G0KSC SC0604S 4el 50Mhz Yagi Antenna with a 2.402 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.
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 = .967
- D1 = 1.270
- D2 = 2.402
Element sizes per element half:
- Ref = 1.495
- Driven = 1.479
- D1 = 1.385
- D2 = 1.307
Performance figures @ 50.150Mhz:
- Froward Gain: 8.54dBi free space
- Front to Back: 18.83dB
- 1:1.1 SWR B/W 600Khz
Dimensions in Metres - all tubing 12mm diameter, mail for other sizes and tapered elements
Element spacing:
- Ref = 0
- Driven = .967
- D1 = 1.270
- D2 = 2.402
Element sizes per element half:
- Ref = 1.496
- Driven = 1.480
- D1 = 1.386
- D2 = 1.308
Performance figures @ 50.150Mhz:
- Froward Gain: 8.53dBi free space
- Front to Back: 18.93dB
- 1:1.1 SWR B/W 600Khz
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!