Research Concepts RC3000 - Manual (Page 48)

RC3000 Antenna Controller Chapter 2 Installation
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2.2.13 Resolver Inputs
Original RC3000s
When the optional resolver input board (RC3000RSLVR) is required, J12 (DB15 Male on backpanel) is
used for azimuth and elevation position information.
Second Generation RC3000s
Individual connectors (DB-9 Female on backpanel) are provided as needed for each axis.
Suggested resolver cables would have three shielded, twisted pairs of 22 AWG (such as Belden 87777).