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
>>>
>>>
>>
>
>