What kind of behavior would you like after setting "measure off" #poll-notice

What is the behavior you would like to see when setting measurement to "off"

Thank you for voting.

Results

#feature_request remove markers after switching MEASURE OFF #feature_request

Hi Erik and everyone.

Probably it's good idea to remove all markers leaving only the first one on clicking MEASURE->OFF.

What do you think?

Regards,?
Andrey

Re: TinySA Not Showing In DfuSe Demo On Windows 10

#2337

Only the v1.1-31 part is relevant, the letters after that are removed
--

------------------------------------------

For more info on the tinySA go to https://tinysa.org/wiki/

Re: TinySA Not Showing In DfuSe Demo On Windows 10

#2336

Not sure - this is my first time upgrading the firmware.? These are the versions (filename - displayed version): tinySA_v1.1-32-g3c79a47 - tinySA_v1.1-31-g063af84

Re: TinySA Not Showing In DfuSe Demo On Windows 10

#2335

Does it always show a different version? I know I made some errors (e.g. the showed number is one less than the filename says)
--

------------------------------------------

For more info on the tinySA go to https://tinysa.org/wiki/

Re: TinySA Not Showing In DfuSe Demo On Windows 10

#2334

I tried uninstalling and reinstalling via the Device Manager, but DfuSe Demo still did not recognize it.? However, I was able to install the driver by manually pointing it to the "STMicroelectronics" folder in the "Program Files (x86)" folder ("Include subfolders" checkbox checked).? DfuSe Demo was then able to recognize the TinySA.? Firmware update went smoothly thereafter, but the TinySA shows a different firmware version on the device than the firmware filename - not sure if that's normal.

Re: TinySA Not Showing In DfuSe Demo On Windows 10

#2333

With the STM32 BOOTLOADER device you can use dfu-util to load the new FW.
Or you can uninstall the device (right click on the device) and retry if you can make the connection

--

------------------------------------------

For more info on the tinySA go to https://tinysa.org/wiki/

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2332

If you need high accuracy (within 1dB) I also suggest to use a (nano)VNA
If you can not get both ends of the coax within 10cm and you are happy to be +/- 1dB two tinySA would do the job, one as signal generator and one as power meter (e.g. in zero span mode) or as spectrum analyzer
I've used the tinySA to check the signal levels in a coax distribution system in a house and it did the job very well.

----------------------------------------

For more info on the tinySA go to https://tinysa.org/wiki/

TinySA Not Showing In DfuSe Demo On Windows 10

#2331

I want to update the firmware on my new TinySA, but it won't show in the DfuSe Demo on Windows 10 (after entering DFU mode on the TinySA).? I went into "Device Manager" and it shows "STM32 BOOTLOADER" under "Other Devices".? If that is double-clicked, it says the drivers are not installed.? My understanding is that the drivers come with the DfuSe Demo program.? How do I get DfuSe Demo to recognize my TinySA?

Thanks,
Bryan

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2330

On Mon, Dec 14, 2020 at 06:15 PM, charlie carroll wrote:

you might consider a TDR if that function's available in something like a NanoVNA

It is.

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2329

开云体育

Tony:
You do not need 50-75 ohm matching when using the VNA approach described by AC6LA.

It really is as simple as hooking up a piece of the RG-6 to the 50-ohm port of a VNA and then measuring the resistance/reactance with the other end of the RG-6 shorted and then opened.? These measurements are then entered into Zplots for computation.

Here's a small piece of my measured data for a length of C59 by Davis RF; this was performed on my 50-ohm VNA.

Freq (MHz)??? |Zo|?? ?? Ro??????? Xo??????? VF????? Loss??? /100ft??? /100m??? |S21| (dB)??? Dist R(ft)
?? 1.000??? 73.534??? 73.477??? -2.882??? 0.6408??? 0.255??? 0.342??? 1.123?? ? 0.610???????? 57.675

FWIW, I've done several project where I've had to measure 75 ohm devices with 50 ohm test equipment.? I've used 3 different methods:
minimum loss pads like you suggested, homewound ferrite transformers (5:4 turns), and 75:50 ohm transformers from Minicircuits (ADT1.5-2+ is one example).? So, you have several options.

As John suggested, you might consider a TDR if that function's available in something like a NanoVNA.

