Differences

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--- faq [2015/07/26 18:24] – c
+++ faq [2016/01/10 16:40] (current) – Unable to get any signal adlerweb
@@ Line 13: / Line 13: @@
 A: What looks like the antenna is just a design feature. ;-) The real PCB antenna is located somewhere else on the board.
-== You would like to start experimenting with SDR but do not have a rad1o badge (yet)?
+== I would like to start experimenting with SDR but do not have a rad1o badge (yet)
-You can buy an DVB-T dongle with an rtl2832 chip(~15Euro). They are not capable to send data, but have nearly the same frequency spectrum as the rad1o badge for receiving data. They work togeter with RF Analyzer (Android) as well as GNU Radio (Windows/Linux/Mac).
+A: You can buy a DVB-T dongle with an rtl2832 chip (~15 Euro). They work together with  [[software#rf_analyzer_android|RF Analyzer (Android)]] as well as [[software#gnu_radio_linux_mac_windows|GNU Radio (Windows/Linux/Mac)]]. They are not capable of sending signals, but depending on the dongle they have a frequency spectrum from 64 MHz up to 1700 MHz for receiving signals, which is enough for a lot of experiments.
 == Use by unexperienced people
@@ Line 30: / Line 30: @@
 A: There probably will be several applications on the rad1o badge itself (so it can be used standalone) like an FM-receiver, spectrogram display, controlling power outlets etc. Look forward to the ideas creative people at the camp will come up with...
+== Clock issues
+Q: How stable is the frequency? How much deviation should be expected?
+A: FIXME
+Q: There is a clock out, whatfor is it? Why is there no clock in? 3 Hardware versions?
+A: FIXME
+== Unable to get any signal
+Q: I am unable to receive a signal. Neither my PC nor the embedded rfapp show anything
+A: If you are using a bare unit without RF-shield or a case you might have damaged the RF section. Especially the SMD coils shown below (0603USB-951 common mode choke, 63NH, 0.5A) can easily shear off.
+{{ :rf-coils.jpg?100 |}}