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144 - 146 MHz High Selectivity, High Q, Low Loss Bandpass Filter BPF Outdoor Mounting

144 - 146 MHz High Selectivity, High Q, Low Loss Bandpass Filter BPF Outdoor Mounting
Product Code: 0633
Price: 95.00€
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144 - 146 MHz High Selectivity, High Q, Low Loss Bandpass Filter BPF Outdoor Mounting

Bandpass Filter BPF 144 MHz outdoor mounting uses high Q coils with unloaded Q of more than 1000, and capacitors with Q more than 1200. Low loss of filter achieved with careful design and adjustment.

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

Return Loss (S11)

Insertion Loss (S21)
 

144-146MHz-High-Selectivity-High-Q-Low-Loss-Bandpass-Filter-BPF-Outdoor-Antennas-amplifiers.com

Achieved results on a built Bandpass filter:
50 MHz = -68.3 dB
88 MHz = -45.3 dB
108 MHz = -30.8 dB
144 MHz = -0.21 dB
146 MHz = -0.21 dB
432 MHz = -50 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 50 MHz, 432 MHz station or FM transmitter (88 - 108 MHz).
 
Filter characteristics zoomed:
 
144-146MHz-High-Selectivity-High-Q-Low-Loss-Bandpass-Filter-BPF-Outdoor-S11-S21-www.Antennas-amplifiers.com
 
Bandpass filter for 144MHz characteristics zoomed again:
 
144-146MHz-High-Selectivity-High-Q-Low-Loss-Bandpass-Filter-BPF-Outdoor-zoom-www.Antennas-amplifiers.com
 
Band pass filter for 144 MHz enclosed in strong 0.8 mm sheet brass box. Strong mechanics will ensure stability and longevity. Positions of connectors are selected so that the filter can fit directly in our Plastic Box for Outdoor Mounting "DB"
 
http://www.antennas-amplifiers.com/Plastic-Boxes-Outdoor/Plastic-Box-Outdoor-DB
 
Filter for Outdoor mounting will be delivered with mast mounting clamp.
 
http://www.antennas-amplifiers.com/Antenna-parts/Clamp-for-plastic-boxes
 
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.
 
Finished Band Pass Filters:
2m-144MHz-EME-bandpass-filter-Outdoor3-www.antennas-amplifiers.com
 
 
Picture taken before before holes are drilled.
 
2m-144MHz-EME-bandpass-filter-Outdoor-S11-S21-www.antennas-amplifiers.com
 
2m-144MHz-Band-Pass-Filter-EME-Super-Low-Loss-Outdoor
What others say about Bandpass filters and preamplifiers.
 
"LNA test: Two LNA have the same behavior. Gain at 144MHz 25.96 dB, NF 0.68, LNA only Gain 25.73 dB, NF 0.88 dB, LNA + filter. Results seems cosistent and confirm the 0.2 dB loss of the filter.
-1db compression point happened with -3dBm input signal level."
 
73 Franco I2FAK"
 
 
"Many thanks, good news today all staff well arrived ! I made DUTs on test this PM to the VNA HP 8510C and to the noise analyzer, congratulations all specs are very well respected ! NF it is a bit better 0.28dB on 144MHz, for the others bands as you say.
 
73 Sylvain F6CIS"
 
Indoor varijant can be found here:
 
http://www.antennas-amplifiers.com/Band-Pass-Filter/144MHz-Bandpass-Filter-BPF
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