عندى مسجل او كايت فى البيت عادى نوعة بانسونيك يوجد فية موجة wm
واف ام لاكن اف ام دائما توش او لا يود اشارة لها
عاوز دائرة تقوى استقبال قناة اف ام 100.6
القناة دائما توش ولا يوجد اشارة او صوت الا فى بعض الاحيان بليل تيجى وتروح لى طول
كل ما اريدة كيف اقوى استقبال اف ام للجهاز لو فى دائرة يا ريت شرح بلصور

تفضل اخي


Active Antenna for AM/FM/SW:
This simple little circuit can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios.




Parts List:
R1 = 1M
C1 = 470pF
C2 = 470pF
L1 = see text
Q1 = MPF102, or NTE451

L1 can be selected for the application. A 470uH coil works on lower frequencies and lie in AM, for shortwave try a 20uH coil. This unit can be powered by a 9 volt alkaline battery. If a power supply is used, bypass the power supply with a 0.04uF capacitor to prevent noise pickup. The antenna used on this circuit is a standard 18-inch telescoping type, but a thick piece of copper, bus-bar, or piano wire will also work fine.

The heart of this circuit is Q1, a JFET-N-Channel, UHF/VHF amplifier in a TO-92 case.
It can be replaced with an NTE451.

Output is taken from jack J1 and run to the antenna-input of your receiver.

Although this little circuit can easily be mounted on a piece of vero-board, I have supplied the printed circuit board and layout diagram if you wish to make a printed circuit board.



وهذه اخرى