On Tue, Jul 28, 2020 at 12:51 PM, hwalker wrote:
? Is the Aliexpress store an official hugen second source??
The Aliexpress store is an official hugen second source also managed by Maggie Plenty of stock again on Aliexpress!!!!
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Re: tinySA listed on Aliexpress
Hi,
I bought the one after yours and they say delivery in October. - shrug -
I have survived 73 years without it so a few more days won't matter very much.
73,
Bill KU8H
bark less - wag more
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On 7/28/20 2:28 PM, Igor Jobim wrote: I bought the last unit on AliExpress. Everything must go well.
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Re: Tracking generator option
On Tue, Jul 28, 2020 at 01:26 PM, hwalker wrote:
?A third option is to put one tinySA in max hold and step a second tinySA/rf generator 290 points using the same step-size as the first tinySA.? I get a pretty clean trace that way, but haven't figured out how to normalize a max-hold trace.
? I swept a filter using the proposed third option and realized that a limitation is that harmonics of the tinySA output are 40dB down.? That's actually pretty good for a $50.00 device, but in MAX-HOLD it also means you can't see more than 40dB down because the harmonics lead the sweep.
? The alternative is not to do MAX-HOLD and instead read the peak carrier level at each 290 point generator step, and plot the accumulated data in an external program.? That should get you 70dB or more of dynamic range.??
- Herb
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Re: Tracking generator option
On Tue, Jul 28, 2020 at 12:58 PM, Erik Kaashoek wrote:
Currently impossible for high range.
Without an extra mixer, so only two tinySA the offset is max about 700kHz
If you add in an extra mixer any offset is possible
Erik,
? I think the topic deserves its own Wiki entry with specific details for the two tinySA with offset set-up, and using two tinySA's (or one tinySA & external 433.8MHz source) with external mixer and attenuator/preamp for isolation.
? A third option is to put one tinySA in max hold and step a second tinySA/rf generator 290 points using the same step-size as the first tinySA.? I get a pretty clean trace that way, but haven't figured out how to normalize a max-hold trace.
? Most modern specans offer a tracking generator option, so the topic will address those user's looking for a similar feature on the tinySA.? With the availability of the nanoVNA for s21 measurements, the tracking option is not a must have feature for me - unless it can do >70dB down from 100kHz - 350MHz.
- Herb
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Re: Tracking generator option
On Tue, Jul 28, 2020 at 03:17 PM, Erik Kaashoek wrote:
See first post on this subject
The two links made me understand how it works. https://tinysa.org/wiki/pmwiki.php?n=Main.MODULATION
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On Tue, Jul 28, 2020 at 11:18 AM, Erik Kaashoek wrote:
Current batch is mostly sold. Next production batch is ordered but it may take some weeks before it will be available
? ?One bit of information that I found surprising is that list of buyers at the Alibaba store are almost all European or North American customers.? I always thought the bulk of sells on the Alibaba were to the Asian market. ? ?Did hugen announce? the first run to his Asian customers?? Hopefully, positive reviews will start flowing in by the time the second production run is offered for sell.? Get some rest, you deserve it. - Herb
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Re: Tracking generator option
Currently impossible for high range.
Without an extra mixer, so only two tinySA the offset is max about 700kHz
If you add in an extra mixer any offset is possible
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Hi Erik and all I updated the report se delete the one I published yesterday.
I now get the same OIP3 figures as you. The levels must be much higher than the -30dBm I used to generate the better OIP3 figures .
However by using a 10dB internal Atten the figures raises 10dB now the TinySA is acting more linear. The TinySA.exe also show good result on OIP3 but it is needed to toggle the RBW as repeating the measurement is chooses a very strange wide RBW so there is a bug Kind regards Kurt ? ? On Mon, Jul 27, 2020 at 11:22 PM, Erik Kaashoek wrote: The value of +4.7dBm is surprisingly low. It should be above +15dBm.
Here are my measurements. Only settings changed from default where RBW set to manual 10kHz in second measurement both with attenuation set to manual and 0dB
First two signals at 0dBm with combiner loss of 3dB
Then the same signals set to -10dBm to check if the measurement is OK
The IP3 signals drop indeed 20dB when lowering the input with 10dB so what you see is internally generated.
