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Re: VBW influence
On Thu, Jun 6, 2024 at 03:44 AM, <scnuzmj@...> wrote:
I have confusion about the infulence of VBW, in my knowledge, according to the block diagram of the spectrum analyzer, when VBW > RBW, the bandwidth of VBW will great than the video signal(limited by RBW), so the video filter will not filter the video signal, then the change of VBW(still great than RBW) should not affect the smooth effect of the trace. But the actual display is not suitable for this guess, I think I must miss something about video filter.? The VBW in the tinySA is implemented using a moving point average that simulates a RC filter.? It performs the same as the CONFIG->SAMPLE REP menu option, except the repetition samples and sweep times have been calibrated for each video bandwidth to approximate the equivalent performance of the selected VBW. ? The moving point average implementation of the VBW was the best solution Erik was able provide for anticipated users of the tinySA within the cost constraints of the original project. Herb |
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Re: TinySA Ultra generates signals while sweeping
I have a 3586B and an 89441. Just above DC-32MHz on the first, with audio demod and super accurate signal level indicator,sensitive to about -120dBm with switchable narrow filters, and a just above DC -10MHz SpecAn on the second. Both are gobs more sensitive below 10KHz, or even 100KHz than any amateur radio transceiver I have ever used. Just because it will display the frequency does not mean it receives there, at least according to my HP and cheap Chinese signal generators.
I have played with a loop antenna some, but this thread has kindled a dormant interest again.? |
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Re: TinySA Ultra generates signals while sweeping
¿ªÔÆÌåÓýNot exactly portable but if you want to go diving into the weeds, try the HP-3561A. Not light at 33lbs but frequency would be hard to beat at 0.000125Hz to 100kHz. Pricey back in it's day at 12k$. Even has it's own tracking generator. No answer needed, just smile. Mike C. Sand Mtn GA On 6/6/2024 2:00 PM, Martin via
groups.io wrote:
On Thu, Jun 6, 2024 at 04:21 PM, Bruce Hawkins wrote: |
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Re: VBW influence
John, well put and a well justified warning about YouToob.? I usually give the same caution.? Gain knowledge or answer questions from the pros or those who know what they are doing.? Avoid YouToob done by self-proclaimed experts or here-say opinions. Dave - W?LEV On Fri, Jun 7, 2024 at 8:32?PM John Cunliffe W7ZQ via <w7zq=[email protected]> wrote: True, but there is an equal amount of false and erroneous information on YouTube. Personally, I would stay away from hobbyists made videos? and stay with the commercial outlets like Rohde, Agilent and others that know what they are talking about. Rohde has a very large library of videos showing how spectrum analyzers work. -- Dave - W?LEV |
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Re: VBW influence
True, but there is an equal amount of false and erroneous information on YouTube. Personally, I would stay away from hobbyists made videos? and stay with the commercial outlets like Rohde, Agilent and others that know what they are talking about. Rohde has a very large library of videos showing how spectrum analyzers work.
I have heard it being called LoonTube since every loon can make a video, post it and 10000 lunatics will agree with them without questioning anything. John |
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Re: RADIATED EMISSIONS FROM TINYSA-ULTRA
On Thu, Jun 6, 2024 at 11:54 AM, W0LEV wrote:
Again, this quick evaluation of RE from the TinySA - Ultras in no way, shape, or manner, intentional or unintentional, reflects anything to address regulatory RE levels.? ?Actually, no need to imply anything regarding regulatory RE levels.? The sticker on the back of the tinySA Ultra shows that it is FCC and CE-mark compliant. ? Using a magnetic loop or e-field probe is helpful for troubleshooting emissions problems or perhaps comparing different samples, but as you cautioned, does not necessarily reflect regulatory radiated field levels. Herb |
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RADIATED EMISSIONS FROM TINYSA-ULTRA
