR 40U FM Repeater UHF 400 470 MHz
NEW BCR 40U FM Repeater UHF 400 470 MHz
$995.00
Time Remaining: 27d 22h 58m
Buy It Now for only: $995.00
RA 2T Repeater Adaptor Motorola RICK MOTOTRBO XPR XPR4300 XPR4350 XPR4500 4550
RA 2T Repeater Adaptor Motorola RICK MOTOTRBO XPR XPR4300 XPR4350 XPR4500 4550
$69.99
Time Remaining: 22d 1h 19m
Buy It Now for only: $69.99
Cross Band Full Duplex Repeater Controller for KG UVD1P
Cross Band Full Duplex Repeater Controller for KG UVD1P
$79.00
Time Remaining: 2d 18h 22m
BR 6070 OMNI DUAL BAND UHF VHF 440 450 144 148 BASE REPEATER ANTENNA MOTOROLA
BR 6070 OMNI DUAL BAND UHF VHF 440 450 144 148 BASE REPEATER ANTENNA MOTOROLA
$99.50
Time Remaining: 16h 59m
Buy It Now for only: $99.50

« Previous1234567