Scott et. al. VAC1 + VMB + WSJT-X (FT8) has been working flawlessly on transmit (a very clean/stable panadapter display and waterfall display* on transmit... with no glitches) for 5 days But... Since my prior post on November 6, I had a problem the next day (November 7) where lot's of glitches, and ...

Scott et. al Somehow. VAC is now working with WSJT-X and VMB (i.e. very few glitches on the transmit waterfall display). Everything is configured as before. However, I did switch back and forth between MME => ASIO => MME on the VAC1 driver settings.... and briefly tried transmitting with the VAC1 dr...

Scott I meant the software. I agree that all of the software relevant to audio processing ought to be the same... and yet.... on my ANAN-10e... the thread associated with the VAC1 functionality of the overall application is behaving as if, every second or so, the smooth flow of digital audio samples...

Scott Everything (I have checked every step) is set up in accordance with your VAC tutorial. I do not have ASIO4ALL installed on my computer. I have adjusted both of the VMB Virtual I/O Control Panels for 48000 samples per second... and that is what shows up on the VMB display. All audio interface s...

Prem I have the same problem with my ANAN-10e... with VAC... using WSJT-X with VMB. I have everything set up in accordance with Scott's VAC tutorial VAC1 + VMB seems to work fine for Scott. I am beginning to believe that this may be a problem with the details of how VAC works in Hermes boards. Perha...

Here is an explanation of what I have observed... from a member of the WSJT-X design group. Stu " Hi Stu, the logical start of a transmitted codeword is a t=1s for all the slow modes except for FT8 where it is at t=0.5s. We reduced the start delay in FT8 to try and win back some thinking time a...

Update: Out of curiosity, I tried two additional experiments 1. I measured the delay between the assertion by WSJT of the T/R CAT command (i.e. using the high-to-low transition of the impedance across the ANAN-10E T/R output port to trigger the oscilloscope) and the commencement of WSJT digital audi...

Scott I am using the low latency filters: Digital Buffer size: Rx 64 Tx 128. Digital Transmit and Receive Filter size: 1024 From my last posted measurements, the microphone input => RF output latency is only 40 milliseconds. The large delay between the T/R line transition, from high to low, and the ...

Additional (perhaps more useful) data Repeating the experiments in the previous post... but using the ANAN-10 PTT output / Amplifier PTT input line as an "external trigger" for the oscilloscope... I can now view both the commencement of the audio input to the ANAN-10E front panel microphon...

Additional data: Same test as in my previous post... with the connection between WSJT and the ANAN-10E being: WSJT=> Behringer UMC204HD = ANAN-10E front panel microphone input... and with PTT being controlled by the WSJT application via a virtual VAC/serial port connection. Delay between the activat...

The above "begs the question": Are these delays entirely a translation in time of the FT8 waveform... or are the first few hundred milliseconds of the transmitted waveform being chopped off? I believe that the first few hundred milliseconds are important for decoding by the receiver at the...

Scott I made the following additional measurement: Two channel scope. Input 1 is the voltage on the PTT line between the ANAN-10E and my Elecraft KXPA100 amplifier. The scope triggers on the negative transition of this voltage waveform... i.e. when the ANAN-10E switches to transmit, and draws curren...

Scott

Okay...

Thanks for the additional comments/thoughts

As you suspected, I am also using Meinberg to synchronize my computer's clock to UTC.

I also have the WSJT transmit delay set to 0.

Nothing additional to add for now.

Stu

Scott As an experiment: Set your waterfall "high level" to +10dBm See if you observe a noticeable delay between the switch to transmit mode on the waterfall, and the appearance of the FT8 (or JT65) signal. Also, see if you notice any "glitches" on the transmitted waterfall trace....

Scott Thanks for the comments. The frequency counter is locked to the same 10MHz gps-disciplined reference as the ANAN-10E. When I use the VAC-1 + VMB approach... I can see a substantial time delay between the switch of the ANAN-10E to transmit... which starts the waterfall display of the transmitte...