The question regarding radiated emissions from the TinySA - Ultra originated over on the NanoVNA users group.? I have three (don't ask) TinySA Ultras.? I checked all three employing the identical setup I used to evaluate radiated emissions from the NanoVNAs (nothing on the electronic work bench has changed in the intervening 2-days).? Please refer to the "ADDEMDUM" posting on the NanoVNA-users groupio in that regard for setup. I'm happy to report, with that setup identical to my evaluation of REs from the NanoVNAs, the TinySA - Ultras (at least the three I own - don't ask) are squeaky clean and exhibit absolute minimal radiated emissions.? Even though they are not required to pass Part 15 of the FCC rules (as test equipment, they are subject to Part 18 which is considerably more liberal), I'm sure they would pass with flying colors. Again, this quick evaluation of RE from the TinySA - Ultras in no way, shape, or manner, intentional or unintentional, reflects anything to address regulatory RE levels. ? Dave - W?LEV |
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Re: TinySA Ultra generates signals while sweeping
Any tests of the TinySAs will be posted on that dedicated site, not here.l Dave - W?LEV On Thu, Jun 6, 2024 at 6:27?PM W0LEV via <davearea51a=[email protected]> wrote:
-- Dave - W?LEV |
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Re: TinySA Ultra generates signals while sweeping
Take a visit to the McGeevy site.? The following should get you going: ???? There's also a link at the very bottom that is of interest. We are addressing electromagnetic energy at AUDIO frequencies.? Some may even be detected by connecting a long wire or loop to the sound input to any PC or laptop. Dave - W?LEV On Thu, Jun 6, 2024 at 4:21?PM Bruce Hawkins via <ac6dn=[email protected]> wrote:
-- Dave - W?LEV |
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Re: Display replacement
On Thu, Jun 6, 2024 at 10:08 AM, <GamzeeMakara2000@...> wrote:
7 inches?? If you are referring to the LiteVNA64 then go to /g/nanovna-beta-test/ subscribe to the group and search the message base for "Test 7 inch screen". ? If you are referring to the tinySA Ultra, then see Stan Dye's reply at /g/tinysa/message/16968? Herb |
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Re: Display replacement
7" is still experimental,? requires significant hardware technical skills to install on litevna64.? Only one person has done it that I am aware of,? in? nanovna-beta group. On Thu, Jun 6, 2024, 11:08 AM GamzeeMakara2000 via <GamzeeMakara2000=[email protected]> wrote: 7 inches? |
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Re: TinySA Ultra generates signals while sweeping
On Thu, Jun 6, 2024 at 04:21 PM, Bruce Hawkins wrote:
But they go quite low. The next real problem is the antenna. For the SA or the HF receiver (30, 100kHz is not uncommon).Most of the PA0RDT type E-Probe antennas will work down to at least 10kHz, but noise and interference is a problem in Urban environments. If you are really keen, you can try to hear the Earth's Shumann resonances at around 7, 14 and 20Hz, YES, I did mean Hz. These folks mange to do it. Regards, Martin |
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Re: TinySA Ultra generates signals while sweeping
Bruce Hawkins
Hi Dave, Some people are actually sensitive to RF. But it usually, Watts's of power. Not necessarily meant to be a joke. Bruce Hawkins AC6DN On Monday, June 3, 2024 at 02:16:06 PM CDT, W0LEV <davearea51a@...> wrote: On Mon, Jun 3, 2024 at 6:22?PM Sam Reaves via <sam.reaves=[email protected]> wrote:
-- Dave - W?LEV |
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Re: TinySA Ultra generates signals while sweeping
Bruce Hawkins
A lot of my HF HAM radios work down there. But there specs aren't guaranteed. I've never tested them down there as well. But they go quite low. The next real problem is the antenna. For the SA or the HF receiver (30, 100kHz is not uncommon). Bruce Hawkins AC6DN On Wednesday, June 5, 2024 at 09:48:30 AM CDT, Matt Harris <kd4pbs@...> wrote: ?On Mon, Jun 3, 2024 at 08:02 PM, vbifyz wrote: I attribute some of my eye and skin damage to it, confirmed by doctors. Talk about horrors. Now that I have had a day (and morning coffee) I see that?I am the one who also didn't detect the sarcasm font ;)? Ha!? Thanks, Mike! On Tue, Jun 4, 2024 at 11:29 AM, Bruce Hawkins wrote: big radio noises heard coming from Earth. This info about the VLF signals is interesting.? Too bad the TinySA is virtually deaf at these frequencies, but understandably; a highly sensitive and selective VLF/ULF receiver is oddly difficult (read "expen$ive) to create. |
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Re: Display replacement
For the similar nanovna, each different screen size requires different firmware modifications - they have done the 2.8", 4", and recently adapted a 7" display to the newer litevna.? So it is highly unlikely that there is any plug-n-play larger screen for the tinySA.? On Thu, Jun 6, 2024, 9:31 AM m0cnl via <m1cxz.m0cnl=[email protected]> wrote: Just had the thought that maybe if the display uses spi, then something designed for an arduino or raspberry pi could be used. |
Mike C.
John Cunliffe W7ZQ
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