1)? Again,.....and,.......again,? 28 kHz is WELL beyond the specified performance frequency of the TinySA.?
2)? Have a SERIOUS read of the specifications at: ?? ?????? 3? Any and all digital circuits may and will produce non-operational associated spurs.? Again,....., have a good visit to Mr. Fourier and the Fourier series.?
So what if there is a 28 kHs spur?? Consider 1 through 3, above.? No problem!!!
Now, can we end this thread??
Dave - W?LEV
On Sun, Nov 17, 2024 at 7:07?AM Bob Goodrich via <bobgoodrich84= [email protected]> wrote:
Here is what mine looks like. 0 on left, 50 KHz on right. DC Block and Short across the input. Doesn't change much with short removed.
On Saturday, November 16, 2024 at 09:23:14 AM PST, valis via <valis= [email protected]> wrote:
Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
?
Thanks.
?
Valis
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Locked
Re: Possible design issue with TinySA Ultra.
Super glue will not hold. Use something elastic that does not melt plastic. Something like composite glue, by far the best choice. If you want extra strength and flexibility (and you will need it) drench something like tissue paper or microfiber cloth (white fibers not actual cloth) in epoxy in it and use it between connector and plastic. Fibers do wonders when mixed with epoxy, think carbon fibres, same thing or fiberglass. Can get a bit messy and removing the connector from the chassis is not an option unless you apply small patches of fibre/epoxy. Don't let it drip into the connector but if it does WAIT until it dries and then scrape it off. If you smear wet epoxy over contacts you will have a much harder time removing it and it will clog the space around pins forever.
On Sun, Nov 17, 2024 at 12:11?PM Clyde Lambert via <clyde.lambert= [email protected]> wrote: Yes. That is if you don't want a chance of the socket ripping off the pcb when inserting a headphone plug.
I definitely did mine as the jack was hard to insert the plug in.
It's called preventative action. It is very easy to do.
Clyde KC7BJE?
-- SOFTECH, IGOR FEHER S.P.
Liminjanska cesta 96
6320 Portoro?
Slovenija
Tel: +386 41 872 601
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Locked
Re: Possible design issue with TinySA Ultra.
Yes. That is if you don't want a chance of the socket ripping off the pcb when inserting a headphone plug.
I definitely did mine as the jack was hard to insert the plug in.
It's called preventative action. It is very easy to do.
Clyde KC7BJE?
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Locked
Re: Possible design issue with TinySA Ultra.
Worth thinking about running? tiny bit of superglue under it if it's not damaged yet . .? ?
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Pleas charge your battery and check if the signal disappears
--
Designer of the tinySA
For more info go to
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Here is what mine looks like. 0 on left, 50 KHz on right. DC Block and Short across the input. Doesn't change much with short removed.
On Saturday, November 16, 2024 at 09:23:14 AM PST, valis via groups.io <valis@...> wrote:
Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
?
Thanks.
?
Valis
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TinySA Ultra with PC control
When I run a sweep with Max-hold for a few hours I notice that the PC disconnects the TinySA Ultra USB connection. I have to restart the TinySA Ultra and the software to get it going again.
?
I wonder what causes this.
?
thanks
?
Dieter, VK3FFB
?
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Yes, bottom end of the specified frequency range is 100 kHz.? I'd ignore anything below that.
The 28 kHz is highly likely due to a near-by or connecged switching charger or supply.? They all produce "dirt", a.k.a., RFI to a greater or lesser extent.
Dave - W?LEV
On Sat, Nov 16, 2024 at 10:38?PM Roger Need via <sailtamarack= [email protected]> wrote: On Sat, Nov 16, 2024 at 09:23 AM, valis wrote:
Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
I get the same signal at a level of -48 dB on my Ultra with a short on the antenna input.? It is a spur generated inside the tinySA.
?
BUT - You are operating below the published performance specs for the product.?
?
?
