Icom IC2KL, 4KL Standard RFI Kit
Included are the following chokes and installation guidelines:
RF Input: F240 toroid – 5-9 turns of RG-58 size through center
RF Output: FSB-1 (Big Clamp on) – 3 turns of RG-8 size cable
Relay Cable: FSB-1/2 – multiple turns through choke – ½” diameter hole
Transceiver Control Cable: FSB-1/2 – multiple turns through choke – ½” diameter hole
AC Power Line: FSB-1 (Big Clamp on) – 3 turns through center
Note to PW1 owners - use the DELUXE kit that has filters for all the I/O lines, 4 antenna outputs, and multiple input lines. See part # RFI-LA-PW1
50 ohm coax to 75 ohm balanced output baluns are useful for low (< 1 wavelength) dipoles exhibiting 75 ohm characteristic impedance or for matching to balanced ladder line whose endpoint impedance is near 75 ohms.
50 ohm coax to 75 ohm CATV coax connections are easily done with a 1.5:1 unun with SO-239 connectors on input and output. Likewise 50 ohm coax to unbalanced verticals or loads near 75 ohms can be matched with a 1.5:1 unun.