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THE LIRA ANTENNA UHF-TV

The original design of the balun device, protected by patent, contains a bandpass filter, which is well agree on the antenna cable in the operating frequency range, reduces noise at its output and provides reliable lightning protection TV. This design of antenna is designed for reception of television decimeter waves (UHF) frequency range 470-862 MHz, allows us to keep the analog (21-69к)and digital (DVB-T/T2) signals. The antenna is passive and does not have a built-in amplifier in this regard does not require electric power 220 volts. If you need to increase the level of the received signal external power amplifier can be installed separately.

 

лира_enl.jpg

 

 

ELECTRICAL PARAMETERS

Frequency range, MHz 470-790

The wave resistance, Ohm 75

The gain (KU), dB 9,5-11

Beamwidth The level –3dB, deg
In the horizontal plane 80-60 deg
In the vertical plane 55-40 deg

The coefficient of protective action, dB, more 20

The standing wave ratio (VSWR), <1,5

Maximum power, Втv 100

Polarization horizontal

Connector type F

 

DESIGN PARAMETERS

Overall dimensions, mm 520х340х140

The material of the emitters-anodizing aluminium

The material of the protective screen - hot galvanized steel

Material mounting brackets -hot galvanized steel

Weight of antenna with mounting bracket, g 340

The diameter of the prop, hold the mounting bracket, mm 15-55

The maximum wind speed, km/h 160

 

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Anyone here try to add an external antenna to an frs walkie talkie? Just wondering if its possible and if it is how is the best way to do it and does it work good? Thanks

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2 hours ago, BradleyAmirl said:

Anyone here try to add an external antenna to an frs walkie talkie? Just wondering if its possible and if it is how is the best way to do it and does it work good? Thanks

Any LONGER (more GAIN)antenna (for the Fr of interest , and BW , would get you Longer distances) you should start a Thread on this...(I used to connect two uhf 4w handys close to 20km away) making'em new antennas...

Edited by clanon

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On 6/11/2020 at 3:25 PM, clanon said:

Любая БОЛЕЕ ДЛИННАЯ (с большим коэффициентом УСИЛЕНИЯ)антенна (для Fr , представляющего интерес , и BW, дали бы вам большие расстояния) вы должны запустить нить на этом...(Я использовал для подключения двух uhf 4w handys близко к 20 км) создание новых антенн...

Приветствую тебя, Джоми! У меня есть вопрос. Антенна вроде "Лир", но как правильно рассчитать 2 восьмерки, учитывая толщину и ширину полосы? Конечно, я знаю основные формулы, но мне нужна оптимизированная, на частоте 730 МГц.

 

Greetings, Jomi! I have a question. An antenna like "Lear", but how to calculate 2 eights correctly, taking into account the thickness and width of the strip? Of course, I know the basic formulas, but I need an optimized one, at 730 MHz.

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