Hi, folks.  I really enjoy working with my TS480, but recently began 
having a problem.

When on 10 meters specifically from 28.00 to 28.400, I either get a cw 
SWR, or the thing keeps clicking until I  hear five fast short beeps.  
Aside from this band and 6 meters, no other bands are affected.  This 
even happens when i have the matched external antenna tuner plugged in 
and on AT2.

I'm using an UltraLite Junion, and given its specs, should have no 
problem tuning on this band.  The antenna is grounded through a ground 
rod and lightning arrestor.

Bottom Line: how can I fix this?  Thanks in advance.--Matt, N1IBB.