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Jerry, Only having a 120kHz resolution filter will make certain SA applications impossible. Next of being able to resolve two closely spaced signals a 3kHz resolution filter also gives substantial

There are other LO's which can move much faster than the Si4432. Would be tough to find something at that price. No idea how many ADC samples from the AD8310 we need for good results. But given my

SA.exe scans all COM ports and tries to open each port and if open succeeds it gives the "v0" command and check if the response starts with "VFO". Only then will the COM port be shown. You can use the

I could not resist to make the tinySA with its tiny display operational. All local control goes through one rotary encoder with push button. Local settable are from (MHz), to (MHz), max display (dB),

Hello Erik, I tried to connect with the SA.EXE program from the FILES section to an Arduino running your HyperVFO software, which I pulled from a different place. Unfortunately the SA.EXE does not

Scanning 150MHz with 120kHz bandwidth requires 1200 measurements. Each measurement needs a new frequency of the LO SI4432 PLL. This could take up to 1 ms to set and settle. Then you have to average

Could be that delay through the SAW filter limits our scan rate. Must wait that delay time after a change to the LO before sampling the 415mhz RF. But I'm betting we are typically limited by how fast

Will not help when the saw filter bandwidth is the limiting factor. For a wide scan you can opt to remove the saw filter as the mirrors will not be visible -- HBTE Files section:

So, maybe your tinySA plus an AD8310/AD8307 to improve response time for wide sweeps if the SAW filter is too narrow.

Disadvantage of the ad8310 is the lack of selectable band filter. The SI4432 offers between?1kHz till 600kHz selectable? selectivity. The saw filter is only used to suppress mirrors and should be

Eric, Thanks for all the answers. I'm no expert on SAW filters, or anything RF for that matter. But have read that impedances on a SAW filter can be modeled as a capacitor from input to output, with a

Hi, Will there be any chance of a Linux version of SA.exe ? It will probably run with Mono/Wine(not tested yet), but I always like to have something native.... Since it is written in C++ (I believe),

Document is updated to PDF -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Hello, This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group. * /Tiny Spectrum Analyzer/Build instructions for

In real life you never want to exceed -10dBm at input as the RX SI4432 will be overdriven and the mirror suppression starts to fail. Will add to the " how to build" document -- HBTE Files section:

Indeed, in SA.exe They c

Afraid not as the RF and LO range is way to high. At lower frequencies this mixer will be completely deaf. It is a very nice microwave mixer though Frequency range, RF&LO 9.0-15.0 GHz Frequency range,

HMC412 is specified for 9 to 15GHz with +9 to +13dBm LO drive. So I'd say no. The IF does go from DC to 2.5GHz, which would make it an interesting 1st mixer candidate for a spectrum analyzer with the

Came across this one : https://www.banggood.com/HMC412-9-15G-Low-Noise-Double-Balanced-Mixer-Up-and-Down-RF-Frequency-Conversion-Passive-Mixer-Module-p-1500021.html?rmmds=search&cur_warehouse=CN Would

Eric, Might I suggest using a 2.8inch TFT SPI display like those used on the NanoVNA and uBITX V6. they are fairly inexpensive. As far as the microcontroller, maybe a STM32, esp32, or a pi-zero. If