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This Fm rf power amplifier has 2 transistors from Philips : BLV 10 and BLW 87. The 2 rf transistors work in class C and this fm amplifier has a total gain of 21dB ( 100 X ) and efficiency 55 – 65%. One low pass filter with 9 components ensures 60dB rejection on the second harmonic. There is no need for tune-up to cover the whole 88 – 108 MHz FM frequencies.  RF Fm 88 108 MHz 20W amplifier Circuit Diagram

This is Fm transmitter circuit for house. It is modulation type Mono FM and Frequency range 88-108 MHz. By it have Working voltage range 12-18 VDC and use current max at 450mA only. This circuit convenient for , because , have good small-sized. It is the ideal project for the beginner who wishes to get started in the fascinating world of FM broadcasting and wants a good basic circuit. This circuit use the transistor the important , be the number is 2N3553.

This post is for an antenna loading coil telex broadcast on freq. let us buy Simply put wrote specifically for the antenna loading coil at the store component telex, because loading the settings is still for freq 2 meter, we must slightly modify it. The trick is easy, just replace the existing loops. original about 5 convolution convolution continues we replace 10 with 1 to 1.5 mm diameter wire. for more details see the pictures. may be useful ..