Sine Systems RFC-1/B - Page 24

The telemetry relay for a particular channel is energized as long as that channel is selected.
Only one telemetry relay can be energized at a time. Control relays are energized only when
one of the control tones ("*" or "#") is being received.
The power supplied to the RP-8 panels by the RFC-1 is approximately +10 volts, unregulated.
3.00.0
Circuit Description
page 6.2