Adding 10dB input attenuations drops them into the noise floor
I'm very curious why you measure a much different value
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On Tue, Jul 28, 2020 at 11:18 AM, Erik Kaashoek wrote:
Current batch is mostly sold. Next production batch is ordered but it may take some weeks before it will be available
? Congrats, Erik.? I never had a doubt that at its price point and list of features that the tinySA would find a large audience.? Many members of my ham club brought two so that they could dedicate one as a RF generator. ? I didn't notice you added a second store at?? until one of the other members mentioned it.? I always purchase from hugen's Alibaba store so that is the only source I have been recommending.? Is the Aliexpress store an official hugen second source?? In any event, that source is sold out and hugen's Alibaba store had less than 20 units the last time I looked. ? Again, congrats on a fine first production run to you and hugen.? Continued good fortune in the future. ? BTW, don't rest on your laurels like the V2 did and let the competition get a leg up on you with slicker packaging and better marketing. - Herb
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Re: Tracking generator option
So far as I can see, the given examples show a tracking generator operating over the low range. Is it also possible to sweep the high range?
Additionally, how much offset does the current approach permit?
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Re: tinySA listed on Aliexpress
I bought the last unit on AliExpress. Everything must go well.
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Current batch is mostly sold. Next production batch is ordered but it may take some weeks before it will be available
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Re: Tracking generator option
On Tue, Jul 28, 2020 at 11:13 AM, Igor Jobim wrote:
Would nanoVNA as a tracking generator be an option?
See first post on this subject
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Re: Tracking generator option
Would nanoVNA as a tracking generator be an option?
Thank you!
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Re: tinySA listed on Aliexpress
Herb,
the aliexpress shop from Eriks link points to Zeenko Store. I bought one today morning with paypal as payment source as always.
No problems there...
Did somebody know this store? Is it safe?
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Wiki open for group members to contribute
In anticipation of user contributed content I opened the wiki page on [email protected]?for all group members The wiki home page can only be edited by me.?Ping me if you need a new subcategory on the home page
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Re: Shipping notification
Got mine too a few minutes ago. My order was placed Thursday morning at 6:47EDT or 10:47UTC. This will be my first SA, so I better start to climb the leaning curve.?
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I just got an email notice from Alibaba that my TinySA has shipped. I probably got in one of the first orders (I went to the site nine minutes after the email arrived) so I may have been near the front of the line, but it does mean the shipping process has begun.
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Re: A comment to the TinySA.exe
Hi DiSlord Thank you very much for clarifying these details Kind regards Kurt ? ? TinySA internal for calculation use measure?data * 32, for not send negative values additional add 128
This 32 multiplier need for not use slow floating point calculations, and give error 1/32 ~ 0,03 in dBm (measure step is 0.5dBm, and other is calibrations error)
And this values used for get correct data in program, need substract 128 and divide on 32
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Re: A comment to the TinySA.exe
Hi Herb Thank you for the comments. DiSlord has also clarified why these two settings are made I am sure Erik will update the ini file accordingly als the weird behavior with log frequency settings Kind regards Kurt ? ? ? On Mon, Jul 27, 2020 at 02:06 PM, Kurt Poulsen wrote: Hi Erik I slowly learn to treat the TinySA the right way.
One funny detail is that the vertical grid lines for the Log sweep show up when Center frequency is set to 0 and the span to max frequency. The ini file need and update like Herb has pointed out as the Level per dB must be 32 and not 2 and Herb mention the -125 should be changed to -128 why I have not figured out. Kind regards Kurt
Kurt,
? When I originally ran TinySA.exe the levels displayed in the application were 3dB different than those on the tinySA display.? I questioned Erik about the difference and he said it was caused by the "zero level" value under the 'Settings'.
? Per Erik, "If you go to the setting tab in TinySA,exe the "zero level" should be set to 128".
?Also per Erik, "zero level' values other than '128' are an error in the initial automatic configuration of TinySA.exe.?
My understanding is the 'zero level' setting will be depreciated in a future TinySA.exe release.? Until then I've just make it a habit of changing the 'zero level' setting to '128' whenever I update the TinySA.exe application.
Further comments on TinySA.exe from Erik:
1.? Is there a tinySA.exe software manual available??
? ? ? ?"No tinySA.exe was my swiss army knife SW for SA experiments, too complex for anyone else. I still need to simplify and create some wiki pages"
2.? When I right click on the tinySA.exe screen and "select marker", I don't see a marker display.? I have yet to figure out how to turn markers on.
? ? ? ?"Only automatic markers are implemented. No manual markers yet"
Automatic markers are implemented by setting a threshold for marker display.? Manual placement is a much needed addition to TinySA.exe.
- Herb
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Igor - PY3IG
Kurt Poulsen
dekagon
Shirley Dulcey KE1L