Re: 150Khz Antenna question

On Jul 2, 9:29 am, "Jacques St-Pierre" <multe...@[EMAIL PROTECTED]
>
wrote:
> Anyone can help me with the design of a compact 150Khz antenna?
>
> Let me explain the goal, I need a way to induce a 150Khz signal to a
> compound for an experiment.
>
> I will build a supply using a LM555 at 13.8Vdc and a transformer to
produc=
e
> a 150Khz square wave of 140Vp-p approx.
>
> I need to couple that 150Khz signal to a sort of compact antenna to
> emit/induce the wave to the compound. The coil should be compact enough
to=

> be insert in a plastic case of 2" x 4" inches.
>
> What is the best length of wire to use? What is the best way to wound
it?
>
> Any suggestions?
>
> Jacques
>
> --
> Jacques St-Pierre
> Pr=E9sident Directeur G=E9n=E9ral / Chief Executive Officer
> MULTI-=C9LECTRONIQUE (MTE) INC.www.multi-electronique.com
> T=E9l. : (418) 724-5835

I designed a circuit like you describe for 125 kHz. I used a Kaschke
magnetics ferrite custom coil which was designed to manage a large
magnetic field (large diameter). The application was Tire pressure
monitor calibration, with a requirement of a 10A/meter field at 10
inches. Do you have a specification for your magnetic field strength?

These types of antennas are very narrow bandwidth. The most efficient
way to build this system is to use a power oscillator at 150 kHz with
the antenna as part of the resonant circuit. What is your frequency
tolerance?

Frank