Quote:
Originally Posted by Visionoz
Hi Malcolm
I thought you were building a DDRR antenna - that mesh you're using is fine for a ground plane though the surface area might not be optimal for 20MHz - this one looks pretty well made! 
Perhaps an antenna amp would be the go?
Cheers
Bill |
Hi Bill just check my design handbook and the mesh is fine, it recommend metallic flywire type screening though as it only a reflector. There is a couple of design changes after reading the handbook.
Reduce the extension of the radiating element to about 200mm currently at 750mm - This should also help improve balance.
Second one is to extend the outer parameter but not by much. It only requires minimum 10% which it is quite close. The design though may not fit in my garage.
The design does suggest an antenna amplifier so I will give this a go as the next project. I prefer balanced injection. Unbalance is always dicey with hum.