Antenna Supporting Structure
Antenna Systems
Celestial Radio
LF Activity
Order Info
Radio Astronomy Facilities
Radio Systems
RF Applications
Support Systems
VLF Activity


Antenna Systems

Our antenna systems are categorized as fixed and portable.  All fixed antennas are located on an antenna farm at our observatory and are described on this page.  They are used with the fixed receiver installations described here.  The portable antennas generally are whip antennas of varying lengths and configurations used with ELF and VLF receivers.  Click here for a description of our portable antennas and click here for a description of the receivers used with them.

Antenna Farm

The antenna farm includes a variety of technologies:

The transmission lines from each antenna are fed to a central location where the shields are bonded to earth ground at a grounding block. 

All antenna transmission lines pass through a grounded protector assembly before connection to a receiver. The grounding and protection bar is made from a 1/8 in x 12 in copper bar with 90 V lightning arrestors rated from dc to 3 GHz. The assembly is bonded to the earth electrode system by 6 AWG copper wire. Heatshrink tubing is used to protect the connections from rain (not all heatshrinks are completed in the photograph below).