If I have a humminbird sonar fish finder operating on 115 kHz / 0.115mhz .

I'm looking to expose the antenna on both reciever and transmitter .

Now my problem is how would I calculate the correct length of antenna on each device to get maximum range of reception ?

Is there anyone out there who could calculate the math on this or simplify how it's done accurately please ?

Any help with this would be great fully recieved as its burning my head out .

Jay​

 

http://www.radio-electronics.com/info/antennas/dipole/length-calculation-formula.php

 

Thank you dl324 I'm still abit confused by it I'm obviously missing something ?

Jay

 

An ultrasonic audio wave is not the same as a radio wave.

 

I'm confused by it all tbh br-549 . Wish I hadn't attempted the conversion .

I have converted both devices and exposed the antennas but I seem to of shortened the range rather than extending it

 

I am by no means an ultrasonic expert. An ultrasonic transducer (not a true antenna) is sorta like a speaker/microphone combination.

Only instead of creating pressure waves in air.......it produces pressure waves in water.

Sonar is just a high frequency audio transmitter and receiver.

Study sonar and ultrasonic transducers.

 

I'm guessing that ultrasonic sensors improve with increased area. Not sure about ultrasonic transmitters. Beyond the shadow of a doubt they are in no way related to radiowaves. If they were, the half-wave dipole length would be approximately 1300 Meters from end to end. Clearly an impractical system for your purposes.

 

I'm guessing that ultrasonic sensors improve with increased area. Not sure about ultrasonic transmitters. Beyond the shadow of a doubt they are in no way related to radiowaves. If they were, the half-wave dipole length would be approximately 1300 Meters from end to end. Clearly an impractical system for your purposes.

Yes papabravo

Ideally it would be a wireless system I think a 1300 meter antenna wouldn't be practicle .

 

I believe the quality systems use arrays for both transmission and receiving.
Just like radar.

 

An ultrasonic audio wave is not the same as a radio wave.

Why? IIRC, the Navy towed an antenna miles long behind submarines for some very low frequency application.

 

That's true. But I recall that was a radio antenna.....for around 10 khz or so. Very low rf frequency so to go thru the earth.

It wasn't for ultrasonics or for sonar.




Edit.....If I remember right, the receiving antenna for that setup was buried underground in Minnesota, 11 miles long.

 

I take it it isn't as simple as getting the correct length antenna to receive further range on the system them ?

Sounds complicated all this .

 

But I recall that was a radio antenna.....

Waves are waves; they just vary in length...

for around 10 khz or so. Very low rf frequency so to go thru the earth.

The frequency was more like 70-300 Hz. They also had planes flying over the oceans trailing miles long antennas to communicate with submarines.

 

No sir. Waves are not waves.

Two waves. A matter wave, or gravity wave (sound, water, earthquake) and a radio (electric and magnetic) wave.

Different waves for different mediums. Media displacement vs electrical field displacement.

 

Jason, I don't know your background but, if you are truly wanting to understand these things, it won't cost you much.

You can purchase small microprocessor prototype boards (arduino, avr, etc) and ultrasonic sensors. These are cheap and have plenty of free example software.

With a little study of the software program, you can see how the operation of the transducer is done. And how the received data is interpreted.

Then using and modifying the same setup........you may control a very high powered transducer. OR even arrays of transducers.

Don't kill or injure any wildlife.

 

I have just been shopping online to do that very thing.

See if I can't take over the world

 

No sir. Waves are not waves.

Somehow I knew you would carry it to an extreme.

You forgot to mention waves in water...

 

"extreme" shouldn't be used to describe a simple standard. Even though ANY standard is considered extreme today.

Oh...you forgot to read the word "water" in my post.

 

An ultrasonic audio wave is not the same as a radio wave.

Did you know the jury is still out on this? I worked with ELF quite a bit at HAARP, and one of the most intractible problems was determining if ELF/ULF transmissions were true far-field EM waves ore merely mutual inductance. The scale lengths are so great it's impossible to get valid measurements....i.e., to see if the field follows the inverse square law or not!

 

P.S. I presume the salient point is infrasonic radio wave...which is in the audio frequency range, but electrical.