Circuits & Schematics Radio: antennas antenna - 2

11. Long Range FM Transmitter
    Circuits Radio
    .. after the oscillator stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element Yagi antenna, this transmitter can provide reasonably good signal strength up to a ...
    07-10-2010

12. 2 km FM transmitter
    Circuits Radio
    .. With a matching antenna, the FM transmitter circuit shown here can transmit signals up to a range of 2 kilo meters. The transistor ...
    19-07-2010

13. UHF antenna amplifier
    Circuits Radio Beginners
    .. as possible. For best results, the cable must be directly soldered to the PCB. The circuit should be installed near the antenna and housed in a water proofed case. The power supply for this uhf tv antenna amplifier is fed through the ...
    09-04-2010
14. Handheld 2.4 GHz Spectrum Analyzer. Part 2
    Circuits Measurement Radio
    .. it was placed at the top of the phone, but now there is located the module, and it is no good idea to place wires near its antenna. But I must admit I didn't miss an on/off switch. The analyzer consumes less than 15 mA, so it can work ...
    22-02-2010
15. Handheld 2.4 GHz Spectrum Analyzer. Part 1
    Circuits Measurement Radio
    .. LCD contacts to the pads with wire. The CYWM6935 module is well above the 3.3mm limit, but it can be placed at the phone's antenna place if previously you cut the module to strip off the transmission antenna: It will not be used. Once ...
    21-02-2010
16. FM Telephone Bug
    Circuits Security Radio
    .. wire from the phone line goes to IN2. The green wire from OUT1 goes to the phone(s), as well as the red wire from OUT2. The antenna is a piece of thin (22 AWG) wire about 5 inches long. All capacitors are rated for 250V or greater. The ...
    16-12-2009
17. BH1417 Stereo PLL FM Transmitter
    Circuits Radio
    .. is the range of BH1417 Stereo FM Transmitter? Range of the transmitter depends on many factors. a) Length and type of the antenna (the longer the better, copper will radiate radio waves better than aluminum) b) Supplied voltage (6V Max ...
    10-06-2009
18. Adding a removable Antenna to your WRTSL54GS
    Circuits Radio
    .. a fixed antenna, with no option for adding one. I decided that I needed to fix that design flaw. Note: By adding various antennas to this device it may become possible to violate your local or federal regulations on output power. Be ...
    .. been contemplating a few projects for some WRTSL54GS routers with OpenWrt,however I really need these to have a high gain antenna on the WRTSL54GS. As you may recall, this model has a fixed antenna, with no option for adding one. I ...
    15-04-2009
19. AM Walkie-Talkie Experiments
    Circuits Radio
    .. feeding a dynamic earpiece through an impedance transformer. The power supply is a 9 Volt battery and the telescopic antenna contains a base loading coil. The switching did intimidate me a bit. While not a complex circuit and having ...
    26-03-2008
20. Active Antenna for AM, FM, SW
    Circuits Radio
    .. 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 = 1 M C1 = 470 pF C2 = 470 pF L1 = see text Q1 ...
    .. magazine, July 1989 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 ...
    10-02-2007

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