73 charlie, k1xx

On 12/14/2020 8:04 PM, Tony Dudieron via groups.io wrote:

Show quoted text

Charlie,
??? Thank you for the valuable advice regarding the use of a VNA.? I will research the further tonight, which looks very interesting and reasonably priced (I like the use of N connectors instead of SMA too). Zplots looks excellent as well, thank you for bringing that gem to my attention!
??? With regard to the mismatch between the NanoVNA's 50 ohm impedance and the 75 ohm cable impedance, I'm thinking that a couple of 50 to 75 ohm minimum loss pads might be needed in order to get decent results.? Would you agree?
Tony

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2328

Something with a TDR (Time Domain Reflectometer) function would be ideal, not sure if the nanovna has that function, good luck anyway.

John

VE7KKQ

Show quoted text

On Mon, Dec 14, 2020 at 5:16 PM Tony Dudieron via <tdudieron=[email protected]> wrote:

Thanks John for replying back.? Many of these runs were already installed within the walls when I bought the house, so I don't know the exact lengths of all the cables. There are a couple for which I cannot read the manufacturer's label on the cable, although I know it is RG6.? But I do have samples for which I do know the exact length, so perhaps using a VNA and Zplots will be the way to go.
So it is not just a "can it be done this way" exercise but rather I was hoping to come up with a reasonable approach to validate that my calculated losses are close to reality, before I make any design changes to improve the system's performance.? Something better than a rough idea, I guess.
Best regards, Tony

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2327

Thanks John for replying back.? Many of these runs were already installed within the walls when I bought the house, so I don't know the exact lengths of all the cables. There are a couple for which I cannot read the manufacturer's label on the cable, although I know it is RG6.? But I do have samples for which I do know the exact length, so perhaps using a VNA and Zplots will be the way to go.
So it is not just a "can it be done this way" exercise but rather I was hoping to come up with a reasonable approach to validate that my calculated losses are close to reality, before I make any design changes to improve the system's performance.? Something better than a rough idea, I guess.
Best regards, Tony

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2326

Charlie,
??? Thank you for the valuable advice regarding the use of a VNA.? I will research the further tonight, which looks very interesting and reasonably priced (I like the use of N connectors instead of SMA too). Zplots looks excellent as well, thank you for bringing that gem to my attention!
??? With regard to the mismatch between the NanoVNA's 50 ohm impedance and the 75 ohm cable impedance, I'm thinking that a couple of 50 to 75 ohm minimum loss pads might be needed in order to get decent results.? Would you agree?
Tony

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2325

开云体育

Tony:
Let me suggest you use a Network Analyzer (maybe the NanoVNA?) and take a look at some of the work by AC6LA.? Start with which describes how to measure TL characteristics.? Second is to look at .? If you determine the TL parameters according to the first link, you can input that data into the second link and then compare your info with Dan's coax database.?

I've found the work by AC6LA to be excellent and have characterized a specific manufacture's 75-ohm coax for use in a 160 meter phased array.

I think this is a much easier approach that trying to worry about the uncertainties of using 2 TinySAs.

Regards

charlie, k1xx

On 12/14/2020 3:33 PM, Tony Dudieron via groups.io wrote:

Show quoted text

Hello all, I am wondering whether I could use two TinySAs, one as a signal generator and the other as a spectrum analyzer, to verify the amount of signal loss across various lengths of 75 ohm RG-6QS cable.? The frequencies of interest would be 200, 500, 600 and 700 MHz.? The system I am working on would be used for OTA television distribution.? I have tested the cables for return loss with a 75 ohm terminator at the far end, and the return losses are all between 36.8 and 40 dB, which to my understanding is pretty good.? The cables vary in length from 15 feet to 60 feet.

?

For each frequency, this would be done first by generating a known signal level with the TinySA that will be the signal generator, with the signal generator directly connected to the other TinySA (which will measure the signal) with an interconnect adapter (for the minimum loss possible).? I would then compare the directly connected signal level to the signal level shown on the SA when the cable under test is inserted between the signal generator and the SA.? I would also like to perform a similar process to verify losses through some high quality splitters that are rated to 1GHz (return loss at the input on these splitters are all between 35 and 40 dB when all output ports are terminated to 75 ohms).

?

