I wouldn't put a lot of stock in the 590 meter either.  All this can be 
set in the service me4nu.  You can make all kinds of adjustments, not 
for the faint of heart for sure.  You can set alc, actual power using an 
external meter.  After this is done you set another menu so it 
recalibrates the reading you see on the radio.  Same is true of alc.  If 
you change that setting, you can recalibrate the radio's alc setting. 
It is all relative anyhow.  The tw1 isn't accurate at ll.  A good 
relative indicator and the tone is worth what they cost.  I've also used 
the tuning aid discussed a while back on this list.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Thu, 13 Dec 2012, 
Tom Behler wrote:

> Hey, all.
>
> As I have addressed my most recent issue with the TS590 DC power cable, I
> have noticed something interesting with my TW1 swr/watt meter.
>
> Actually, I thought I already knew this, but my most recent readings have
> reminded me of the issue.
>
> Now, with both of my TS590 power cables, when the rig is set to 100 watts
> output, I consistently get 100 watts as a power reading on the TS590's
> internal meter.
>
> However, when using the LDG TW1 talking watt meter, my readings can vary
> anywhere from 85 to 91 watts, with occasional dips as low as 81 watts.
>
> Keep in mind that all of these readings are taken on a resonant frequency
> with my Alpha Delta DXCC antenna and an SWR of 1.0 to 1.  Also, I get the
> same reading variations with the TW1 when using a dummy load.
>
> I checked the TW1 manual, and they clame an accuracy of plus or minus 5
> percent on 14 mhz, but I think that is debatable.
>
> On the other hand, do we know how accurate the TS590's power meter is as
> well?
>
> I'm not one to quibble over 10 or 15 watts, but I find the inconsistent
> readings with the TW1 to be at least interesting.
>
> 73 from Tom Behler: KB8TYJ
>
>