To get 200 watts out, you will need either a single power supply that 
can put out 41 amps, or a pair of supplies that will do at least 20.5 
amps each.  There are 2  inputs on the radio so you can use  2 supplies 
if you wish, but the output voltages need to be set very close to each 
other.   I forget what the max difference between the supplies is, but 
this is all stuff to consider before  putting out the money.

I had no experience with the 570, but I found the auto tuner in the 480 
is quite good.  If you get the 100 watt model with the tuner, you may 
find that it matches things your  old 570 would not.   Then you could do 
away with some of those external tuners  you spent money on, or maybe not.

73, Steve KW3A

On 7/14/2012 6:45 PM, Pat Byrne wrote:
> I agree with Butch.  The extra 100 watts might increase your local
> RFI and not make a whole lot of difference in your signal
> strength.  And Universal Radio are good guys.
> Pat, K9JAUAt 05:36 PM 7/14/2012, you wrote:
>> Personally, I'd go for the 100 watt with the tuner.  If not, you'll need
>> a larger supply and probably an external tuner.  I felt the same way you
>> did when I bought my 590.  I asked hro in Debnver and they wouldn't
>> install the voice board.  I called universal radio and got radio for the
>> same price and they installed the board free.
>> 73
>> Butch
>> WA0VJR
>> Node 3148
>> Wallace, ks.
>>
>>
>> On Sat, 14 Jul 2012, Harry
>> Brown wrote:
>>
>>> Hi all,
>>> Well folks, yes, I have been bitten, severely, by the hf bug.
>>> Now that my ham friends in my building, are back on hf with the Kenwood =
>>> 570, I am going to buy an hf rig!
>>> I've called ham radio outlet, and they have the kenwood ts480HX, that is =
>>> the 200 watt rig!
>>> I'm wondering about the vgs1 speech board, did I get that name right? =
>>> Anyway, I don't know how to put the speech board in, so, I wonder if ham =
>>> radio outlet would put it in for me?
>>> Or, is it something a blind ham can do?
>>> I bet it is, but folks, I don't want to ruin a new radio!
>>> So, I'm all ears!
>>> 73,
>>> Trippy, ac8s, who can't wait to get his own hf station on the air!
>>>
>>>
>
>
>