Novice description of RF vs Electrical waves

[keithb1234]

Is there a simple explanation of the difference between RF waves, WiFi Signals, Bluetooth signals, electrical pulses, etc. In other words what is the difference if i create a wave by pulsing an electrical connection 50 times per second (50 hz), vs creating a 50hz sound wave. I need to create a 33Mhz RF signal and was wondering what is the difference between a 33Mhz RF signal and a 33Mhz tone generated from a computer/device?

Hopefully that makes sense.

 

[volker@muehlhaus]

It seems that you look for a signal generator with amplitude modulation (AM) capability. Something like the Siglent SDG830 will do the job, you only need to add an RF amplifier.

​

 

[D.A.(Tony)Stewart]

You wrote 1.6MHz modulated 3.2MHz which later missed a decimal point as 16 MHz which is possible. But none of this is scientific.
What does make sense is to use fast risetime currents which are the same as the slopes of RF sine waves and then pulsed at some rate that is detectable by the physiology.

TENS devices do this for healing human sprains for about $50 in drugstores. But you may need to use a higher power to span a few plants.

--- Updated May 30, 2024 ---

You wrote 1.6MHz modulated 3.2MHz which later missed a decimal point as 16 MHz which is possible. But none of this is scientific.
What does make sense is to use fast risetime currents which are the same as the slopes of RF sine waves and then pulsed at some rate that is detectable by the physiology.

TENS devices do this for healing human sprains for about $50 in drugstores. But you may need to use a higher power to span a few plants.

These will span a very wide bandwidth up to but not including the frequency that corresponds to the slope of the pulse as the return slope cancels out, but then above this lower levels of harmonics occur. Somewhat like repetitious lightning pulses that can be heard on all AM band channels but repeating to the pulse rate like a buzz or whatever you find most irritating to these slugs. TENS also offers these variations, sweeping faster and slower which can be quite irritating if strong but apparently therapeutic to circulate plasma.

 

[KlausST]

Hi,

The goal is to try and replicate the device.

So the key goal is to kill nematodes.

especially when they say that a cheap, effective alternative is not good.

You say "effective" method. If it is effective then there already is a proof that it killed nematodes.
I´m just curious: On what physical/biological effect does your modulated MHz signal work to kill them?

I have no experience with nematodes.
From an amateur perspective in this topic ... I think there needs to be some current flow (causing heat) in the nematodes to kill them or to use any "nematode inside" resonance to cause heat (similar to a microwave oven) to kill them.
If not heat ... what other way do you see to kill them? Frequency does not kill. There always needs to be some energy/power.

In both cases the nematod needs to differ from any other protein so that your signal is able to focus on just the nematodes. Either in electrical conductivity or resonance..

Klaus

 

[biff44]

is the question if you have something that pulses at a 33 mhz rate (i.e. ON, then OFF for the total period of 1/33 MHz time), does it look like a 33 mhz rf signal?

sure. but it also has 66 MHz, and 99 MHz content, the later of which will be very high amplitude level. this makes it kind of hard to use it for anything serious. the FCC does not want those harmonics being broadcast in a comm system, for instance.