{HEAD ~ a self test amplifier} connected to {TAIL ~ the self test oscillator} via a mixer to amplify the testing signals created by the self test oscillator; and 
connected to
{ HEAD ~ a self test amplifier } connected to { TAIL ~ the self test oscillator } via a mixer to amplify the testing signals created by the self test oscillator ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH