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Re: tinysa ultra attentual and signal level fail

 

Impossible to tell
--
Designer of the tinySA
For more info go to

Re: Manual fault finding

 

Thanks. I inaugurated my cheap hot air station and the RF switch gently came off. Now i could jumper it to check the attenuator, but i prefer waiting for the spare part and soldering paste, and keep soldering on the board a minimum. Btw the accident occured with a unfinished homebrew LISN (TVS diodes didn't fit...), so it taught me that a transient limiter does make sense :)
Re: tinysa ultra attentual and signal level fail

 

Is this one a clone? because if not, I'd be keen to try and replace the attenuator, or go through the trouble shooting more closely and try and fix it.?
Re: tinysa ultra attentual and signal level fail

 

On Sat, Mar 15, 2025 at 10:50 PM, a4notebook wrote:
I bought tinysa ultra from facebook. It fails attentuator and signal level. Can it be fixed? can it be used as a signal generator?
Maybe, no
?
--
Designer of the tinySA
For more info go to

Re: Manual fault finding

 

What you are observing is indeed possible as the switch can fail in?different ways
?
--
Designer of the tinySA
For more info go to

tinysa ultra attentual and signal level fail

 

Hi?
?
I bought tinysa ultra from facebook. It fails attentuator and signal level. Can it be fixed? can it be used as a signal generator?
Re: Manual fault finding

 

Hi Erik,
yes i performed the manual routine and think it is useful. I have a low signal level on my Ultra 407, down by 40 dB, i.e. at -75 dBm. Now your manual says that even with a bad RF switch, if the signal stays within 6 dB of that level when the LNA is enabled, then the LNA is fine. However, on mine, when i enable the LNA, it even goes up to where it should be, -35 dBm. Have you ever had this before ?
The manual testing of the attenuator behaves as it should, the noise floor goes up by as much as the attenuation, maintaining the level @30 MHz.
I ordered new switches.
My conclusion is that my switch makes a low impedance only when it is in normal (non-LNA) mode, and this is rather unusual because typically you expect it makes a low impedance in either position. I hope it is not the attenuator that causes the low impedance but else behaves normally in producing the correct relative levels ?
Re: Interval Triggering working great (apology to Erik)

 

Comment regarding the interval time of 32.6msec that I used. ?An exact multiple of 1/60 would have been 33.3…..msec but to get a stable display I had to set it to 32.6msec. ?Difference is likely related to accuracy of the TinySA clock and/or timing errors/accuracy within the TinySA code.
?
just FYI,
Don wd8dsb?
Re: What accessories do I need for a TinySA Ultra?

 

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?If I remember right, the HP network analyzers have a ‘skip isolation’ option in their cal routine, making me think it won’t make much difference in most cases - especially in a Nano.

On Mar 15, 2025, at 10:47?AM, W0LEV via groups.io <davearea51a@...> wrote:

?
1)? Yes, for isolation, both ports should have a non-reactive 50-ohm resistor installed.

2)? It's excellent insurance to install the following on each port.? From MiniCircuits:

????????? VLM-33W-2W-S+

It's especially important on the source port.


It's presently under redesign by MiniCircuits.? Just wait.? Both Mouser and Digikey will stock it.

Dave - W?LEV

On Sat, Mar 15, 2025 at 12:57?AM Matthew Rapaport via <quineatal=[email protected]> wrote:
Hello Erik!?
To do a proper ISOLATION calibration you need 2 load stubs. The nanoVNA only comes with one???
?
Matthew?
KD6KVH?



--
Dave - W?LEV
Interval Triggering working great (apology to Erik)

 

Hi Erik and gang,
?
I owe Erik an apology as not to long ago I said the interval triggering feature that Erik implemented for me a few years ago on the TinySA was not working properly on my TinySA Ultra.? In a recent post that Erik responded to someone on a different topic he mentioned setting the RBW to 850 KHz when using Zero Span mode and that made me revisit the interval triggering feature as I had ignored the RBW setting when using interval triggering.
?
Today I tested the interval triggering feature with the display sweep time set to 20 msec, trigger interval set at 32.6msec which is a multiple of 1/60 (60 being the power line frequency in the US), set the RBW to 850 KHz, and the Zero Span frequency set to 146 MHz which is a frequency I know I can hear RFI that's generated by an LED light dimmer in my family room that I use for testing the interval trigger feature.? I then turned on the LED lights and I can easily see the light dimmer going into conduction at a frequency of 120 Hz which would be each half cycle of the 60 hertz sinewave and it's a very stable display (apparently in sync with the 60 Hertz line frequency which is what I was hoping for).? I've attached a screen shot showing the display generated by my LED light dimmer driving LED can lights (antenna used was a homebrew Moxon beam designed for 146 MHz).
?
I originally wanted this interval trigger feature to help track down RFI like power line noise that's in sync with the electrical grid frequency, and will now continue my work on this subject now that I better appreciate the setting of RBW when in zero span mode.? Having the ability to trigger in sync with the electrical grid is beneficial when there are other signals present which are not necessarily in sync while you are attempting to see signals in sync with the grid.
?
Bottom line is that the interval trigger feature appears to working great and having the RBW set to 850 KHz really helps.
?
Big Thanks to Erik,
Don (wd8dsb)

