most modern rigs do not depend upon full output to insure a 50 ohm load
though.
I think the meter has a 5 per cent stated window of error.
This would include SWR readings as well as power readings.
73
Colin, V A6BKX
----- Original Message ----- 
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, November 15, 2006 6:49 AM
Subject: Re: TW1 Inconsistancy


> Not to mention, if the reading at first is with the SWR off and the
radio's
> cutting back, you hit the tuner and get the radio up to the 100 watt out
put
> again because it's seeing a load it likes, that can vary the readings a
> little too.
> ----- Original Message ----- 
> From: "Butch Bussen" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, November 15, 2006 6:07 AM
> Subject: Re: TW1 Inconsistancy
>
>
> > Actually, the internal tuner can effect the readeings.  If you want an
> > accurate reading, be sure the tuner is off.  The tuner makes the radio
see
> > 50 ohms, but the impedence of the line and load on the output, the
> > antenna, and the load back toward the radio, the tuner, can be far from
50
> > ohms.  The meter is designed to run in a 50 ohm circuit, which it isn't
> > any more.  I fought this battle a while back trying to tune up a six
meter
> > antenna on the 2000, and got all kinds of strange readings until I
> > remembered to turn off the tuner.  The tuner does effect things, because
> > it can present a high impedence to the meter on that end.  Also, you'll
> > find that sometimes just changing the length of the cable between the
rig
> > and the meter can change readings.  I had a regincy 2 meter rig once and
I
> > was just a beginner in all this stuff.  I had run another radio on my 2
> > meter beam and knew the beam was working great.  The regincy worked
great
> > on my mobile, but when I hooked it up to the beam, no output.  As they
> > came from regincy, they were very sensative to a "high s w r", and would
> > shut down.  I thought o.k., I'll check the swr.  Put the meter in the
> > line, and radio worked fine.  Took the meter out, and no output.  I
> > finally found that by either adding 6 inches or cutting six inches off
of
> > the line made the thing work.  It was dependant on exactly where in this
> > run of 70 feet of coax the radio was.
> > This is why if you are checking the s w r on a 72 ohm line, you have to
> > change some resisters in the meter so it matches the line.
> > 73s
> > Butch Bussen
> > wa0vjr
> >
>