Antennas


Posted on Feb 5, 2014

The antenna used for either receiving or transmitting is a vital element in the communication link. In most cases the antenna has a great deal to do with how well the receiver or transmitter works. Antennas are reciprocal, meaning that an antenna designed for transmitting will work for receiving. A passive receiving antenna will also work for tran


Antennas
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smitting. BUT the goals are different for reception and transmission. In general a receiving antenna should provide a good signal to noise ratio. In general a transmitting antenna should radiate energy as efficiently as possible in the direction of the receiver. A loop may make a great receiving antenna for a broadcast band radio but would be terrible as a transmitting antenna. Transmitting into an active receive antenna will let the smoke out of it. The B&W Broadband Folded Dipole Antennas ( ASW-90 ) U. S. Patent 4423423 is an excellent receiving antenna for broad band signals like chirp sounders. This design is also called a T2FD. The efficiency for transmission goes down rapidly below 40 meters. Hy-Gain HA-4000, 18TD, Collins TD-1, 637T-2 - a dipole made with two steel tape measures as the center part. You pull out the tapes, marked in the metric system and you`re good to go 637T-2 has two reels with antenna wire on each. Center support hole on top and type N(f) connector on the bottom. Used to quickly and easily make a dipole for NVIS ops. GRC-106 15 foot whip - photo - in CW-206 bag - Fair was selling these as a GRA-50, but they are for some transmitting application because of the insulating sleeve for the lower whip (ms-11x whip sections. Not the receive only antenna for the R-442. ) Tape Whip Adapter - Accepts 5/16-24 male thread on mil antennas and screws into 3/8-24 ham, CB, commercial antenna bases. The 5/16-24...




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