the introduce about VHF antenna array of Yunnan Observatories

Shaojie Guo, Yunnan Observatories，Chinese Academy of Science

The VHF antenna array is consist of antenna, receiver, and data acquisition board. The antenna is designed to be transformation of half-wave dipole, which has four aluminium arms. The size of arm is 33cm*200cm, which can realize wider bandwidth compare to a single metal line. Receive can be operated in the frequency range from 55-65MHz. The gain and dynamic range of receiver are 65dB and 50 dB respectively. Data acquisition board uses the AD6657A-EBZ board whose sampling frequency, SFDR and quantization bits are 200MHz, 60dB and 12bits respectively. The AD board is controlled by XC4VFX20 which is belong to the Virtex4-FX family.