Low Noise Radio Preamplifier 87.5 – 108 MHz with integrated Band Pass Filter

Super Low Noise preamplifier with integrated Input Band Pass filter for chasing super weak signals in FM range 87.5 – 108 MHz.

Input filtering will prevent overloading from out of band signals.

Outdoor mounting of super low noise preamplifier for FM range 87.5 – 108 MHz.

This FM preamplifier combination consists of two devices:

1. Low loss band pass filter 88 – 108 MHz  on preamplifier input side. Insertion loss just 0.35 dB

2. Wide band Low Noise Amplifier with PGA-103+

Input connectors “F” 75 Ohms

Achieves better results than two separate components. Lower NF about 0.05 to 0.1 dB. Thanks to two less connectors. Measured results with HP 8753 ES network analyzer full two port calibrated:

 

Frequency:	Gain:
HF band	> – 26 dB
50 MHz	– 8 dB
88 – 108 MHz	+ 25 dB, NF=0.85 dB
145 MHz	– 27 dB
432 MHz	– 28 dB

 

These excellent results were achieved by careful selection of components and design.

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

Measured Return Loss (S11) and Gain (S21) of VLNA FM DX Radio FM 87.5-108 MHz low noise amplifier

 

 

FM super low noise preamplifier for 87.5 – 108 MHz is enclosed in strong 0.8 mm sheet brass box.

Strong mechanics will ensure stability and longevity.