The 75 ohm cable(s) that I am testing have the following loss specifications per 100 ft from the manufacturer:

200 MHz? 2.0db

400 MHz? 3.0dB

700 MHz? 5.9dB

?

My questions are:

will the performance of the TinySA, both as a signal generator at these frequencies and as a SA, be sufficient to provide me with useful data?? I am concerned whether the readings I obtain at the SA will be stable and accurate enough for the data to be of any value in accurately assessing cable losses on each leg of the system.

Will the impedance mismatch of the 50 ohm TinySA to the 75 ohm cable be a serious concern to me here, either as a signal generator or a SA?? I am considering using 50 ohm to 75 ohm resistive minimum loss pads (5.7dB loss).? If that is recommended, should I use a pad on both the signal generator as well as the SA?

Is there a better way to accomplish what I am trying to do above that won't be prohibitively expensive?? I have access to some other test gear, including analog and digital oscilloscopes, as well as an analog Instek RF signal generator (can reach 450 MHz via harmonics) and a freq counter.? I tried to do this using OTA over-the-air signals directly and measuring them with an ATSC analyzer, however, the OTA signal levels constantly change and are not steady enough for me to discern how much of the variation is due to cable losses.

I appreciate any input or advice anyone might be willing to offer.? Thanks in advance, Tony.

Re: Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2324

Tony,

Do you actually NEED to know the exact figure or is this an exercise in "can it be done this way" experiment?

If all you need is a rough idea, tape measure, data sheet and calculator.

John

VE7KKQ

Show quoted text

On Mon, Dec 14, 2020 at 1:05 PM Tony Dudieron via <tdudieron=[email protected]> wrote:

Hello all, I am wondering whether I could use two TinySAs, one as a signal generator and the other as a spectrum analyzer, to verify the amount of signal loss across various lengths of 75 ohm RG-6QS cable.? The frequencies of interest would be 200, 500, 600 and 700 MHz.? The system I am working on would be used for OTA television distribution.? I have tested the cables for return loss with a 75 ohm terminator at the far end, and the return losses are all between 36.8 and 40 dB, which to my understanding is pretty good.? The cables vary in length from 15 feet to 60 feet.

?

For each frequency, this would be done first by generating a known signal level with the TinySA that will be the signal generator, with the signal generator directly connected to the other TinySA (which will measure the signal) with an interconnect adapter (for the minimum loss possible).? I would then compare the directly connected signal level to the signal level shown on the SA when the cable under test is inserted between the signal generator and the SA.? I would also like to perform a similar process to verify losses through some high quality splitters that are rated to 1GHz (return loss at the input on these splitters are all between 35 and 40 dB when all output ports are terminated to 75 ohms).

?

The 75 ohm cable(s) that I am testing have the following loss specifications per 100 ft from the manufacturer:

200 MHz? 2.0db

400 MHz? 3.0dB

700 MHz? 5.9dB

?

My questions are:

will the performance of the TinySA, both as a signal generator at these frequencies and as a SA, be sufficient to provide me with useful data?? I am concerned whether the readings I obtain at the SA will be stable and accurate enough for the data to be of any value in accurately assessing cable losses on each leg of the system.

Will the impedance mismatch of the 50 ohm TinySA to the 75 ohm cable be a serious concern to me here, either as a signal generator or a SA?? I am considering using 50 ohm to 75 ohm resistive minimum loss pads (5.7dB loss).? If that is recommended, should I use a pad on both the signal generator as well as the SA?

Is there a better way to accomplish what I am trying to do above that won't be prohibitively expensive?? I have access to some other test gear, including analog and digital oscilloscopes, as well as an analog Instek RF signal generator (can reach 450 MHz via harmonics) and a freq counter.? I tried to do this using OTA over-the-air signals directly and measuring them with an ATSC analyzer, however, the OTA signal levels constantly change and are not steady enough for me to discern how much of the variation is due to cable losses.

I appreciate any input or advice anyone might be willing to offer.? Thanks in advance, Tony.

