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Re: Sensitivity?
Jim Whartenby
Martin
My understanding is that loop antennas respond to the magnetic component of the EM wave and dipoles respond to the electric component.? In your case, I'm not sure if the distance to the source of the interference is a factor.??
Your neighborhood power distribution transformer might be at fault.? If you can rig up a small loop with a portable radio receiver, you should be able to triangulate and narrow down the search area.
Regards,
Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
-----Original Message-----
From: martinbradford2001 <martin.a.bradford@...> To: [email protected] Sent: Sat, Jan 28, 2023 11:28 am Subject: Re: [tinysa] Sensitivity? On Sat, Jan 28, 2023 at 04:58 PM, Jim Higgins wrote:
Hmmm, don't have any traffic lights within a radius of close to a mile... Given the very significant difference in levels between my two antennae (both of which have a similar radiation pattern), I'm thinking that it must be something very local and pretty low power. I have a doublet resonant roughly on 20m at about 30 feet close to the house which I use for transmitting and a low-noise small loop which is strictly RX only and mounted at the end of the garden. The RFI is strong on that loop, but barely measurable on the doublet. Apart from this specific RFI, the loop remains the lower noise of the two. Martin (G8FXC) |
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Re: tinySA_remote.py - Python tool for remote control of the tinySA from the PC
On Sat, Jan 28, 2023 at 06:15 PM, Ho-Ro wrote:
The error is: "-d dev/ttyACM0", must be "-d /dev/ttyACM0"Hi Martin, I realised my mistake soon after posting, the leading / for the comport was missing. To be honest this test was part of a something I abandoned many months ago on my Linux Mint 20.3 machine. I was curious to see if it worked with the old original Nano VNA (not H), but alas it doesn't. I just get an error about the screen size. $ sudo python3 nanovna_remote.py capture error - wrong screen size? Normal I think, since your software is not for the old Nano VNA ;-) Anyway, I shall be purchasing a Tiny SA soon, so the effort will not be wasted. Hopefully I can make it work on my Raspberry Pi3B+ too. Vy 73 de Andy |
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Re: tinySA_remote.py - Python tool for remote control of the tinySA from the PC
On Sat, Jan 28, 2023 at 06:41 PM, Andy G0FTD wrote:
sudo python3 nanovna_remote.py -d dev/ttyACM0 -z2Andy, The error is: "-d dev/ttyACM0", must be "-d /dev/ttyACM0" But no need to use the -d unless your device is at an unusual port, e.g. on a mac. Just use: sudo python3 nanovna_remote.py -z2 What's your system, how did you install? On Debian (or another system based on Debian, e.g. Mint or Ubuntu) you can simply type "make deb" and "make debinstall" that installs also the correct udev rule that allows user access to the USB serial port - no need to run as root which is always a bad thing. ? Otherwise you should install also the file "60-nano-tiny.rules" into "/etc/udev/rules.d". Martin |
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Re: tinySA_remote.py - Python tool for remote control of the tinySA from the PC
I have installed this script, but I think that I am not specifying the comport correctly.
My attempt to list ports gives this: dmesg | grep tty [??? 0.112805] printk: console [tty0] enabled [?? 73.156225] AMD0020:00: ttyS4 at MMIO 0xfedc6000 (irq = 10, base_baud = 3000000) is a 16550A [?? 73.157050] AMD0020:01: ttyS5 at MMIO 0xfedc8000 (irq = 11, base_baud = 3000000) is a 16550A [602297.254857] cdc_acm 2-1:1.0: ttyACM0: USB ACM device [602324.263919] cdc_acm 2-1:1.0: ttyACM0: USB ACM device To start the script I have been trying : sudo python3 nanovna_remote.py -d dev/ttyACM0 -z2 Traceback (most recent call last): ? File "/usr/local/lib/python3.8/dist-packages/serial/serialposix.py", line 322, in open ??? self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK) FileNotFoundError: [Errno 2] No such file or directory: 'dev/ttyACM0' So, am I using incorrect comport syntax, if so what format should I use. Thanks. 73 de Andy |
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Re: Sensitivity?
