On Mon, Feb 24, 2020 at 08:21 AM, Sverre Holm wrote:

I wonder how it compares to similar frequency standard projects by W2PM and F2DC

I'll have to look at those when I get a chance, but using mine as a 10MHz (or any other frequency)?standard, if the frequency moves?by 1Hz, it recalibrates?itself so I guess it's good for 1 in 10 million.
?
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John P.
WA2FZW

I don't have anymore of the latest version of the PCB that has the preamp
on the board, but I still have a bunch of the older PCBs without the
preamp.

Again, these will work fine on 3V3 or TTL level signals as-is. It would
also be very easy to build the preamp (a 2N2222 and a couple of resistors and
diodes) on a piece of perf board.

You can have these for $3 each with free domestic shipping.

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John P.
WA2FZW

Interesting project. I wonder how it compares to similar frequency standard projects by W2PM and F2DC,?

They both use a 40 sec calibration interval, claiming a?system uncertainty?to be?better than 1 part in 10 million.?

Sverre
LA3ZA

Hello,

This email message is a notification to let you know that the following files have been uploaded to the Files area of the [email protected] group.

• /Tiny Spectrum Analyzer/ESP32/tinySA_touch02.zip

Uploaded By: m0wid <david.wilde@...>

Description:
A few small changes and fixes. Added a menu item (under config) to set agc or fixed preamp gain. Removed DFU mode if ESP32. Time between setting frequency and taking a reading varies with RBW.

Cheers,
The 开云体育 Team

Sorry, forgot to post the pin outs used:

ILI9341: (uses the ESP32 HSPI bus)

SI4432:? (Uses the ESP32 VSPI bus)
CS(nSEL) for the RX SI4432 is pin 4, CS for the LO SI4432 is pin 5.

The rotary encoder and the latest touch UI are not working together. The rotary menus only work with the very small display
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK

On Sat, Feb 22, 2020 at 06:29 PM, m0wid wrote:

I have added an ESP32 subfolder to the Files section (in Tiny Spectrum Analyser folder), and uploaded a ZIP file tinySA_touch01.zip there.

Dave, please email me (good on QRZ). I have a question about the TFT_eSPI library setup that is probably not of interest to the group (at least for now)!

Thanks!
?
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John P.
WA2FZW

I have added an ESP32 subfolder to the Files section (in Tiny Spectrum Analyser folder), and uploaded a ZIP file tinySA_touch01.zip there.

Still some refining work to do, for example not tested with a rotary encoder yet, or the tinySA.exe but works great standalone with touch (use a stylus or pencil).

Great work by Erik adding the touch menus from the NanoVNA.

A photo showing the 15Mhz -30dBm calibration trace:


Time for bed
73

Dave M0WID

Erik,

...And here's the construction of it...It's not pretty, but GOD does it work..!

Marty (KN0CK)

Erik,

Thanks much for the further guidance - - Once I rebuilt by filter and tested it, here's my results as attached. Looks GREAT..! BTW - My BPF assembly does not use any capacitors or coils - I built mine with Qualcomm 360kHz BPFs, two micro-coax-SMA cable assemblies and I took a chunk of the micro-coax and connected it between both filters and it just gave me the most wonderful results - the pictures really show it.

73 de Marty, KN0CK

There are only two settings different from normal setup and nothing you need to change in hw setup or connections.
Go to the settings tab.
First set the combobox after Sweep from regular to "first IF"
Second set the first IF frequency 10MHz lower to allow scanning of the whole BPF
Scan between 0 and 20MHz to have the BPF in the middle of the scan

That is all!
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK

Erik,

MANY THANKS for the .cfg file - that really helps us all..! Is there a certain configuration that the TinySA needs to be in for this measurement? I'm thinking of the IF input on the mixer being (I think) un-terminated and may have influence on the measurement? Do we need to configure the TinySA into a different RF configuration to make this measurement? Please let us know so we're following your work appropriately. If there's no changes needed from the configuration we all use to make spectrum measurements now then please let us know that, too.

Again, many thanks for your efforts on this Erik -you cannot know the avalanche of people following this project and other Hams that want to get in and try this, too...it's remarkable...

73 de Marty KN0CK

This project is a GPS locked combination frequency counter/frequency standard.

It's designed to work with the . It runs on an Arduino
Nano and uses a 4x20 LCD display. An Si5351 module is used as the frequency
standard.

. Included is the software for
the "GPS_Counter" program, a document that describes how to build and operate
it and the Gerber files for the printed circuit board.

A second program, "Where_MI" can be run on the same hardware and provides
traditional GPS functionality.

If anyone is interested, I have about a dozen of the PCBs that I am willing
to part with for $5 each with free domestic shipping and about a dozen
earlier PCBs that do not have the preamplifier stage; these work fine for
3V3 or TTL signals. You can have those for $3 each with free domestic shipping.

Email me (good on QRZ.com) if you want a PCB.

Enjoy!

--
John P.
WA2FZW

Measuring SSB modulation poses some problems for the tinySA. First the modulation bandwidth is typically 2.7kHz which is very close to the minimum BW of the tinySA. Next the phase noise of the SI4432 will have a significant impact measuring with such low BW.
So I decided to give it a try.
The test setup is HDSDR for the I/Q encoding and a Softrock ensemble II RXTX as transmitter.?
At first I set the LO and the TX frequencies both to 7.1MHz to simulate what you will get when you use traditional transmitter using a side band suppression filter.
The test tone used was 2.5kHz to have almost the maximum distance between the LSB and USB signals. Setting the I/Q balance way of just shows the unwanted upper sideband as a right shoulder about 15dB below the main signal.



Tuning the I/Q balance in the HDSDR calibration panel is easy and quickly the shoulder representing the upper side band disappears in the noise



With only 30dB measurement range available due to the phase noise floor it is impossible to see of the I/Q balance side band suppression can be tuned to 40dB or better.

In HDSDR you are free to choose the TX frequency versus the LO frequency as long as the delta between TX and LO is within the bandwidth of the audio channel.
So I set the TX 10kHz lower to avoid the phase noise.

Without tuning you get this (different vertical scale!)



and after some tuning the left peak disappears in the noise and it must be at least 40dB below the wanted sideband.



In conclusion the tinySA is just capable to visualize this SSB modulation and can support tuning.

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

, Glenn (VK3PE) suggested
a better approach to creating the original mechanical drawing by using
the same program I use to design circuit boards. I gave it a try and
it's actually a much better approach than doing the drawing by hand for
a number of reasons.

Thus I updated the document to include that procedure.

Enjoy!

--
John P.
WA2FZW

Here it is.
Use file/load setting and load firstIF.cfg
On the measurement tab set center at 10MHz and a span of 20MHz.
Everything else on off or automatic.
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK

Marty
Can you do the measurement of the BPF as with 1.6MHz passband you should be able to have good measurement.
Or are they in reality much wider?
Further the RBW of he tinySA should be about 10kHz in your measurement but it looks much wider?
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK

I etch it into the board itself.? Or, I toner transfer it on, then clear coat it.
73
Gary
WB6OGD

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