Rf Transmitters | Electronic Project Circuits

Posts Tagged ‘rf transmitters’

Valve Transmitter 7 watt 3.5-30 MHz

The oscillator is un-tuned so the only tuning procedure required is to select the band (coil tapping) and peak it for maximum RF output. The valves used were selected because they had B7G bases and were the first I put my hand on when I reached into my junk-box. Virtually any pentode valves will work in this application. An EL84, for example, will deliver over ten watts in this circuit but the valves quoted will deliver seven watts from 3.5 to 30 MHz. If you should use another tube then don’t forget to check the screen voltage. If it is less than 250v then you will need a resistor in the screen supply to the valve.

Read source: http://w1.859.telia.com/~u85920178/tx/2tubetx.htm

Be the first to comment - What do you think? Posted by admin - August 8, 2009 at 10:03 am

Categories: RF-Radio Frequency Tags: rf transmitters, tube rf transmitter

Single Channel RC Cars TX and RX

Simple RC Cars – Single channel Transmitters and Super Regenerative Receivers at 27MHz and 49MHz
Here is the 9 volt GS transmitter which does not use a crystal. This clever design allows only two transistors to generate both the carrier and and the modulation. Shown below at 27MHz 40MHz and 49MHz

Read More Source:http://www.members.shaw.ca/novotill/RcCarsSimple/index.htm

Be the first to comment - What do you think? Posted by admin - May 27, 2009 at 9:09 am

Categories: RF-Radio Frequency Tags: 49MHZ Remote control, RC cars, rf transmitters

V7 VHF FM Transmitter by 2N3866

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.

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