The use of outdoor knowledge: outdoor camping goods
communication tools recommended time: 2011 -
Source: network author: < p> a outdoor tent, general outdoor activities, the commonly used communication equipment is introduced: < / p> < p> handheld radio walkie talkie, typically less than 5 watts of power, very suitable for personal use.
< / p> < p> 2, common band: < / p> < p> VHF frequencies, the frequency range of typical about 136 ~ 174 MHZ, can be subdivided into high, medium and low three segments.
< / p> < p> UHF frequency band, the frequency range of typical about 400 ~ 470 MHZ, can be subdivided into high, medium and low three segments.
< / p> < p> CB spectrum, frequency range at about 25 ~ 35 MHZ, belong to high short wave period.
< / p> < p> the VHF and UHF frequency waves is given priority to with line-of-sight linear transmission, within the scope of the biggest calls a 'visible' can pass, calls both high selection and the line of sight without blocking the place to get the best results.
In case of bad results can try around before and after the move position, generally there will be improved.
< / p> < p> HF high diffraction ability is better than that of VHF/UHF frequency band, and can use the ionosphere reflection for hundreds of kilometers to two thousand kilometers between cosco distance communication, but also the same as the V/U band cannot guarantee in the case of such as mountain peaks, cut off completely reliable.
< / p> < p> three, walkie-talkie basic operations: < / p> < p> 1, equipped with batteries and confirm the lock with the fuselage.
< / p> < p> 2. Check the antenna, confirm the good contact.
< / p> < p> 3, boot.
< / p> < p> 4, set or check frequency (
, should make the machine and the team (
Other radios in a frequency (
< / p> < p> 5, set the transmitted power size.
< / p> < p> the first check whether the battery power is enough, such as the emission light when press the launch button PTT (
Flashing that power is insufficient, this time with high-power launch will make the last point immediately run out, at this point the best immediately replace the batteries.
In the case of can keep in touch, should try to use less power, in order to maintain a long time.
< / p> < p> 6, dispatch noise threshold SQL knob to just not 'sasha vujacic' the location of the noise.
< / p> < p> noise SQL knob too deep, will miss a weak signal, shortening the distance between calls, should be pay attention to.
< / p> < p> 7, press the launch button PTT, and the team (
Intercom test pass, set the volume at the same time, to send and receive is normal after can be put into use.
< / p> < p> 4, frequency and antenna selection: < / p> < p> principle is as follows: the frequency resource is limited, frequency allocation, drawn up by the national radio management committee must abide by the laws when using communication equipment.
The importance of different communications business is different, in the use of different frequencies have different permissions.
In the communications equipment used in outdoor sports must be careful not to cause interference to other communication business, don't put the frequency set on other business in using frequency.
< / p> < p> on not with a conflict situation, depending on the model to determine the frequency.
Intercom is which spectrum, frequency is set in that, and must be with this frequency band (
The distinction between attention including section)
Antenna, so as to ensure the highest receiving power output radiation sensitivity, highest efficiency, in order to get the maximum range.
Do not mix the antenna of different frequency band, the majority of antenna appearance is very close, but the performance may be poor.
< / p> < p> common interphone antenna points short of rubber antenna and long rod antenna.
Usually the use of the telescopic antenna effect better than rubber antenna, but there is no rubber antenna short and portable.
Conditional can both match, timely.
< / p>
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