Re: Short Vertical (Whip) Antenna Matcher
I'm not picking on Kenwood, but I've measured their S-meter on HF.? Below S-9 each unit is between 3 and 1 dB difference.? It's pretty sad for calibration.? It took the transition to the SDR to have an S-meter measuring anything other than relative indications.? Whether it's 3 dB per S-unit (power) or 6 dB per S-unit (voltage), it is always understood what the meter indicates is in a non-inductive 50-ohm system.? Yes, we finally have S-meters that mean something!
Dave - W?LEV
On Wed, Aug 28, 2024 at 2:51?PM Andy G0FTD via <punkbiscuit= [email protected]> wrote: -73dbm and all that stuff.
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At least these days we get a good mix of good s-meter consistency these days.
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Many ham rigs with old style analogue s-meters from the 80's onwards became
very good at their calibration, with S9 being -73dbm and 6db per s-point.
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And these days, HT's have moved on too. They often used what I called a
"blob-o-meter" sytstem that never meant much.
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But we now have SDR's a plenty with -dbm scales too, and even a $10 Quansheng HT
with upgraded firmware will read -dbm too with good accuracy.
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in the old firmware my generator works quite accurately I set -20 dBm on the oscilloscope I get 72 millivolts, and on all subsequent firmware I set -20 dBm the oscilloscope shows 82 millivolts. is it possible to somehow save the generator calibrations to transfer to new firmware? tinysasa ultro original. I attach a dump of the old firmware
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Re: Short Vertical (Whip) Antenna Matcher
-73dbm and all that stuff.
?
At least these days we get a good mix of good s-meter consistency these days.
?
Many ham rigs with old style analogue s-meters from the 80's onwards became
very good at their calibration, with S9 being -73dbm and 6db per s-point.
?
And these days, HT's have moved on too. They often used what I called a
"blob-o-meter" sytstem that never meant much.
?
But we now have SDR's a plenty with -dbm scales too, and even a $10 Quansheng HT
with upgraded firmware will read -dbm too with good accuracy.
?
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Re: Short Vertical (Whip) Antenna Matcher
On Wed, Aug 28, 2024 at 01:54 AM, Geoff Peters - AB6BT wrote:
Not Andy but:
Thanks Geoff, you beat me to it.
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73 de Andy
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Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
On Tue, Aug 27, 2024 at 10:25 PM, Mike N2MS wrote:
If you are worried about the SMA connector place Male to Female adapter or a 3dB attenuator on the input.
I think I will do so, preferably the placed on the RF Input rather than a . After all, the cost of these components is not an issue ...
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Re: Short Vertical (Whip) Antenna Matcher
This has been the standard for a very long time.? -73 dBm is S-9 in a 50-ohm non-reactive system.? Collins Radio established that standard quite some time ago.?
Dave - W?LEV
On Tue, Aug 27, 2024 at 5:58?PM Clyde Lambert via <clyde.lambert= [email protected]> wrote: Hi Andy,
Where did you come up with -73dbm as to the signal level equal to an S9 level?
Clyde KC7BJE?
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Re: 5.8GHz wideband video signal measurements
On Wed, Aug 28, 2024 at 01:12 PM, Hugen wrote:
It will be available for sale on Zeenko's Aliexpress soon.
Ok, maybe let us know here when it will be available ;-)
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Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
On Wed, Aug 28, 2024 at 03:33 PM, Brian Garber wrote:
Are you measuring -40 dBm with or without the antenna ?
With the antenna attached.
My concern was about values well below the "Max input level" of +10dBm, but constant over time, even when the device is turned off.
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Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
The real danger of keeping the antenna connected is static electricity.
There is protection against static electricity damage inside the tinySA but this can not protect against all hazards,
It would be better to either remove the antenna when storing or use an isolated antenna that can not easily connect to charged items.
--
Designer of the tinySA
For more info go to
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Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
Are you measuring -40 dBm with or without the antenna? Either way you are well below Pmax at +10 dBm (by 50 dB and so converting to watts it's 10 mW, max vs 100 nW, measured). That max input value is found on the wiki and so you are good to store without any issues or additional hardware.?
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73, Brian WB8AM
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Re: Short Vertical (Whip) Antenna Matcher
..depending on frequency and history.
you should have a look to e.g. https://www.giangrandi.org/electronics/radio/smeter.shtml
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Re: 5.8GHz wideband video signal measurements
On Wed, Aug 28, 2024 at 02:43 AM, @glradio wrote:
Should the LNA integrated in the TinySA Ultra be disabled or does the effect of the external one add to the former ?
The internal LNA should be disabled, otherwise you have a risk of overloading.
The gain of the ZK-06 is fairly flat above 1 GHz so setting an EXT GAIN of 22 dB should give you accurate (+/- 2dB) power readings up to 6 GHz
--
Designer of the tinySA
For more info go to
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Thank you for your clarification, Erik.
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Re: 5.8GHz wideband video signal measurements
The LNA integrated in the TinySA Ultra is effective below 3.5 GHz, and you can use the ZK06 LNA to improve sensitivity above 3.5 GHz.?
It will be available for sale on Zeenko's Aliexpress soon.
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Re: 5.8GHz wideband video signal measurements
On Wed, Aug 28, 2024 at 03:59 AM, Hugen wrote:
We have made some LNAs for increasing the sensitivity at 5.8GHz, you can try using the zk-06 LNA module.
What is the advantage they offer over the LNA embedded in the TinySA Ultra ?
Should the LNA integrated in the TinySA Ultra be disabled or does the effect of the external one add to the former ?
Lastly, where can they be purchased ? On Zeenko's website and Aliexpress page there are no photos or links for purchase.
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The tinySA-saver app should NOT be used as it is a quick and dirty derivation from the nanoVNA-Saver app which uses complex data points.
The tinySA has no information about the phase so the imaginary part is always set to zero.
Search a wiki for a more recent python application
--
Designer of the tinySA
For more info go to
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Re: 5.8GHz wideband video signal measurements
On Wed, Aug 28, 2024 at 03:59 AM, Hugen wrote:
zk-06
they look very interesting! but where can we buy them? I couldn't find a shop...
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best 73
de
i2NDT Claudio
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Dear all,
I am trying to extract data from TinySAsaver using the code from this repository: .
I connected my TinySA Ultra to a signal generator set to generate a frequency of 4 GHz. The signal is captured well on the TinySA screen, which shows a peak at 4 GHz. However, when I debug the code to see the value of the readings using TinySAsaver, I noticed that for each data point in self.data or self.data21 within the dataUpdated() function, the imaginary parts are always exactly 0, while only the real parts change. Each data point contains 3 core feature: frequency, real, image.
Is this expected behavior, or am I doing something wrong in my experiment? It seems strange to me that all of the readings have a 0 value for the imaginary part. I tried searching on this forum but couldn’t find an answer.
Thank you for your support.
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Re: What are sweep speed hardware bottlenecks?
Furthermore, the implementation of digital filters combined with correction factors can reduce the sweep time by thousands of times. See Blake Peterson Spectrum Analysis Basics Keysight AN150
adri
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----- Messaggio originale -----
Da: Erik Kaashoek via groups.io < erik@...>
Inviato: 28/08/2024 08:36:28
Oggetto: Re: [tinysa] What are sweep speed hardware bottlenecks?
More expensive SA's use faster IF sampling and wider FFT filters.
--
Designer of the tinySA
For more info go to
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Re: What are sweep speed hardware bottlenecks?
More expensive SA's use faster IF sampling and wider FFT filters.
--
Designer of the tinySA
For more info go to
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Brian Garber