[time-nuts] HP 58503B GPS Time Reference

[nde]

My trusted 58503B displays strange values, this suddenly started a couple of
weeks ago.

TI values used to be within +- 50ns, now the monitoring software shows
values going between +- 500 ns!

 

What could be the reason for this? I replaced the internal UT+ GPS receiver,
same results.

 

Any ideas?

 

Thanks!

-Nick