K&L tunable bandrejectfilter

+ + + - D L 4 X A V - jo 43 xn - h a m b u r g , g e r m a n y , e u r o p e , e a r t h + + +

K&L tunable bandrejectfilter model TNF 1425 covers 125 - 250 MHz
by microwave incoporated

passband is usable up to 583 MHz with -1.8 dB or less

center 900 MHz - span 1800 MHz notch -55 dB at 210.6 MHz	center 300 MHz - span 600 MHz notch -42 dB at 142.2 MHz	center 300 MHz - span 600 MHz notch -55 dB at 210.6 MHz

center 142 MHz - span 10 MHz - ref -10 dB
notch -38 dB when tuned to 142 MHz - 144 MHz - 1.1 dB

reverse engineering

schematic - left coax ~21cm - right coax ~23cm

dl4xav 2012

K&L tunable bandrejectfilter model TNF 1425 covers 125 - 250 MHzby microwave incoporated