Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1779148 | New Astronomy | 2012 | 4 Pages |
Abstract
In this paper, we investigated the radio frequency interference (RFI) that future Very Long Baseline Interferometer (VLBI) observations in Malaysia may encounter. Four frequency windows below 2.8 GHz were chosen for this study and their spectra were measured at four sites. The frequency windows are 322-328 MHz, 608-614 MHz, 1660-1660.5 MHz and 1660.5-1668.4 MHz. The measured averaged RFI floor noise levels in these windows are â99.992 (±0.570) dBm, â99.907 (±0.639) dBm, â100.220 (±0.4941) dBm and â100.359 (±0.110) dBm, respectively. We found that only two bands below 2.8 GHz are permitted for the purpose of radio astronomy in Malaysia. They are 608-614 MHz and 1660-1660.5 MHz. The RFI levels in these permissible bands at the best site (Langkawi) were also measured and concluded to be relatively low. Main sources of RFI in these bands in Malaysia were identified. We also reviewed several current VLBI observations in these two bands.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Zamri Zainal Abidin, Zainol Abidin Ibrahim, Zulfazli Rosli, Siti Fatin Fathinah Malim, Norsuzian Mohd Anim, Noorkhallaf Noorazlan,