•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe™

Sitemap

HF transmitter for wireless joystick - RF Cafe Forums

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 that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

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 
 
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?






Posted  11/12/2012
Custom Search
More than 10,000 searchable pages indexed.

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website