On 5/14/2020 9:26 AM, Tom | SP5XO wrote:
d, wideband match. Since short vertical inv L over reasonable ground should have roughly 20 OHm impedance that could work here as well.
The matching network that will maximize bandwidth is an autotransformer wound on a 2.4 inch diameter ferrite core. For example, a transformer with a 3:2 turns ratio will transform 50 ohms to 22.2 ohms. I use a homebrew autotransformer on my 90 foot vertical which has around 25 ohms drive impedance. See Jerry Sevick's book on RF transformers for info on "un-uns". Rick N6RK _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
