UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Attenuators

G8HQP Dave · 29th Nov 2017, 6:23 pm

Both methods, applied correctly, will give the same results for those situations where the load and source have the same phase angle. If the angle is different then you have to slog through the algebra.

What you can't do is ignore the phase angle - even if you only want to get the magnitude right. 50+j50 has a magnitude of 70 but you cannot substitute 70 for 50+j50 and get the same result from a circuit.

29th Nov 2017, 6:23 pm	#15
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: Attenuators - theory and the design of. Both methods, applied correctly, will give the same results for those situations where the load and source have the same phase angle. If the angle is different then you have to slog through the algebra. What you can't do is ignore the phase angle - even if you only want to get the magnitude right. 50+j50 has a magnitude of 70 but you cannot substitute 70 for 50+j50 and get the same result from a circuit.