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
>> >
>>
>>
>>
>> --
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>> Version: 7.5.516 / Virus Database: 269.17.6/1193 - Release Date:
> 12/22/2007 2:02 PM
>>
>>
>
>
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