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 Two bands pairs Low Pass Filter.
Like the LPF-9 but 2 bands pairs among them: (80), (60 + 40), (30 + 20), (17 +15), (12 + 10)
Please choose 2 bands pairs you want (specify in the comments of the order form).