Tag: Antenna

1/4 Wave Antenna Calculator

I have been making a few 1/4 wave antennas lately, mainly for UHF and the GHz bands with good success, so I decided to create a calculator to simplify the process and maybe get some people who have not tried one before to give it a go.

For UHF for example, these can be made very cheaply, very easily and they perform well. Try one on 433MHz plugged into your handheld for example 🙂

Go to the 1/4 wave ground plane calculator

The 1/4 wave ground plane

The calculator is at m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/

Building a 4 element 15m monoband Yagi with M0TAZ

Hmm, what to do on a bank holiday Monday? Well, we decided to purchase the aluminium to build a 15m and 10m Yagi about 6 months ago, so it was time to make something of it. Dave M0TAZ is building a 4 element 15m Yagi, and I am building a 3 element 10m Yagi. Dave started constructing his 15m beam this week. It is a DK7ZB 28Ω feed-point 4 element Yagi, with a forward gain of ~6.4dBd. The elements are tapered with 3 different sizes of tubing and the boom is 40mm square and 5m long. All that’s needed now is the feed-point arrangement and it’s ready for testing! Still, it looks great and is very rigid. Cant wait to get it on the mast! Here are a few photos for now…

The 15m Monoband Yagi

The 15m Monoband Yagi

The 15m Yagi - Disassembled.

The 15m Yagi – Disassembled. About £100 worth of aluminium!