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Does anyone want a copy of the January/February 2025 issue of QEX? The ARRL sent me two copies. It has the tinySA tracking generator design article in it. Of so *respond to me privately* at kc0wjn at gmail dot com Responses to the list will be ignored. The magazine is free; shipping cost from 32754 USA to be paid to me by PayPal F&F (the shipping cost using USPS Media Mail is probably trivial). DaveD KC0WJN

Hi, I'm writing a C# program to receive data from TinySA and analyze it. I need to retrieve data from these three commands every second: frequencies data 1 data 2 The issue is that, from time to time, TinySA does not return data over USB. After this happens, it stops responding to any commands I send over USB. I suspect this might be because I need to set the correct parameters during the connection process with TinySA over USB. Unfortunately, I couldn’t find the required parameters in the documentation to properly connect to TinySA using USB. Could you please let me know the correct way to establish a USB connection with TinySA? I've tried several methods, and the following setup has been the most stable so far: PortName = "COM3"; BaudRate = 115200; new SerialPortStream(portName, baudRate) { Parity = Parity.None, StopBits = StopBits.One, DataBits = 8, WriteTimeout = 500, ReadTimeout = 5000, Handshake = Handshake.DtrRts }; await serialPortStream.WriteAsync(commandBytes, 0, commandBytes.Length); Thanks in advance!

Whilst using the TinySA Ultra to take signal measurements yesterday, the device became unresponsive. I have power cycled the device and we have updated the firmware, with no improvement. The device starts and launches the FFT screen with the attenuation and frequency marker which can be moved with the toggle. However, the amplitude is not shown on the grid. If the toggle is pressed, the menu opens and the device becomes unresponsive. If the screen is touched, the device becomes unresponsive. Has anyone had any experience with this?

Hello. I bought my tinySA ULTRA in 2023 to do self-certifications of developed hardware and/or to find out if my hardware will meet requirements for approval. Though, I did not have any success yet. The ULTRA is calibrated and tested, but I have no idea on how to use it for this purpose in best way. Is a video tutorial available, showing the usual way/process of doing that? I am working to 100% on Linux (have a Linux workstation running openSUSE 15.5 x64). It would be great if a program is available, generating a report with needed details by controlling the tinySA ULTRA over USB and finally generating a printable report for archiving. It would be great if somebody can help. Thanks in advance!

All, The extra copy of QEX has been spoken for. DaveD KC0WJN

I apologize in advance if this is a dumb question but I need guidance. I have a Tinysa spectrum analyzer but I am completely new to radio frequencies and the spectrum world but NEED to learn as soon as possible. All the book search results I have found so far seem advanced because I am not even familiar with the terminology. Can anyone tell me where to start? I am not a techie. Any beginner’s resource for dummies will help. Also, are there people/consultants out there who you can pay to advise you on how to set your spectrum analyzer based on what you are trying to capture and who will interpret the results for you? If so, what are they called (so I can search the web), and/or where can I find a reputableone? Thank you very much.

Hi Erik, Back in 2023 I reported that the Interval trigger feature you implemented for me on the TinySA was not working properly on the TinySA Ultra. Today I upgraded the firmware on my TinySA Ultra to tinySA4_v1.4-196-g1e9c187.bin and I tested the Interval trigger feature again and it's still not working properly. My test is to feed in a 60 or 120 Hz square wave (which is rich in harmonics) into the TinySA Ultra, set the TinySA Ultra to Zero Span mode with a frequency of 1.8 MHz, set the display sweep time to 20 msec, select interval trigger with a time of 16.66 msec and I should see spikes that are stationary (very little movement left or right) but I do not get stationary spikes on the TinySA Ultra whereas I do on the TinySA when doing this same test. Sure would be nice to get this feature working properly on the TinySA Ultra as the TinySA Ultra has the built in LNA as well as expanded frequency coverage. I'm sure your buried with the new TinySA Ultra Plus (congrats) but please put this on your to do list if possible. Thanks, Don (wd8dsb)

My Android smart phone has that feature. You can zoom/enlarge the screen image by spreading two fingers on the screen. Is this possible with TinySA in the future?