Zero Span Mode.jpg

Re: WinSpectrum III spectrum analyzer application designed for Windows users working with Tiny SA Ultra+

 

WinSpectrum III v3.0.1.1 – Update & Fixes
Some users reported that nothing was displayed on the graph when using tinySA (basic). The issue was caused by WinSpectrum's default scan setting of 450 points, which the tinySA (basic) does not support (it has a 290-point limit).
Fixed in version 3.0.1.1: WinSpectrum III now detects tinySA (basic) failure when the number of points exceeds 290, adjusts the scan to 290 points, and correctly displays the graph—no user intervention required.
Additionally, this update includes several improvements and fixes:
? Added LNA on/off command.
? Start/Stop Frequencies are now displayed at the bottom of the graph.
? Fixed logfile reading issue.
? Various marker-related fixes and improvements.
? Added Delta calculation for markers.
Tested successfully on tinySA (basic) version 1.4-40, tinySA Ultra (non plus) version 1.4-156 and tinySA Ultra+ versions 1.4-196 and 1.4.197.
About the marker's 'Tolerance' field
Some users may wonder why WinSpectrum III includes a Tolerance (%) setting for peak markers when this parameter is not explicitly found in most VNAs, Spectrum Analyzers, or tinySA devices.
This feature is not mandatory and does not modify the raw measurement data. Instead, it is an optional tool that helps locate peaks within a user-defined range rather than just a single frequency point.
For example, if a peak frequency is set to 10 MHz with a 5% tolerance, WinSpectrum will search for the highest peak within the 9.5 MHz to 10.5 MHz range, rather than just at 10 MHz. This can be useful in cases where signals fluctuate slightly due to environmental factors or device tolerances.
The goal of this feature is to make peak identification more flexible and user-friendly, especially when dealing with noisy signals or spectral variations. Of course, if users prefer a fixed peak frequency search, they can simply ignore this setting.
73?
WinSpectrum III v3.0.1.1 – Update & Fixes

 

Some users reported that nothing was displayed on the graph when using tinySA (basic). The issue was caused by WinSpectrum's default scan setting of 450 points, which the tinySA (basic) does not support (it has a 290-point limit).
Fixed in version 3.0.1.1: WinSpectrum III now detects tinySA (basic) failure when the number of points exceeds 290, adjusts the scan to 290 points, and correctly displays the graph—no user intervention required.
?
Additionally, this update includes several improvements and fixes:
? Added LNA on/off command.
? Start/Stop Frequencies are now displayed at the bottom of the graph.
? Fixed logfile reading issue.
? Various marker-related fixes and improvements.
? Added Delta calculation for markers.
?
Tested successfully on tinySA (basic) version 1.4-40, tinySA Ultra (non plus) version 1.4-156 and tinySA Ultra+ versions 1.4-196 and 1.4.197.
?
About the marker's 'Tolerance' field
Some users may wonder why WinSpectrum III includes a Tolerance (%) setting for peak markers when this parameter is not explicitly found in most VNAs, Spectrum Analyzers, or tinySA devices.
This feature is not mandatory and does not modify the raw measurement data. Instead, it is an optional tool that helps locate peaks within a user-defined range rather than just a single frequency point.
For example, if a peak frequency is set to 10 MHz with a 5% tolerance, WinSpectrum will search for the highest peak within the 9.5 MHz to 10.5 MHz range, rather than just at 10 MHz. This can be useful in cases where signals fluctuate slightly due to environmental factors or device tolerances.
The goal of this feature is to make peak identification more flexible and user-friendly, especially when dealing with noisy signals or spectral variations. Of course, if users prefer a fixed peak frequency search, they can simply ignore this setting.
?
https://xrjunque.nom.es/swdownload#winspectrum
?
73?
Re: What accessories do I need for a TinySA Ultra?

 

No this is not just an attenuator.? It is a limiter with silicon devices.? You can buy limiter diodes and build several yourself if you don't want to pay $63 for good insurance.? That's your decision.? I have and use one on every spectrum analyzer I have (too many).?

Dave - W ?LEV

On Sat, Mar 15, 2025 at 6:40?PM Matthew Rapaport via <quineatal=[email protected]> wrote:
So help me understand... This is basically an attenuator, but only for signals above a certain threshold, letting weaker ones through without attenuating them??
?
Matthew?
KD6KVH?



