antenna problem

I am using a NanoVNA and testing a SMA (Connected to an external GPS) to IPX / U.FL (connected to PCB, PCB has male) wire. I have done proper calibration of NanoVNA (short, open, load, through) and measuring S11 and S21 parameters on NanoVNA. I got little surprised that at higher frequency my...

Hello, Sorry 1) if this is wrong place 2) Dumb question. I am working on smart irrigation project, I have Arduino connected with 4 sensors and 1 actuator, Arduino collect data and send to ESP32 using Reyax RYLR896 Lora Module connected to it. I keep all PCBs in one waterproof box, but this...

So I purchased this : (HanRongDa HDR-831) HanRongDa HDR-831 It's working great but the practical range is about 15 meters. I'm looking to upgrade this. The thing is, I know very little about radio frequencies and antennas. Can something like this work ? Ebay Amplifier The device I purchased...

I am attempting to calculate an antenna's input impedance. I have been given this information: A 50 Ω coaxial line is feeding an antenna with a signal frequency of 150 MHz. The coaxial line has a dielectric constant of 2.25, with an outer conductor of 40 mm. The antenna and coaxial cable are...

A local golf course asked me to install a RE3 Wireless microphone system on their patio. I ran coax about 50 feet between the antennas. On the patio side where the antenna is connected to the "A" antenna input, the signal is received well, but on the "B" port it is only picked up about 5% of the...