Home brew 40-80 Balanced Fan Dipole



Hi All! Hope you are keeping safe... We are in the same position as most regarding lock down and other than going to work I have been stuck indoors a lot lately. So, off outside into the garden it was and antenna building time once again was here. 

I decided to replace the prototype 40/80 fan dipole that has been in use since the end of spring. It has been working really well even though I made it from some random used wire, I bought three reels of SotaBeam military spec heavy duty wire which come in 50 meter reels. The wire is stainless coated multi strand 50 ohm and is in a low impact green colour. It is very good for antenna elements or radials and solders up nicely. 

I also decided I wanted to try out this new build double dipole with a suitable 1:1 balun that would help prevent unwanted coaxial line transmission and also help reduce unwanted reception noise on the feed line from random electrical sources nearby. The balun also helps to isolate the returning RF at the feed point and balances the dipole elements to 50ohm, as well as helping to produce a more effective radiation pattern on the transmit signal generated.

I looked into making my own, but in my possession had a gift voucher to spend on Amazon. So I opted for a commercially built balun capable of handling my 400 watts. I ended up with the Diamond BU-50A which is a really neat piece of kit.



I made a step by step video on how to make your own 40/80 fan/balanced double Dipole, If you want to have a go watch the video below. 

Step by step how to make a 80/40m Fan Dipole with 1:1 Diamond BU-50A Balun


The result is great! I have 1:1 - 1:5 across the full 80m band without any need for an ATU and the same  1:1 - 1:5 also on 40m after a slight adjustment. I had made the antenna slightly longer and had to cut the legs equally to achieve the best match. The reception clarity has improved on both bands and the noise has lowered in strength. My out going signal as ever, is good to go and I will be DX hunting over the winter months! Thanks for passing by catch you soon. 73 Stay safe!

Comments

Popular posts from this blog

Do You know What The Word HAM Means?

Full Size Delta Loop for 20M

YAESU FT-857 Front Panel Repair