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Old Sep 15, 2005, 02:35 AM
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Joined Jun 2004
49 Posts
making a signal booster

hi all
I am thinking of making a signal boaster for my FM transmitter (for audio purposes, not related to r/c)

currently my fm transmitter signal transmission is very weak and there are a lot of distortions on the receiver side.

Is it possible to just do a simple add-on amplifier circuit (comprises of a op-amp, maybe) on the end of the antenna wire? or the whole transmitter circuitry needs to be redesigned?
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Old Sep 15, 2005, 04:25 AM
Registered User
Auckland, New Zealand
Joined Apr 2002
816 Posts
cheeyw... correct, the whole thing needs to be redesigned, and be aware, though i think you know... modification of the RF circuitry of any RC transmitter without a HAM license is illegal in most of the world
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Old Sep 15, 2005, 12:01 PM
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Joined Jun 2004
49 Posts
yes i know that. i am just curious. I bought a diy fm transmitter kit from a hobbylist shop and found that it cannot work up its specifications.
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Old Sep 16, 2005, 12:50 AM
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Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,058 Posts
Just add an RF amplifier before the antenna.

Here's an example with two RF Amp stages:-

4 Watt FM Transmitter

Or if 4W isn't enough, try this:-

40W broadband VHF RF Power Amplifier for FM broadcast
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