Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
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Below are all of the forum threads, including all
the responses to the original posts.
Post subject: HF transmitter for wireless joystick
Posted: Sun Mar 05, 2006 1:53 pm
Joined: Tue Dec 27, 2005 1:51 pm
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?