Indeed, in the CONFIG/EXPERT CONFIG/FREQ CORR menu you can make a correction of the output frequency when Tinysa Ultra is configured in generator mode. The value to be entered must be negative if you want to increase the frequency and positive if you want to decrease the frequency. But the value to be entered does not correspond to the difference of the frequency entered in the Tinysa with respect to that of the precision frequency meter, at least that is what I have found. You have to try the correction value to reach a compromise point. Nor is this value the same for frequencies of, for example, 100-500-800 MHz or 1-2-3 GHz. In addition, you always have to wait a while until the RF output stabilizes. I don't know if it is due to the precision of the internal TCXO or some other factor. I mention this data in case it can be used for some kind of improvement in a large project like TinySa ultra, which is already being asked for too much in terms of its cost, and which cannot be compared with much more expensive and sophisticated laboratory equipment. Thank you and best regards. Efectivamente en el menú CONFIG/EXPERT CONFIG/FREQ CORR se puede hacer una corrección de la frecuencia de salida cuando Tinysa Ultra se configura en modo generador. El valor que hay que introducir debe ser negativo si se quiere subir de frecuencia y positivo si se quiere bajar de frecuencia. Pero el valor que hay que introducir no corresponde con la diferencia de la frecuencia introducida en el Tinysa respecto a la del Frecuencímetro de precisión, al menos eso es lo que yo he comprobado. Hay que ir tanteando el valor de corrección para llegar a un punto de compromiso. Tampoco ese valor es igual para frecuencias de por ejemplo 100-500-800 MHz o 1-2-3 GHz Además siempre hay que esperar un tiempo hasta que la salida de RF se estabiliza. No sé si será debido a la precisión del TCXO interno o a algún otro factor. Estos datos los comento por si sirven para algún tipo de mejora en un gran proyecto como TinySa ultra al que ya se le está pidiendo demasiado en función del coste que tiene, y que no se puede comparar con instrumental mucho más caro y sofisticado de laboratorio. Gracias y un saludo

Hello. First of all, congratulations on a great job with the Tinysa ultra. I have the ZS405 version with firmware 1.4-192 and I would like to discuss a topic with you. The frequency accuracy in RF generator mode. I have checked the output at different frequencies and there are errors which are the following: 1MHz +6.5Hz; 10MHz +3.8Hz; 50MHz -8Hz; 100MHz -23Hz; 200MHz -51.4Hz; 300MHz -81Hz; 500MHz -142Hz; 800MHz -242Hz; 1GHz -350Hz; 2GHz -611Hz; 3GHz -900Hz I cannot check beyond 3GHz because the Tinysa ultra does not have enough dBm output for my GPS-referenced frequency counter and the preamplifier I have only reaches up to 3GHz.

I'm working on resurrecting a Wiltron 6600 series sweeper (10 MHz - 18 GHz) with multiple problems (I think it was a combination of salvage parts). My old systron donner 762-2A spectrum analzyer (and a 436/8484 power meter) have been helping, but it occurred to me that the TinySA Ultra might help (as in detecting presence of a signal) as well, and perhaps aid in validating the sweeper's output (through appropriate attenuators; the YIGs can kick out +15..+20 dBm.) I'm curious as to how the original ("405"?) version Ultra can be expected to behave when encountering a (single) signal (a sort-of stable carrier from a fundamental-mode YIG oscillator) far above the ~5 GHz Ultra-mode ceiling? I suspect this has been covered (either by developer, by experimenter, or both) but my searches in the group archives didn't yield anything that might apply. Thanks!

Hey folks, I've bought a TinySA a while ago for some other project, but something has cropped up that makes me wonder if it can help here. I'm not an RF professional, I know enough to know I don't know anything. A good friend is going through a breakup, and there's credible evedince their evicted ex has been spying on them. We did find a hidden smartphone running a baby monitor app already. Wifi/Network are changed, so any devices relying on that (e.g. ESP32-equipped power bars) are eliminated. However we have reason to suspect there's a cellphone hidden in or the vicinity of the bedroom. My current approach is to inspect the power outlets one by one to see if a power supply has been connected and the setup stowed away behind some paneling. I wonder if there's a way to use the TinySA to home in on such a device as well. I've done some limited resarch into it, and found e.g. videos of people using a HackRF to decode some cellular traffic between the base station and their smartphone. These were quite sophisticated, seemed to rely both on a lot of protocol knowledge (I don't have) and even prior information from the smartphone itself about used channels/modulations, that for obvious reasons also are unknown. I don't even know which kind of technology is being used. 3G, 4G are most likely, but these to my knowledge are umbrella-terms that cover a broad range of frequencies and modulations and other protocol details. So I'm just overwhelmed where to start. If somebody has some idea if the TinySA can be used to at least detect the presence if not precise location of a cell phone so we can be sure that we have to rip half the room apart, that would be splendid. I know it's a moonshot and if it is just not working that way, then I'll accept that as well. Thanks for your consideration, and I'll be back in the future with my actual purpose I bought the little bugger for. Cheers, Diez