transmitter- receiver

[parthshah08]

can somebody provide circuit diagram for 180 khz transmitter - receiver circuits

 

[audioguru]

That is a very low radio frequency. It is almost an ultrasonic frequency. Then its antennas will need to be extremely long.
Have you seen the huge antenna for an AM radio station that has a frequency that is 3 times to 9 times higher?

 

[parthshah08]

ohhhh...that sounds i'm screwed.. actually i'm new to this field...i was jus asked to make 180khz receiver circuit from my college..

 

[parthshah08]

it will be fine if the range is low...

 

[audioguru]

Weren't you taught about super-heterodyne radio circuits?
But for low range then a simple crystal radio child's toy circuit will work.
Where will you find a radio transmitter with the very unusually low frequency of only 180kHz?

 

[Reloadron]

Why 180 kHz Frequency?
The V6, operating at 180kHz, is designed to
work well in both fresh and salt water. Choosing
this frequency enabled VEMCO to develop
a small, lightweight tag that would still operate
well in marine environments. Tags with operating
frequencies greater than 200 kHz are less
effective in salt water. Depending on the conditions
of your location the V6 can have up to 200
metres range. The V6 is also the first in a series
of even smaller and lighter transmitters.

Apparently the frequency is popular with fish? Check this link out. Company is located in Canada (of course).

A Google of 180 KHz transmitters receivers actually brings up some hits.

parthshah08

ohhhh...that sounds i'm screwed.. actually i'm new to this field...i was jus asked to make 180khz receiver circuit from my college..

Did they mention why? Anything at all?

For some reason 180 KHz in ultrasonics is popular.

Ron

 

[parthshah08]

i think they just told one thing: "Your circuit should show the output on oscilloscope"

 

[parthshah08]

thanx...i'll try to google crystal radio circuits

 

[parthshah08]

will this work on 180 khz. what should i change from default given values?

 

[Reloadron]

What you have there is a basic crystal radio receiver. That should tune between about 561 KHz and 3.3 MHz as it is drawn I think. The frequency range is determined by the coil (220 uH) and the variable capacitor 10 to 365 pF. The formula is attached. I also suggest you read this page with a focus on parallel RC networks.

Remember this is a very basic crystal radio receiver you posted. Also suggest you start understanding antenna length as was mentioned.

What exactly are you trying to do?

Ron

 

[parthshah08]

I'm trying to make a 180 khz receiver circuit. Oh and thanks for that wiki information.I did calculate keeping inductor same. I think i need capacitor of around 3.55 pf