V7 VHF FM Transmitter by 2N3866

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The circuit is identical to the V7 VHF FM Transmitter but with a few small additions. TR1 (BC547) is an inverted Hartley oscillator which based upon an inductor fabricated on the PCB. This makes it megga-stable, and setable anywhere in the VHF FM band (76MHz to 119MHz) and the BB105 varicap makes it voltage tuneable over about 8MHz of that band. The inductor has one tapping for feedback and a second to feed an optional prescaler. TR2 is a buffer/amplifier and TR3 it the PA stage.

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http://www.next.gr/rf/fm-transmitters/index3.html
Thank you.

This entry was posted on Tuesday, January 22nd, 2008 at 9:48 am and is filed under RF-Radio Frequency, fm transmitter. You can follow any responses to this entry through the RSS 2.0 feed.