Every radio I've ever checked with the internal tuner, regardless of brand, 
the power drops about that much with the internal tuner. It seemed a lot 
better with the older motorized tuners, but with the relay tuners internal, 
it seems to always drop about 15-20 watts depending on band.
----- Original Message ----- 
From: "Steve" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, January 02, 2012 10:37 AM
Subject: Re: More power output readings--now doubting accuracy of LDG TW1


> Tom,
>
> First, I think others have indicated that the TW1 isn't the most accurate
> thing around.  I don't know that the internal meter in the 590S will be 
> any
> more accurate, but it can't be less.  I don't own a TW-1 so I can't speak 
> as
> to whether there is any facility to adjust it.  As long as you are into
> intellectual pursuits, why not borrow somebody's Bird Wattmeter, with the
> proper element installed and take some measurements compared to your TW1.
>
> Second, I've noticed on my TS-2000, and I assume that the 590S will be
> similar, that there are losses when using the internal antenna tuner.  My
> relative power is down about 14-20 watts when using the internal tuner
> versus using an external tuner.  I think Bob, K8LR has had similar 
> results.
>
> Steve, K8SP
> ----- Original Message ----- 
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, January 01, 2012 2:45 PM
> Subject: More power output readings--now doubting accuracy of LDG TW1
>
>
>> Hi, folks.
>>
>> I know, I know, it's just the professor in me, but this output power 
>> issue
>> I've been dealing with is intellectually interesting, if nothing else.  I
>> fully realize that 20 watts either way isn't going to make a difference 
>> in
>> terms of who hears me, how well they hear me, etc., but I have to report
>> on
>> my latest set of output power readings this morning.
>>
>> First of all, When I use my Astron RS35 power supply, and take output
>> power
>> readings with the watt meter on the TS590, things now seem to be pretty
>> stable at 100 watts output on either a resonant frequency for one of my
>> antennas, or when using the TS590 auto-tuner.  Obviously, the resonant
>> frequency readings are going to be the  most revealing, so those are the
>> ones I have the most faith in.
>>
>> What I still don't understand is why my LDG TW1 seems to be about 20 
>> watts
>> off with its output power readings.  For now, I'm going to go with the
>> readings the radio gives me, since the rig is what needs to be kept 
>> happy.
>>
>> Between Mike Duke  and Steve Forst, I do have some good instructions if I
>> ever want to tweak the output voltage on the Astron RS35, but I think 
>> I'll
>> hold off on doing that for a while until I see if things remain as stable
>> as
>> they are right now.
>>
>> Thanks to all for your your continued interest in, and help with this
>> issue.
>>
>> 73 from Tom Behler: KB8TYJ