Re: test 7 flatness fail, and the output power is 7-8dbm lower then displayed
Hi Erik,?
if i set the tinysa to output -10dbm at say 100mhz the real output is only -17.5 -18dbm so the output gain is a lot lower then it should be , do i have a bad amp stage in the tinysa,
this happens on lower frq and up,
using low out sma on the tinysa
Thanks Dave
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Re: test 7 flatness fail, and the output power is 7-8dbm lower then displayed
On Tue, Dec 13, 2022 at 04:37 AM, davebb123456 wrote:
running the latest firmware on a tinysa i am getting, test 7 flatness fail,
Can you share a screen capture or photo of test 7 failing. The fail is due to overly strict criteria as we are only now collecting statistical data on the correct boundaries for test 7
and the output power is 7-8dbm lower then displayed, measured with a HP test set,
Do you mean tinySA output level is 7-8dBm lower? of the level as measured by the tinySA?
is this why it is failing test 7 flatness ?
No, see description above
can i increase the output power to match the tinysa read out, or is this a fault with one of the parts,
Which output power? tinysa?? We are busy creating a new FW that uses an updated set of output calibrations matching with the latest production samples. ? --
For more info on the tinySA go to https://tinysa.org/wiki/
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test 7 flatness fail, and the output power is 7-8dbm lower then displayed
running the latest firmware on a tinysa i am getting, test 7 flatness fail,
and the output power is 7-8dbm lower then displayed, measured with a HP test set, is this why it is failing test 7 flatness ?
can i increase the output power to match the tinysa read out, or is this a fault with one of the parts,
Thanks Dave 2E0DMB
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Brian, After you double checked with the cal output I can only say that your tinySA should be within the +/- 2dB error and it is not messed up. I can not explain the difference with your wattmeter. Maybe one more test you can do is to use the 40dB attenuator as the dummy load for your wattmeter so you can measure with the tinySA and the wattmeter at the same time using exactly the same load to your HT --
For more info on the tinySA go to https://tinysa.org/wiki/
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He who measures the temperature with more than one thermometer doesn't know the temperature.
He who reads more than one time keeping device doesn't know what time it is.
He who measures the humidity with more than one instrument doesn't know what the humidity is.?
On and on and on....
Where do the error bars overlap??? The venerable Bird watt meter is only good to ¡À5% of full scale.?
I'd presume you used an attenuator in front of the SA to prevent burnout of the SA.? What is the error bar on the attenuator?
Dave - W?LEV
Brian,
Your measurement technique and math are both correct.?
(EE and extra class license here so I know enough to be dangerous!)
I looked up your SWR meter and it is spec'd as "Accuracy: mean +/- 5%".
I'm not exactly sure of what is meant by this, % of reading or % of full scale.
Instruments rated at % of full scale may not be very accurate at the low end of course.
So I looked for reviews for your power meter, some guys say it's accurate, some not.
Probably a lot of operator misunderstanding or error though.
Anyway, if I understand correctly you measure 4.35 watts with your power meter and 2.7 watts with the Tiny.
So 36.4 dbm and 34.3 dbm respectively.
If the power meter is reading 5% high then you would actually have only 4.13 Watts or 36.2 dbm.
If the Tiny is 10% low 2.95 Watts or 34.7 dbm would be your output.
36.4 and 34.3 is a difference of 2.1 dbm.? ?(Check my math - I didn't take the time to).
Assuming one device low and the other high brings the measurements closer but you still have enough difference to question a bit while realizing we can't expect HP/Agilent type accuracy out of these inexpensive but wonderful instruments.? I am very happy with my TinySA. Considering the low cost I think it's accuracy is fine for purpose. I do have an ancient HP432A? calibrated probably decades ago to compare it to and it's pretty good.
Hopefully you can come up with a 3rd option to narrow this down.? Maybe take your HT to a club meeting or hamfest and find someone with another instrument to try.? ?Good luck.
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ultra arrived and box modified
12 days from ordering and very well packed etc. from Zeenko.
Display is perfect as is the rest of the unit, let the games begin....
Had an idea to make the box more useful, just cut a strip of cardboard and double side taped it to take up the space of the white cover.
Looks like this and the ultra sits on top of it just fine, to take it out i found it easy to tip the ultra out in your hand and then remove the clear
top to get access to the storage compartment underneath;
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Brian,
Your measurement technique and math are both correct.
(EE and extra class license here so I know enough to be dangerous!)
I looked up your SWR meter and it is spec'd as "Accuracy: mean +/- 5%".
I'm not exactly sure of what is meant by this, % of reading or % of full scale.
Instruments rated at % of full scale may not be very accurate at the low end of course.
So I looked for reviews for your power meter, some guys say it's accurate, some not.
Probably a lot of operator misunderstanding or error though.
Anyway, if I understand correctly you measure 4.35 watts with your power meter and 2.7 watts with the Tiny.
So 36.4 dbm and 34.3 dbm respectively.
If the power meter is reading 5% high then you would actually have only 4.13 Watts or 36.2 dbm.
If the Tiny is 10% low 2.95 Watts or 34.7 dbm would be your output.
36.4 and 34.3 is a difference of 2.1 dbm. (Check my math - I didn't take the time to).
Assuming one device low and the other high brings the measurements closer but you still have enough difference to question a bit while realizing we can't expect HP/Agilent type accuracy out of these inexpensive but wonderful instruments. I am very happy with my TinySA. Considering the low cost I think it's accuracy is fine for purpose. I do have an ancient HP432A calibrated probably decades ago to compare it to and it's pretty good.
Hopefully you can come up with a 3rd option to narrow this down. Maybe take your HT to a club meeting or hamfest and find someone with another instrument to try. Good luck.
