21-09-2016, 07:02 AM
(20-09-2016, 09:04 PM)Cardigan Wrote: I wonder if it would be possible to adapt the 300 -> 75 Ohm baluns you can buy for VHF/FM tuners?
Not worth the effort, many are poor quality and may give poor isolation. A "braid breaker" sold to reduce CB radio interference likely is better but I'd not trust it either. The ferrite beads suitable for 40MHz up are cheap. I'd use PTFE insulated wire rather than enamel to get the isolation, or 1kV XY rated ceramic capacitors (which is what is often inside set-top aerials and late model live chassis, or both. PVC tube or old broad felt tip marker case.
