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HF Transmitter for Wireless Joystick - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Whitebird
 Post subject: HF transmitter for wireless joystick
Posted: Sun Mar 05, 2006 1:53 pm 
 
Captain

Joined: Tue Dec 27, 2005 1:51 pm
Posts: 8
Hi,

I am building an HF transmitter for a wireless joystick. The carrier frequency is 43 MHz. The problem is that transmitter and antenna have to fit inside the joystick case which has the following dimensions:

-the box is 8.3*8.8cm
-the stick is 10cm heigh

Because of those small dimensions it is not possible to fit a quarter wave length antenna inside (at 43MHz, wave length/4 = 1.8m). And a 10cm wire is not long enough to provide sufficient range even if coil tuned because of very poor efficiency.

The output amplitude of the carrier is 1V peak to peak.

So what should I do to get sufficient range (I need just 10 meters)?

The only way is to go to higher frequencies?






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