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Build a lowcost yagi antenna for PMR446
PMR446 stands for Personal Mobile Radio and is a license free radio in the 446 MHz UHF band. That is about 6 Mhz above the 70cm amateur radio band
post 13 Nov 2024
Antenna for UHF VHF Links →
8x2 Element Array Antenna For 144 MHz
Front/back ratio was measured with a Drake R4c receiver with VHF converter listening to some strong and weak signals. I found substantially more than 25 dB
144MHz 2m Portable Yagi VHF Beam Antenna
6 elements was chosen, as the boom length is 2m (6.5ft) which keeps it portable, whilst still having good gain
144 MHz 25 Ohm Stacked Yagi
The array works excellent with a very good antenna pattern.The measured SWR of the complete group in the common feeding point is 1,1 beween 144,0 and 144,8 MHz
9 element yagi for 144Mhz
>Band 144-146 MHz, gain 11 dB
A Batwing Antenna
A batwing element with dimensions for a center frequency of 434.5 MHz which should cover 370 to 500 MHz with a VSWR of 1:1.1 or less. All dimensions shown are in inches. Multiply by 2.54 to obtain dimensions centimeters
155
Front/back ratio was measured with a Drake R4c receiver with VHF converter listening to some strong and weak signals. I found substantially more than 25 dB
6 elements was chosen, as the boom length is 2m (6.5ft) which keeps it portable, whilst still having good gain
The array works excellent with a very good antenna pattern.The measured SWR of the complete group in the common feeding point is 1,1 beween 144,0 and 144,8 MHz
>Band 144-146 MHz, gain 11 dB
A batwing element with dimensions for a center frequency of 434.5 MHz which should cover 370 to 500 MHz with a VSWR of 1:1.1 or less. All dimensions shown are in inches. Multiply by 2.54 to obtain dimensions centimeters
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free