20 Hz v.mp4Single wire good NO AUDIO.mp420240124 201400 1.mp4  
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These are sweep photos of the SX-117 I.F. system.

This photo is the selectivity set to .5Kc and the scope trace is 250 cycles per graticule.

  

  

This is a photo of the selectivity set to 2.5Kc and the scope trace set to 500 cycles per graticule.

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