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Product: Universal Lowpass Filters for HF Amateur Transceiver (LPF). 9 Bands. Soldering Project KiT. Universal Lowpass filters for HF Amateur Transceiver (LPF) This Lowpass filters for harmonic filtering at the output of the amplifier can be used with amateur transceivers There are six two-element low pass filters (LPF) in this design. The switching of bands regulates by Relays. Relay P1 (12V) at output of lowpass filters connects to the Power Amplifier or Bandpass filters of transceiver. It identify the RX/TX modes. The bands 7MHz and 10 MHz, 18 MHz and 21, 24 and 28 MHz unified and have a common low pass filters, switching relays of these bands is carried through the decoder diodes. PCB dimensions 90х62 mm. This Lowpass filters for harmonic filtering at the output of the amplifier can be used with amateur transceivers
There are six two-element low pass filters (LPF) in this design. The switching of bands regulates by Relays.
Relay P1 (12V) at output of lowpass filters connects to the Power Amplifier or Bandpass filters of transceiver. It identify the RX/TX modes.
The bands 7MHz and 10 MHz, 18 MHz and 21, 24 and 28 MHz unified and have a common low pass filters, switching relays of these bands is carried through the decoder diodes.
PCB dimensions 90х62 mm. Relays 12V RV3YF

Product: Bandpass Filters BPF-4. Soldering Project KIT "BPF-4" is a bandpass filter for 4 bands (1.8, 3.5, 7 and 14 MHz). This unit can be used in most transceivers and receivers. If need other bands - it is easy to re-build - just need to change the winding and replace the capacitor. BPF is very small and easy for assembly. Dimensions of board are 55x58mm. For adjustment recommends to use NWT or RF voltmeter; or S-meter on air if have no such devices. The Kit consists of all necessary components, elements, wire and manual in English. Support: 160m, 80m, 40m and 20 meters bands
If need other bands - it is easy to re-build - just need to change the winding and values of capacitors.
BPF is very small and easy for assembly.
Dimensions of board are 55x58mm. RV3YF