Installation guide

Troubleshooting
Block Descriptions for Option UNJ and Option 506
1-137
back to the A15 Sampler. The other portion of the YO signal is routed through the A16 Frac-N to the
A13 Output. For Option 506, the YO is coupled off of the A21 YTO Driver and routed to the A14 Extended
Frequency Output. The A15 Sampler uses the YO signal to generate a fine tune voltage, which is routed back
to the A21 YTO Driver. This voltage is summed with the coarse tune DAC voltage and converted to a current.
The current is used to bias the main coil and fine tunes the YO. The YO is split on the A13 Output with a
portion of it being routed to the rear panel as the coherent carrier (COH Carrier).
For high modulation rates, the baseband FM is routed from the A16 Frac-N to the A21 YTO Driver. The
signal is scaled and then used to bias the FM coil and tune the YIG.