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adjustable 1 watt FM transmitter?

 
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adjustable 1 watt FM transmitter?
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bob
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Joined: 24 May 2004
Posts: 3

Post adjustable 1 watt FM transmitter? Reply with quote
Hi
I've built a 1 watt (fixed) FM transmitter that I would like to modify for adjustable power output. (I want to LOWER the RF power output, crazy I know!)
This circuit design utilizes two transistors, the second feeding power to the antenna.
I'm guessing, if I limit the supply voltage to the power transistor, it would reduce the output of the transmitter. Can anyone comment?
I don't want to limit the voltage for the entire circuit because of the PLL circuitry.
Thanks for your help!
Bob
Mon May 24, 2004 11:40 pm View user's profile Send private message
bob
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Joined: 24 May 2004
Posts: 3

Post Reply with quote
I designed a solution and it seems to be working well.
I added an adjustable voltage regulator just before the ferrite bead and rf choke on the supply for the last power transitor. Running at a fraction of the power runs alot cooler and uses less power. nice!
Mon May 31, 2004 1:07 am View user's profile Send private message
rich.freeman
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Joined: 05 Jun 2004
Posts: 2

Post Hi Bob, Reply with quote
Could you send me details of the circuit you are talking about,
I am interested in making a similar circuit to send stereo analogue sound from mp3 player to car radio? if this is possible.

Thanks in advance.
Sat Jun 05, 2004 1:09 pm View user's profile Send private message
Black_Hawk
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Joined: 15 Mar 2004
Posts: 112
Location: Entering The Flags...but simply an arm wielding a sword signifying power

Post PERSONALLY I WOULD NOT WASTE Reply with quote
YOUR TIME AND EFFORT..YOUR SCHEMATIC IS FULL OF ERRORS

Respects..Norm B
Sat Jun 05, 2004 5:53 pm View user's profile Send private message
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