I am going through my lab finally sorting things out. I have uncovered two STEL boxes I bought a while back. They are models 5430 and 5440. The 5430 is a "baseband coder" and the 5440 is a "coder/data demodulator". Because of the labels (e.g. P(Y) clock, C/A clock, etc), I believe these to be GPS widgets. Would anyone know more? Thanks!