--
Dave - W?LEV
Re: What accessories do I need for a TinySA Ultra?

 

So help me understand... This is basically an attenuator, but only for signals above a certain threshold, letting weaker ones through without attenuating them??
?
Matthew?
KD6KVH?
2025 SVHFS Conference Update

 

Below is an update on the schedule of speakers and presentations for the Southeastern VHF Society Conference. The conference will be held at the Quality Inn at Exit #4 in Clarksville, TN April 4-5, 2025. This is an opportunity to meet other VHF+ enthusiasts, learn, exchange ideas, and have FUN. The $69 registration fee for the?conference is required, and it includes a 1 year membership in the SVHFS. Details are here:?. Advance registration?is highly recommended as the hotel requires a head count in order to prepare the food for the event. There will be door prizes given away at the banquet on Saturday evening. Feel free to contact me??via?email if you have any questions:?RobinK4IDC@....

Preliminary 2025 SVHFS Conference Schedule

Friday

8:00 AM Registration

9:00 Charles Osborne -K4CSO – RF Zero - 30 min

9:30 Robin Midgett – K4IDC – RF Zero 2 Meter Beacon- 30 min

10:00 Bob Lear – W4ZST Power Dividers and Cable Loops – 30 min

10:30 15 Minute Break

10:45 Mike Stipick – KC4RI – 5.7 GHz SDR Transceiver - 45 min

11:30 Bill Pence – Grid Square Locator – 30 min

12:00 PM Lunch - Steve and Sandra Kostro – Designing a Multi Band Transverter

1:15

2:00 Paul Wielozenski - K4PEW - VHF Nets – 30 min

2:30 Ben Lowe – Rover Radiators – 30 min

3:00 George Presley – 10 GHz Beacon – 30 min

4:00 Charles Osborne / Kent O’ Dell – 10GHz Antenna test Range - 30 min

5:00 Dinner –On your own

7:00 Swap Fest and Hospitality Suite

Saturday

9:00 AM Brian McCarthy – Lunar Rover Truck, 2.3GHz Amp – 1 hour

10:00 Peter Van Horne – KA6U - Moon Bounce Rover – 45 min

10:45 15 Minute Break

11:00 Chris Arthur - NV4B – 45 min

12:00 PM Lunch - On your own

1:30 Larry Cagle - K4WLO – Meteor Scatter with MSK144 - 45 min

2:15 SVHFS Business Meeting

3:00 – 5:00 Rover Round Up and 10GHz Antenna Range

6:00 Social Hour- Hotel Bar

7:00 Dinner Banquet followed by the Door Prize Extravaganza!?



Thanks,
Robin Midgett K4IDC


Thanks,
Robin Midgett K4IDC
Re: What accessories do I need for a TinySA Ultra?

 

1)? Yes, for isolation, both ports should have a non-reactive 50-ohm resistor installed.

2)? It's excellent insurance to install the following on each port.? From MiniCircuits:

????????? VLM-33W-2W-S+

It's especially important on the source port.


It's presently under redesign by MiniCircuits.? Just wait.? Both Mouser and Digikey will stock it.

Dave - W?LEV

On Sat, Mar 15, 2025 at 12:57?AM Matthew Rapaport via <quineatal=[email protected]> wrote:
Hello Erik!?
To do a proper ISOLATION calibration you need 2 load stubs. The nanoVNA only comes with one???
?
Matthew?
KD6KVH?



--
Dave - W?LEV
Re: What accessories do I need for a TinySA Ultra?

 

Hello Erik!?
To do a proper ISOLATION calibration you need 2 load stubs. The nanoVNA only comes with one???
?
Matthew?
KD6KVH?
Re: Settings for measure Lora signals

 

Seems to work pretty good like you said?
Thank you so much!
Re: Settings for measure Lora signals

 

To do pure power measurement at a known transmit frequency (or small range of frequencies) it may be better to switch to zero span mode and set the RBW to 850 kHz.
This will convert the tinySA into a narrow band scope.
This because with short transmission bursts a scan may partially miss the transmission.
In zero span mode you can monitor rather short bursts
--
Designer of the tinySA
For more info go to

Settings for measure Lora signals

 

Hello there,?
?

I am having some strange behaviors between rx and tx in my personal project and have thought of using tinysa to better monitor what is going on.
The use will be for short/medium range so there is no need to measure signals below -90db at most.
?
My settings are BW500khz, SF5 and 868.0 Mhz, I have set tinySA center frequency 868, span 500Khz and I see perfectly the signals but, depending on the RWB I use, I get a RSSI or another, I would like to know what would be the appropriate settings or any advice to compare the RSSI between tinySA and LoRA modules.
?
Thanks!
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