Airband Filter

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A new Airband bandpass filter centered at 128 MHz. The filter has a bandwidth of 20 MHz.  The filter is designed to reject strong signals in the adjacent FM band. Here are the specifications:

Frequency (MHz) Typical Attenuation (dB)
78 43
88 35
98 25
108 10
118 4
120 4
125 4
128 4
138 4
150 11
200 39

 

The filter is available on Tindie 

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GPS Bandpass Filters

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Herbert Ullmann AF4JF,  tests and describes some applications of the 433 MHz, GPS and 1268 MHz bandpass filters in this post: http://af4jf.blogspot.ca/2016/06/filters-filters-and-more-filters.html

GPS Filter

433 MHz Filter

If you’re looking for some gain in addition to filtering for the GPS 1575 MHz  band, here’s a Pre-filtered GPS LNA.