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HF transmitter for wireless joystick - RF Cafe Forums
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| Whitebird
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Post subject: HF transmitter for wireless joystick
Posted: Sun Mar 05, 2006 1:53 pm
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Joined: Tue Dec 27, 2005
1:51 pm
Posts: 8 |
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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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Posted 11/12/2012
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