![\"\"](\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_SAW.jpg\")
<\/a>SAW filtered LNA<\/p><\/div>
\nFor test i assembled one board for 70cm, 23cm and 13cm each.<\/p>\n
<\/a>LNA 70cm<\/p><\/div>
\nAs written above the 70cm SAW starts to attenuate a lot around 437MHz. There was a type with broader response but it is available nowhere.
\nThe overall gain is about 18..19dB which is in line with MMIC and filter datasheet.<\/p>\n
<\/a>LNA 70cm wideband<\/p><\/div>
\nLooking to the wideband response of the filter reveals that it looses its filter capabilities over 1200MHz.<\/p>\n
<\/a>LNA 23cm<\/p><\/div>
\nThe filter used for 23cm is a bit wide. It exceeds the amateur allocation a lot at the lower end. At the upper end 1296MHz is already at the edge. The maximum gain is around 1180MHz with 13dB. For 1296MHz it results in roughtly 8dB gain only.<\/p>\n
<\/a>LNA 23cm wideband<\/p><\/div>
\nThe filter capability is maintained over a broader range and de-rates at over 5GHz.<\/p>\n
<\/a>LNA 13cm<\/p><\/div>
\nThe filter for 13cm fits pretty well. Although the MMIC has even less gain the filter also has less attenuation than the 23cm type on 1296MHz. Therefore it also results in about 8db gain.<\/p>\n
<\/a>LNA 13cm wideband<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"
A while ago i tried the Eagle import capabilities of Kicad. I used a design of the baloon experimenteer “TT7” from Czech Republic and did some modifications to the layout. Since the LNA looked promising i sent the design for … Continue reading