07-01-2019, 08:16 PM
I don't think the power is quite 10mW. The Aurora or Hedghog delivers about 18mV into 75R. About 4uW. So 30dB gain gives about 4mW. This also ignores the 75R to 50R mismatch.
For Ch1 a simple 3 pole Butterworth filter would do a lot of good with the harmonics. At 75R the components for 3dB down at 60MHz are approximately a pair of 33p caps and a 0.4uH inductor. The attenuation at 135MHz (3rd harmonic) would just over 20dB. Higher harmonics would be a long way down. The deisgn could be tweaked slightly to do the 75R to 50R match.
For Ch1 a simple 3 pole Butterworth filter would do a lot of good with the harmonics. At 75R the components for 3dB down at 60MHz are approximately a pair of 33p caps and a 0.4uH inductor. The attenuation at 135MHz (3rd harmonic) would just over 20dB. Higher harmonics would be a long way down. The deisgn could be tweaked slightly to do the 75R to 50R match.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
