Adjustable helical antenna for a VHF radio

Details Adjustable helical antenna for a VHF radio Adjustable helical antenna for a VHF radio

1991-09-23

1993-12-28

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Spiral or helical type

343702, 343723, 343906, 343894, H01Q 136, H01Q 1112

Patent

active

052743934

ABSTRACT:
A VHF radio (10) which includes an adjustable antenna (20) formed from a component (28) shaped like an open helical compression spring which engages and can be screwed into a metal supporting collar (40) for tuning the antenna (20). An elongated plastic or rubber cylindrical member (30) is connected to the metal collar and surrounds at least a portion of the helical member (28). An end cap (32) is provided for closing the other end of the cylindrical member (30).

REFERENCES:
patent: 2214685 (1940-09-01), Stone, Jr.
patent: 2781514 (1957-02-01), Sichak et al.
patent: 3116691 (1964-01-01), Tatel et al.
patent: 3143331 (1964-08-01), Corey
patent: 3226725 (1965-12-01), Ritchie et al.
patent: 3300749 (1967-01-01), Lombardi
patent: 3523251 (1970-08-01), Halstead
patent: 3737912 (1973-06-01), Cribb
patent: 3818488 (1974-06-01), Majkrzak et al.
patent: 4048638 (1977-09-01), Cejka
patent: 4435713 (1984-03-01), Gasparaitis et al.
patent: 4620194 (1986-10-01), Bel Moratalla
patent: 4725395 (1988-02-01), Gasparaitis et al.
patent: 4725845 (1988-02-01), Phillips

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