Do the DISS counters increment in all avionics difficulty modes, or just Realistic? On Advanced, I'm not noticing any increment/decrement with the counters enabled.
if orange lamp is lights, at least one counter should change it's value (usually FWD). if you not hovering of course.
ARK-15 has only one receiver and one pair of directional and non-directional antennas. so you can receive signal only from one station in same time. channel switch just change frequency of the receiver. second needle of radio-magnetic indicator can be used only with two receivers, inoperate in Hind as I know. by emergency ADF (ARK-U2, for rescue missions) or by route direction finder (Hind doesn't have it).