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Harmonic measurement. Question for Eric
Eric,
When I measure harmonics I always use? well defined high pass filters that suppresses the fundamental by >50db. The commercial spectrum analyzer I use at work lets me input the attenuation of the fundamental as a value in db. This permits the measurement of harmonics that are very small (-110 to -120dbc) without overloading the front end. Would it be possible to do with the ultra? It should be just a mathematical function that doesn't impact the function of the analyzer it self. The read out would be the reduced fundamental + offset , and harmonics in dbc to the combined fundamental value. John |
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Re: My tinySA Ultra Signal level Critical
#ultra
When I turn off LNA? I generate CAL out at 30Mhz it work fine .
But I turn on LNA look like this. I backed to the old firmware. |
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Re: My tinySA Ultra Signal level Critical
#ultra
After I update firmware?
Connector work normal |
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Re: New TinySA-ULTRA Case (3D print) on Thingiverse
#ultra
On 16/01/2023 21:03, Larry McElhiney via groups.io wrote:
Hi Folks,Where can this be bought, please, Larry? Not that it's likely to be economic for the UK, though. I did search and find: but no purchase price. 73, David GM8ARV -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv |
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Re: Find RX frequency with RF generator and sweep.
There's another way to do this that might be easier: "sniff" the receiver's local oscillator with the tinySA and calculate the receive frequency from that.? It helps if you know the first IF (Intermediate Frequency) of the receiver, and you can probably find a manual for the radio and find out the first IF frequency easily enough.? If you can't look up the frequency of the first IF, you can figure it out from one of the channels you've already tracked down.? A popular first IF frequency used to be 45 MHz, with low side local oscillator injection.? Assume the desired receive frequency is 472.55 MHz, and the receiver uses low side injection.? The local oscillator will be at 427.55 MHz (472.55 - 45 MHz).? You can pick up the local oscillator with the antenna that comes with the tinySA, or with a "sniffer" loop consisting of a few turns of wire.? Look for a signal that pops up when you tune the radio to each channel, measure the frequency, add or subtract the frequency of the first IF depending whether the radio uses high or low side injection, write it down, and move on to the next channel.? All bets are off if this is a direct sampling analog to digital type receiver, of course.
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Re: My tinySA Ultra Signal level Critical
#ultra
After I replace RF switch all look ok I can LevelCal not Critical level .
But I SELF TEST? ?test 13 not pass. |
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Re: Linux Mint USB
#tinysa
I am able to use both my tinySA and my tinySA Ultra with Linux Mint 20.3 Cinnamon and tinySA-saver 0.2.2.? Are you using the latest version of tinySA-saver from github?
I have heard some have had problems connecting with USB3, but USB2 works OK.? If you have problems with one, you might try the other.? Try hitting the rescan button if saver doesn't see your tinySA. I hadn't used tinySA-saver in some time and just installed the latest version recently when I got the Ultra.? I used git clone https://github.com/erikkaashoek/tinySA-saver in a terminal to download, then used cd to switch to the newly created folder and followed the directions for Ubuntu in the README.MD file, except that I just used python3 where the instructions specified python3.7 since Mint 20.3 is using python 3.8.10 and will use that automatically when given the command python3.? Python3 and pip were already installed, so I ignored that part of the instructions to install those. |
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Re: Tune a duplexer
#features
#file-notice
开云体育guess I should've splaineed myself more gooderer, i.e. on the "referenced" page there is a LINK < > where the page goes to 404, sometimes talking (figure of speech) gets me in "HOT" water, nuxxed time I'll be most careful. :0) Mike C. On 1/16/2023 8:59 PM, Bob Snyder wrote:
Hi Mike, |
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Re: Tune a duplexer
#features
#file-notice
开云体育sure, after you skew down the page you'll find all sorts of ads, is that the idea? Mike C. Sand Mtn GA On 1/16/2023 8:50 PM, Bob Snyder wrote:
Works for me. |
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Re: Tune a duplexer
#features
#file-notice
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John Cunliffe W7ZQ
Igor - PY3IG
David J Taylor
Jim Allyn - N7JA
Mike C.