[Elecraft] K3 on JT-65, ALC varies widely

[Joe Subich, W4TV]

TX ad RX EQ are forced to flat in DATA A (and AFSK A) mode.

What frequency tones (TX #### Hz in WSJT-X) are you using?  Is WSJT-X
in split mode?

If I adjust the audio input *carefully* to 4 bars, I will see the "ALC"
vary from 3 to 5 bars and the power output will vary between 98 and 102
Watts (when set for 100 W).  With the audio input adjusted to "4 bars
with the 5th flickering", I see marginally tighter power control - 99
to 102 W.  However, in no case is there a significant variation in the
power output.

The *only time* power output is not as expected is if I am not using
split mode and trying to transmit with audio tones below 300 Hz or
above 2500 Hz (outside the DSP bandwidth).

73,

    ... Joe, W4TV


On 4/16/2017 8:15 PM, Robie Elms wrote:
> I also see the same behavior as Dave.  I have verified my K3 is in DATA A
> and the TX Equalization is a flat line.  However,  I routinely make
> contacts with JT65.  I use WSJT-x v 1.7.0
>
> Robie - AJ4F
>
> On Mon, Apr 17, 2017 at 12:10 AM, Walter Underwood <wunder at wunderwood.org>
> wrote:
>
>> TX EQ could cause problems like this if not in DATA A.
>>
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
>>
>>> On Apr 16, 2017, at 4:52 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>>>
>>>
>>> Since bars 0-4 represent audio drive level and *not* true ALC when
>>> in digital mode (DATA A, AFSK A), what you are seeing represents a
>> significant change in *audio drive level* for the different tones.
>>>
>>> Are you sure you are using DATA A and not AFSK A with the AFSK
>>> Filter turned on?  What frequency range are the tones?
>>>
>>> 73,
>>>
>>>   ... Joe, W4TV
>>>
>>>
>>> On 4/16/2017 5:29 PM, Dave Hachadorian wrote:
>>>> I just started playing with JT-65 and JT-9 this weekend, and I’ve
>> already worked a bunch of DX, so it’s basically working ok.
>>>>
>>>> Transmitting on JT-65, I see a lot of variation in ALC and power as the
>> various tones change.  I’m using Data A mode with the stock 2.7 filter.  I
>> just had a QSO with tone frequencies of about 1800 – 1950 Hz, and ALC
>> varied from zero to five bars on the different tones.  Sound card output is
>> about 50%, and Line In level is at 12.  Is this variation normal, or am I
>> doing something wrong,  and where should I set the ALC?
>>>>
>>>> Thanks.
>>>>
>>>> Dave Hachadorian, K6LL
>>>> Yuma, Arizona
>>>>
>>>>
>>>>
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