Hi,
youcan look in the
They are aprooved seller, I have ordered my TinySAs and my Ultra from them.
Good seller for my personal experience.
All the Best,
Isidro
herunterladen
Am 28. Jan. 2023, um 10:25, martinbradford2001 <martin.a.bradford@...> schrieb: On Sat, Jan 28, 2023 at 05:54 AM, <patrick.de_meyer@...> wrote: |
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Re: Sensitivity?
martinbradford2001
On Sat, Jan 28, 2023 at 04:58 PM, Jim Higgins wrote:
Hmmm, don't have any traffic lights within a radius of close to a mile... Given the very significant difference in levels between my two antennae (both of which have a similar radiation pattern), I'm thinking that it must be something very local and pretty low power. I have a doublet resonant roughly on 20m at about 30 feet close to the house which I use for transmitting and a low-noise small loop which is strictly RX only and mounted at the end of the garden. The RFI is strong on that loop, but barely measurable on the doublet. Apart from this specific RFI, the loop remains the lower noise of the two. Martin (G8FXC) |
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Re: Sensitivity?
On Sat, Jan 28, 2023 at 09:25 AM, martinbradford2001 wrote:
I can't find any UK supplier promising a delivery before early March.Hi Martin, Apart from the increased sensitivity the Ultra has a lot of features that make it a whole lot better than the basic Tiny, and having used both I'd say that it is definitely worth the difference in price. March isn't that far away, but I've always bought mine directly from the approved Zeenko store in China and never had any problems. You it is possible that you may run some risk in the event of warranty issues, but the saving made by buying from China may help offset this. Personally if it did go wrong I'd either try and fix it myself, or simply buy whatever is the latest model and keep the broken one for spares, but your priorities may be different. Either way, I'm sure you will very much enjoy using one. Regards, Martin |
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Re: Sensitivity?
At 1/28/2023 09:25 UTC martinbradford2001 wrote:
I'm not aware of any Teslas nearby. In any case, the RFI seems to be 24/7, so it would have to be a Tesla that is never actually used. Seems unlikely to be lights or solar power either - lights would only be on at night and solar power would only be active during the day. It's a recent addition - I only started to see it just before Christmas. It also seems to be quite localised... Look into LED traffic lights. In the USA, the LEDs are in rows and a row or two can burn out while the light of that color is still usable. When some burn out the multiplexing scheme seems to start creating a LOT of RFI. I had this very same problem and it was the local traffic lights with a row or more of LEDs burned out. And like I said, I'm in the USA. Maybe not applicable to your situation, then again, maybe so. 73 de Jim, KB3PU |
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Re: Sensitivity?
My tinySA shows a noise floor, for 3KHz BW 500KHz span, of -110dBm, S4, red trace.
My T2FD antenna TD90 shows noise floor of -90dBm at quiet frequency and signals peaks of -55dBm. My vertical MALDOL? HVU-8 shows 10dB worst at same frequencies TD90. My current conclusion is, TinySA does not need extra devices to measure signal/noise higher than S4. Because slow sacan 500KHz span for 3KHz BW, maxhold and patience is needed. Otherwise 5KHz span allows fast scan and does not need maxhold function. |
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Re: Sensitivity?
