Yep, Colin, Ihear you!
73 de KB8TYJ
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, December 23, 2007 2:35 PM
Subject: Re: possible problem with output power on IC746
> 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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