If you can be confident that peaking for maximum received noise corresponds 
to a reasonably low SWR, you could use the rig's tuner to deal with what's 
left. I assume that this is a manually controlled tuner. If it was 
automatic, then I would be concerned about the tuners "fighting with each 
other" as they are both automatically tuning your system. The optimum 
solution would be to have your TW-1 in the line and do all of the SWR 
minimization in the external tuner, and run the rig with its internal tuner 
disabled.
73,


Lloyd Rasmussen, W3IUU, Kensington, MD
http://lras.home.sprynet.com
-----Original Message----- 
From: Dave Basden
Sent: Monday, June 29, 2015 4:38 PM
To: [log in to unmask]
Subject: Re: RV DXCC Question (WAS) Your First Message Arrived

Hi Tom,

Everyone seems to think using an internal tuner and an external tuner
together is a bad idea.  I'm not knowledgeable enough to contradict
that.  You were talking about gettings the MFJ noise bridge.  That's
an excellent way to adjust for minimum SWR.  I got one to use with my
tube-type amplifier, but am not using it since getting the ALS-600
and MFJ-998.  It would sound like a perfect option for you in the RV.

73,

Dave, W7OQ

At 12:16 PM 6/29/2015, you wrote:
>Dave:
>
>I understand, but here's my major question.
>
>Perhaps I should have just sent another e-mail with just this question:
>
>Don Terrell from Alpha Delta Engineering suggests that I simply use a
>wide-ranging tuner with my DXCC antenna out at the RV as it currently is,
>and call it good.
>
>So, here's what I'm thinking:
>
>I have an old MFJ 901B manual versatuner that is not being used for 
>anything
>right now.
>
>Could I use that to basically tune the antenna, using receive noise as my
>indicator, and then just touch things up with the internal auto-tuner in 
>the
>TS480?
>
>I have always heard that doing this would cause the tuners to work against
>each other, which could create real problems, but I never knew whether that
>was true or not.
>
>Of course, I do have an LDG TW1 talking SWR/watt meter at the home qth, but
>hate to tear things apart to use it during the relatively short times when
>we are camping.
>
>Does anyone have any wisdom on this latest idea?
>
>Tom Behler: KB8TYJ
>
>
>
>
>
>-----Original Message-----
>From: Dave Basden [mailto:[log in to unmask]]
>Sent: Monday, June 29, 2015 3:04 PM
>To: Tom Behler
>Subject: Your First Message Arrived
>
>Hi Tom,
>
>Perhaps the lack of comment was because everyone was recovering from Field
>Day, but your message did get through earlier.  As for using the antenna
>despite the high SWR, I would say that if the TS-480 will tune it then use
>it.  If the SWR is beyond its capacity, then perhaps an external tuner 
>would
>give a match.  After that it's a matter of whether you can make contacts on
>20.  If so the SWR isn't something to worry about.
>
>73,
>
>Dave, W7OQ