locked FT8 Intermittent no signal on transmit #transmit


Tim Dawson
 

I think a few have reported an issue, but am not aware of (nor have I seen) any change in that area . ..

On August 17, 2022 10:14:24 AM CDT, David Ackrill <david.ackrill@...> wrote:
On Wed, Aug 17, 2022 at 05:32 AM, Michael Black wrote:


Adjust the WSJTX power slider to -3dB.
I thought that, in the latest versions, the power slider isn't connected anymore?




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Sent from my Android device with K-9 Mail. Please excuse my brevity.


David Ackrill
 

On Wed, Aug 17, 2022 at 05:32 AM, Michael Black wrote:


Adjust the WSJTX power slider to -3dB.
I thought that, in the latest versions, the power slider isn't connected anymore?


Michael Black
 

Proper ALC level depends on the rig.  Some want zero...some want a bit of ALC in order to get maximum (not full) power.
You have to know your ALC's behavior.  One way to tell is pretty easy.
Set your rig to 50W.   Adjust the WSJTX power slider to -3dB.  You SHOULD get ~25W out (-3dB will be half power).If you do not get 25W out then your power settings in your transmit audio chain are not correct.  Mind you I have seen a few rigs that do no operate in a linear manner but the vast majority do behave correctly.
Now start turning up the power slider in WSJTX to get 40W (you can just click the power slider and use the up-cursor key).
With the rig at 50W and transmitting 40W check your ALC meter.  Whatever it says at the point is what you need (Elecraft being the exception).  I've not seen a rig yet that can't do 80% power with a clean signal.  I've seen a lot of rigs where ALC starts coming in above 90% and it's best to avoid that .  Mind you it is NOT ALC which causes the problem -- it's just the canary-in-the-cave.   Mind you 90% power is 90W out of 100W which is a small enough difference of 1dB to not matter.
I have a paper on my QRZ page that goes into more detail .  Search for FT8Noise on https://www.qrz.com/db/w9mdb
Mike W9MDB

On Wednesday, August 17, 2022 at 04:58:05 AM CDT, David Ackrill <david.ackrill@...> wrote:

On Tue, Aug 16, 2022 at 01:49 AM, James Dale wrote:


When I have the ALC meter on it shows nothing.
If you are running with ALC showing then you could be over driving your audio anyway.


ve3ki
 

Occasionally (once every few dozen tries, perhaps?) after I use Halt TX to stop an unwanted transmission, the next time a message is transmitted there will be no audio; the rig is switched into TX, but no audio is sent to the radio. It has been like this for years through many versions. David's response generally fixes it immediately, or I can just wait until the next transmission, which will be OK.

73,
Rich VE3KI

On Wed, Aug 17, 2022 at 07:17 AM, David AD4TJ wrote:


 I've had this issue for a couple of years now. I think it is a known bug.
It has happened with each update of the program here. The solution? Quickly
hit Halt TX, then Enable TX. 99% of the time this restores normal operation.
YMMV.
David AD4TJ


David AD4TJ
 

I've had this issue for a couple of years now. I think it is a known bug. It has happened with each update of the program here. The solution? Quickly hit Halt TX, then Enable TX. 99% of the time this restores normal operation. YMMV.
David AD4TJ

On Wednesday, August 17, 2022 at 04:08:14 AM EDT, alex <alex@...> wrote:

Hi Bob,

nope. I occurs using WSJT-X and watching my monitor. Saving is switched of on my monitor.

73 Alex


David Ackrill
 

On Tue, Aug 16, 2022 at 01:49 AM, James Dale wrote:


When I have the ALC meter on it shows nothing.
If you are running with ALC showing then you could be over driving your audio anyway.


alex
 

Hi Bob,

nope. I occurs using WSJT-X and watching my monitor. Saving is switched of on my monitor.

73 Alex


Bob G8HGN
 

Hi,

It could be you have an HDMI monitor and this can cause this problem. There are several threads on this on the forum.

If you think this may apply to your set up, change settings to stop the monitor sleeping.

I had this some 18 months or so ago, and stopping my HDMI monitor from sleeping completely cured it. Not had one failure since.

YMMV, GL Bob G8HGN


Jerry AA2T
 

Same here about 1% of the time usually when changing ft4 to ft8 or occasionally changing bands.


alex
 

Same here. Then I have to stop TX and immediately turn it on again. It happens around 10% of the times.
V2.5.4 and V2.6.0-rc2
Windows 10

Alex PE1EVX


SA5NTK
 

I have noticed that too. It happens pretty seldom so I live with it

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73 SA5NTK/Notko


James Dale
 

I have an intermittent problem. On some transmits there is no signal. I have the audio screen on and when I does it there is no signal. When I have the ALC meter on it shows nothing.
It happens maybe every 12 times. I am clicking on the CQs.
Using V 2.5.4.
Using Windows 10
Any ideas
Jim W0PPA