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Author Topic: Boosting FM Transmitter Signal?  (Read 1708 times)

Skylined

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Boosting FM Transmitter Signal?
« on: November 05, 2006, 08:04:10 PM »

I have a FM transmitter, like an iTrip.

This is the FM transmitter IC that it has http://gain-tech.com/contents/product/GFT808.pdf

I've seen that on the circuit board, pin 8 (RF Out) goes to a very tiny capacitor, and then goes to the 3.5mm's ground.
So I guess that the cable that goes to the MP3 player, is the antena.

I need to boost that signal, so I was thinking about making a home-made antena, but I don't know if this is the best idea, nor how to do it.

Should I break the trace that goes to ground and wire the antena there?
« Last Edit: November 05, 2006, 08:07:34 PM by Skylined »
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linear

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Re: Boosting FM Transmitter Signal?
« Reply #1 on: November 06, 2006, 12:02:07 PM »

Yeah, I'd try a simple quarter-wave antenna made out of copper wire as the first attempt.

If I figure it right, a quarter-wave is 843mm at 89 MHz. Divide c by your frequency to figure it for other values.
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Skylined

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Re: Boosting FM Transmitter Signal?
« Reply #2 on: November 07, 2006, 10:56:49 PM »

Thanks for the tip. ;)
I've tested it today at the theatre and I got a very good boost. :)
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