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Showing posts from March, 2021

The Trident multi Band aerial for scanners and sdr reception and transmitting

I wanted a Discone type aerial, they look great! Then I read some reviews and people said that a dual band dipole worked better. I also wanted to be able to use it for different bands. So on YouTube I found the best dual band aerial design I could. Then I found this 2M ground plane aerial/antenna . why not combine elements of both? So why would this work? Well, when an antenna or aerial is resonant it's impedance falls to around 50 Ohms. When it is outside resonance the impedance rises to several thousand Ohms and becomes irrelavent as it reduces the signal. So when you are on 2M the other tripod elements are ignored and you can achive good power transfer and gain. The same is true for each other band. I have seen this on other aerial designs too. It does work I promise you! Antenna vs aerial, what is the difference?  An aerial is to receive radio signals only, there are other design considerations but an Antenna has to cope with high voltages and heat. An antenna is designed to