144 - 146 MHz Bandpass Filter and SPF-5122Z Preamplifier

In the box is embedded super low loss bandpass filter and preamplifier with SPF-5122Z. Best receiving RFI band-pass filter for Ham Radio designed for 2 meter band with preamplifier.

Achieves slightly better results than separate components. Lower NF about 0.05 to 0.1 dB. Thanks to two less connectors.

Thanks to input filtering this preamplifier and band pass filter combination are much more immune to interference from strong signals out of the band.

The recorded data on the assembled filter with HP8753ES network analyzer full 2-port calibrated are presented below.

Attenuation:

7 MHz = -78 dB

 

Measured Return Loss (S11) and Insertion Loss (S21). Characteristics of 144 - 146 MHz Band pass filter with an amplifier.

 

 

5. Measured UHF attenuation. 

 

Positions of connectors are selected so that the filter can be directly connected to the coaxial relay as shown. Band pass filter enclosed in strong 1mm sheet brass box. Strong mechanics will ensure stability and longevity.

 

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