OWA Yagis

G0KSC SC0605SM 5el 50Mhz Yagi

Gain: 10.15 dBi
F/B: 23.6 dB
Elements: 5

Specifications

Performance

Gain: 10.15 dBi
Front-to-back: 23.6 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
D2	2128 mm	parsed from legacy body — confirm position vs length
D3	3563 mm	parsed from legacy body — confirm position vs length
Ref	1488 mm	parsed from legacy body — confirm position vs length
Driven	1469 mm	parsed from legacy body — confirm position vs length
D1	1390 mm	parsed from legacy body — confirm position vs length
D2	1361 mm	parsed from legacy body — confirm position vs length
D3	1318 mm	parsed from legacy body — confirm position vs length
Ref	0 mm	parsed from legacy body — confirm position vs length
D2	2128 mm	parsed from legacy body — confirm position vs length
D3	3563 mm	parsed from legacy body — confirm position vs length
Ref	1489 mm	parsed from legacy body — confirm position vs length
Driven	1470 mm	parsed from legacy body — confirm position vs length
D1	1391 mm	parsed from legacy body — confirm position vs length
D2	1362 mm	parsed from legacy body — confirm position vs length
D3	1319 mm	parsed from legacy body — confirm position vs length

Modelled performance

Plots

About this design

G0KSC SC0605SM 5el 50Mhz Yagi Antenna with a 3.563 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.

Built by WA4ZTY

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

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

Element spacing:

Ref = 0
Driven = .524
D1 = .787
D2 = 2.128
D3 = 3.563

Element sizes per element half:

Ref = 1.488
Driven = 1.469
D1 = 1.390
D2 = 1.361
D3 = 1.318

Performance figures @ 50.150Mhz:

Froward Gain: 10.15dBi free space
Front to Back: 23.60dB
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 = .524
D1 = .787
D2 = 2.128
D3 = 3.563

Element sizes per element half:

Ref = 1.489
Driven = 1.470
D1 = 1.391
D2 = 1.362
D3 = 1.319

Performance figures @ 50.150Mhz:

Froward Gain: 10.14dBi free space
Front to Back: 23.39dB
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!