Don¡¯t know if it helps, but this is the information I get when I see another gateway: 
|
Many thanks for all the input.
I¡¯m trying to detect LoRa signal (868mhz), there are specific products do do this (??). As I understand it (although it¡¯s new to me) the network acts very similar to wifi but with a much greater range. IoT devices connect and send data but I believe they first need to send a connect signal although the network is always ¡°listening¡±.
I have a LoRa gateway which is periodically challenged by other gateways to confirm its existence so the point is to find the best position for the antenna to pick up coverage from other gateways.
|
> Something may have been missed in this discussion, if so,
apologies.
> To help, we have to know the source of the signal being
sought. If it is a dead carrier, very well. However, if it is a
chirp from a device, then it will not be seen.
> In the latter case, the level will be very low and the
energy will be spread across the chirp; those are, after all, the
whole idea of the protocol. In addition, of course, even if the
signal were detected, it would be very brief indeed so it would be
most unlikely to encounter a sweep that moves, in data
communication terms, at a glacial pace. We are to note, too, that
even if something were to be seen, then it would just look like a
tiny flicker in amongst the rest of the "grass".
> Again, apologies if all that has been considered.
> John
> at radio station VE7AOV.
+++++
On 2022-04-25 11:26, W0LEV wrote:
toggle quoted message
Show quoted text
Yes,
that is what is being said.? If the signal is below the noise
floor, you will be unable to detect the signal.? Spectrum
analyzers in general, including some expensive units,
typically exhibit a noise figure around 15 to 20 dB.? The more
modern SAs include an internal preamp to rectify this
situation.? If you have a low noise preamp, install it between
the antenna and the input to the SA.?
Dave -
W?LEV
Thanks Erik, I¡¯ve tried three different antennas with the
same result. This is what I¡¯m seeing:
When you say input noise floor, are you saying the signal
may just not be strong enough to pick up?
thanks
--
Dave - W?LEV
Just
Let Darwin Work
_
|
Yes, that is what is being said.? If the signal is below the noise floor, you will be unable to detect the signal.? Spectrum analyzers in general, including some expensive units, typically exhibit a noise figure around 15 to 20 dB.? The more modern SAs include an internal preamp to rectify this situation.? If you have a low noise preamp, install it between the antenna and the input to the SA.?
Dave - W?LEV
Thanks Erik, I¡¯ve tried three different antennas with the same result. This is what I¡¯m seeing:
When you say input noise floor, are you saying the signal may just not be strong enough to pick up?
thanks
-- Dave - W?LEV
Just Let Darwin Work
|
Thanks Erik, I¡¯ve tried three different antennas with the same result. This is what I¡¯m seeing:
When you say input noise floor, are you saying the signal may just not be strong enough to pick up?
thanks
|
Suggest to disconnect and reconnect the antenna. If nothing changes you may be only seeing noise and no signal
Remember the tinySA is not a receiver so the input noise floor is higher then a receiver --
For more info on the tinySA go to https://tinysa.org/wiki
|
Is the signal still there is you completely remove the antenna?? If so, it may be a spur generated by the TinySA circuitry.?
Dave - W?LEV
Hi,
Just bought my tinysa so please excuse the basic questions or if I'm fundamentally misunderstanding something.
I'm trying to find the best position indoors for a alora antenna (868Mhz) as I have no option to mount it outside. I'm using the tinysa to gauge signal strength, I've?
- Attached a specific lora antenna
- Set mode to HIGH IN
- Set frequency to center 868Mhz
However, regardless of where I am, either outdoor or indoors the signal is always around 101-102dBm, even if I put it inside a washing machine which I would expect to at least partially kill the signal.
Am I using it wrong?
Thanks
-- Dave - W?LEV
Just Let Darwin Work
|
Hi,
Just bought my tinysa so please excuse the basic questions or if I'm fundamentally misunderstanding something.
I'm trying to find the best position indoors for a alora antenna (868Mhz) as I have no option to mount it outside. I'm using the tinysa to gauge signal strength, I've?
- Attached a specific lora antenna
- Set mode to HIGH IN
- Set frequency to center 868Mhz
However, regardless of where I am, either outdoor or indoors the signal is always around 101-102dBm, even if I put it inside a washing machine which I would expect to at least partially kill the signal.
Am I using it wrong?
Thanks
|
Hi,
Just bought my tinysa so please excuse the basic questions or if I'm fundamentally misunderstanding something.
I'm trying to find the best position indoors for a alora antenna (868Mhz) as I have no option to mount it outside. I'm using the tinysa to gauge signal strength, I've?
- Attached a specific lora antenna
- Set mode to HIGH IN
- Set frequency to center 868Mhz
However, regardless of where I am, either outdoor or indoors the signal is always around 101-102dBm, even if I put it inside a washing machine which I would expect to at least partially kill the signal.
