Don't get me started on the clowns at YAESU,
years ago i bought a new t100d, they were notorious for vswr icon coming on due to oscillation especially in mobile setups & many went back for updates including new radios before they were sold,
YAESU clowns did some ugly mods covering relays in copper foil soldering straps to coax connectors drilling the chassis, grounding clips for coax connections , different mods to different peoples radio's,
they clearly had no idea what was going on & were searching blind for a resolution,
my ft100d started doing the same thing so i was having a poke around & found that when i pressed the case hard at the rear it stopped, if i removed the case it stopped
looking inside i see copper foil right where im pressing & copper foil on the sides doing nothing at all because it was not making contact with the chassis they put it between the screw holes rather than over them where it would make a connection,
i got my meter out & found that the internal coating on the case was none conductive,
the only grounding was via the two small pieces of copper tape making a capacitive coupling & mine had gone tarnished,
the case was coupling rf from one place to another causing oscillation,
i remove the small foil and the useless foil on the sides & replaced it with wider longer stuff across the screw holes so it made contact with the chassis giving a MUCH better capacitive coupling for the case,
measuring my new grounding caps/foil i had about 20x the capacitance of the YAESU bodge if i remeber correctly
The stupid shit YAESU clowns did defacing my new radio at the factory were removed,
VSWR icon & oscillation as never returned.
i think AMPOWER is their tech at the factory.
years ago i bought a new t100d, they were notorious for vswr icon coming on due to oscillation especially in mobile setups & many went back for updates including new radios before they were sold,
YAESU clowns did some ugly mods covering relays in copper foil soldering straps to coax connectors drilling the chassis, grounding clips for coax connections , different mods to different peoples radio's,
they clearly had no idea what was going on & were searching blind for a resolution,
my ft100d started doing the same thing so i was having a poke around & found that when i pressed the case hard at the rear it stopped, if i removed the case it stopped
looking inside i see copper foil right where im pressing & copper foil on the sides doing nothing at all because it was not making contact with the chassis they put it between the screw holes rather than over them where it would make a connection,
i got my meter out & found that the internal coating on the case was none conductive,
the only grounding was via the two small pieces of copper tape making a capacitive coupling & mine had gone tarnished,
the case was coupling rf from one place to another causing oscillation,
i remove the small foil and the useless foil on the sides & replaced it with wider longer stuff across the screw holes so it made contact with the chassis giving a MUCH better capacitive coupling for the case,
measuring my new grounding caps/foil i had about 20x the capacitance of the YAESU bodge if i remeber correctly
The stupid shit YAESU clowns did defacing my new radio at the factory were removed,
VSWR icon & oscillation as never returned.
i think AMPOWER is their tech at the factory.