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,...

Brent My Win 10 -based setup has always been finicky on Windows updates* After installing the "Creators" update... yesterday... I had the problem you describe (VAC1 not providing audio input to the ANAN-10E on transmit). I noticed that in the HPSDR audio settings... the VAC1 settings had c...

Scott Couldn't Buck use the microphone level input (left) side of the Focusrite Solo just as a combination phantom supply and preamplifier for the Behringer condenser microphone... and then connect the unbalanced (RCA jack) analog output on the back of the Focusrite Solo directly to the analog front...

Doug

Your tireless efforts and dedication are very much appreciated.

Stu

If an oscilloscope is not available, one can do the following: Adjust the drive so that, in "tune", the transmitter produces 25W (not 100W) of output. Turn the transmitter off. Remove the Pure Signal coaxial jumper. Connect the Pure Signal output port of the internal coupler directly to th...

Based on Chris's observation that: using the internal coupler, and with 100W output, Pure Signal sets the step attenuator to 17dB...... The transceiver is set to 100W output = +50dBm The input power to the A/D converter (that is set by Pure Signal... using the "auto attenuate" algorithm in...

Chris Attached, is the URL of the KC9XG-SDR Yahoo Groups web site (files section), that contains (February 26 listings) block diagrams of the 8000. Note that, if the coupling loss of the internal coupler were 14dB too low (compared to what was desired to prevent overload of the step attenuator... e....

Chris Without knowing the coupling loss of the internal coupler (I.e. how much loss there is between the 100W output of the 8000 and the Pure Signal feedback output port of the internal coupler)... all you are observing is that the coupling loss of the internal coupler is 12dB less than the coupling...

I have an inexpensive 7.040 MHz S9 (-73dBm) signal reference that I purchased from Elecraft a few years ago. They sell an upgraded (but more expensive) version now... that has three frequency selections. It would be very easy to make one of these (see the XG-1 schematic in the XG-1 manual on the Ele...

If the preamplifier gain is 14dB instead of 20dB* and the volunteers who develop the software don't know that... then the S-meter readings and the panadapter readings will also be 6dB low. *This sounds like only one side (+ ground) of the balanced input to the preamplifier is being used. The extra ~...

Chris Scott The LTC6400 low noise preamplifier... that is included in the front end amplification chain of each receiver... has an "enable" pin. Could it be that, in the 8000 transceiver, this 20dB gain block is being disabled on transmit (to protect the A/D converter)? That would explain ...