|
|
Cure of thermosetting resin is initiated by heat in the die and catalyst in the resin mix. The rate of reaction is controlled by heating and cooling zones in the die. The resulting high strength profile is cut to length, ready to use as it leaves the pultrusion machine. The controversy over metal versus fiberglass antennas continues, despite the over whelming evidence in favor of fiberglass. This article summarizes the contents of a number of other separate articles which have appeared in the industry media from time to time and is intended, from an objective point of view, to add credence to our claim that fiberglass is better. The ipso facto use of fiberglass, of course, does not guarantee a good antenna and there are a few antenna manufacturers who have "missed the boat" on techniques, which means there are poor quality fiberglass antennas, just as there are poor quality metal antennas, out there. Foreign Orders We do accept foreign orders. Foreign customers pay any applicable tariffs or duties, and must furnish shipping instructions. We will package and obtain exact shipping costs based on your preferred shipping method, and will provide an order total which must be prepaid before we ship. When specifying shipping instructions, please remember that our packages are usually 8 feet (96 inches) long! Interested in great deals on vacuum variable capacitors, ceramic transmitting tubes, vacuum relays, roller inductors, test equipment, and more? From time to time all of these items can be found Vacuum relays and other RF relays Vacuum variable capacitors, "doorknob" capacitors, and transmitting tubes Test equipment, receivers, and transmitters Transformers. Our company carries the entire line of Mart products, including their world-famous lines of high-power remote RF coaxial switches (up to 11 position!), quad antennas (UHF through 80 METER BAND!), antenna parts (such as spider hubs), heavy duty gin poles, tower insulators (insulates ENTIRE TOWER from ground), rotating side mounts, custom "H" frames, and much, much more. We now present the entire Mart catalog on-line! The catalog and linked pages offer current pricing, as well as many drawings, illustrations, and photos. NOTE....many Mart products are now IN STOCK, AVAILABLE FOR IMMEDIATE SHIPMENT! No need to wait for custom fabrication for many product classes. (Inquire) If you have any of these types of items to sell, (vacuum variable capacitors, vacuum relays, "doorknob" capacitors, variable inductors, or transmitting tubes ), either new, or good used stock, please state description, condition, and price by email or post.
|