I don’t think that it is always a USB problem.
I have been aware of very brief “holes” in the audio output for many years/versions. In fact, more often than not I see a brief dropout – shown by the RF output power dropping (with ALC glitch) and drop out of audio on monitor. But my audio in/out is not via USB, but through the mic/phones connections on the computer. I’ve always assumed that it’s due to a problem with audio “streaming” in the computer/soundcard – and ignored it! David, G4YTL From: Nic Sears via wsjt-devel [mailto:wsjt-devel@lists.sourceforge.net] Sent: 30 January 2024 14:11 To: WSJT software development Cc: Nic Sears Subject: Re: [wsjt-devel] Wsjt 2.7.0 rc3 apparent holes in transmission Thanks Neil, suspected that but audio stream on other output seemed ok. Cannot check usb stream, will try and find an update. Amazed an eme QSO works ok with holes!! Nic On 30 Jan 2024 13:03, Neil via wsjt-devel <wsjt-devel@lists.sourceforge.net> wrote: Hi Nic, I had this problem with random gaps of about 2 seconds in transmission audio with an earlier release. It was nothing to do with wsjt-x, the root problem was a buggy USB 3.0 driver for the internal card in the machine (i7/32GB/Win10). I updated the driver and that fixed it. It took a long time to diagnose! -- Neil G4DBN https://youtube.com/MachiningandMicrowaves On 30/01/2024 12:20, Nic Sears via wsjt-devel wrote: Hi there, Nic G3YEG here. I have been using wsjt for quite a few years both ft8 (hf, vhf and uhf) and q65-60b on 432 eme and have never consciously notice the power output of any of my previous rigs varying during ft8 or q65 tx cycles. Recently I Started using a new laptop with much higher spec than old machine and also changed over to rc3. I then noted that the alc on my ic9700 had started spiking on the tx cycle. This seems to be completely random and does not appear to effect the decoding of my signal at all, hf, vhf ,uhf ft8 and even with my very low power q65 eme set up having had 3 recent eme qso’s and seen the spikes occur on tx. It also occurs on the ts2000 i use for hf. I have investigated and it seems that the transmission does have “holes” in it when you actually listen to it. It is not consistent as sometimes the tx cycle is completely clean and sometimes has a number of holes. I have reverted back to 2.6.1 and that also exhibits the same problem but it does seem to be to a lesser extent. However Not done that many tests on 2.6.1 I always run with nil or very low alc on both my rigs so the recent spiking has been quite obvious. The tx power output on both the rigs doesn’t seem to dip that but the 9700 current drain certainly drops on the rig metering. The old machine was a Lenovo running Windows 10 with an amd a10 and 12gb memory driving the 9700 via a single usb interface. The new machine is an intel i7 running Windows 11 with 32Gb memory again driving the 9700 via a single usb interface. The ts2000 is driven from the new machine via a usb to rs232 dongle for cat control and a usb to analogue dongle for the audio interface. The icom Ic-9700 usb driver was in use on both old and new machines. I mentioned this observation to another local eme operator who has also noted these “holes” but also observed that it doesn’t seem to cause any remote station decoding problems. Be grateful if you could consider my observation and advise if there is a real problem. Thank you, Nic
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