Ray Ring at Circuit Salad posts the design and construct of a easy, low present mini-whip antenna.
I made a decision to attempt utilizing a small broad band E subject kind antenna with my latest receiver design… the Mini SDR, and the outcomes have been gratifying. There many helpful articles describing the sort of antenna; so I received’t go into a lot element about the way it works. Roughly it features as a capacitive E subject probe and subsequently could be very delicate to EMI. Nonetheless, if positioned outdoors away from home wiring and supplied with a modest native floor reference..the antenna is an effective performer.
The circuit makes use of a JFET supply follower and a BJT follower stage to supply impedance transformation of the Hello Z capacitive terminal to a 50 ohm Z drive for a transmission line. This circuit works superb however has some downside, specifically requiring 65mA of present and having a considerably giant enter capacitance, which reduces efficiency with frequency. Ray says:
I made a decision to make use of a large bandwidth op amp to simplify the circuit, cut back present, and supply a little bit voltage acquire. The op amp I selected was one I’ve used earlier than for RF amplification..the LT1818.
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