| 摘要 |
FIELD: physics; electricity. ^ SUBSTANCE: according to proposed method including use, within each range, of ferrite antenna connected to input of high frequency amplifier (HFA), in low-frequency and mid-frequency ranges of wavelengths, ferrite antenna is selected as antenna coils with ferrite core where there is connection coil and which is connected, through key, to external antenna, antenna coils being used as choke, and high frequency amplifier being used with high input resistance and low level of inherent noise. Signal currents of antenna coil are transformed to signal voltages on high-resistance loading presented by negative feedback resistance. Low frequency filter is used for mirror channel suppression. ^ EFFECT: mirror channel suppression without connection coil. ^ 2 dwg |
