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
>
>
|
