While the splitter is adequate for most amateur radio applications up to 30 MHz there is room for improvement. Doug Smith, KF6DX gave some thoughts and measurements for high precision splitters in an appendix to his QEX article ‘In Search of New Receiver Performance Paradigms, Part 3′ (QEX March/April 2007, pages 28-34). He used binocular cores allowing small dimensions which is beneficial for the performance at the upper part of the frequency range.

73 from Monheim. keep on experimenting, werner

it is possible to use a single core. i used a ‘binocular’ core, 43 material, and it works
very well to share the beverages between 80 and 160 m at W5WMU. for reception only, of
course..amidon BN 43-202 i think…w8diz has them, very inexpensive.

see:

http://michaelgellis.tripod.com/magict.html

the last item; with a 10 turn primary, and 7 turn secondaries, #30 wire. it works f.b. both on
my miniVNA and in the ‘real world’ of multi-tx contesting. for 50 ohm systems, of course, the resistor should be 25 ohms. our bev. feedlines in La. are RG-6, 75ohms.

73 from texas; keep up the good work. w5xz, dan