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Nicely built.? Just be careful if you walk around with the whip antenna attached.? You can build up quite a static charge walking over carpet...
Roger
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That's a great idea! ??
Roy WA0YMH?
On Mon, Dec 12, 2022, 4:16 PM Terry Perdue < K8tp@...> wrote: Simple idea FWIW. Nylon rod, tapped 1/4x36 on one end, with a tapered notch into a 13/64 hole 3/4¡± from the other end.
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Hi,
Here's what I did.? Let me know if I need to perform any steps differently.
Mode / Cal Output: 30 MHz
At the 30 MHz measurement I did:
CONFIG/MORE/LEVEL CORRECTION/INPUT LEVEL
Then entered: -26.2 x1
I did my measurements again and it's still at 33.5 dBm.
My wattmeter is a Surecom SW-33 Plus terminated with a??5-20W DUMMY LOAD.
I guess my question at this point is it time to get ahold of a new TinySA and see if my current unit may be messed up?
Thanks,
Brian
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Re: TinySA Ultra - Hardware version "unknown"
Re touch calibration. This is done on the NanoVNA with Dislords software, so it should be possible to make it for the TinySA.
73/Torbjorn/SM6AYM
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Re: Spectrum Analyzer Low Frequency Converter BG7TBL
2022. 12. 12. 17:50 keltez¨¦ssel,
hwalker ¨ªrta:
On Mon, Dec 12, 2022 at 07:45 AM, Mike C. wrote:
Hi All,
Has anyone taken note of
above subject, specifically how it may interface or be part
of our tinySA Ultra?
Mike,
? "atten:Input the 10M reference of the spectrum into
the machine, set the center frequency to 10M, and reduce the
SPAN from 4M to the smallest SPAN."
? Seems to have been designed for a spectrum analyzer with
a 10MHz reference output which the tinySA Ultra does not have.
Herb
_._,_._,_
Hello,
I think, it is an up-converter=mixer inside. The 10Mhz reference
input is the local oscillator of the mixer.
It is up-converts the 0-2Mhz range to 10-12Mhz.
Joco
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Simple idea FWIW. Nylon rod, tapped 1/4x36 on one end, with a tapered notch into a 13/64 hole 3/4¡± from the other end.
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Re: Links to a new video produced by Kurt Poulsen (that is me :)
Hi THE BOSS Thank you for the feed back Funny enough my YouTube nick name is THE BOSS ? Kind regards Kurt ? ? Thanks Kurt for this and other video's.
It is interesting that someone like you with a good assortment of microwave test equipment has such a passion for the new ultra.
Mine is on it's way and i am studying anything related to it with great interest.
Like many others just got some old gear and started playing with it and got better with all
the functions and where to find them ( with my bad memory ) and got a tinysa a while ago, more playing.....
My jaw dropped when i saw the screenshots going up to 18 gHz, That's just wild and i hope we get more video's to show how it's done
and where it leads, special attention is required to not overload the ultra with lower freq's such as capacitive coupling etc.,
Good to watch the information storm and learn from it, Eric is such a wealth of knowledge and quick to apply things.
Best of luck and thanks for your contribution, Max.
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Thanks, never considered that.
Rich
On 12/12/2022 12:56 PM, Erik Kaashoek
wrote:
toggle quoted message
Show quoted text
The tinySA has 57 different resolution filters but not on the
exact 1,3, 10 grid
The Ultra has fewer but better on the 1,3, 10 grid
--
For more info on the tinySA go to
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#ultra Touch calibration
#ultra
Is it possible to move the calibration points for touch calibration a little bit to the middle of the screen? At the moment they are exactly in the corners of the screen. You need a very thin pen to calibrate. Most of touch pens are a little bit bigger and you can't reach the corner exactly.
--
Klaus, DL5KV
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Re: Links to a new video produced by Kurt Poulsen (that is me :)
Thanks Kurt for this and other video's.
It is interesting that someone like you with a good assortment of microwave test equipment has such a passion for the new ultra.
Mine is on it's way and i am studying anything related to it with great interest.
Like many others just got some old gear and started playing with it and got better with all
the functions and where to find them ( with my bad memory ) and got a tinysa a while ago, more playing.....
My jaw dropped when i saw the screenshots going up to 18 gHz, That's just wild and i hope we get more video's to show how it's done
and where it leads, special attention is required to not overload the ultra with lower freq's such as capacitive coupling etc.,
Good to watch the information storm and learn from it, Eric is such a wealth of knowledge and quick to apply things.
Best of luck and thanks for your contribution, Max.
|
The tinySA has 57 different resolution filters but not on the exact 1,3, 10 grid
The Ultra has fewer but better on the 1,3, 10 grid --
For more info on the tinySA go to https://tinysa.org/wiki/
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I am not saying this an issue.
When you set the RBW to 10Khz on the TinySA the display shows 11Khz, on the Ultra it shows 10Khz.? Same with 30 khz.? The TinySA shows 32khz while the Ultra shows 30khz.
I am just curious why they are different?
Rich
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Re: Spectrum Analyzer Low Frequency Converter BG7TBL
On Mon, Dec 12, 2022 at 07:45 AM, Mike C. wrote:
Hi All,
Has anyone taken note of above subject, specifically how it may interface or be part of our tinySA Ultra?
Mike, ? " atten:Input the 10M reference of the spectrum into the machine, set the center frequency to 10M, and reduce the SPAN from 4M to the smallest SPAN."
? Seems to have been designed for a spectrum analyzer with a 10MHz reference output which the tinySA Ultra does not have. Herb
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Roger Need
Kurt Poulsen