Am I using it wrong?
Thanks
|
If Erik was to create a kickstarter or some such, for a TinySA with a larger screen and some of the other most requested features, I would immediately support it. I greatly appreciate the (thankless) work done by any project maintainer, and where possible I will support them. I feel I am not alone in this either.
/ Gerry
|
Can you connect to the tinySA serial over USB using a terminal emulator and issue the command leveloffset and post the generated output? --
For more info on the tinySA go to https://tinysa.org/wiki/
|
I repeated the test with both cables with the same result... Martin
On Sat, Apr 23, 2022 at 1:57 PM Erik Kaashoek < erik@...> wrote: Can you try calibration and self test with both cables?
Seems the calibration level is wrong
--
For more info on the tinySA go to
|
Can you try calibration and self test with both cables? Seems the calibration level is wrong --
For more info on the tinySA go to https://tinysa.org/wiki/
|
I received?two tiny SAs Both are failing the self-test. Attached are photos. Are they fixable? Thanks Martin ?
-- Martin Grillo EMT-P,CIC, EMC COM T / RADO / AUXCOMM W1EMR / Amateur Extra?PGGB063396 / GROL/R 8 EMS - 37 PAPD - 23 NYPD - 343 FDNY
Never forget our Brother & Sister Heroes 9/11/01.
It was not how they died that made them heroes.....
It was how they lived! ?
Emergency Medical Rescue of New York City's?25th Anniversary 1995 - 2020
Website??-?Telephone 718 474 0680 -?Email:?info@...
Please Support Us .... Thanks!
? ? ? ? ? ? ? ? ? ? ? ? ??
|
Re: Expert menu freq/level correction also applies to OUTPUT mode?
Upon checking again the 10MHz output it still showing the exact same error of -27Hz, but the error on 150MHz output dropped to only 67Hz, which would be now quite workable for NFM testing.
The modulation is 8 bit, the unit is NOT an 'NFM testing' device. How do you propose to control modulation and deviation ? Wrong tool for the job.
|
The missing "S" is already known (and fixed in the git repo):
As for the original bug report in this thread, the one related to markers, I assume it is some sort of integer overflow problem because 2^32-1 = UINT32_MAX = 4'294'967'295 ¡Ö 4.29 G.
|
Rudi, I can't find the missing 'S', please help me..... --
For more info on the tinySA go to https://tinysa.org/wiki/
|
Re: Expert menu freq/level correction also applies to OUTPUT mode?
On Mon, Apr 18, 2022 at 04:57 AM, <tinysa-iogroup@...> wrote:
Or why is the 10MHz output still showing the same frequency error? Perhaps I did something wrong or are these results within expectations?
See wiki entry,? last line:?https://tinysa.org/wiki/pmwiki.php?n=Main.SETTINGS3 ? --
For more info on the tinySA go to https://tinysa.org/wiki/
|
Re: Expert menu freq/level correction also applies to OUTPUT mode?
Frequency correction done: measured LO Output at 10MHz and it was found to be off by -27Hz, or 9.999.973MHz.
And just to also have a reference at a higher? frequency, measured output at 150MHz, and it read -0.39K, or 149.999.610MHz.
Frequencies above measured on calibrated service monitor that directly reads and displays the frequency error of the input signal.
Then entered 9.999.973MHz at the frequency correction section in the expert menu.
Upon checking again the 10MHz output it still showing the exact same error of -27Hz, but the error on 150MHz output dropped to only 67Hz, which would be now quite workable for NFM testing.
So something was definitively compensated for. But I am assuming the frequency step resolution is not fine enough for the compensation to clearly show up on much lower frequencies? Or why is the 10MHz output still showing the same frequency error? Perhaps I did something wrong or are these results within expectations? Thank you.
|
Re: Expert menu freq/level correction also applies to OUTPUT mode?
I would also like to suggest that you change the default audio modulation frequency at least for NFM mode from the present 5KHz to 1KHz. That would also save an extra generator setup step.
Besides nobody would even be able to use 5K in NFM as the radio receiver discriminator limits the audio response to voice bandwidth which is 300Hz to 3KHz.
This is also true for any other 2-way radio using any other modulation mode be it AM, SSB, DATA, etc. Perhaps on WFM where audio bandwidth extends to 15KHz, a 5K tone might be used at times, but I doubt it would really be of much use at least as a default frequency.
And as I mentioned in my initial post, in NFM mode the modulation tone is currently pushing 5Khz carrier deviation which is equivalent to 100% modulation. But if deviation could be lowered to 3KHz deviation which is 60% modulation, it would be much more useful. In short a 1KHz modulation test tone with 3KHz carrier deviation is the universal test standard used for NFM modulation on 25KHz bandwidth channels. Its half that on narrowband 12.5KHz channels.
Thank you.
|
