You won't see the harmonics until you have a fairly good bit of clipping going
on. They start at a very low level and increase as the clipping gets worse.
Harmonics always exist...
Why can't the manuals simply tell you where 0dB ALC is? What a concept.....
You want ALC for phone...it doesn't matter there and maximizes your power. I
think all they did in the manual was copy one section to the other.
Any clipping/compression at all will degrade your signal....even if you can't
see it.
You want 100% level audio (with very few exceptions on some rigs with old audio
setups) coming from computer->soundcard. You adjust the gain in the receiver
and external soundcard if you have one (Signalink, RigBlaster, etc) to limit
the power.As I recall I've only had one rig where we couldn't get 90-95 watts
with no ALC.
Mike
On Thursday, June 6, 2019, 9:19:30 AM CDT, Roeland Jansen
<roeland.janse...@gmail.com> wrote:
In the Icom manual it states, “When operating in the SSB data mode, adjust the
device's output level to be within the ALC zone.” So contrary to the old rule
that ALCfluctuation is bad, that is not the case with these new SDR
transceivers. (from someone else's view)
The ALC zone is in this case anywhere between no deflection and approxumately
half way. There is a line drawn and outside of that line, you're getting in
trouble.
I tested this with the 7851 (200W out) and an IC7300 w/o antenna and it's as
clean as it gets. Overdriving far beyond the line, results in side skirts that
you easily can see at the scope.
(and then they are S1..2 while the carrier is at 9+40).
the copy/paste I did was from the 7851 manual
The 7300:
In the SSB mode, touch the TX meter to selectthe ALC meter and adjust until the
meter readingswings between 30 to 50% of the ALC scale
and 50% is halfway where the red zone ends. Now the red zone is the line as
mentioned before so you only need to keep it in th ALC zonde and not beyond.
I do have the mod levels of all the transceivers default and vary the output
with the slider in the wsjtx s/w
now. for the fun of it
9700 USB mod level 50% as per default.TX slider is at -20.1 dBALC is now at the
end of the red line so just in the limit; Output is 10.3W on 23. output looks
clean.At -37.2dB there is no deflection of the ACL anymore, output is 5.9W at
23.
The 7300 shows similar values where ALC is deflected and the 7851 does not
"see" garbage
7851
USB level as per default 50%TX slider is at -20.4 dBALC is at the end of the
red line, in limit, output is 207W; the 7300 scope as rx does not see garbage
left/right
At -36.8 dB ALC starts deflecting; Output is 206W.
Don't know if that gives you some insight.
On Thu, Jun 6, 2019 at 2:18 PM Black Michael via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Gary -- I've work on a dozens of rigs...probably including all the ones you
have.
If you are unable to get at least 90W with no ALC then something in your audio
path is incorrect.
I'd like to work with you and ensure that either my directions need updating or
your settings need updating.
Did you follow the procedure in the document I sent? That has worked on every
rig/audio combo I've tested which is over 300 operators now.
Can you call me an we can hook up and figure this out? Gotta' make sure the
info I'm putting out is as inclusive as possible.
321-690-2551Mike W9MDB
On Thursday, June 6, 2019, 1:24:58 AM CDT, Gary - K7EK via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Absolutely. I own six different Icom HF rigs. All of them put out minuscule
power unless there is a significant deflection on the ALC meter. The no ALC
warning does NOT apply to all rigs. I agree with RTFM. You cannot go wrong.
Best regards,
Gary, K7EK
Radcliff, KY (EM77at)
Sent from BlueMail On Jun 5, 2019, at 15:42, Ron WV4P <wv4...@gmail.com> wrote:
Contrary to common belief.. You better feed that 7300 some ALC if you want it
to perform. All radios are NOT the same and some need ALC. Ron, WV4P
On Wed, Jun 5, 2019, 2:34 PM Tom Ramberg via wsjt-devel <
wsjt-devel@lists.sourceforge.net> wrote:
Sorry for posting this in the wrong thread. Now Trying to delete it and
repost-
OH6VDA Tom
Sendt fra min iPad Air 2
5. jun. 2019 kl. 22:26 skrev Tom Ramberg < oh6...@yahoo.com>:
I just checked my computer soundcard settings and followed your procedure to
set up the radio, the computer and the tranceiver, resulting in a seemingly
dramatic enhancement of operation efficiency. For one thing (operator error, no
doubt), I've never checked that the sound card sample rate was 48kHz 16-bit
before, and of course it was not. Thanks a lot!
