Showing posts with label receiver. Show all posts
Showing posts with label receiver. Show all posts
Thursday, September 25, 2014
FM Radio Receiver Antenna Booster Circuit
This affordable FM radio receiver antenna enhancer makes use of the BF324 TO92 type pnp transistor in a grounded-base arrangement.The circuit can be utilized like a signal booster with VHF receivers whose front end is afflicted with reduced level of sensitivity (like a lot of valved and army supplemental variations). The frequency selection of the preamplifier is approximately from 75MHz to 150MHz.
The 2 inductors in the circuit are do-it-yourself. L1 includes 10 turns of 24SWG enameled copper wire; the inner dimension is 3mm, without any core. Inductor L2 bears 13 flips of the identical wire, as well as an inner diameter of 5mm; without core as above. A building tip: tight-wind the inductors making use of three and 5mm drill bits respectively in the form of momentary cores.
The prototype of the preamplifier was effectively tried with an 88-108 MHz FM broadcast receiver along with a 2-metre VHF ham receiver. The preamplifier consumes around 2.5mA from a 5-volt supply.
Sunday, August 17, 2014
Short Wave Regenerative Receiver For AM and DRM
The face that FM receivers operate on pretty high frequencies makes their practical realization somewhat difficult, but most of the problems, as in many other amateur builds, originates from building the coils, except the self-bearing, small-inductance coils (without the coil body), which are easy to make, especially if there arent many of them in the device and if no special instruments are required for setting up their proper inductance value. The coils used in this FM receiver are just like this, and there are only two of them, making the practical realization much easier.
Short-Wave Regenerative Receiver For AM and DRM
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