•  
  •  

Powerful AM transmitter

The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve corresponding variation in the value of inductor used in the tank circuit of oscillator connected at the collector of transistor T1.
The AF input for modulation is inserted in series with emitter of transistor T1 (and resistor R4) using a transistor radio type audio driver transformer as shown in the circuit. Modulated RF output is developed across the tank circuit which can be tuned to resonance frequency of the filter/resonator with the help of gang condenser C7. The next two stages formed using low-noise RF transistors BF495 are, in fact, connected in parallel for amplification of modulated signal coupled from collector of transistor T1 to bases of transistors T2 and T3. The combined output from collectors of T2 and T3 is fed to antenna via 100pF capacitor C4.
The circuit can be easily assembled on a general-purpose PCB. The range of the transmitter is expected to be one to two kilometers. The circuit requires regulated 9-volt power supply for its operation. Note: Dotted lined indicates additional connection if a 3-pin filter is used in place.

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like


HP Workstation Z420 Tower PC Intel Xeon 3.60GHz 4GB 120GB SSD  Windows 10 Pro picture

HP Workstation Z420 Tower PC Intel Xeon 3.60GHz 4GB 120GB SSD Windows 10 Pro

$466.39



Processor Tray LGA2011 for Intel Xeon E5 E7 E3 CPU - Lot of 2 6 12 30 & 50 - New picture

Processor Tray LGA2011 for Intel Xeon E5 E7 E3 CPU - Lot of 2 6 12 30 & 50 - New

$209.85



Xeon E5 E7 Processor Packaging for Tray LGA2011  52.5 x 45 mm - Lot of 2 6 12 30 picture

Xeon E5 E7 Processor Packaging for Tray LGA2011 52.5 x 45 mm - Lot of 2 6 12 30

$208.85



100 - Processor Packaging Case for LGA2011 v2 v3 v4 Xeon CPU + Anti Static Foam picture

100 - Processor Packaging Case for LGA2011 v2 v3 v4 Xeon CPU + Anti Static Foam

$98.88



Xeon Socket LGA2066 Processor Tray for W2100 & W2200 CPU's Lot of 2 6 12 30 & 50 picture

Xeon Socket LGA2066 Processor Tray for W2100 & W2200 CPU's Lot of 2 6 12 30 & 50

$14.85



100 - Processor Shipping Packaging Case for LGA1366 Xeon with Anti Static Foam  picture

100 - Processor Shipping Packaging Case for LGA1366 Xeon with Anti Static Foam

$98.88



VA Xeon Lamp ~ X6321 picture

VA Xeon Lamp ~ X6321

$249.95



Trenton 92-006053-XXX Single Board Computer With 2GB RAM Untested Parts Repair picture

Trenton 92-006053-XXX Single Board Computer With 2GB RAM Untested Parts Repair

$153.59



HP 460838-003 591182-001 System Board w/ 2pcs Intel Xeon W5580 3.2GHz CPU picture

HP 460838-003 591182-001 System Board w/ 2pcs Intel Xeon W5580 3.2GHz CPU

$43.50



INTEL S5000PSL MULTI-CORE XEON SERVER BOARD picture

INTEL S5000PSL MULTI-CORE XEON SERVER BOARD

$99.99