73 de Tom OH6VDA
Sendt fra min iPad Air 2
5. jun. 2019 kl. 15:01 skrev Black Michael via wsjt-devel <
wsjt-devel@lists.sourceforge.net>:
For the IC-7300 you want the ALC meter to show no action at all. So if it
ever bumps up at all you've got too much audio going into the rig and need to
back off the USB Mod Level.
You should be able to transmit 100W with no ALC (or very close to 100W).
That is the goal of all rigs....some of the newer rigs will show < 0dB ALC
(e.g. K3) though so it pays to learn what your ALC meter is really telling you.
The way you do that is set your rig for 100W, WSJT-X power slider at -3dB,
computer audio out at 0dB, then adjust rig/external sound to show 50W tranmit
power going out. That should be 0dB ALC and shows you what to expect when
transmitting close to the 100W. Many rigs cannot do 100W with no ALC so have
to back off to 95W maximum or such. So as you gradually increase the power
slider in WSJT-X (use the up cursor key) watch your ALC as you approach 100W.
If you start seeing ALC you have to back off the audio level at the rig or
external sound card so the WSJT-X slider can be at 0dB and no ALC showing.
de Mike W9MDB
On Tuesday, June 4, 2019, 12:06:34 PM CDT, Black Michael via wsjt-devel <
wsjt-devel@lists.sourceforge.net> wrote:
If you reduce power from WSJT-X (not from the rig) does your ALC drop?
If so...that's too much audio.
Mike
On Tuesday, June 4, 2019, 11:57:44 AM CDT, Gene Marsh < w8...@me.com>
wrote:
Mike,
My ALC is ~25% @80W. But, I have no issues with transmit. Only observing
the double decode. Everything else is good.
73 de W8NET Miles / “ Gene” Secretary, Portage County Amateur Radio Service
(PCARS) 3905 Century Club - Master #47 DV2/W8NET in the Philippines
Licensed since 1974
On Jun 4, 2019, at 12:46 PM, Black Michael < mdblac...@yahoo.com> wrote:
I do believe 63% audio on the IC7300 is wayyyyyy too much audio. What
does your ALC meter say?
de Mike W9MDB
On Tuesday, June 4, 2019, 11:44:04 AM CDT, Gene Marsh via wsjt-devel <
wsjt-devel@lists.sourceforge.net> wrote:
Joe,
My setup:
Windows 10 Pro - see the pic:
<image1.jpeg>
-rc7 IC-7300 USB audio codec @66% volume
Need more info?
I will try to save a wav file next time I see it.
73 de W8NET Miles / “ Gene” Secretary, Portage County Amateur Radio Service
(PCARS) 3905 Century Club - Master #47 DV2/W8NET in the Philippines
Licensed since 1974
On Jun 4, 2019, at 12:12 PM, Joe Taylor < j...@princeton.edu> wrote:
Hi Gene,
I have seen nothing like the duplicate decodes you report. Please send us the
.wav file for one or two of your examples, and tell us something about your
computer setup.
-- 73, Joe, K1JT
On 6/4/2019 11:39, Gene Marsh via wsjt-devel wrote:
FT4: I have seen 7-8 times, double decoding. Always a strong signal. Example:
image1.png
I saw that in the early days of FT8.
Except for that, it’s working really well. (Thank you Joe and your team)
73 de W8NET Miles / “Gene”
Secretary, Portage County Amateur Radio Service (PCARS)
3905 Century Club - Master #47
DV2/W8NET in the Philippines
Licensed since 1974
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