hat
Gen lòt karakteristik oswa fenomèn ki asosye ak preanpli ak antèn aktif ki pa vle di ke sikwi ou a deregleman. Pou egzanp, si ou gen fò AC hum nan anviwònman an HF, antèn la se twò pre yon kòd AC oswa Powerline. Siyal HF ka pi klè nan anviwònman an VHF / UHF pase nan anviwònman an HF. Poukisa? Malgre ke swa poutèt yo kapab itilize pou HF, fòs siyal la pral pi grannèg ak poutèt a VHF / UHF. Sepandan, HF siyal-a-bri rasyon a se pi bon ak poutèt a double-pòtay-MOSFET ki baze sou. Eseye tou de epi sèvi ak pi bon an pou kondisyon patikilye reseptè ou.
eng
There are other characteristics or phenomena associated with preamplifiers and active antennas that does not mean that your circuit is malfunctioning. For example, if you have strong AC hum in the HF setting, the antenna is too close to an AC cord or powerline. HF signals may be clearer at the VHF/UHF setting than in the HF setting. Why? Although either pram may be used for HF, the signal strength will be greater with the VHF/UHF pram. However, the HF signal-to-noise ration is better with the dual-gate-MOSFET-based pram. Try both and use the best for your particular receiver conditions.