See below

Using the antenna in a low power environment (mW), 10db is good. Use the device's LNA. Very helpful... For a direct connect you want to measure---for cleanest signals---something around a 10 MILLIONTH of a watt! If your mic puts out 100 mW, that would require 60db of attenuation?

yes, it would have been best to close (or rather delete) the topic from the very first post

Personally I always keep an attenuator connected, that's how I was taught, and it has saved me from mishaps on many occasions throughout my working career.

You don't often need the full sensitivity of a SA, so I tend to use a 20dB attenuator, but in your case where you are dealing with relatively low power devices I think a 10dB would be a reasonable compromise.

Regards,

Martin

Hello,

I'm a sound engineer not an RF engineer let's just start there.. Wondering if I should be always using an attenuator on the input of my TinySA Ultra to protect it or only if I observe a signal that's nearing 0dB? Will the TinySA warn you somehow of an overload?

A little background.. I'm using the TinySA to scan mostly VHF and UHF but sometimes 2.4GHz and 5GHz to help coordinate and troubleshoot our wireless mics and wireless video equipment. Generally the power levels we deal with are well under 1W but some video transmitters go higher... I am often wearing an active wireless mic myself (100mW transmitter) for coms purposes. Does operating the TinySA very close to the a transmitter like that run the risk of overloading or damaging it?

Can I connect the output of a transmitter directly to the tinySA with a piece of coax without an attenuator or is this bad for both devices?

Sorry for the basic questions. Just looking for some best practice basics. If I'm just going to buy one attenuator for this purpose what's a good value? 10/20/30 dB?

I apologize, Erik, I did not see your warning until reading past the posts to which I referred my latest replies.

Indeed there is some interesting effects as of late on the HF bands which one can see on a SpecAn.? Another amateur radio operator friend likened the solar storms to creating ripples in a pond when it bombards the ionosphere with radiation.? Listening to HF, one can visualize and correlate the effect keenly using that analogy.

The government may not want you to know, but this information is available online: we are subjected daily, for many hours, to a 1500 W/m^2 (yes, Watts with a capital W) source of mostly Terahertz and above frequencies.
It was also observed to emit radio waves in VLF to HF spectrum, a lot of ionizing radiation, bunch of charged particles and even neutrinos which pierce your body by the billions as we speak.
I attribute some of my eye and skin damage to it, confirmed by doctors. Talk about horrors.

So now we're claiming that exposure to sunlight causing cancer is a government coverup, an inert, massless, nearly unidetectable particle which has existed since long before humans walked the Earth is the cause of all ailments, and some nebulous "It" is nefariously bombarding us with non-ionizing radiation to cause us harm - all "confirmed" by a "professional" who is not an expert in such matters?

I would have to agree on one level; as we age, our eyesight and skin deteriorates - again, who'da thunk it?.? I simply must blame the aging process on a government coverup!

I really must invest in more stock in ALCOA.

This group has been one of my favorites!? And to think, had I not purchased a TinySA Ultra, I would never have been so enlightened!

Apparently the subliminal sarcasm font I used did not make it through the Groups.io interface. ;)

On Tue, Jun 4, 2024 at 05:10 AM, Jim Shorney wrote:

Some of these emissions can be observed with a TinySA.

Indeed, the Sun is quite 'volatile' at the moment, so it is a good opportunity to observe Solar radio bursts.

With a TinySA connected to simple wire dipole, approx 10ft / 3m per 'leg' and setup to sweep from 20 to 100MHz with the waterfall on, it should be possible to see occasional bursts, looking like swathes of broadband noise, lasting from just a few seconds to several minutes in duration.

Something like this recorded on my KiWi sdr, setup for reception of 20 to 60MHz




It is also possible to detect noise from Jupiter, but these are a bit more elusive.

Another project is to use a satellite dish and LNB connected to a TinySA in order to make celestial noise measurements.

There are many other radio astronomy projects that can be undertaken with a Tiny SA, but these are perhaps the easiest to start with.

Regards,

Martin

Some of these emissions can be observed with a TinySA.

