Hi.

It would be interesting to see if the radio shows the same behavior when 
going into the dummy load with the auto tuner switched out.  I've noticed a 
phenomenon, which I don't quite understand, where putting an auto tuner in 
line will sometimes cause a radio to roll back the power even when the SWR 
looks good.  And, on my Kenwood TS690S, on 10 meters, it rolls the power 
back even on a good load UNLESS I switch the auto tuner in!  There sure 
seems to be some goofy things that go on that the instrumentation doesn't 
always reveal.

73, de Lou K2LKK



At 01:16 PM 12/23/2007 -0500, you wrote:
>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
> >
>
>
>
>
>--
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>12/23/2007 5:27 PM

Louis Kim Kline
A.R.S. K2LKK
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