OWA Yagis

G0KSC SC0605M 5el 50Mhz Yagi

Gain: 10.74 dBi
F/B: 23.48 dB
Elements: 5

Specifications

Performance

Gain: 10.74 dBi
Front-to-back: 23.48 dB
Elements: 5
VSWR (max): 1.2 VSWR
Impedance: 50 Ω

Dimensions

Element dimensions

Element dimensions (parsed from legacy body — check before publishing)

Element	Position	Note
Ref	0 mm	parsed from legacy body — confirm position vs length
D1	1223 mm	parsed from legacy body — confirm position vs length
D2	2791 mm	parsed from legacy body — confirm position vs length
D3	4405 mm	parsed from legacy body — confirm position vs length
Ref	1476 mm	parsed from legacy body — confirm position vs length
Driven	1446 mm	parsed from legacy body — confirm position vs length
D1	1373 mm	parsed from legacy body — confirm position vs length
D2	1345 mm	parsed from legacy body — confirm position vs length
D3	1313 mm	parsed from legacy body — confirm position vs length
Ref	0 mm	parsed from legacy body — confirm position vs length
D1	1223 mm	parsed from legacy body — confirm position vs length
D2	2791 mm	parsed from legacy body — confirm position vs length
D3	4405 mm	parsed from legacy body — confirm position vs length
Ref	1477 mm	parsed from legacy body — confirm position vs length
Driven	1447 mm	parsed from legacy body — confirm position vs length
D1	1374 mm	parsed from legacy body — confirm position vs length
D2	1346 mm	parsed from legacy body — confirm position vs length
D3	1314 mm	parsed from legacy body — confirm position vs length

Modelled performance

Plots

About this design

G0KSC SC0605M 5el 50Mhz Yagi Antenna with a 4.4 Metre Length Boom

This antenna has been redesigned and represents what i beleive to the the 'ideal boom length' for an OWA direct feed 50Ohm Yagi. This can be seen in the model in the super flat SWR, the high levels of F/B ratio along with the excellent gain and pattern.

The model below is designed with 12.7mm / 1/2 inch and also 12mm elements. If you require a version of this antenna with another diameter wire, Email me and I will remodel. It is NOT POSSIBLE to simply resize the elements when using a VERY different diameter wire and get the best performance in my opinion, I remodel the whole antenna each time. Element positions also need to change for the ideal antenna to be achieved again. Please read all the way down this page, there are other versions of this antenna using tapered elements too. As I have more requests, I will remodel in other element diameters and tapers and pulbish those too.

The SC0605M at KF6A

'The SWR curve is where I want it to be with NO tweaking of the driven element....'

' BTW, it rained hard for 3 hours straight today and my SWR didn't flinch...'
- 'KF6A

The SC0605M at WA4NJP - Ray has now built a 9el LFA for 50MHz

'The last photo is the 5 ele 6 meter on 4.4 meter boom, a very good working little ant.'

- Ray, WA4NJP

Dimensions in Metres - all tubing 1/2 inch / 13mm diameter, mail for other sizes and tapered elements

Element spacing:

Ref = 0
Driven = .729
D1 = 1.223
D2 = 2.791
D3 = 4.405

Element sizes per element half:

Ref = 1.476
Driven = 1.446
D1 = 1.373
D2 = 1.345
D3 = 1.313

Performance figures @ 50.150Mhz:

Froward Gain: 10.74dBi free space
Front to Back: 23.48dB
1:1.2 SWR B/W 500Khz

Dimensions in Metres - all tubing 12mm diameter, mail for other sizes and tapered elements

Element spacing:

Ref = 0
Driven = .729
D1 = 1.223
D2 = 2.791
D3 = 4.405

Element sizes per element half:

Ref = 1.477
Driven = 1.447
D1 = 1.374
D2 = 1.346
D3 = 1.314

Performance figures @ 50.150Mhz:

Froward Gain: 10.74dBi free space
Front to Back: 23.48dB
1:1.2 SWR B/W 500Khz

Azimuth Plot

Elevation Plot

This fantastic antenna at 10m up

An Excellent SWR to go with the fantastic pattern!

Remeber, mail me if you have different diameter tube requirements and send photos of built antenna!