SWR effects the receive as well as the transmit so yeah, an external tuner 
will change the receive as you tune it as well as the transmit SWR, if you 
set the internal tuner to work on receive as well, you'll also notice after 
it tunes the receive will be up a bit. I have my TS-2000 set that way for 
that reason, if the receive is noticeably down from usual, I know to double 
check the tuning.
----- Original Message ----- 
From: "Howard Kaufman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, March 28, 2010 7:25 PM
Subject: ts480 test


>I don't trust my observation, so I'd like somebody else to test it.  After 
>a
> day of experimentation, I think that using my ts480 with an external 
> tuner,
> provides a better signal to noise ratio after tuning the antenna, than 
> does
> bypassing the external tuner and using the internal tuner.  I don't use 
> the
> internal tuner on receive.
> I'd like an observation and an explanation.  Seems surprising to me.
> H T Kaufman MSW LCSW
> Adaptive Technology Instructor