Aircraft interferences

[giuhalftrack]

Hi, I'm experiencing interference from aircraft flying over me, I'm having this with two tesoro machines, the compadre and the outlaw...

I think we take the interference from the coil (I think is the most sensitive part) and not think the interference strike on the PCB directly (in a measurable way)..

what left me thinking is: what frequency (or harmonic) is causing the trouble ?

[ivconic]

The aviation VHF communication band ranges from 118.000 MHz to 136.995 MHz.
The "standard" spacing used to be 25KHz or 0.025 MHz between each channel.
Today, very cheap Baofeng handheld radios have the ability to receive such communications.
I have 4-5 models, some are duobanders and some are tribanders.
In your case, it is recommended to get a cheap SDR USB dongle and install SDR# (SDR Sharp) open source software.
You have some kind of "spectrum analyzer" in the software and you can easily "hunt" the source of those interferences that bother you.

[giuhalftrack]

The aviation VHF communication band ranges from 118.000 MHz to 136.995 MHz.
The "standard" spacing used to be 25KHz or 0.025 MHz between each channel.
Today, very cheap Baofeng handheld radios have the ability to receive such communications.
I have 4-5 models, some are duobanders and some are tribanders.
In your case, it is recommended to get a cheap SDR USB dongle and install SDR# (SDR Sharp) open source software.
You have some kind of "spectrum analyzer" in the software and you can easily "hunt" the source of those interferences that bother you.

interesting !!! I was planning to buy a SDR USB for other expriments and may be the time is come.

[ivconic]

SDR# is probably the most interesting software I've been playing with for long time.
Any "dongle" will do.

[giuhalftrack]

SDR# is probably the most interesting software I've been playing with for long time.
Any "dongle" will do.

can you suggest a particular device ?

[ivconic]

[ivconic]

https://vi.aliexpress.com/item/10050...Cquery_from%3A

[ivconic]

I also have these 3 (I had a dozen of various modes, people come and take them... but don't remember to return them). All 3 have the possibility of receiving Airband.

[Melbeta]

Hi, I'm experiencing interference from aircraft flying over me, I'm having this with two tesoro machines, the compadre and the outlaw...

I think we take the interference from the coil (I think is the most sensitive part) and not think the interference strike on the PCB directly (in a measurable way)..

what left me thinking is: what frequency (or harmonic) is causing the trouble ?

I use an old dial up system, I live in a forest of trees, so have only an incoming vintage phone line coming into my house. So am limited very much.

Now the COIL has the antenna for the metal detector, that is what I understand, but the PCBs can experience SIGNALS "leaking" into the PCB parts.

Now I do not know, or even think, airplanes flying over you area, is the cause. What is the solution? I do not think I know. You are there, i am here. So it is guess work you see. Now guys like Carl Moreland, and others in the forum, are engineers, and I am not an engineer.

I have not had any problems like you are having, so all I can say is perhaps some nearby person, has an RADIO SYSTEM, and he is beaming out of his house, very very strong signals.

Now as a child, we used TUBE radios, and the signals coming into our house, were long distance signals, there was no LOCAL locations near our house, so they were weak signals into the house. We did not use any antenna other then the RADIO's antenna in its radio case, so we got a high amount of audio static coming into the house back then.

Since your problem is coming from TWO TESOROS, take them far away from your house, and run them there, if it is still there, its the machines. If it goes away, it is your location that is the problem area. It is guess work for me, and that is all I can guess you see...Since two are the problem, it is either (1) the Tesoros themselves, or (2) the LOCATION you are using them in... That is my guess!
MELBETA

[Melbeta]

can you suggest a particular device ?

I have a bunch of FLASH DRIVES, similiar in looks like the photo of your flash drives. I have NO PROBLEM with ANY of my flash drives.I do not think it is the flash drives them selves...... I also use CD disks, and also use DVD disks and so far, NONE of them have given me any problems......... The only suggestion I can make is TEST IN OTHER LOCATIONS farther away from your PROMBLEM AREA!!!!!!!!
Melbeta

[Melbeta]

https://vi.aliexpress.com/item/10050...Cquery_from%3A

I have no experience with AliExpress.Com, is it naked girls website???????? Other then that, I have no ideas. Are you using a WIRE around your house for the ANTENNA??????? Those bring in LOTS of problems from my past experience............
MELBETA

[Melbeta]

The aviation VHF communication band ranges from 118.000 MHz to 136.995 MHz.
The "standard" spacing used to be 25KHz or 0.025 MHz between each channel.
Today, very cheap Baofeng handheld radios have the ability to receive such communications.
I have 4-5 models, some are duobanders and some are tribanders.
In your case, it is recommended to get a cheap SDR USB dongle and install SDR# (SDR Sharp) open source software.
You have some kind of "spectrum analyzer" in the software and you can easily "hunt" the source of those interferences that bother you.

There is MY GUESS!!!!!!!!!! VERY HIGH AVIATION (VHF) communmication bands, is reaching out WAY OUT, picking up LEAKING signals.....
IVCONIC is right!!!!! I think DONGLES will ground those incoming signals, but will not get rid of them...... I have no experience with Spectrum analyzers, but heard of them, they are used to find incoming signals you
do not know about. I will guess the PROBLEM is from the system you are using.............Not from the TESOROS themselves, and that is where you have to look for answers...
MELBETA

[giuhalftrack]

...Since your problem is coming from TWO TESOROS, take them far away from your house, and run them there....
MELBETA

the machine never make noise neither in the Alps or in the mediterranean Beach...

I experience problems in an area that it is below the descending path for the MXP (Milan Malpensa) airport... and only when planes are above me or approaching...

[Melbeta]

the machine never make noise neither in the Alps or in the mediterranean Beach...

I experience problems in an area that it is below the descending path for the MXP (Milan Malpensa) airport... and only when planes are above me or approaching...

I do not know what is going on in your Tesoro metal detectors. Never had any Tesoro machines ever in my hands. It kind of sounds to me more like there is a mechanical defect within the two Tesoro
metal detectors. Older metal detectors, especially ones that came from a company that went out of business years ago might be slightly defective in some parts and not running at full capacity.
Since you do not have problems in the Alps or in the Mediterranean Beach areas, it sounds to me more like there is some abnormality in the area of the Milan
Airport that is affecting both of your Tesoro metal detectors. If some parts have slightly failed in performance you could be having problems there as well... Definitely a frequency invading your two
metal detectors and overwhelming the performance. But I am not an expert on electronics performance.......
MELBETA

[Raccoon12]

I experience problems in an area that it is below the descending path for the MXP (Milan Malpensa) airport... and only when planes are above me or approaching...

Wellll, it's somewhat weird, properly designed MD should not have problems with airports and planes in absolute majority of sensible situations. Maybe, just maybe you are picking up ILS (instrumental landing system) beacons, or airport's obsolete non-directional beacons. The latter may be on rather low frequencies in LW/MW bands.