On Fri, Nov 6, 2020 at 08:53 PM, Dragan Milivojevic wrote:

even better when modded and overclocked

What do you gain by overclocking it?

Thanks, ? ? ? ?larry

On Fri, Nov 6, 2020 at 04:29 PM, DuWayne Schmidlkofer wrote:

Just saw this on YouTube, a smple Arduino based component tester.?

I was late to the party, also. Discovered these about a year ago.

I have two that seem to work well. The first one is a circuit board with a thin glass monochrome LCD green backlit graphic display. Powered by a 9V battery.

The second one I bought is in a tan colored box with a color TFT LCD display. This one has a rechargeable battery and a voltage boost that lets you test the breakdown voltage of Zener diode. Also can decode the IR pulses from remote controls.

I think I paid less than $10 for the first and around $18 for the second. The second one was on sale on Banggood. The first one was likely bought on eBay. Was a while back so prices may have changed.

It is truly amazing these things work as well as they do, by just wiggling the current through two different resistor values on each of three pins. And the software is clever enough to do this with the components in any configuration connected to the three pins.

Tom, wb6b

Just saw this on YouTube, a smple Arduino based component tester.?
?
There is a link to a website with schematic, BOM and Code.
Code is probably the basis for some of the ones available on ebay for around $15.
But, if you have the parts around it would be an interesting project .
--
DuWayne,? KV4QB

/g/HBTE/files/WA2FZW%20-%20M0WID%20ESP32%20-%20ILI9341%20Version%20of%20the%20TinySA/simpleSA%20%20%20%20%20PCB%27s

vk3pe

I have uploaded the latest version of the firmware for the ESP32, you can find it here:?files/WA2FZW -M0WID ESP32 - ILI9341 Version of the TinySA/simpleSA_0_11.zip

We renamed this ESP32 version simpleSA to avoid confusion with Erik's tinySA.

Development of this version continues, but on a hobby basis so when time permits.? It does not have all the bells and whistles of the commercial tinySA, but does have some different features, the main one being that the wifi facility of the ESP32 is used to serve web pages allowing the simpleSA to be controlled and the chart to be viewed on any modern browser (not Internet Explorer!), tablet or smartphone.? The other main feature is that if two of the VK3PE RF boards are used then the second one can be used as a tracking generator or signal generator.

Next version should include support for an optional rotary encoder to navigate the menus and add some additional marker features.

Please report any bugs or suggestions.

73

Dave M0WID

The following files have been uploaded to the Files area of the [email protected] group.

• /WA2FZW - M0WID ESP32 - ILI9341 Version of the TinySA/simpleSA_0_11.zip

By: m0wid

Description:
Latest (as of Oct 2020) firmware for ESP32 version of the spectrum analyser, now renamed simpleSA to avoid confusion with Erik's tinySA. Includes support for tracking generator using one or two additional SI4432 (two is best), self calibration of levels, IF sweep mode to test the SAW filter performance, RX sweep mode to test the bandpass filters, a rudimentary Bandscope mode, web page updated for the signal generator mode, tracking generator can also be used as a fixed frequency signal generator, trend storage added to the web pages, right hand chart axes hidden on the web page chart if the relevant traces are not enabled.

Thank you!

I had TFT_eSPI, WebSocketsServer and ESPAsyncWebServer installed.?
But not those others. Now it compiles :)

"Sketch uses 500717 bytes (38%) of program storage space. Maximum is 1310720 bytes.

Hello Ismo,

you need to install these libraries into your Arduino IDE:

- TFT_eSPI → Library Manager

- AsyncTCP.h →

- ESPAsyncWebServer.h →

- ArduinoJSON.h → Library Manager

- WebSocketsServer.h →

?

For the ones labelled "Library Manager" the IDE will find those itself, when you search for it using "Tools / Managa Libraries".
For the other ones you have to download a ZIP file and add that to the IDE using "Sketch/Include Library / Add .ZIP Library".
--
Joerg, ex-DB2OO

Hello!

I have trouble compiling this one.

I get a complaint about the wifi library used, which one should it be?

Thanks a lot Dave and Erik for your hints.Very helpful!

I'll measure the bandwith of my BPF. Lets see if I can lower the noise floor by optimicing the BPF or changing the IF frequency

One reason is the?AGC acts by reducing the LNA as long as there is signal through the BPF. YOur BPF seems to be 1.4MHz wide (see steep step at 0.7MHz
Second is the phase noise from the SI4432 that spreads the zero Hz peak over a rather wide bandwidth (noise floor slow reduction above 0.7MHz)

--
HBTE Files section:?/g/HBTE/files
Erik, PD0EK

Hi Piotr

In my homebrew analyser based on an ESP32 processor I see a similar effect.? It is because at low frequencies there is very little difference between the LO frequency and the RX frequency, so some of the energy from the LO leaks through the mixer and gets through the filters to the receiver.? There will very likely also be other leakage paths, e.g. down the SPI lines.

To get the best result at low frequencies I set the IF to as high in the SAW filter passband as I can go without dropping off the flat part - in my case around 434.2MHz (default is 433.92).? The construction of the SAW filter is also important - read the datasheet and make sure you build it with the same footprint as shown there.? I built my first version OK, but messed up the second version as I didn't notice the PCB design software had connected the upper pads to the upper groundplane when it did the copper flood.? That and good vias to the lower groundplane really make a difference to the filter performance.

It will never be perfect at low frequencies however you should be able to do better.? Attached is a screen shot from my tablet with similar settings to yours, spur reduction on, nothing connected.? Without spur reduction I have a nasty at around 1MHz, -80dBm.



In one of the other posts (/g/HBTE/message/1519) Glenn VK3PE shows the result of a test of the SAW filters using his build, also based on ESP32 processor, using PCB he designed.

Dave M0WID

Hello,

when sweeping from 0 - 10MHz (without an input signal) I always get a higher noise floor starting @ 0Hz - 2MHz.

Does anyone has an idea what could be the reason and can this eventually be impoved to get the same noise level as for higher freqeunzies?? Disconnection the mixer/ BPF from RX SI4432 dielivers the same picture.


Thanks
Peter

ps. I'm using for TinySA Arudino Zero from Protoneer as recommended by Erik.

On Fri, Sep 18, 2020 at 08:25 PM, Alan wrote:

The heat emission from a CPU is in the middle of the package, the cooler provides best results where the CPU package normally contacts the cooler. A CPU cooler is very much more effective ( and cheaper) than a massive Aluminium heatsink as long as the fan is turning!

Yes the larger CPU heat sink I used was around ?9 off ebay, it's very effective, the heat difference throughout the heat sink is minimal really. Don't need a fan on it unless I run 70+ watts continuous into it, which is rare really as it's only for testing every now and then.

开云体育

I'm not sure about the physics but amplifiers often use copper "heat spreaders" between the active devices and the aluminmum heat sink.