Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KB0BRO, Jul 15, 2018.
Looks like a low power telrex 40 meter job. 100 watts. The high power had 2 ceramic doorknobs in series. Kilowatt AM. I still have a pair. I'm using one to auto decouple the top of an a latter line fed 100' apex 80m vertical loop into a bi square on 40m. Works excellent.
My first impression of the original photo was that it seemed similar to Telrex traps i had seen. But, unlike WIK, I didn't get the feeling that the trap was badly corroded, but rather, that, at some point during its lifetime, some one had glopped on a mess of marine hull sealant or roofing tar to extend its lifetime. Appears to be brushed on or applied with a paint stick.
Old post, I know. These traps were given to me by an OT and he told me they were Telrex.
Telrex Traps used High-Q, High Voltage Ceramic Capacitors and Inductors (Wire Coil on form)
Encapsulated in 7 coats of 3M Epoxy.
L-C Resonance Calculator
High Energy Corporation (Parkesburg, PA)
still manufacturers those classic High-Voltage Door-Knob Capacitors
Telrex Catalog Pages (Asbury Park, New Jersey)
Telrex “Balun-Fed” 40 and 80 meter “Duo-Band” Kit (1962, $48.00)
Antenna Traps (R—L—C)
Using Antenna Traps (Sotabeams, UK)
Jotrin Electronics (Russia)
Antenna Trap calculator
Typical Multi-band (40-20-15-10) Dipole Antenna
Cited in DBBFD/48 user sheet.
Michael Ercolino, Wanamassa, NJ (US Army)
US Patent 2,576,929