Hf Broadband Antenna Preamp Circuit


Posted on Dec 6, 2012

The HF/SW receiver preamplifier is comprised of a broadband toroidal transformer (LI-a and Ll-b), LC network (comprised of a 1600-kHz, high- pass filter-and a 32-MHz, low-pass filter), L2 and L3 (26 turns of #26 enameled wire wound on an Amidon Associates T-50-2, red, toroidal core), a pair of resistive attenuators (ATTN1 and ATTN2), and a MAR-x device.Shown here is the composition of a basic 1-dB pi-network resistor antenuator.


Hf Broadband Antenna Preamp Circuit
Click here to download the full size of the above Circuit.

This is the method of supplying dc power to a preamplifier using only the RF coax cable.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Over Voltage Protection
Time-Delay Auto-Kill Switch Circuit
Doorbell Memory
usb pow
Dual Axis Stepper Motor Controller
SINGLE CHIP DIGITAL VOLTMETER
LT4060 with temperature-controlled 2A NiMH battery charger
A watchdog circuit diagram



Top