If I had used high-Q inductors, you would see a couple of deep notches at 7 kHz, but even with lesser components, you can see a 35 dB notch at near this location. My filter is a fifth order Elliptic type with stop-band attenuation designed at 40 dB. Since I built my filter with lossy through-hole components on a DIY circuit board, I am very satisfied with the results. My sweep from 500 kHz to 10 MHz showed attenuation of more than 30 dB in the AM broadcast band, followed by a flat uniform response above the cutoff frequency. Plugging in my filter as the device under test (DUT), I ran a sweep to produce the graph of insertion loss (S21 gain) as shown in the diagram above. Although I had measured its performance using my signal generator and oscilloscope, I thought taking some measurements with the NanoVNA would be a good learning experience. SV4401A 7" 50KHZ4.4GHZ Vector Network Analyzer NanoVNA Antenna Analyzer FCC CE - 644.77. Recently, I built an outboard 1.7 MHz high pass filter to reduce medium wave overload signals arriving at my wideband SDR receivers. Seller assumes all responsibility for this listing. It arrived quickly, but I never got around to using it until now. NanoVNA V2 Vector Analyzer Antenna Analyzer Shortwave 50KHz-900MHz. For US $45, I figured I could not go wrong so ordered one. NanoVNA-F V2 LCD Display Vector Network Analyzer 4.3 Inch IPS Spectrum Analyzer S-A-A-2 Antenna Analyzer Short Wave HF VHF UHF. Think of a spectrum analyzer as a sensitive oscilloscope that displays in the frequency domain. It’s tiny and works stand-alone or connected to your PC. What you want for that is a spectrum analyzer. Last winter, I started to hear about the NanoVNA vector network analyzer.
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