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lora:868filters [2026/03/07 21:57] – [£62 868MHz helical cavity filter] g5rktlora:868filters [2026/03/07 22:08] (current) – [£62 868MHz helical cavity filter] g5rkt
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 {{:lora:cavity-s21.jpg?600|}}\\ {{:lora:cavity-s21.jpg?600|}}\\
-After some very careful fine-tuning markers 1-4 are the frequencies which we would like to reject, pulled down to -15dB to -35dB. Not too shabby! S11 is -33dB, S21 is -2.4dB so we have a filter which we can compare directly to the SAW filter currently on site.+After some very careful fine-tuning markers 1-4the frequencies which we would like to reject, were down to -15dB to -35dB. Not too shabby! S11 is -33dB, S21 is -2.4dB so we have a filter which we can compare directly to the SAW filter currently on site.
  
 {{:lora:finished_cavity.jpeg?600|}}\\ {{:lora:finished_cavity.jpeg?600|}}\\
lora/868filters.txt · Last modified: by g5rkt