You should test your cables regularly. Some may go bad, especially cheap or older ones, with poor connectors or breaks. Read more
Category: Electronics Projects
Antenna Switch Adventures – Looking Forward
My antenna switch adventures have provided a valuable learning opportunity. Especially to reduce noise in RF circuits under Arduino control. Read more
Sainsmart Relay Antenna Switch Disappointment
Well, it’s time for me to declare my DIY antenna switch disappointment. I can’t get rid of the noise n matter what I do. Read more
Arduino Sleep Modes and RFI
Several folks suggested that I try putting my Arduino to sleep in an effort to reduce RFI with my relay controlled antenna switch. So, here are some experiments with Arduino sleep modes. Read more
Reducing RFI with PCF8574 GPIO Expander Board
I was able to use a PCF8547 GPIO Expander Board to reduce but not eliminate RFI from my Arduino. Here’s how that works. Read more
Tracking Down Antenna Switch RFI Ingress
Well, it’s settled. I have a major antenna switch RFI ingress problem. As much as 30 dB on some frequencies. Sigh. Read more
Antenna Switch Port Isolation Considered
My homebrew antenna switch port isolation is decent, but not great. But too much RFI is being fed though the outputs. Read more
SDR Antenna Switch Up and Running
My remote control SDR antenna switch is up and running. Now, I can switch SDR and antennas by remote control. Read more
Active Antenna Amplifier Relay Control
Wideband loop amplifiers are easily automated with active antenna amplifier relay control, all for a few dollars. Read more
Dual Channel Antenna Switch with Relays
My homebrew dual channel antenna switch is up and running. It let’s be switch pairs of antennas to a bunch of two channel diversity receivers. Read more