I’m interesting in building some trapped wire dipoles using coax traps.
I don’t have an antenna analyser like an MFJ 259 or a dip meter, but can I not do something with a VNA (Vector Network Analyser) and or a Spectrum Analyser?
(I have access to those )
I’ve used the VNA in the past to fine tune an open ¼wave stub coaxial notch filter, nice and simple task as all coaxial, but wondering if I could do the same (use VNA to tune) with a trap?
Also, I’m finding lots of designs for trap dipoles for 10, 15, 20, 30, 40, 80, but I’m thinking less (at least dropping 80) something like 15, 20, and 40. Presumably I can just use 2 traps for three bands, how do I re-calculate the antenna sections between them?