> I set the LINE IN gain to 30 (midrange).
This is generally too high - I run between 10 and 15.
The speaker output is set to 90%,
Are you running the "bare" speaker output to the Line In or
do you have a 10:1 (20 dB) attenuator between the speaker
output and the Line Input?
but there is an amplitude slider in WSJT-X, and I adjusted that to 5
bars of ALC in WSJT Tune mode (constant 1100 Hz tone in this case).
This is the *WORST PLACE* to adjust the level. Set the WSJT-X slider
to max and make an attenuator with a 10K resistor from the speaker out
to the top of a 1 K pot and connect the wiper of the port to Line IN.
Adjust drive with the pot.
On an external analog wattmeter, I could see the power ramping up on
some of the longer duration tones.
This is a symptom of insufficient audio drive and/or failure to
properly perform Transmitter Gain CAL (in the K3 Utility).
> So then I took an oscilloscope and measured the audio voltage coming
> out of the sound card, and found that each tone has a different
> voltage level coming out of the sound card! The audio level varies
> all over the place as the CQ goes on.
Contact the WJTS-X development team - their list is:
wsjtgr...@yahoogroups.com
73,
... Joe, W4TV
On 4/17/2017 1:43 PM, Dave Hachadorian wrote:
I am working on this some more this morning.
I set the LINE IN gain to 30 (midrange). The speaker output is set
to 90%, but there is an amplitude slider in WSJT-X, and I adjusted
that to 5 bars of ALC in WSJT Tune mode (constant 1100 Hz tone in
this case). The K3 is definitely in DATA A mode.
Then I called CQ, and the ALC meter and power output were all over
the place from 0 - 5 on ALC, and 10 Watts to 70 Watts on power
output. On an external analog wattmeter, I could see the power
ramping up on some of the longer duration tones.
So then I took an oscilloscope and measured the audio voltage coming
out of the sound card, and found that each tone has a different
voltage level coming out of the sound card! The audio level varies
all over the place as the CQ goes on. JT-65 is supposed to be
constant amplitude tones of 65 different frequencies, so something is
not working right, either in the WSJT-X program or in my computer. I
will look into that some more. It is not a K3 problem.
I am using WSJT-X v. 1.7.0 r7405. The sound card is an old
Soundblaster Live that works just fine for transmitting WAV and live
microphone on SSB.
Anyway, I am making QSO’s, some of them with signal strength as low
as –25 dB. I don’t think I am long for this mode anyway. Life is
too short for 1 Baud communication.
Dave Hachadorian, K6LL Yuma, Arizona
-----Original Message----- From: Don Wilhelm Sent: Sunday, April 16,
2017 7:41 PM To: Brian Hunt ; Reflector Elecraft Subject: Re:
[Elecraft] K3 on JT-65, ALC varies widely
Brian,
Try this -- set the K3 LINE in gain to somewhere near mid-range, and
then adjust the soundcard "speaker" slider to give you close to the
4 ALC bars with the 5th bar flashing. Refine that level with slight
adjustments to the LINE in gain.
You can use TX TEST while making those adjustments which will not
transmit any RF.
Adjust the desired power output with the power knob.
If you do not achieve the required number of ALC bars, the K3 will
"power hunt" causing significant fluctuations in the output power.
There seems to be a greater number of questions about this "problem"
for users of "JT" software than for other soundcard data modes. I
don't know why because the "JT" software should be no different than
any other soundcard data mode. Perhaps the user is trying to follow
the recommendations in the JT mode instructions (I have not looked at
them), but typically data mode instructions are for non-Elecraft
tranceivers and say that the user should set the power to maximum and
use the soundcard audio to adjust the power level. That does not
work with Elecraft gear which controls power differently than other
amateur transceivers. For Elecraft transceivers, adjust the audio
level as specified and adjust the desired power with the power knob.
I cannot stress this fact enough.
73, Don W3FPR
On 4/16/2017 9:19 PM, Brian Hunt wrote:
Don't see a problem with making minor adjustments of the Line In
gain during the first transmission. When I adjust the level using
the WSJT TUNE button I usually see the wild fluctuations mentioned.
A small "tweak" to the gain will set right.
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