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On Sat, Nov 16, 2024 at 09:23 AM, valis wrote:
Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
I get the same signal at a level of -48 dB on my Ultra with a short on the antenna input.? It is a spur generated inside the tinySA.
?
BUT - You are operating below the published performance specs for the product.?
?
?
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28kHz is well below the specified lower frequency limit of the TinySA Ultra, which is stated as being 100kHz.
?
The fact you are seeing that signal, with no antenna, suggests a very dirty switching power supply in close proximity.
?
Regards,
?
Martin
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I think you are on the right track.?
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?
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The charger might switch at that frequency.? How does it perform with everything disconnected - no charger, no PC/laptop, and no USB cable?
Dave - W?LEV
Thx no nothing attached,
?
I observed it go from -43 dB to + 10db and back down into -40s. Had antenna connected at first, then disconnected just? and it was lying on the table on but not connected to anything. No cabling, just battery power. Now back up to + 11db disconnected. Weird.
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Valis,
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Use the appropriate cables to try the same setup when connected to a 50ohm dummy load. The device may be picking up stray signals in the shack, and the dummy load should reduce any stray EMF getting into the TinySA.
?
73
Evan
AC9TU
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Thx no nothing attached,
?
I observed it go from -43 dB to + 10db and back down into -40s. Had antenna connected at first, then disconnected just? and it was lying on the table on but not connected to anything. No cabling, just battery power. Now back up to + 11db disconnected. Weird.
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I should let Eric, its creator, chime in on this one. . . .???
?However, any digital electronic system will generate low and high frequency energy as a basic result of its operation.? Have a good visit with Mr. Fourier and the Fourier series.? All digital circuitry operates on square waves - a compilation of odd harmonics of the fundamental frequencies - just ones and zeros.? A good square wave at 1 GHz SHOULD contain harmonics to at least the 11th.? The old adage and "conventional knowledge" of supporting up to the fifth harmonic really does not produce a very good square wave!!? Eric did a wonderful job of keeping all this digital "garbage" out of the final display - the spectrum of RF energy!!
Dave - W?LEV?
Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
?
Thanks.
?
Valis
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Do you have a USB cable attached? If
so, try it without.
Bob S
On 11/16/24 09:23, valis via groups.io
wrote:
toggle quoted message
Show quoted text
Is the tiny sa ultra capable of glitching and self generating
a 28khz signal? Even without an antenna? Please see attached.
?
Thanks.
?
Valis
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Is the tiny sa ultra capable of glitching and self generating a 28khz signal? Even without an antenna? Please see attached.
?
Thanks.
?
Valis
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Locked
Re: Possible design issue with TinySA Ultra.
thank you for the hint and the picture, i will fix the headphone socket with some glue - before it will get loose..
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Locked
Re: Possible design issue with TinySA Ultra.
Thank you for a quick reply.?
I too am very interested in the new tinySA ULTRA plus.?
Regards,? F
Hi flynth, I'm very sorry, we did notice that the audio interface may be damaged, and expect that we'll be able to start selling the improved tinySA ULTRA plus by the end of this month.
You can contact your dealer for compensation.
R32 is 4.7k ohms.
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USB control in signal generator mode
Hi everyone,
? I ran into some trouble while developing a PC app to control the TinySA Ultra in signal generator mode via USB.? I had the output on/off control and output level working but when I went to set the frequency it failed, and even the stuff that was working stopped working.
?
It took me a day but I tracked the problem back to a mismatch between the wiki documentation and the actual implementation.? From the wiki it looks like you send something like "freq 145000000" but the actual code only does a pause_sweep(), breaking the output and level commands, while the call set_frequency(freq) is only calling a stub, not actually setting the frequency.
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I found a post that solved my problem using "sweep cw 145000000" instead.
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I think, short term at least, the wiki should be updated to reflect current code.? I wasn't sure if I should raise this as code issue since the wiki is not part of the code repo.
?
Cheers
? David - ZL2DAA
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Clyde Lambert
Bruce Akhurst
Dieter VK3FFB
Roger Need
