2m_28ohm

	2M - 28 Ohm Yagi Antennas

	On this page are designs for 28 ohm 2M yagi beams. The 28 ohm driver impedance gives better patterns and bandwidth. They have a matching network to 50 ohms, that is composed of 2 - 1/4 wavelenght 75 ohm coax in parallel. These are all high performance beams designed for SSB, to put on FM make the elements ~5mm shorter.

	3 Element - 2M - 28 ohm - .92m boom

Element Diameter	Reflector	Driven Element	Director
Position	0mm	480mm	860mm
10mm	1016mm	957mm	899mm
8mm	1020mm	962mm	908mm
6mm	1024mm	968mm	916mm

	4 Element - 2M - 28 ohm - .76m boom

Element Diameter	Reflector	Driven Element	Director 1	Director 2
Position	0mm	180mm	335mm	755mm
10mm	1030mm	990mm	937mm	857mm
8mm	1030mm	994mm	944mm	866mm
6mm	1031mm	998mm	951mm	876mm
4mm	1033mm	1004mm	960mm	888mm

	4 Element - 2M - 28 ohm - 1m boom

Element Diameter	Reflector	Driven Element	Director 1	Director 2
Position	0mm	230mm	495mm	980mm
10mm	1032mm	984mm	933mm	884mm
8mm	1036mm	988mm	940mm	893mm
6mm	1040mm	992mm	947mm	901mm

	5 Element - 2M - 28 ohm - 1.5m boom

Element Diameter	Reflector	Driven Element 10mm	Director 1	Director 2	Director 3
Position	0mm	315mm	545mm	1020mm	1480mm
10mm	1020mm	978mm	935mm	923mm	893mm
8mm	1022mm	980mm	942mm	930mm	900mm
6mm	1024mm	980mm	948mm	937mm	907mm
4mm	1026mm	980mm	956mm	945mm	917mm

	6 Element - 2M - 28 ohm - 2.6m boom

Element Diameter	Reflector	Driven Element 10mm	Director 1	Director 2	Director 3	Director 4
Position	0mm	320mm	675mm	1300mm	2020mm	2580mm
10mm	1019mm	968mm	919mm	898mm	898mm	888mm
8mm	1020mm	968mm	927mm	906mm	906mm	896mm
6mm	1022mm	968mm	936mm	916mm	916mm	906mm
4mm	1024mm	968mm	950mm	926mm	926mm	916mm

	5 Element - 2M - 50 ohm - 1.5m boom

	For FM Operation (144 - 145) make each element 8mm shorter (reflector 4mm shorter

Element Diameter	Reflector	Driven Element	Director 1	Director 2	Director 3
Position	0mm	280mm	415mm	950mm	1480mm
8mm	1030mm	976mm	926mm	919mm	907mm
6mm	1032mm	984mm	935mm	926mm	916mm
4mm	1034mm	992mm	946mm	937mm	924mm

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