Can anybody give me an idea of what is causing this problem with my IC27A?
(I know its 25 years old,but don't laugh, it's paid for).

I am trying to use the radio through several repeaters that require a CTCSS
(PL) tone to access the repeater.
I do not have this problem with repeaters that do not require a PL.

When I am far away from the repeater I use high power (25W) and the PL.
As I get closer to the machine using Hi power, I get to a point where I
cannot access the repeater using PL and Hi power.
If I cut back to low power ( 5w ) and PL the radio will access the rptr.
If I move farther away from the repeater at some point I can again access
the rptr on high power.

Dan
AI8O