Replying to my own post: It occurred to me that the UMC204HD is employing its own internal clock to withdraw samples from its buffer, and to drive its D/A converter. -0.28Hz/1700Hz => -165ppm. That sounds somewhat inaccurate for a modern crystal clock... but maybe that's what this digital audio inte...

I'm experimenting with the use of a UPhoria UMC204HD as an audio interface for FT8 (and also JT65/JT9). ANAN-10E analog audio line output (left channel) => UMC204HD left channel line input (with 20dB attenuator activated) => WSJT digital audio input (selected from the WSJT input pull-down menu). WJS...

Gordon

Also... try reinstalling the firmware. Note that the firmware sits in the control path that (for example) mutes the front panel output from the audio codec.

Stu

If you prefer to have the waterfall produce useful information when transmitting: In the settings=>display=> RX1 window... Set the "high" level of the waterfall to +20dBm. This will provide a useful waterfall on transmit... at the expense of a pretty much useless waterfall on receive. Howe...

Gary I had the exact same problem (the progress bar stalled when I opened HPSDR) with my Windows 10 -based computer every time I installed a Windows 10 update. I was using a USB hub that was several years old, and also a couple of older digital audio interfaces that did not have available Windows 10...

As a separate issue...

If you want to display a traditional AM or DSB trapezoid pattern... RF output v. audio Input... you will need to take into account the relatively large delay (latency) between the applied audio input and the modulated RF output.

Stu

I completely agree with Scott. As an additional comment: I set my TX display settings essentially as Scott does: MAX=+20dBm, MIN=-60dBm, Step= 2dB But When using WSJT (where the WSJT app provides a separately derived received waterfall display) ... I set the ANAN's RX 1 waterfall to: "High Leve...

Scott I respectfully disagree with the last sentence of your last post. If the interference component of the signal at the output of the magnetic loop is smaller than the interference component of the signal at the output of the main antenna ... one can just amplify the signal at the output of the m...

Gary Please answer these additional questions: 0. Are you using an external RF power amplifier? What RF output power level (coupled into the antenna system) are you producing when you operate? What frequency (frequencies) are you using? 1. What computer are you using (brand, model, CPU type, quantit...

Scott Here is what I obtained using LatencyMon PC= Dell: I7-4790@3.60Hz, Win10Pro, NVidia GeForce GT 720 Running: PowerSDR, ANAN-10E via point-to-point Ethernet, Voicemeeter Banana, WJST-X, Internet Explorer via WLAN, plus miscellaneous other applications. Everything working okay. Power SDR main GUI...

Tony Out of curiosity, have you tried selecting MME for the VAC 1 driver? I know that ASIO is recommended for lower latency... but, of course, latency isn't an issue with the digital modes. I don't hear any "pops" (now that I have fixed the problem that I described earlier). On transmit, e...

Tony Thanks for the suggestion. I updated all of the Ethernet adapter settings as recommended in this document: https://helpdesk.flexradio.com/hc/en-us/articles/202118518-Optimizing-Ethernet-Adapter-Settings-for-Maximum-Performance But... the VMB audio output dropout problem still remained. I change...

I am having a problem with VoiceMeeter Banana that appears to have popped up after the latest Win10 cumulative update (July 11). Every few seconds, the audio output of VMB ( which I can monitor even with the HPSDR app closed )... in response to various audio inputs that I have tried... appears to dr...

If there is a source of delay (latency) in the receive audio chain... for example, wireless Bluetooth headphones... then you will keep hearing the received audio for several hundred milliseconds after the transceiver has switched to transmit. It notice this when I use Bluetooth headphones to monitor...

As an addendum to my earlier post: I uninstalled and reinstalled Voicemeeter Banana. That fixed the problem of the missing "Voicemeeter Output" in the list of ANAN-10 VAC1 available input devices... and also in the list of Windows Sound "Playback Devices". After reinstalling VMB,...