On Mon, 03 Jun 2024 17:02:47 -0700
"vbifyz via groups.io" <3ym3ym@...> wrote:

The government may not want you to know, but this information is available online: we are subjected daily, for many hours, to a 1500 W/m^2 (yes, Watts with a capital W) source of mostly Terahertz and above frequencies.
It was also observed to emit radio waves in VLF to HF spectrum, a lot of ionizing radiation, bunch of charged particles and even neutrinos which pierce your body by the billions as we speak.
I attribute some of my eye and skin damage to it, confirmed by doctors. Talk about horrors.

73, Mike AF7KR

--

73

-Jim
NU0C

This topic runs the risk of being closed.
Please limit replies only to technical relevant content.
--

开云体育

Back to the NE-2 light saber. M-a-n-y years ago, working for GE, one of our super tech challenged some of us 'newbies' to the properties of the infamous ne-2 and the destructive power of a photo gun (flashlight). Kids, don't try this at home we are professionals, yeah, right.? Take said ne-2, in normal light, with appropriate resistor and run up a DC supply until the ne-2 just fires. Note the voltage, ACCURATELY. Now redo the run-up, only this time without the resistor AND (pay attention here) keep the ne-2 in total darkness setting the voltage a few milivolts higher than with the resistor. (If it explodes, you went too far) OK, all set. Now with the ne-2 under a protective cover and in the dark, shine a flashlight on the ne-2. The next sound is proof of the ionization of the photo gun (flashlight) True story, lots of fun. I still have my eyesight, hearing? not so good.

Mike C. Sand Mtn GA

?? ?

The government may not want you to know, but this information is available online: we are subjected daily, for many hours, to a 1500 W/m^2 (yes, Watts with a capital W) source of mostly Terahertz and above frequencies.
It was also observed to emit radio waves in VLF to HF spectrum, a lot of ionizing radiation, bunch of charged particles and even neutrinos which pierce your body by the billions as we speak.
I attribute some of my eye and skin damage to it, confirmed by doctors. Talk about horrors.

73, Mike AF7KR

On Mon, Jun 3, 2024 at 09:34 PM, Donald Kirk wrote:

your Safe and Sound Pro 2 is located much too close to the source (the TinySA) so the measured field values are most likely incorrect.

It is, and the values will be inaccurate as a result of the proximity, but if you convert the power density to something more understandable, you will see that it is still a fraction of practically nothing...

Hi Torito,

I just watched a video regarding the Safe and Sound Pro 2 instrument and it specifically says it’s intended for far field measurements which would make you believe it’s been calibrated when located in the far field relative to the source.

Based on your video your Safe and Sound Pro 2 is located much too close to the source (the TinySA) so the measured field values are most likely incorrect. ?You would need to make sure the unit is located in the far field for the measured field levels to be correct.

Just FYI,
Don wd8dsb

On Mon, Jun 3, 2024 at 09:54 PM, Martin wrote:

Fluorescents tend to work better, as they are physically a greater proportion of a wavelength.

Back in the day there were a few of us with 100w 2m band mobile
rigs in our cars sitting in a local with these lamps.

Keying the rigs would result in a light sabre effect and we messsed about with
pretend Star Wars fights much to the amusement of passers by / local cops.

Oh we had good fun back then.

73 de Andy

On Mon, Jun 3, 2024 at 08:28 PM, W0LEV wrote:

Maybe it would light an NE-2?

?

Certainly you know what those are??

Yes one of my earliest encounters with those small neons, was a ballroom ceiling with thousands of them wired up as simple oscillators, to create a twinkling effect.

https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

But to answer your main question, maybe, Maybe not...

I think you would have to extend the wires on it to stand a chance of it striking up.

Fluorescents tend to work better, as they are physically a greater proportion of a wavelength.

Regards,

Martin

On Mon, Jun 3, 2024 at 08:32 PM, daniel grafflin wrote:

could not even detect or affect em fields 500Mw per Cm/2

Err... Did you mean Mw or is that a typo ?