Friday, February 5, 2016

Hybrid Low Pass filter - 80m nulls 40m,  part 3

  After 20m, 40m and 160m Hybrid Low Pass filters there is another one. Now for 80m and nulls 40m band. I used RG-213 coax cable . There is 11 turns with 2.5mm Cu wire on 30mm. There are some results:

Insert loss abt 0,07 dB
S11 beter than -28 dB
SWR better than 1:1,1
40m Null best -80dB, in band better than -60 dB

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