martinbradford2001
On Sat, Jan 28, 2023 at 05:54 AM, <patrick.de_meyer@...> wrote:
Hi Martin ,I'm not aware of any Teslas nearby. In any case, the RFI seems to be 24/7, so it would have to be a Tesla that is never actually used. Seems unlikely to be lights or solar power either - lights would only be on at night and solar power would only be active during the day. It's a recent addition - I only started to see it just before Christmas. It also seems to be quite localised - I have a doublet at about 30 feet which is my transmitting antenna and a small loop at the end of the garden which is my low-noise receive antenna. This new RFI is barely visible on the doublet, but strong on the loop, so I'm guessing that the RFI source is somewhere behind the back fence of the garden. I can relocate the RX loop without too much difficulty, but I would like to pin down the RFI source first - I don't want to go relocating the antenna multiple times looking for a quiet spot.? To Martin (the other one), thanks for the information on the different models. I was hoping to be able to get away with a basic tinySA - partly because of the price difference, but mostly because there seems to be a long lead-time on the Ultra. I can't find any UK supplier promising a delivery before early March. There's no shortage of basic tinySAs, but no point in buying one if it is not going to do the job... The RFI is an annoyance, but not bad enough to stop me operating - I'll wait for stock of the Ultra... Martin (G8FXC) |
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Re: #feature_request - its a great sign and endorsement
#feature_request
Erik,
its a very good sign that customer are clambering for extra features. It shows we love the product and want more. Consider if no-one was bothered, you would be hurt Take the positive from this, and start work on Mk2 ( and make the ROM storage twice what you need or can envisage) Mike |
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Re: #feature_request
#feature_request
Easy to build if you have:
- space - power - money May I suggest you open your tinySA and try to find space for the 3 amplifiers stages required to get some dynamic range?. And try to find a component configuration that is stable, even with the huge gain of the cascaded amplifiers. -- For more info on the tinySA go to https://tinysa.org/wiki/ |
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Re: #feature_request
#feature_request
If they are so easy to build, I would think it would not be a burden, and everything would be self-contained...
regards Colin |
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Re: Sensitivity?
I have a tiny SA and a TinySA Ultra, and I have also used them to try and track down noise sources.
In my opinion the Tiny SA does not have sufficient sensitivity, for what you are proposing. As Erik says you could use an external pre-amplifier, or an active antenna, which is pretty much the same thing, but it all gets a bit messy if you wish to carry it around. If you don't have either version, and are now considering buying one, go for the TinySA Ultra, it is definitely worth the additional cost and I would highly recommend it. The TinySA Ultra can be used with a short whip antenna <30cm, and I've found it to be adequate to locate noise sources by walking around the neighbourhood. As a guide, it has sufficient sensitivity to be able to hear short and medium wave broadcast stations, just using the short whip, but it's not as good as a dedicated portable radio for that purpose. Mine also works well with a small handheld tuned loop antenna of <0.5m diameter, that I use for direction finding to locate noise sources at a greater distance. Regards, Martin |
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Sensitivity?
martinbradford2001
Hi all. first post from a new member...
I have an RFI problem which is impacting on several HF bands and I'm trying to track down the source. Functionally, a tinySA looks like the right tool, but I'm worried about the sensitivity. I currently have a Xiegu X6100 - which is not a slouch as a receiver - and I've been experimenting using that to track down the noise, but the results are not great. My main rig is an FTdx101D with a doublet at about 30 feet. My RFI source produces peaks of noise one or two kHz wide which wander from side to side by maybe 1kHz - and several of them are sitting just above the bottom of an amateur band - the worst is on about 14.08MHz. On the FTdx101D with the doublet connected, the noise peak reads just over S9. On the X6100 with the doublet connected, it's similar - perhaps slightly weaker, but still an S8/9 signal and well defined.? I put an HF whip antenna - about 18 inches long, helically wound - onto the X6100 and it barely registers the noise. Since I know that it is there, I can see it on the waterfall, but if you didn't know it was there, you could easily miss it. Hence my concern about the tinySA - how sensitive is it with the telescopic whip that is supplied with it? I need sufficient gain that this signal will show at a decent amplitude with an antenna that I can realistically carry round to seek out the noise source!? TIA Martin (G8FXC) |
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Re: #about_wiki
#about_wiki
Wiki part on markers is updated as the text was wrong
-- For more info on the tinySA go to https://tinysa.org/wiki/ |
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Re: #about_wiki
#about_wiki
I understand, it's about a black number on a light background. The question is removed.
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Ho-Ro
Juan Pablo EA4CIV
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