I use it with an external hdmi monitor and have not tried it on the 7" display. Anyone who uses the sBitx 64 bit v4.2 - ELF Image published by the development team will have noticed that QSSTV is also included among the radio programs. The original application had to be modified in several aspects, and we can thank Willi W4WHL for the modifications. The sBitx controller is the RPi, which also has to handle the operation of the radio and the program that transmits the image. The QSSTV connects to the radio via an audio interface. Everything is in one place here, so this connection had to be solved in the software. After this was done, it turned out that the reception signal needed to be larger to have a visible image. For this, the incoming signal, sync, had to be amplified, which was implemented in the program with automatic gain control. The output signal during transmission was too high, so there is a slider in the qsstv Configuration/ Sound, with which the transmission level can be reduced to to the level required for transmission. Important warning: sometimes, due to bad habits, we handle the mouse and buttons incorrectly, which results in the screen freezing. In such a case, close the qsstv program and restart the application. Continue where you left off. I managed to make 8 sstv qso in a row, the program never crashed. To do this, you need to prepare the images, the Templates and do not double-click anywhere, even by accident. The program stores the received and given images and templates in a directory with the lowercase 'qsstv'. You can see the received images in the Gallery, where it is worth using the right mouse button and deleting unnecessary images containing only noise. After this introduction, the details: The program can work in SSTV and DRM modes. In SSTV mode, it has three selectable tabs, which are the Receive, Send and Image Gallery options. Now we will deal with SSTV mode. We start the program by starting sBitx and selecting the frequency (typically 14.230 kHz) and DIGI mode. The frequency display should be visible on the login screen, then there is a CAT connection, and we see something similar on the startup screen (not an error message). When starting QSSTV for the first time, we set the window size we want to see, then enter the Configuration (Option/Configuration) and fill in the data necessary for operation. The Sound and CAT data are filled in, if they are missing, you can see the necessary information in the image: Before receiving the image, it is advisable to set sBitx Volume=40, IF=50 to around and prepare by selecting agc=fast-mid-slow. In qsstv, the reception level and its range can be fine-tuned with the Max dB, Range, Avg settings shown at the bottom of the right side. You can check this in the incoming image and the waterfall window, depending on the propagation and the quality of your antenna. It also affects the image quality, so it is advisable to check Auto Slant, which is intended to correct the skew of the image. Sensitivity= DX and Mode= Auto or whatever you selected. Be patient, because as you can see, there are several options for the correct setting. After we have managed to take a picture and we think we want to send it, we must first go to the transmission window, where we can make the preparations. The selected picture is stored in the TX Stock (folder icon), for which we can create a caption with the Template editor (paint palette icon). After creating a Template, do not forget to save it (as an image, when we only want to send a picture with a permanent caption, or as a template, when it also contains macros). In the transmission window, there are some fields to fill in from the keyboard, which we will see on the transmission screen if the Template box is checked. The use of macros helps in filling in the Template, so before transmitting, you only need to fill in the station's callsign, name and report before clicking the transmit button. It does not affect reception if you fill in the transmission window while receiving the picture, as long as sufficient information is available. This way you can immediately respond to the station you see. If you want to send the received image back in the image you have compiled, you can either respond immediately after the received image has been built or you can do it by clicking on the image shown in small size in the transmission window and searching for it among the received images. Note the mode of the received image and the time of the image reception, then you will be successful, because this is how the image is stored in the folder. There are many small tricks and options that you need to try out. It all depends on how useful you find this mode to spend your time. What may be important: I made some modifications to the sBitx I am using before using it for this purpose. The output stage FETs in the device heat up during sustained PTT, and this heat must be dissipated. There is a large heat sink and it can be cooled with an external fan, and the RPi can also heat up. In my case, the output stage has been replaced with AlN (Aluminum Nitride) with better thermal conductivity instead of mica insulators, and a quiet fan cools the heat sink. Furthermore, the RPi4 4GB is installed, cooled by a quiet 50x50x10 mm fan. The pursuit of perfection has narrowed down to the best solution. QSSTV author Johan ON4QZ wrote about using the program here: https://www.qsl.net/on4qz/qsstv/manual/index.html -- Gyula HA3HZ

Does anyone have a solution for the apparent voltage drop on the DE 5-volt power rail? Is it better to move the regulator or run a larger wire? My first thought is to move the buck converter closer to the GPIO board. 73 Evan AC9TU

If anyone is interested, I'll be placing my version of "A Si5351A/MS5351 100kHz lower Limit Quadrature Clock Generator with a Retro Rotary Dial Using a 240x240 dpi 1.54 inch ST7789 TFT Display." on my github site soon. It uses a ESP32-WROVER-E . It's based on code/design by T.J. Uebo (JF3HZB) A.K.A Tj Lab(JF3HZB) https://github.com/tjlab-jf3hzb/Digital_VFO_with_analog_dial_V2.git My code has been highly modified from his and I've added a function to set the clock output drive level to 2,4.6 or 8mA to his si5351 files. The important thing is that JF3HZB was able to get the quadrature output down to 100kHz. Apparently, he was able to do this back in 2020 but I just heard about it recently. It's all explained in his si5351.cpp and si5351.h files and on his web site. I thought others might like to implement his code to use it in their own projects for the LF/HF bands. Attached are a couple of photos that show the Si5351A output down to 100kHz. -- Jerry Ponko, AC9NM

WILL SBITX BE SWITCHING TO THE NEW RASPBERRY PI TOUCHSCREEN 2?

