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Troubleshooting, noise and interference Homebrew gear does not always work first time. Even if it appears everything is constructed as per the circuit. Stages can be unstable. Amplifiers can oscillate. Noise from one part of the circuit may be getting in to sensitive radio and audio amplifier states elsewhere in the circuit. And you might be getting interference from electrical and electronic equipment around the house. Bad connections can not only prevent something from happening but also generate hard to find interference. These videos show problems I've had and how they have been solved.   Losing most of your signal - tests with lossy coaxial cable   Don't trust all SMA - SO239 connectors   Not all BNC connectors are equal   How much power is your QRP antenna coupler losing?   Fixing a QRP antenna coupler   Debugging an LM386 audio amplifier circuit   Troubleshooting a Pixie QRP transceiver kit   How to tame parasitic oscillations in variable crystal oscillators   Removing DDS generated noise from a QRP transceiver   Importance of inspecting and maintaining antennas (especially if used in salty air)   Hearing broadcast stations in the amateur bands? This could be why   The best thing you can do for your ham station (removing interference from local sources)   LED light QRM on VHF   Tracking down an interesting RF noise source outside   Disclosure: I receive a small commission from items purchased through links on this site. Items were chosen for likely usefulness and a satisfaction rating of 4/5 or better.

Books by VK3YE Ham Radio Get Started (USA) Australian Ham Radio Handbook (Aust) Hand-carried QRP Antennas More Hand-carried QRP Antennas 99 things you can do with Amateur Radio Getting back into Amateur Radio Minimum QRP Illustrated International Ham Radio Dictionary Make your Passion Pay (ebook writing)   All material on this site (c) Peter Parker VK3YE 1997 - 2024. Material may not be reproduced without permission. Read privacy policy.