LPF-9B Nine bands Low Pass Filter (80-60-40-30-20-17-15-12-10 meters).
The LPF-9B kit is a module contains 5 low-pass filters switchable by relays (two bands each filter). This is the necessary complement to the 3 to 30MHz broadband amplifier kit "QPA-1" or to any other HF broadband amplifier up to 50W that does not incorporate low pass filters.
LPF-4B Four bands Low Pass Filter.
Like the LPF-9 but 4 bands.
Please choose 4 bands you want (specify in the comments of the order form).