Show pagesourceOld revisionsBacklinksExport to PDFBack to top Share via Share via... Twitter LinkedIn Facebook Pinterest Telegram WhatsApp Yammer RedditRecent ChangesSend via e-MailPrintPermalinkHelp and Support × Table of Contents RF Board Test & Fehlersuche Symptom: No reception on any band Discussion english stub RF Board Test & Fehlersuche Note: ToDo Some general hints here Symptom: No reception on any band Note: ToDo: In text below: adapt component numbers once OVI40 RF board schematics are public. Component numbers mentioned now are mcHF specific Touch certain points on the RF-board with a multimeter test-cord, a piece of cable or similar. A test-cord with measuring tip is well suited for this. Please listen to auio out (speakers or head phones) while doing this. If there is no sound when touching the base of Q1 there certainly is a hardware problem. This could also have something to do with the mixer or local oscillator. In case there is also no sound when touching the collector of Q1then this indicates a mixer problem, an issue in the subsequent operational amplifier or or in the audio codec including its switching mimic. Since the signal path after the mixer is low frequency audio this can also simply be verified by touching with a finger for initial empirical testing. You could leave a comment if you were logged in. en/ovi40test/rfboardtest.txt Last modified: 08.02.2018 20:53by df9ts