Introduction

Thoth Technology operates an 11 meter antenna on the site of the Algonquin Radio Observatory (ARO) in the Province of Ontario, Canada. The antenna is located about 250 metres from the site of the 46 meter antenna at 45 deg 57 min 19.8 sec latitude, 281 deg 55 min 37.0 sec east longitude, 260.4 m elevation.

Mechanical Description

A description of the mechanical configuration of the 11m antenna at ARO is given in Table 1.

Table 1  Mechanical Configuration, 11 m Antenna at ARO

Base Antenna mounted on 20m x 15m concrete pad with 2m deep foundation footing and pyramidal concrete base structure of 3m height above grade.
Structure Steel base and surface support structure, with aluminum skin. Focus mount for feedhorn or subreflector with steel tripod support structure.
Mechanical Design Equatorial mount and gearbox arrangement
RA range of motion 360 degrees
DEC range of motion 180 degrees
Maximum operating wind velocity 80 kmhr-1 (50 mph)
Operational temperature range -40oC to +38oC
Maximum RA slew rate 25 degrees per minute (after refurbishment)
Maximum DEC slew rate 25 degrees per minute (after refurbishment)
Pointing accuracy ±100 arc sec. (TBC)

Antenna Performance

The following table presents estimated antenna performance based on the antenna size characteristic.

Table 2  Antenna Performance, 11 m Antenna at ARO

Aperture efficiency 0.4 (TBC) at 10 GHz (full surface); 0.3 at 14 GHz (TBC)
Area gain 74 dBi at 10 GHz (TBC)
Effective aperture gain X-band: 55.5 dBi at 8 GHz, 59 dBi at 14 GHz (TBC)S-Band: 46.8 dBi at S-band (TBC)

Existing Facilities

Thoth currently maintains a science grade data-acquisition system for the 46m antenna located on site with includes systems that may be utilized by the refurbished 11m antenna including:

  • (a) Bendix Hydrogen maser (NL-09): provides time and frequency reference with frequency stability of up to 1:1015
  • (b) Dual frequency S- and X-band front end receiver (proposed using existing feeds for simultaneous S- and X-band observations).
  • (c) Data-acquisition system backend for scientific observations: Dual Frequency X- and S-band operation with USB and LSB outputs for both RF channels. Baseband bandwidths variable from 250 kHz to 16 MHz. 1- and 2-bit sampling and NASA MkV disc based data recorder system
  • (d) Turbo-Rogue GPS satellite tracking receiver
  • (e) Satellite Internet system and phone system.
  • (f) Site power prime feed by dedicated 13 KV hydro line with automated backup power using a 300 KVA GE Generator system.