jaya000

Visit here to see more FM transmitters. http://www.electronics-diy.com/downloads_pdf.php?s=fm_transmitters Hope this helps!

Surprised to c that there is no reply. There is another posting regarding FM transmitter. This can be also a small transmitter if designed for FM then connected with suitable antenna with little circuit modification.

I hv this VHF preamp. I want to modify so that it can be used for FM 88-108Mhz. I want to change the input output filter. But i want to study the circuit first. Hence i hv downloaded & atttached .s2p files of the devices used. But they just start from 100Mhz. I want to know how the designer has designed circuit & calculated input output impedance? On this basis how he designed VHF filters for preamp 48-230Mhz with 28db gain? I hv just not calculated/tested the ferrite choke value. I hv collected even the datasheets of the devices used. If required i can post it here. I am newbie to RF, hence expecting experts here to put some light on the circuit used. preamp.rar

The wooden stand must be hollow. It must hv used as enclosure combined with the round cabinet around woofer. Also the other two speakers r mounted outside the cabinet so that they don't interfere with woofer. Also the angle of woofer is 90 degrees from mid high speakers. This is because the low frequency is directionless for ears. The combination of round tube around woofer & stand increases the total volume. this means big cabinet for woofer to get more low bass.