Receive Filters(IN-PROGRESS)

Receiving those strange and wonderful DX transmitters can be difficult if other nearby transmitters are overwhelming your receiver's ability to hear weak signals.  Filtering out what we do not want lets us increase the amount of usable signal to noise available for our receivers.

Testing

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took

Testing

place

with
• a NanoVNA Ultra+LiteVNA64,
  • Calibratedcalibrated to normalize test cables
  cables,
  and
• Measuringmeasuring signal loss between the two ports
  
test

ports.

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RTL-SDR.COM filters

• 88-108MHz BANDSTOP Broadcast FM Reject Filter
  • <0.25db Insertion Loss
• 2.4MHz HPF Broadcast AM Reject Filter
  • <0.25db Insertion Loss (Above 7MHz)

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Nooelec filters

• Flamingo+ High Attenuation Broadcast FM Bandstop Filter
  • <0.5db Insertion Loss
• Distill:AM Broadcast AM Bandstop Filter
  • <0.25db Insertion Loss (Above 3MHz)
• Ham Filter Bank Multiband Bandpass Filter
  • <2db to <5db Insertion Loss (Has internal amplifier)

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Halibut Electronics

• AM/FM/Cell Broadcast Interference (BCI) Filter
  • <1.5db Insertion Loss

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Microstrip style filters

• ADS-B 1090 microstrip filter
  • <2db Insertion Loss

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Cheap filters

• Quad Band Pass Filter
  • <3db Insertion Loss