Universal Bandpass Filters for HF Transceivers "BPF-9" (9bands), RFamp & ATT
Can be used as the additional band pass filter between antenna and a cheap receiver.
Passive Band pass filters for home-made Receivers or Transceivers
People say it pass perfect as PreSelector to PCR100, PCR1000 , SDR, Pilgrim, receivers...
PCB Dimension is 163x55 mm
This unit tuned for 160,80,40,30,20,17,15,12,10 m amateurs bands.
Losses are 1-3 dB. It has RF amplifier with frequency compensated gain(10-20dB), using one medium power RF transistor , and attenuator -20dB.
The operating voltage for installed relays is 13.8V
Passband ripple is abt. 0.5dB inside the band.