Good common mode choke for 100 khz to 3 MHz?
I need a good common mode choke for this band. I made the Dipole's 1:1 balun from an FT240-43 or 61 toroid (I didn't remember, I bought it 10+ years ago) but I need an additional one, because the coax line acting like an antenna especially on the MW band.
Dipole works like a charm above 3 mhz with (almost) no noise. (2x27m on 5m high poles)
An ft140-77 with 19 turns of RG-174 can be a good choice? I can buy these materials locally, ordering from abroad is too expensive because our currency (HUF) is weaker and weaker. I need this to for my Dipole on the Kiwi and for the MiniWhip at my home (My kiwi is at the country house). (I'll explain the MiniWhip problem in an another question...)
The feed line is a professional Tri-Shield 75 ohm coax and 40+m long in both cases.