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2 Meter Band-Pass Filter with Very Low Noise Preamplifier.
Device contains High Selectivity, High Q, Low Loss Bandpass Filter with PGA-103+ Preamplifier.
This 144 – 146 MHz Band-pass filter will be perfect to suppress out of band signals
144 – 146 MHz band-pass filter and amplifier.
This combination consists of two devices:
Achieves better results than two separate components. Lower NF about 0.05 to 0.1 dB. Thanks to two less connectors.
Measured results with HP8753ES network analyzer full two port calibrated:
|1.82 MHz||– 75 dB|
|3.8 MHz||– 82 dB|
|7.1 MHz||– 80 dB|
|14.15 MHz||– 67 dB|
|21.2 MHz||– 62 dB|
|28.4 MHz||– 55 dB|
|50.1 MHz||– 40 dB|
|54 MHz||– 37 dB|
|70 MHz||– 29 dB|
|70.5 MHz||– 28.5 dB|
|FM: 88 MHz||– 18.5 dB|
|FM: 98 MHz||– 12.3 dB|
|FM: 108 MHz||– 5.3 dB|
|144 MHz||+ 25 dB NF = 0.7 dB (Calculated bandpass filter insertion loss)|
|144.1 MHz||+ 25 dB NF = 0.7 dB (Calculated band pass filter insertion loss)|
|146 MHz||+ 25.1 dB NF = 0.7 dB (Calculated band pass filter insertion loss)|
|288.2 MHz||– 34 dB|
|296 MHz||– 36.5 dB|
|432.1 MHz||– 46 dB|
|440 MHz||– 44 dB|
|IP3out||> 37 dBm|
|Power consumption:||+10-15 V / 100 mA|
These excellent results were achieved by careful selection of components and design.
Thanks to input filtering this preamplifier and band pass filter combination are much more immune to interference from strong out-of-band signals. Compared to output filtering.
Measured Return Loss (S11) and Insertion Loss (S21) of 144 – 146 MHz Band-Pass Filter and Amplifier:
1. HF attenuation measurement:
2. Attenuation measurement from 50 MHz to 70.5 MHz.
3. FM attenuation (88-108 MHz) for 144 MHz Band Pass Filter With Pre-Amplifier.
4. Measured Harmonic and UHF attenuation.
Band pass filter enclosed in strong 0.8 mm sheet brass box. Strong mechanics will ensure stability and longevity.
Version with relays is here.
Link to 144 MHz band-pass filter and pre-amplifier, but made for outdoor use. It is inside plastic box (meets IP63 standard): Amplifier & Band-Pass Filter inside Plastic Box for Outdoor Use
Link to all band-passers: Band-Pass Filers
Link to 2 meter Antennas: 2 Meter High Gain Low Noise Antennas for 144 MHz