HANDHELD TRANSCEIVER
Handheld transceiver commonly known as walkie talkie otherwise known as handy are commonly used by HAMians to communicate in HAM frequency which is portable and it is two way radio. It was developed by during Second world war mainly first by Mr.Donald hings and then by teams at motorola. First developed Handheld transceiver used vaccum tubes, Whip antenna and powered by high voltage dry cell batteries.
Popular Handheld transceiver manufacturing companies are YAESU , BAOFENG.
Handheld transceiver works in half way duplex mode. Different models differ mainly in range, operating bands, filters ( which filter harmonics).
WORKING OUTLINE:
The process involved in handheld transceiver differ from model to model as they involve different features.
This shows important blocks of a general Handheld transceiver. In Receiving process the when PTT is pressed the antenna converts EM signal to electrical signal then amplified , mixed with signal from oscillator , filtered , amplified mixed again to produce Intermediate Frequency (IF) fed to speaker. The process happens reverse in Transmitter mode.
SWITCHING BETWEEN TX , RX
Using Handheld transceiver is simple first set the frequency to receive signals( Receiving mode) and press PTT( push to talk) to Transmit.
MAIN COMPONENTS:
Handheld transceiver use whip antenna because it is compact and has omni directional radiation pattern so less energy is transmitted in vertically upside which is wasted. The signal processing are done by amplifier,tuner, microcontroller,transceiver chip like AT1846S. Powered by rechargable chemical batteries made of lithium ion, NiMH, lithium polymer. Range of power needed vary from 1W to 8W
COMPARISON WITH BASE STATION:
Comparing with base station which is stationery it is movable less power but range is less
WHO CAN USE?
Restrictions depends on frequency and country.
Commercial license is necessary for using commercial Handheld transceiver. One can use Handheld transceiver in HAM frequency after getting HAM license.
ADDITIONAL FEATURES:
Nowdays Handheld transceiver include additional features that were not present in first made Handheld transceiver such as NOAA weather alerts, Memory channels, head phone jack, bluetooth, SOS alarm etc.
Handheld transceiver commonly known as walkie talkie otherwise known as handy are commonly used by HAMians to communicate in HAM frequency which is portable and it is two way radio. It was developed by during Second world war mainly first by Mr.Donald hings and then by teams at motorola. First developed Handheld transceiver used vaccum tubes, Whip antenna and powered by high voltage dry cell batteries.
Popular Handheld transceiver manufacturing companies are YAESU , BAOFENG.
Handheld transceiver works in half way duplex mode. Different models differ mainly in range, operating bands, filters ( which filter harmonics).
WORKING OUTLINE:
The process involved in handheld transceiver differ from model to model as they involve different features.
SWITCHING BETWEEN TX , RX
Using Handheld transceiver is simple first set the frequency to receive signals( Receiving mode) and press PTT( push to talk) to Transmit.
MAIN COMPONENTS:
Handheld transceiver use whip antenna because it is compact and has omni directional radiation pattern so less energy is transmitted in vertically upside which is wasted. The signal processing are done by amplifier,tuner, microcontroller,transceiver chip like AT1846S. Powered by rechargable chemical batteries made of lithium ion, NiMH, lithium polymer. Range of power needed vary from 1W to 8W
COMPARISON WITH BASE STATION:
Comparing with base station which is stationery it is movable less power but range is less
WHO CAN USE?
Restrictions depends on frequency and country.
Commercial license is necessary for using commercial Handheld transceiver. One can use Handheld transceiver in HAM frequency after getting HAM license.
ADDITIONAL FEATURES:
Nowdays Handheld transceiver include additional features that were not present in first made Handheld transceiver such as NOAA weather alerts, Memory channels, head phone jack, bluetooth, SOS alarm etc.
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