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TinySA Signal Generator Range

Steven Reed All Messages By This Member #5665 开云体育 A quick comment.? I have a new TinySA, running the 317 firmware.? I’m extremely happy with the device but have found a curiosity – the specifications state that the low output mode frequency range is 100kHz to 350MHz.? It appears – and I’m very happy about this – that the 100kHz lower limitation no longer exists.? I was able to drop down to 60kHz (needed for an IF alignment), and could easily go lower.? This is an astounding feature and means I can get rid of one of my signal generators the size of a small tank because nothing else I had would go below 100kHz.
Erik Kaashoek All Messages By This Member #5667 Although with some loss of performance you can go down to below 10kHz -- ------------------------------------------ For more info on the tinySA go to https://tinysa.org/wiki/
hwalker All Messages By This Member #5669 On Sat, Sep 4, 2021 at 10:20 AM, Steven Reed wrote: A quick comment.? I have a new TinySA, running the 317 firmware.? I’m extremely happy with the device but have found a curiosity – the specifications state that the low output mode frequency range is 100kHz to 350MHz.? It appears – and I’m very happy about this – that the 100kHz lower limitation no longer exists.? I was able to drop down to 60kHz (needed for an IF alignment), and could easily go lower.? This is an astounding feature and means I can get rid of one of my signal generators the size of a small tank because nothing else I had would go below 100kHz. Steve, ? ?Be aware that because of the loss through the output coupling capacitor (same as in the input path), the tinySA output below 100kHz will no longer maintain the +/-2dB level accuracy specification.? Ensure you add an appropriate capacitor correction factor if level accuracy is important to you. ? ?The coupling capacitor is the primary reason Erik notes the following on the Wiki "Specifications" page, "....frequency range from 100kHz to 350MHz (with some limitations down to 10kHz)".? The note is for the tinySA input frequency range but also applies to the output frequency range because the switched signal path is the same (See Wiki "Technical Description" page. ? I use a HP 11710B Down Converter to take the tinySA output down to 10kHz while still maintaining the +/-2dB level accuracy specification. ?- Herb
Steven Reed All Messages By This Member #5670 开云体育 For most of what I do (receiver alignments), level accuracy isn’t so much of an issue – it’s frequency accuracy that concerns me.? I ran the TinySA well below 100 kHz and was happy to see that it’s absolutely accurate (well, accurate enough).? I fed the output into a known good frequency counter and it’s right on the money, give or take a tiny fraction.? ? From: "[email protected]" <[email protected]> on behalf of hwalker <herbwalker2476@...> Reply-To: "[email protected]" <[email protected]> Date: Saturday, September 4, 2021 at 3:01 PM To: "[email protected]" <[email protected]> Subject: Re: [tinysa] TinySA Signal Generator Range ? toggle quoted message Show quoted text On Sat, Sep 4, 2021 at 10:20 AM, Steven Reed wrote: A quick comment.? I have a new TinySA, running the 317 firmware.? I’m extremely happy with the device but have found a curiosity – the specifications state that the low output mode frequency range is 100kHz to 350MHz.? It appears – and I’m very happy about this – that the 100kHz lower limitation no longer exists.? I was able to drop down to 60kHz (needed for an IF alignment), and could easily go lower.? This is an astounding feature and means I can get rid of one of my signal generators the size of a small tank because nothing else I had would go below 100kHz. Steve, ? ?Be aware that because of the loss through the output coupling capacitor (same as in the input path), the tinySA output below 100kHz will no longer maintain the +/-2dB level accuracy specification.? Ensure you add an appropriate capacitor correction factor if level accuracy is important to you. ? ?The coupling capacitor is the primary reason Erik notes the following on the Wiki "Specifications" page, "....frequency range from 100kHz to 350MHz (with some limitations down to 10kHz)".? The note is for the tinySA input frequency range but also applies to the output frequency range because the switched signal path is the same (See Wiki "Technical Description" page. ? I use a HP 11710B Down Converter to take the tinySA output down to 10kHz while still maintaining the +/-2dB level accuracy specification. ?- Herb
vbifyz All Messages By This Member #5680 Hi Steven, Modern PC soundcard can be a very good source below 80kHz. You need to make sure the output filter is switched to higher frequencies when the sampling rate is 192kHz. 73, Mike AF7KR

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