Again YES and NO
When I tune my FT450 on 15m (using 35 watts on data psk or rrty) it wipes out my Navbox.
I don't use 15m that often so not a problem.
All other bands and modes no problem.
I have my Navbox and radio shack in VERY Close together (a matter of feet).
When using Voice (max 50watts) on 20,40,80 metres NO problems at all.
Charlie
2E0VDS