G0KSC SC0605SM 5el 50Mhz Yagi Antenna with a 3.411 Metre Length Boom
Please read the whole page, there are several versions of this antenna listed. If you do not the the diameter tubing you need to have this in or require tapered elements, Email me!
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.
M1BTI built the SC0605S for QRP work
Dimensions in Metres - all tubing 1/2 inch / 13mm diameter, mail for other sizes and tapered elements
Element spacing:
- Ref = 0
- Driven = .503
- D1 = .753
- D2 = 2.069
- D3 = 3.411
Element sizes per element half:
- Ref = 1.494
- Driven = 1.473
- D1 = 1.392
- D2 = 1.367
- D3 = 1.327
Performance figures @ 50.150Mhz:
- Froward Gain: 10.04dBi free space
- Front to Back: 21.64dB
- 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 = .503
- D1 = .753
- D2 = 2.069
- D3 = 3.411
Element sizes per element half:
- Ref = 1.495
- Driven = 1.474
- D1 = 1.393
- D2 = 1.368
- D3 = 1.328
Performance figures @ 50.150Mhz:
- Froward Gain: 10.03dBi free space
- Front to Back: 21.48dB
- 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!