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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
Ferrite Shop Ferrite-shop on-line shop, cable clamps,toroids, cable cores, technic,ferrite material choice
Amateur radio kits by Kanga US
50MHz to 28MHz RX Converter The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal