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50 - 51 MHz High Selectivity, High Q, Low Loss RX Bandpass Filter BPF

50 - 51 MHz High Selectivity, High Q, Low Loss RX Bandpass Filter BPF
Product Code: 0621
Price: 89.00€
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50 - 51 MHz High Selectivity, High Q, Low Loss Bandpass Filter BPF

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.

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

6m-High-Selectivity-High-Q-Low-Loss-Bandpass-Filter-Measuring-50MHz

Return Loss (S11)
Insertion Loss (S21)

6m-50MHz-Bandpass-filter-S11-S21-Finished-filter

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:
 
6m-Bandpass-filter-S11-S21-Zoomed-on-network-analyzer
 
 
 
 
Positions of connectors are selected so that the filter can be used in our "DB" plastic box for outdoor mounting.
 
6m-Low-Loss-Bandpass-Filter-with-144MHz-BPF
 
 
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.
 
50MHz-High-Selectivity-High-Q-Low-Loss-Bandpass-Filter-144MHz-BPF
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