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. For repeater duplexers, the receiver’s impedance must match the duplexer’s 50 ohm impedance. My filter is a fifth order Elliptic type with stop-band attenuation designed at 40 dB. My MFJ-259B antenna analyzer output is 8 dBm. SAVE 8 FOR EVERY 197 WITH CODE BODYCAMERASELL1 See all eligible items and terms. NanoVNA-H Vector Network Antenna Analyzer MF HF VHF UHF Analyzer W/ SD Card Slot. This model NanoVNA-H is a variant based on the. NanoVNA Vector Network Analyzer HF VNA VHF UHF UV Analyzer 10K-1.5GHz With Shell. Report this item Report this item - opens in new window or tab. The NanoVNA is an open-source handheld 50KHz to 900MHz Vector Network Analyzer with Touch Screen Display. Nanovna-H Vector Network Analyzer,Upgraded HW3.6 10KHz-1.5GHz MF HF VH New. Since I built my filter with lossy through-hole components on a DIY circuit board, I am very satisfied with the results. NanoVNA SAA-2N V2.2 Vector Network Analyzer 50KHz-3GHz HF VHF UHF Antenna. 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. Recently, I built an outboard 1.7 MHz high pass filter to reduce medium wave overload signals arriving at my wideband SDR receivers. It arrived quickly, but I never got around to using it until now. For US $45, I figured I could not go wrong so ordered one. It’s tiny and works stand-alone or connected to your PC. Last winter, I started to hear about the NanoVNA vector network analyzer.
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