User Guide

ManualsBrandsLnR Precision ManualsDipole AntennaLnR Precision EF-10 End Fed Dipole Antenna

SPECIFICATIONS

Polarity: Depends on mounting configuration

Design Z: 50 Ohms

V.S.W.R. Bandwidth 20M: 500KHz 1.5:1

V.S.W.R. Bandwidth 40M 140KHz 2.0:1

V.S.W.R. Bandwodth 10M 900KHz 1.5:1

Power Handling: 25W CW/SSB

Weight: 0.5 lbs

Length: 41’

Hardware: Stainless Steel

Connector: Silver/Tefon SO-239

Radiator #18 black poly coated copper clad

LnR Precision, Inc.

10490 US Hwy 220 Bus. N.

Randleman, NC 27317

Voice: (336)495-7713

FAX: (336)495-7608

www.lnrprecision.com

***************************

NOTE:

The EF-10/20/40 may also be used on 20/30M by replacing the 40M tip with a

38” tip. This will raise 20M resonance a bit, but should not be a problem; espe-

cially if 20M was initially set to the CW portion of the band, or by connecting

the stub to the choke end closest to the matchbox and reestablishing 20M reso-

nance as desired. Alternatively, for 30M monoband use a 1/2 wavelength

wire– begin with 46.5’ of wire.

Operation as a

monobander on any band between 60M and 10M can be ac-

complished by removing the factory radiator and installing the appropriate 1/2

wavelength wire. Calculate the approximate length from L= 468/F(MHz). As

an example a 25’ 10” wire will allow operation on 17M as a monobander. Ini-

tially, cut the wire a bit long and trim for best V.S.W.R.

ENDFEDZ EF-10/20/40

10M/20M/40M END FED DIPOLE

MK II

PARTS LIST

PART NO. QTY DESCRIPTION

SUB14004 1 10/20/40 METER EF MATCHBOX

SUB1406 1 20M RADIATOR 34’ 0”

1402 1 20M TUNING STUB

1409 1 END INSULATOR

14417 1 #10 SPLIT RING LOCKWASHER

2814 1 #10 STAINLESS HEX NUT

2815 2 #10 STAINLESS FLATWASHER

32767 1 SHIPPING BOX

1408 1 EF-10/20/40 MK II MANUAL

SUB14005 1 20M CHOKE W/ HARDWARE

SUB1412 1 87” 40M TIP ASSEMBLY

1411 1 THUMB NUT 10-32

SUB14005

SUB1412

SUB14004

Summary of content (2 pages)

PAGE 1
ENDFEDZ NOTE: The EF-10/20/40 may also be used on 20/30M by replacing the 40M tip with a 38” tip. This will raise 20M resonance a bit, but should not be a problem; especially if 20M was initially set to the CW portion of the band, or by connecting the stub to the choke end closest to the matchbox and reestablishing 20M resonance as desired. Alternatively, for 30M monoband use a 1/2 wavelength wire– begin with 46.5’ of wire.
PAGE 2
ASSEMBLY 1. This antenna is essentially a half wave dipole with one important difference– the feedline is at the end of the antenna. The antenna is suspended at its ends by the two included end insulators– one of which is integral to the matchbox. 2 In order to have the least possible influence on the antenna, insulated lines are recommended for attachment to the insulators. The antenna may be suspended horizontally, vertically or sloping.