Universal Bandpass Filters for HF Transceivers "BPF-6" (6 bands) with RF amplifier & ATT
PASSIVE BAND PASS FILTERS FOR HOME-MADE RECEIVERS OR TRANSCEIVERS
Can be used as the additional band pass filter between antenna and a cheap receiver.
People say it pass perfect as PreSelector to PCR100, PCR1000 , SDR, Pilgrim, receivers...
PCB Dimension is 123x55 mm
This unit tuned for 160,80,40,2015,10 meters 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 .