most newer dual band type ham rigs will do split tone as well.
They do split tone in commercial applications to create multiple user groups 
on one repeater pair.
Personally, I never ever use RX tone  for allot of reasons.
Unfortunately, some newer hams don't fully understand the concept and stick 
rx tones in their radios...then can't figure out why they can't hear 
anything when the tone is wrong, or when the tone board on the repeater goes 
dead.
Or, with some repeaters, there is only an input tone, and the repeater 
doesn't transmit a tone, but when some of these guys program their radios, 
they put a tone on both tx and rx and then can't hear the repeater.
Anyway, leaving the rx tone off is always a good idea.
The only time it's useful is if you are in a very noisy RF environment where 
you get allot of interference or noise on your receiver...the rx tone will 
block most of that and allow you to listen in piece most of the time.

73
Colin, V A6BKX
----- Original Message ----- 
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, November 05, 2012 1:56 PM
Subject: Re: TS480/SAT in FM operation


> PL and CTCSS is exactly the same thing, what you're talking about is
> something else but that doesn't make sense at all. If you need a split 
> tone,
> in other words different from receive to transmit, set the transmit tone 
> and
> leave receive tone off, you'd be out of luck and that would be crazy since
> only commercial radios do that as far as I know though I did trick a ham
> radio to do it once. Anyway, as long as the tone is the same for in and 
> out,
> when you turn on tone squelch, so you need a tone to receive the repeater,
> it will transmit that same tone when you transmit so you have the tone set
> for receive and transmit that way.
> ----- Original Message ----- 
> From: "Bob Ray" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, November 05, 2012 3:34 PM
> Subject: Re: TS480/SAT in FM operation
>
>
>> PL tones are the tones going into the repeater.  CTCSS are those
>> transmitted
>> by it.  That is the best explanation I can come up with that makes sense
>> to
>> me.
>>
>> Bob
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators 
>> [mailto:[log in to unmask]]
>> On Behalf Of Lou Kolb
>> Sent: Monday, November 05, 2012 2:32 PM
>> To: [log in to unmask]
>> Subject: Re: TS480/SAT in FM operation
>>
>> Bob,
>>
>> I thought they were the same.  Perhaps I'm misunderstanding what you mean
>> by
>> ctcss and Pl tones, but I thought both those terms refered to a tone
>> that's
>> transmitted continuously as long as the transmitter is up to hold the
>> squelch open on the receiving end.  I'm sure someone will correct me if
>> I'm
>> wrong.  73,  Lou Lou Kolb Voice-over Artist:
>> Radio/TV Ads, Video narrations
>> Messages On-hold:
>> www.loukolb.com
>> ----- Original Message -----
>> From: "Bob Ray" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Monday, November 05, 2012 3:11 PM
>> Subject: TS480/SAT in FM operation
>>
>>
>>> Anyone that has experience with the 480 on fm repeaters may be able to
>>> help with this.  We have just added tones to our local repeater.  The
>>> 480 manual, if I am reading it right, doesn't allow you to have a pl
>>> tone and a CTCSS tone at the same time.  Does anyone have a work
>>> around for this?
>>>
>>> Bob kd0br
>>