Using TinySA to verify 75 ohm RG6 cable losses? #tinysa

#2323

Hello all, I am wondering whether I could use two TinySAs, one as a signal generator and the other as a spectrum analyzer, to verify the amount of signal loss across various lengths of 75 ohm RG-6QS cable.? The frequencies of interest would be 200, 500, 600 and 700 MHz.? The system I am working on would be used for OTA television distribution.? I have tested the cables for return loss with a 75 ohm terminator at the far end, and the return losses are all between 36.8 and 40 dB, which to my understanding is pretty good.? The cables vary in length from 15 feet to 60 feet.

?

For each frequency, this would be done first by generating a known signal level with the TinySA that will be the signal generator, with the signal generator directly connected to the other TinySA (which will measure the signal) with an interconnect adapter (for the minimum loss possible).? I would then compare the directly connected signal level to the signal level shown on the SA when the cable under test is inserted between the signal generator and the SA.? I would also like to perform a similar process to verify losses through some high quality splitters that are rated to 1GHz (return loss at the input on these splitters are all between 35 and 40 dB when all output ports are terminated to 75 ohms).

?

The 75 ohm cable(s) that I am testing have the following loss specifications per 100 ft from the manufacturer:

200 MHz? 2.0db

400 MHz? 3.0dB

700 MHz? 5.9dB

?

My questions are:

will the performance of the TinySA, both as a signal generator at these frequencies and as a SA, be sufficient to provide me with useful data?? I am concerned whether the readings I obtain at the SA will be stable and accurate enough for the data to be of any value in accurately assessing cable losses on each leg of the system.
Will the impedance mismatch of the 50 ohm TinySA to the 75 ohm cable be a serious concern to me here, either as a signal generator or a SA?? I am considering using 50 ohm to 75 ohm resistive minimum loss pads (5.7dB loss).? If that is recommended, should I use a pad on both the signal generator as well as the SA?
Is there a better way to accomplish what I am trying to do above that won't be prohibitively expensive?? I have access to some other test gear, including analog and digital oscilloscopes, as well as an analog Instek RF signal generator (can reach 450 MHz via harmonics) and a freq counter.? I tried to do this using OTA over-the-air signals directly and measuring them with an ATSC analyzer, however, the OTA signal levels constantly change and are not steady enough for me to discern how much of the variation is due to cable losses.

I appreciate any input or advice anyone might be willing to offer.? Thanks in advance, Tony.

Re: White screen #bug_report

Victor

#2322

开云体育

Hi Erik,

Tried? this but the screen is still white after boot, but no more communication via the usb port.When i switch on power normally still a white screen but communication via pc is normal. The spectrum is visible with the app but changes in freq or level can't be made.Am I doing something wrong?

Thanks for your quik response,

Victor van Kooten

PA3FNY ?

Show quoted text

Open the case
temporarily connect Boot0 and Vdd on PCB edge close to the battery
switch on the tinySA, you should get a black screen.
no longer needed to connect Boot0 and VDD
connect USB
Now it should be possible to update the FW, preferably to stable version (not a beta version)

------------------------------------------

For more info on the tinySA go to

Re: Beta test channel - beta v1.1-52 #betatest

#2321

Thanks, Erik for quick response. ?

Yes, I was thinking it wasn’t a problem as far as the device or measurements went, but was just reporting it in case others saw the same thing and you wanted to comment on it.?

Regards,?
-Steve

Re: Beta test channel - beta v1.1-51 #betatest

#2320

On Mon, Dec 14, 2020 at 07:22 AM, geoff M0ORE wrote:

A bit off current topic and I don't want to distract from topic but how do you get a self test from the app. I have v1.1.4.6 installed and can't see any mention of self test or config.

Geoff,
? ?TinySA-App has a serial terminal window that can be used to send commands to the tinySA.? To send a command to perform a self test do the following:

? 1. In the main TinySA-App window select the USB icon.
? 2. The TinySA VNA Comms window will open:
? ? ? a. Change the "Paused/Un-Paused" slider button to "Pause" to pause communications.
? ? ? b. Select the "Clear" button to clear the Comms window.
? ? ? c. Type 'selftest 0' in the User command input box and <Enter> on your keyboard.
? ? ? d. Self Test should now be running on the tinySA.
? ? ??

?3.? If you only want to run an individual self test then type 'selftest 0 n', where n is the number of the self test to run (i.e. 'selftest 0 7' to run self test 7).

?4. When you are finished sending commands you can "Un-Pause" the Comms window and close it.

? - Herb