Showing posts with label cw. Show all posts
Showing posts with label cw. Show all posts
Thursday, August 28, 2014
Small Circuit Multiband Radio Transmitter CW
This is a Small Circuit Multiband Radio -Transmitter CW for who wants to learn more about radiofrequency, mainly operating principle from radios transceivers multiband, That schema consists of a frequency oscillator RF, which is the main component us transmitters and radio receivers.
He oscillates for high frequency, he is called variable frequency oscillator or VFO, their frequency may vary of 5.2 MHz to 15 MHz, depending the coil chosen and signal can be received in the band shortwave by any receiver radio.In S1 is used a switch type bell, but can-if use a handler CW, these used by radio amateurs. How antenna should-if use a the type dipole from 1/4 wave.
Sunday, August 10, 2014
Razor sharp CW filter Wiring diagram Schematic
The Razor-sharp CW filter Circuit Diagram consists of four stages of active bandpass filtering provided by two type-µ integrated-schema dual op amps and includes a simple threshold detector (diodes Dl and D2) between stages 2 and 3 to reduce low-level background noise. Each of the four filter stages acts as a narrow bandpass filter with an audio bandpass centered at 750 Hz. The actual measured 3-dB bandwidth is only 80 Hz wide.
Razor-sharp CW filter Circuit Diagram
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