this is why lots of people don't like auto tuners.
73
Colin, V A6BKX
----- Original Message -----
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, December 23, 2007 12:32 PM
Subject: Re: possible problem with output power on IC746
> Wow, Colin.
>
> Wonder what the auto-tuner in the TS480 does.
>
> 73 de KB8TYJ
>
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, December 23, 2007 2:27 PM
> Subject: Re: possible problem with output power on IC746
>
>
> > with an SWR of 1.1 to 1 on 20 meters with the ts2000, putting the tuner
> > inline, though it isn't needed and won't even tune because the swr is
> > already low enough, will show a power reduction of about 15 watts.
> > So a 15 percent power reduction with the onboard tuner in is quite
> > substantial.
> > unfortunately I didn't have the tw1 when i had the ts570, so i can't
> > compare
> > the two.
> > I suspect that a good quality outboard auto, or even manual tuner
wouldn't
> > have this much effect on power output.
> >
> > 73
> > Colin, V A6BKX
> > ----- Original Message -----
> > From: "John Miller" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Sunday, December 23, 2007 11:16 AM
> > Subject: Re: possible problem with output power on IC746
> >
> >
> >> Key the mic on CW as well, it will work. that seems strange though if
it
> >> showed high power before. Hopefully there's nothing going wrong. If you
> > have
> >> the tuner in the radio on, turn that off and see if that changes
things.
> >> I
> >> haven't checked on the TS-2000 yet but I know my 570, the tuner can cut
> > the
> >> power back a bit. Not that much, but it's something to check anyway.
> >> ----- Original Message -----
> >> From: "T Behler" <[log in to unmask]>
> >> To: <[log in to unmask]>
> >> Sent: Sunday, December 23, 2007 1:12 PM
> >> Subject: possible problem with output power on IC746
> >>
> >>
> >> > Hello all.
> >> >
> >> > I've developed a strange problem with my Icom 746 transceiver, that I
> >> > could
> >> > use some help with.
> >> >
> >> > I have noticed that, when using my talking SWR meter unit, I only
seem
> > to
> >> > get about 60% output power with an antenna that is resonant on 3.7
MHZ
> > and
> >> > which has a 1.1 to 1 SWR reading.
> >> >
> >> > Thinking that something might be wrong with my talking SWR meter, I
had
> > my
> >> > sighted XYL help me do some checking without the talking SWR meter,
> > using
> >> > the meter on the front of the radio.
> >> >
> >> > She helped me check the output power meter on the IC746 itself by
> >> > completely disconnecting the talking SWR meter, and then doing the
> >> > test.
> >> >
> >> > She tells me that, on the bottom scale of the meter, the SWR reading
> >> > for
> >> > my
> >> > resonant 80-meter dipole is indeed 1.1 to 1, which is just what I'd
> > expect
> >> > it to be. However, the power output percentage is only around 60%
when
> >> > the
> >> > RF
> >> > power knob is turned all the way to the right.
> >> >
> >> > I'm doing these tests in both CW and RTTY modes.
> >> >
> >> > When I do the test in RTTY mode, I simply use the PTT on the mic.
When
> >> > doing the test in CW mode, I simply have my paddles send a series of
> >> > "dahs".
> >> >
> >> > Could I have something set wrong with the 746, or is there something
> > wrong
> >> > with the rig itself?
> >> >
> >> > Is there something else I should try?
> >> >
> >> > I think I'll go play with my new TS480 now. (grin)
> >> >
> >> > 73 from Tom Behler: KB8TYJ
> >> >
> >>
> >>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG Free Edition.
> >> Version: 7.5.516 / Virus Database: 269.17.6/1193 - Release Date:
> > 12/22/2007 2:02 PM
> >>
> >>
> >
> >
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.17.6/1193 - Release Date:
12/22/2007 2:02 PM
>
>
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