[TenTec] swr

[John Molenda]

  Hi All , I have a TT Orion II and when I use it on 160 with a palstar 
auto tuner , TT Titan III 417Amp  and a new zero five vertical antenna 
The swr runs a muck.  This only happens with 250 watts or more , the swr 
will read on the radio or  tuner say 3.1:1  the Palstar auto tuner 
knocks it down to 1:1 and all is fine then all of a sudden maybe in the 
middle of a qso the swr will rise to 3 .1:1and I have to re tune and of 
course this will send the amp into a fault position . It is almost like 
the tuner just stops working .  I can't remember if this has happened on 
other bands but it will happen on 160 .  to answer some questions , no 
the tuner in the OII is not on when I use the palstar tuner .  And Yes I 
have 48 radials down at 45 foot each.  I use no grounding inside the 
shack but my antennas and coax are grounded outside the shack .  Is the 
problem the radio , tuner , amp or what .And by the way the antenna 
plays real nice on all other bands .   thanks for your input in advance 
.  all the best ! John kb2huk