NanoVNA for Hydrogen Line BPF+LNA Testing

Introduction

In several previous posts I tested a 137MHz & 433MHz [BPF+LNA] for their frequency response or S21 using the NanoVNA (Ref.1/3). In this post I will use the same procedure to test the Hydrogen Line H1 [BPF+LNA] unit.

Measurement Setup

Fig.1 Block Diagram of Equipment Setup
Fig.2 Equipment Testing Setup

Figure 1 shows the Block Diagram of the Equipment Setup. The [BPF+LNA] is fed from Port1 through a 40dB pad. Previously I only used a 20dB pad, but this LNA has a 40dB gain. The [BPF+LNA] output feeds a 10dB pad into Port2. The [BPF+LNA] is powered by a 5VDC Lithium battery. Calibration consists of Open/Short/50ohm/Isolation/Through and setting the sweep from 1300/1500MHz. Note that this is at the limit of the NanoVNA range.

Measurement Results

Fig.3 S11 & S21 for 50dB pad Port1-Port2
Fig.4 S11 & S21 for [BPF+LNA] Test Setup

Figure 3 shows S11 & S21 for just the input + output pads of 40dB + 10dB = 50dB. Note the irregular line at approx -50dB. Figure 4 shows the result with the [BPF+LNA} added showing an approx 40dB gain above the -50dB base line.

Fig.5 YouTube Video NanoVNA for Hydrogen Line BPF + LNA Testing

References

#1. – “NanoVNA for 137MHz Satellite Weather BPF + LNA Testing”
https://jeremyclark.ca/wp/telecom/nanovna-for-137mhz-satellite-weather-bpflna-testing/

#2. – “NanoVNA for 433MHz/70cm BPF + LNA Testing”
https://jeremyclark.ca/wp/telecom/nanovna-for-433mhz-70cm-bpflna-testing/

#3. – “NanoVNA for 433MHz/70cm LNA Testing”
https://jeremyclark.ca/wp/telecom/nanovna-for-433mhz-70cm-lna-testing3

#4. – “NanoVNA Related Blog Posts”
https://jeremyclark.ca/wp/blog-topics/


By Jeremy Clark

Jeremy Clark is a Senior Telecommunications Engineer and Advanced Amateur Radio Operator VE3PKC. He is the author of E-Books on Telecommunications, Navigation & Electronics.