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Hi Jim, et. al., I am working on the software for my Electronics II class project for next quarter. In the past, my students designed QSD based software defined receivers that we used to connect to Quisk via soundcard. The problem is lately laptops do not come with stereo sound inputs and so a USB soundcard is needed. Those are always a pain to purchase, because what was available last year is not this, or they have changed the specs to be mono input, or something so they don't work as well as the old ones we used to be able to get. Every time you buy a USB soundcard, you take a risk. I have lost that bet in the past. This year I want to have the students grab the analog signals from for I and Q with their own ADC and send them to the host using the USB UART. I will still have them add a 3.5 mm jack, but hopefully only for debugging. We will be having JLCPCB build their boards and JLCPCB has a couple interesting audio ADCs that are a lot less expensive than a sound card. The 24-bit one I'm using (PCM1808) is only fifty cents and the specs are better than the cheap soundcards I used before. It will be nice to get rid of the 3.5 mm audio cable between the laptop and the SDR. In the future, I might want to use an MCU with WIFI like the Raspberry Pi Pico W and send the same data over UDP so the SDR could be more remote to the host PC. I think using the USB UART is a good first step in that direction, so at this point I am first pursuing that first. I have done tests and can get 5.9 Mbps pretty easily over the USB ACM-CDC UART of the Raspberry Pi Pico to a Linux host. I want a 48 kHz sample rate and for this the bandwidth I need 3. Mbps to send 64 bits for each IQ pair (only 48 are needed, but we can use the extra 16 bits for each pair to send acknowledgements of commands or synchronizing data ). I might even be able to get a 96 kHz sample rate in the 5.9 Mbps available. The thing I would very much like to know is where in Quisk I should inject this I/Q sound data that is not coming from a soundcard. I have the hardware.py file figured out for controlling the SDR, but I'm looking for how the I/Q data connects to Quisk. It almost looked like Hermes Lite data went directly into quisk.c, but I'm hoping there is something easier to interface to, than the main c program, which is daunting just to read. ? I have one other puzzling issue. The actual sample rate (due to the Raspberry Pi Pico limitations) is 48.0460 kHz, so I will need to discard samples or something to get the data rate to match the more accurate soundcard sample rate. How close do I need to get it for Quisk to work properly? You have a lot more experience with sample rate matching than I do, so any tips you have there would be appreciated. I have some theoretical ideas that first reconstruct the analog signals from the sampled ones, then resample them at the correct rate, but I suspect that is not the best option and suspect just randomly discarding samples at the right rate might be better. The first sentence of the Quisk Docs says, "This is Quisk, a Software Defined Radio (SDR). You supply an antenna and a complex (I/Q) mixer to convert the radio spectrum to a low IF. Then send that IF to your computer using the sound card, Ethernet or USB." That is exactly what I want my students to do, and I need to minimize the software they have to worry about, because their learning objectives are more hardware oriented, though these days, you cannot skip the software altogether. ? TNX & 73, Rob -- KL7NA

If you switch from -1 to any value (or from value to -1), then it's fine. But if you switch between different values, then there is a problem. For example, between 1366 and 1920 (forward and backward). The previous value is applied. If the operation is repeated, the new value is applied. You have to apply it twice (button "On").

Installed Quisk with the Dec 2023 imstructions. Works fine on receive on am, cw and ssb. In transmit mode it puts out a carrier on am in the right place and cw works fine. I'm using the Startech 7.1 usb soundcard.Which Quisk sees as "CM106 like device". In Configure and Sound for the softrock 6.1 I'm using the following:- Radio sound: Built in audio analog stereo (hw: 1,0) IQRX: Pulse CM106 like analog stereo (hw,1,0) IQTX: same as above: What is the best config for the microphone? If i use the same for the microphone I do get audio out but I have to switch the Laptop audio fron line in to microphone (CM106 like) on transmit and then back tp line in (CM106 like)for receive.

New to forum - Attempting to build windows 10 version and get error message in build process. Tried to add photos of screen shots but could not do it. I think I am a new member and need approval of the group moderator. Thanks.