Contact Information
Radio Astronomy Lab

Timeline for Milestones
Aug - decided to build Radio Telescope
Sep - FM radio with non-directional loop didn't work
Oct - built Helix 1.4 GHz - Tata Sky STB - PC with RSP-I
Nov - tested with many objects >~40 Jy; got SNR > 1.5
Jan - built 2.7 GHz; could see objects ~ 20 Jy with SNR ~3
Feb - NSD at GMRT; realized that huge table-tops for bright objects are not good
Mar - figured that table-tops are due to Auto Gain Control of STB
Apr - physics practical projects of Std XI churn out 1.4 GHz Horn and dipole with parabolic reflector
May - Pooja and team tested helix (1.33 GHz) at GMRT; confirmed with design calculations; discovered harmonics
Sep - worked on calibration
Apr - tried to make 4 GHz helix with fine (<5deg) beam - failed (beyond STB band)
Oct - assembled Ku band system with just a feed as antenna
Feb - Found beam profile for Ku-LNA using 60W CFL at 20 ft; the same didn't work for Helix (probably due to low LCP component). Made Can-Antenna (simplest system yet)
Feb - NSD was a disaster for the helix (probably rusty connections; also new HD STB's are too smart)
Mar - Henna planned to make wire dipole (mini Jove-style)
Apr - Found that motorized mounts are too costly; hence plan shelved
Sep - Rewired the Helix as rains had stained the copper and moisture had seeped into the co-axial cable. Obtained normalized beam profile of Helix using spiral CFL.
Oct - Calibrated Helix + STB with spiral CFL. Presented the system at the Pro-Am III conference in Mumbai on 26th. Learned a lot from B C Joshi and Avinash Deshpande
Nov - Attempted to create better noise sources, but failed for want of components
Apr - Made a dummy load of 75 Ohms with 2W resistors to determine system temperature
Jun - Trip to Lamington - Got CRO, Power supplies, connectors and a nice Satellite finder with a spectrum display. Changed the wire on the Helix to get better results.
Sep - Figured out that STB's get used up and then give lot of noise and distortion. Switched to new STB
Oct - Experimentally observed that CFL's emit not due to the electrons spiraling in the tube, but the circuit inside. All antennae (Helix, LNB, Cantenna) work smoothly with the CFL/radio towers as source and Sat-Finder/STB as Rx
This Month
  1. Get beam profile of all antenna using CFL
  2. Figure out calibration using noise source / dummy load
  3. Figure out how to improve helix (GP design & pointing) with help from Arvind Paranjpye's (Nehru Planetarium)
  4. Draft experiments for MSc students
Next Month
  1. Improve robustness of systems to make them student-worthy
  2. Create lab manual for radio physics / astronomy expt. at Mumbai University

Home | Members | Schedule | Archive | Contact Information | Radio Astronomy Lab

Back to Abhinav Vidyalay Home  o  Copyright belongs to Prof. Kedar Soni
Last updated: 03/02/15.

sherri hill sale prom dresses 2016 prom dresses 2016 cheap la femme dresses prom dresses 2016 prom dresses 2016 prom dresses 2016 sherri hill sale cheap la femme dresses sherri hill sale cheap la femme dresses prom dresses 2016