The helical antenna is to be mounted on the station for personal use in a portable version. Compared with the male telescopic antenna coil is smaller in length, which creates the undeniable advantages of using radio stations in urban environments. Despite the small size, this antenna… Continue Reading
The necessary instruments and tools: 1. Ampervoltmetr (AVOmetr) a linear scale (arrow) with outside dimensions 30V, 150AT, 15AT, current 15 Ma, 150 Ma. 2. wavemeter – scheme is shown below: Coil L1 comprises 4,5 coil wire diameter 1-1,5 mm, wound on errands,… Continue Reading
Resonant frequency meter is designed to determine the electromagnetic level in the right place. I'm using the wave meter to adjust the transmitters maximize RF voltage in the antenna. Wavemeter comprises directly from the microammeter , rectifier RF voltage (vch dioda D311) and the resonant circuit (frame… Continue Reading
This “beetle” od powered from single battery hours – “tablet”. The length of the signal transmission for Chinese receivers with good setting is 200 m. The oscillator circuit is formed on one transistor KT315. The transistor can be replaced by other similar parameters with high. coil L1… Continue Reading
The range of the wireless microphone more 300 meters outdoors. In spite of the low voltage 3V power wireless microphone is powerful enough, signal confidently trampled him to the radio through 3 floor of a building. The frequency range of the radio microphone 87 to 108 MHz.