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MFJ-61xx Instruction Manual
INTRODUCTION
The MFJ version of the classic End-fed Zepp consisting of one ½ wave radiator and ¼ wave stub
is an antenna that delivers better than average transmitted signals even when installed at only ~¼
wavelength, above and it is directly-fed with any length of 50-Ohm coax. With the exception of
40-meter coverage (~150-200 kHz) no tuner is necessary for 15-20 meter operation with low
SWR across the band.
A further consideration is that this antenna is also quiet, when compared to inverted "V's" (and
verticals, especially). A reduction of 2 – 3 "S" units of noise may make the difference in that
DX contact you can now hear above the noise!
End-feeding a half wavelength of wire has certain mechanical advantages over center-feeding
the same length of wire. It can be erected in limited space situations where a center-fed antenna
is not possible.
The added bonus: you can virtually "hang & play" this antenna as we construct them. No
tuning, trimming, etc. required. Just follow the easy installation instructions and suggestions, the
warnings, and you'll be "up and running" in no time flat, and capturing DX, while receiving
signal reports as never before using lesser antennas.
Once connected, you'll find the MFJ 61xx End-fed Zepp presents a low SWR across the entire
band. However, it is a "one-band antenna" depending which band you chose.
generic illustration of the antenna with its shorted stub and coaxial connection.
• Always mount or install antennas beyond the reach of adults and
children. Make certain your antenna installation meets RF
exposure guidelines
• Contact with exposed parts of this antenna system can cause RF
burns and other injuries.
• Constructing or erecting antennas where they may contact
electrical power lines can result in injury or even death
Autoryzowany Przedstawiciel MFJ w Polsce:
Warnings
INRADIO
ABEL & PRO-FIT Centrum Radiokomunikacji
ul. Puszkina 80
92-516 £ódŸ
tel.
(+42) 649 28 28
fax:
e-mail:
internet:
www.inRADIO.pl
1
End Fed Zepp Antenna
Figure 1 is a
Poland
(+42) 677 04 71
Related Manuals for MFJ MFJ-61 Series
Summary of Contents for MFJ MFJ-61 Series
- Page 1 End Fed Zepp Antenna INTRODUCTION The MFJ version of the classic End-fed Zepp consisting of one ½ wave radiator and ¼ wave stub is an antenna that delivers better than average transmitted signals even when installed at only ~¼ wavelength, above and it is directly-fed with any length of 50-Ohm coax. With the exception of 40-meter coverage (~150-200 kHz) no tuner is necessary for 15-20 meter operation with low SWR across the band.
- Page 2 Dimension “L” represents a ½ wave, and “F” represents a ¼ wave, which, in this case is a ¼ wave stub, used for matching. The MFJ 61xx End-fed Zepp is a basic “broadside” radiator and is broadly bi-directional perpendicular to the run of the wire. A pair of these antennas at right angles (NE/SW;...
- Page 3 Serious injury or Death may occur. The MFJ 61xx End-fed Zepp ships assembled and ready to install. The lengths of the antenna wire and stub are quite critical and should not be changed. Use Nylon ropes to support the ends of the antenna from suitable structures or trees.
- Page 4 You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask. You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to [email protected].