Tsebi Projects Forum

The JR modules uses a 5-pin connector for their transmitting modules. These carry power and the PPM/PCM signal that the module needs to send out the RF signal, and returns it to the antenna. IMG_0942a.JPG IMG_0939a.JPG The pin-assignments for the connector are as follows:- IMG_0943a.JPG The PPM sign...

The board currently works but preliminary tests suggests that it might be good to shield the detection circuit as it is very sensitive to changes. Future board layouts should be more symmetrical in terms of trace lengths for the signal paths. The linear regulator is getting pretty hot so we should p...

Most video diversity units out there rely on sync-detection or RSSI in order to determine the best antenna/receiver choice. Both these systems are weak though, with the RSSI method being marginally better than the sync-detection method. This project uses a novel method of assessing the best signal. ...

The following trace is from the Multiplex Royal evo9. The first thing you notice is the large voltage swing - up to 8V relative to ground (0V). This could pose issues to inputs expecting TTL compliant levels or inputs that are not tolerant to the higher voltages. In this trace, the vertical recticle...

The attached file is the scope trace of the PPM data stream from the JR9XII (equivalent to the JR9303). The trace is taken relative to the shield line from the D.S.C. port behind the radio. The vertical recticle is 500mV, and the horizontal recticle is 2.0ms. JR9XII_PPM.jpg You will notice that the ...

This thread is to journal the developments made with this collaborative project with Thomas Scherrer (OZ2CPU).