when did this problem begin?
or is this the first time you have noticed it?
Also, how long did you transmit on the 746 with the G5RV having a high SWR
on 40 and 80?
If you transmitted regularly with a high swr, the finals could be going
south.
i presume you don't have a tuner or some other device in line between the
rig and the SWR meter right?
73
Colin, V A6BKX
----- Original Message -----
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, December 23, 2007 3:26 PM
Subject: Re: possible problem with output power on IC746
>
> John:
>
> My XYL and I tried it with the auto-tuner totally turned off, even in the
> menu, and, even though we had a flat 1.1 to 1 SWR reading, we only had
about
> 60% power output on the highest possible power setting on the IC746.
>
> Rather strange, and a bit disconcerting.
>
> 73 from Tom Behler: KB8TYJ
>
>
> ----- Original Message -----
> From: "John Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, December 23, 2007 3:08 PM
> Subject: Re: possible problem with output power on IC746
>
>
> > Most radios you just push the tune button quickly and that will turn it
> > off.
> > I'm not familiar with that radio but I'd think that's how it is.
> > ----- Original Message -----
> > From: "T Behler" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Sunday, December 23, 2007 2:28 PM
> > Subject: Re: possible problem with output power on IC746
> >
> >
> >> Lou:
> >>
> >> I don't have a dummy load here, but am planning to order one of the
> >> 300-watt
> >> dry dummy loads from MFJ whenever I get the bucks.
> >>
> >> In the meantime, I'm going to see what I can do to totally take the
> >> automatic antenna tuner out of the circuit, and see what happens.
> >>
> >> I'll probably have to go into some menu setting to accomplish that.
> >>
> >> I sure hope it's nothing wrong with the 746, but at least if it is, I
> >> have
> >> the TS480 now to use.
> >>
> >> 73 from Tom Behler: KB8TYJ
> >>
> >> ----- Original Message -----
> >> From: "Lou Kline" <[log in to unmask]>
> >> To: <[log in to unmask]>
> >> Sent: Sunday, December 23, 2007 2:15 PM
> >> Subject: Re: possible problem with output power on IC746
> >>
> >>
> >>> 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
> >>>> >
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>--
> >>>>No virus found in this incoming message.
> >>>>Checked by AVG Free Edition.
> >>>>Version: 7.5.516 / Virus Database: 269.17.7/1194 - Release Date:
> >>>>12/23/2007 5:27 PM
> >>>
> >>> Louis Kim Kline
> >>> A.R.S. K2LKK
> >>> Home e-mail: [log in to unmask]
> >>> Work e-mail: [log in to unmask]
> >>> Work Telephone: (585) 697-5740
> >>>
> >>>
> >>
> >
> >
>
>
>
> --
> 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
>
>
|
