[time-nuts] What signals if any are on the unpopulated SMC pads on the 58503A motherboard?

[Stan]

Hello,

 

Subject line pretty much says it all. I am using a newly-resurrected 58503A
and noticed some unpopulated SMC connector pads on the motherboard next to
the 1  PPS and the Alarm Output jacks. Curious if one of these might be an
IRIG-B output (or some other useful signal)?

 

Thanks,
Stan