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Re: Measure frequencies down to 500khz with tinysa?
On Fri, Aug 30, 2024 at 07:06 AM, Erik Kaashoek wrote:
Be aware the dynamic range is reduced at such low frequencies.
What does that mean exactly? I don't understand what dynamic range means in relation to this.
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Re: What are sweep speed hardware bottlenecks?
So low IF is fed to DAC and then filtering is done digitally. And as nice side effect RBW also depends on FFT size.
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Does this make sense to improve scanning speed - SI4468 is replaced with down-converting mixer, IF of this mixer output is fed to STM32 ADC (with 14 or 16 bind resolution), filtering and FFT is done in STM32???
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Erik hi.
Zeenko replied that they do not send to the Russian Federation for political reasons. It is a pity that the Russian market is large and people will buy everything anyway, this is bad because they will support the pirate market in China. I am against copyright infringement, people spent money, effort and nerves on developing the device.
The generator uses a factory defined output calibration table that covers the whole frequency range,
for how to check and, if needed, correct this table
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Designer of the tinySA
For more info go to
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Re: Measure frequencies down to 500khz with tinysa?
I have measured frequencies down to 136 kHz with both the TinySA and the Ultra.
Zack W9SZ
On Fri, Aug 30, 2024 at 12:04?AM Roberth via <roberth.sjonoy= [email protected]> wrote: Hello, is possible at all to measure frequencies down to 500khz at all with an tinysa? If I have to understood it correctly it is possible with a larger antenna?
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The generator uses a factory defined output calibration table that covers the whole frequency range,
for how to check and, if needed, correct this table
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Designer of the tinySA
For more info go to
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Erik Please tell me, does the generator accuracy depend on the frequency? Will one calibration be enough, or do I need to do it by calibration points?
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If you are not confident in your oscilloscope, then you can still calibrate this way, don’t scold me too much, I did the description through a translator.
Calibration of the generator can be done by comparison.
We will need ATT -10dBm, RTL-SDR, SATSAGEN program.
The RTL-SDR has an output of +4.5 volts, so we use whatever ATT is available.
Connect the high output to the RTL-SDR input via ATT.
Enable tinySA CAL OUTPUT at 30 MHz and set it to HIGH INPUT mode to avoid interference from the high connector. The calibration output will provide an accurate -36 dBm signal.
Now connect the RTL-SDR to the tinySA's low output and set the tinySA to LOW OUTPUT mode, 30 MHz and level - 36 dBm. use R TL-SDR,
we have a difference of 1.5 dBm, we connect to tinySA via USB and enter the command
leveloffset low output -1.5
saveconfig 1234
to change the output level settings and save the data so that it remains after a reset.
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If you are not confident in your oscilloscope, then you can still calibrate this way, don’t scold me too much, I did the description through a translator.
Calibration of the generator can be done by comparison.
We will need ATT -10dBm, RTL-SDR, SATSAGEN program.
The RTL-SDR has an output of +4.5 volts, so we use whatever ATT is available.
Connect the high output to the RTL-SDR input via ATT.
Enable tinySA CAL OUTPUT at 30 MHz and set it to HIGH INPUT mode to avoid interference from the high connector. The calibration output will provide an accurate -36 dBm signal.
Now connect the RTL-SDR to the tinySA's low output and set the tinySA to LOW OUTPUT mode, 30 MHz and level - 36 dBm. use R TL-SDR,
we have a difference of 1.5 dBm, we connect to tinySA via USB and enter the command
leveloffset low output -1.5
saveconfig 1234
to change the output level settings and save the data so that it remains after a reset.
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Locked
Re: Measure frequencies down to 500khz with tinysa?
Both tinySA are officially specified down to 100 kHz
In practice the tinySA Basic will measure levels correctly down to 10 KHz and the Ultra down to 50 kHz?
Be aware the dynamic range is reduced at such low frequencies.
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Designer of the tinySA
For more info go to
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Locked
Measure frequencies down to 500khz with tinysa?
Hello, is possible at all to measure frequencies down to 500khz at all with an tinysa? If I have to understood it correctly it is possible with a larger antenna?
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Works for me.
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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 ?
Going from +10 to -40dBm is not changing by a factor of 50, rather by a factor of 100,000!
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Yep, that's why I said 50 dB! ;-)?
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Which?
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Designer of the tinySA
For more info go to
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See wiki: where to buy
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Designer of the tinySA
For more info go to
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oscilloscope is not a slander, you shouldn't trust the readings of a budget hantek, how can you get by with little bloodshed to check the generator level compliance? purchase on aliexpress from zeenko store where I used to buy my tinysa is no longer available, where can I buy the original?
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Stops scanning after enabling/disabling BIG NUMBERS
#bug_report
The trace stops showing signals when I do this: Turn on DISPLAY > BIG NUMBER, and then right after that turn off DISPLAY > BIG NUMBER.
Sometimes its needed to toggle few times for the spectrum signals to reappear.
Reset does not help.
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TinySA Ultra, ?tinySA4_v1.4-177-g1687fbc.bin firmware? (latest at this moment).
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Thank you
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-20dBm is about 22mV pd for 50 Ohms?
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Not sure what you’re measuring. ?
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Also not sure what accuracy spec your scope has
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Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
Don't forget that dB's are logarithmic.
Going from +10 to -40dBm is not changing by a factor of 50, rather by a factor of 100,000!
As has been said you are very unlikely to damage a TinySA in storage, particularly without an aerial!..
73
Jeff G8HUL
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of @glradio Sent: 28 August 2024 15:44 To: [email protected]Subject: Re: [tinysa] 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: Short Vertical (Whip) Antenna Matcher
This is what my FT897 S-Meter calibration looked like.
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The numbers shown in read are the dB difference between adjacent S point values.
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Less than 1 dB difference below S 5.
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Regards,
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Martin
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Brian Garber
Bruce Akhurst