Hello all, Trying to be able to view / operate my sBITX on my PC or tablet. On the HF Signals website it has this in the description for the sBITX: I'm still having a lot of fun with my sBITX and I'm trying to learn how to do more with it. I figured out how to watch my NCAA football team play a game on the sBITX via YouTube. Can't think of many HF radios that will allow you to watch football on. Anyway I was thinking that it would be nice to have the display on one of my PC monitors, or a tablet. Could someone please give me some instructions on how to do this? Is it the same as operating a RPI headless? -- '72 Aaron K5ATG

I own a CrowPiL laptop (https://www.elecrow.com/crowpi-l-real-raspberry-pi-laptop-for-learning-programming-and-hardware.html) running a Raspberry Pi4B-8GBit ram. This laptop runs a 12inch screen with a HDMI plug and has two bootable 32Giga SD cards allowing to boot two different OS, each in turn. I added a 64Giga SD card as dev/sda giving additional data storage. This computer has also a 40 pins socket allowing to plug an external device with a 40 wires ribbon to the Raspberry Pi 4B. There is obviously a bluetooth mouse. This laptop currently runs Rasbian, a Raspberry version of Debian. Two USB3 ports, one HDMI port, one ethernet socket and one 40 pins socket are available and it connects easily on a WiFi network. My question is: if I buy a SBitx card alone, can I plug it to this CrowPiL laptop will I have as result a working SBitx transceiver? I would of course load the SBitx firmware in one of the 32Giga SD cards and having a good practice of Debian I could easily hack the firmware to my taste. 73 - Pierre - FK8IH

Hello community, I build the uBitx v6 kit with the small screen and it worked. Now I have replaced the display (Nextion 5") and the enclosure from inkits.in. Unfortunately the calibration no longer is right. When I send CW on 3.6 Mhz the signal is real on 5.19 Mhz. The RX also doesn't work. There is only noise on all frequencies. I can't get any further with the calibration because: the tutorials that describe a direct calibration in the uBitx-Menus are not for the Nextion 5" display. The menus in the Nextion Display cannot be used. I tried it , via PC and the "uBitx Setting Editor". But here is CEC V2.0 required for the calibration wizzard. However, CEC V2.0 for uBitx and Nextion display cannot be installed, ( or I cannot find the right one ) Maybe someone has an idea how I can get the correct calibration data? I have an Screenshot from uBitx Settings Editor in the attachement. Greetings Mathis HB9GYE p.s. Is it to simple thinking, that I only need this three values: Master Calibration, SSB BFO and CW BFO ?

Hi Everyone This is my version of the sBITX. It uses a Pi Pico 2 rather than a raspberry Pi. It does not have all the software capabilities of the sBITX but it does have a spectrum display. I designed it to fit a Hammond enclosure of size 160mm x 125mm. I've followed the hardware of the sBITX with a few modifications. The SWR circuit uses a pair of MCP302 I2C ADCs Decided on relays for band switching because to me it's simpler and proven Uses a reed relay for the receiver isolation (I like it because it's silent and operates in less than 2 milliseconds) I've added a high-pass section to the 11 pole low-pass filter to keep out strong local AM signals I found that the 40MHz crystal filter had an impedance of 50 Ohms when the band-pass was about 15Khz - so went with that - no matching circuit needed I went with an MMG3H21 MMIC for the receiver RF amp (and TX pre-amp). I've used it before and it works great Used a T-622-KK81 trifilar transformer in the first mixer in conjunction with an 74LVC1G3157 analog mux which means that the Si5351 can drive the mixer directly The second mixer is a sampling detector using a 74CBT3257 which is also used for TX The receive (and mic) signal is sampled using the Pico ADC which is 12 bits but 16x oversampling brings that up to 14 bits. It seems to work pretty well. Audio and TX signals use PWM with a range of 12 and 10 bits respectively. I was surprised at how good the audio sounds with just 12 bits. Nothing special about the power amp. It's a push-pull configuration using a pair of RD16HHF1 mosfets On the software side. I went with FIR filters and digital mixing. The spectrum is processed separately from the audio signal processing. I'm no expert and I found this way easier to implement! Details are here: https://github.com/ianm8/uSBITX I'm still working on the software which I find quite difficult and time consuming! Cheers, Ian VK7IAN

Hi to all, Im very interested on to sbitx hat. If anyone have one and is interested to sell, please let me know. Thanks! Juan WP3DN