Antennas Malloy Communications Antennas Please choose from the following links to view information specific to each antenna we develop: Shunt fed vertical HF Conical monopole... Biconical Discone XXX Quadrifilar Helical Antenna Tactical HF Portable Broadbanded Please contact us for more information about the antennas we offer, or to place your order. All Contents Copyright (c) 2009 Malloy Communications Site Designed by TygerHawke ...

Quadrifilar Helical Antenna QUADRIFILAR HELICAL ANTENNA Hardware Store QFH NASA Mars Rover QFH The Quadrifilar Helical Antenna is one of the most interesting antennas that I have... in QST Magazine (REFERENCE). The Z is matched via the coil of helix at the base of the feedpoint, located at the top of the antenna. The bandwidth is wide (please see the VSWR graph... at the top of the page). This type of antenna is not terrestrial. It is designed to be pointed like a rifle at it's intended target. The half power bandwidth is approximately 120...

, or lightning arrestors in line with the coax. On the roof where all the antennas are mounted, they were placed on one pedestal. This created a problem every time some one would key up... became involve with the project was that the antennas were not maintained. Thus when we attempting to disconnect them from the coax, the antenna connector crumbled in our hands. As... to 108 MHz. One of the problems with the radios is the antenna connections are on the front panel. There are two connectors. A panel mounted female N-connector for the frequency range...

Discone Discone The discone is in the family of biconical antenna systems. Their design structure is similar to each other. The only difference is the radiating portion... of the discone is a disk rather than a cone. Both have broad banded characteristics, however the discone is advertised as a vertically polarized antenna. I have not found that to be true. It... only leaving enough for the nut to grab the threads to hold the disk in place. After testing the antenna with the extra vertical shaft we found that it inhanced the bandwidth, so we...

Biconical BICONICAL Based on my own review and research in the technical literature, S.A Schelkunoff wrote the original paper on broadbanded antennas (Theory of Antennas... of Arbitrary size and Shape." IRE Proc. 1941) In 1948 C.T. Tai wrote a similar article entitled: On The Theory of Biconical Antennas. One of the problems with their writings... enough (with some exceptions) to keep the antenna from blowing up the radio with high VSWR (Voltage Standing Wave Ratio). That is, the amount of power delivered from the radio...