Booster Antenna Circuit 550Khz to 1650Khz


Posted on Feb 5, 2014

Here is abooster antennacircuit for 550Khz to 1650Khz. to amplify the input from a telescopic antenna. cover the medium waveband from about 550Khz to 1650Khz. To drive low impedance (50 ohm) receivers, the medium output impedance of the BF981 stage is enhanced by the composite amplifier made from Q2 and Q3. Q2 is operating in common emitter boosti


Booster Antenna Circuit 550Khz to 1650Khz
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ng voltage levels by just over 2, Q3 is operating in emitter follower providing thebooster antennacircuit with low output impedance. RV1 is the gain control allowing weak signals to be amplified or strong signals to be attenuated. The control voltagebooster antennais applied to gate 2 of TR1, a dual-gate MOSFET, the signal voltage applied via gate 1; the input signal being double tuned via the 330uH coil and the two KV1235 varicap diodes at the MOSFET`s input and by the same components at the BF981 MOSFET`s drain terminal. Both tuned circuits provide high selectivity across the entire tuning range. To aid stability the MOSFET stage is fed from a 6. 2V zener stabilized supply. Finally this active booster antenna can be used on other bands by changing the values of the 330uH coils. Here is a schematic booster antenna circuit: We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon.




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