6m High Selectivity, High Q, Low Loss RX Bandpass Filter Outdoor

6m High Selectivity, High Q, Low Loss RX Bandpass Filter Outdoor
Product Code: 0622
Price: 95.00€
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50 - 51 MHz High Selectivity, High Q, Low Loss Outdoor Bandpass Filter

Bandpass Filter BPF uses high Q coils with unloaded Q of more than 1000, and capacitors with Q more than 2500. Low loss of filter achieved with careful design and adjustment.

Outdoor variant is especially good to put just before LNA near antenna on tower. This is outdoor variant. Suitable for use on rain, snow, wind. Water never enters this "DB" box.


Here are presented measured results with HP8753ES network analyzer full two port calibrated.


Return Loss (S11)
Insertion Loss (S21)


Achieved results on a built Bandpass filter:

7 MHz = -90 dB
14 MHz = -72 dB
28 MHz = -45 dB
50 MHz = -0.11 dB
51 MHz = -0.12 dB
70.2 MHz = -33 dB
88 MHz = -49 dB
108 MHz = -61 dB
144 MHz = -89 dB
432 MHz = -64 dB
These excellent results were achieved by careful selection of components and design of the filter. This type of filter is necessary when you have near by strong HF (1.8 - 30MHz), 70MHz, 144 MHz station or FM transmitter.
Filter characteristics zoomed:
Positions of connectors are selected so that the filter can be used in our "DB" plastic box for outdoor mounting.
This type of filter will almost nothing disturb noise performance of preamplifiers which is especially important in terrestrial and EME (Earth - Moon - Earth) communications. It will further ensure smooth operation in the presence of strong signals.
Filter weight: 1.25kg
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