MFJ -998 Manuál s instrukcemi stáhnout pdf

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna

MFJ-1625 Window/Balcony Mount Antenna

Introduction

The MFJ-1625 Window/Balcony Mount Antenna is a 200 Watt antenna tuner that was designed

to provide portable or permanent HF communications on 80 through 10 meters and VHF on 6

meters. The universal mount design allows the user to install the antenna in many ways. The

mount will easily attach to window frames, balconies, and railings. The MFJ-1625 works well

indoors mounted to a desk or table as well.

The antenna consists of a whip tuner designed for tuning short whips as well as virtually any

random length wire antenna, collapsible whip, universal mount, and counterpoise wire. The

operating frequency is found by turning the knobs on the whip tuner and setting them for

maximum RF current. The counterpoise wire length can also be adjusted for maximum RF

current. The MFJ-1625 Window/Balcony Mount Antenna will allow the operator to get on the

air from locations where antenna size is limited.

The whip tuner section uses a reversible "L" network. The advantage of the “L” network is that

it has only two tuning controls, and only one tuning solution for given impedance match. The

MFJ-1625 has rear panel connectors for coaxial input and a “Hi-Z/Lo-Z” switch for reversing the

“L” network. An internal input-isolating current balun provides isolation of DC and RF grounds

for optimum tuning of the RF counterpoise.

An RF Current Meter indicates the summed antenna and counterpoise antenna currents, making

tuning particularly easy. Simply tune for maximum RF current.

Figure 1: MFJ-1625 Window/Balcony Mount Antenna

ANTENNA

ATTACHMENT

COUNTERPOISE

ATTACHMENT

COIL

1 2 3 4 5 6 ... 11 12

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Strany 1 - Introduction

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 1MFJ-1625 Window/Balcony Mount Antenna Introduction The MFJ-1625 Window/Balcony Mount Ant

Strany 2 - Assembly Instructions

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 10Tuning Out Reactance of Long Ground Leads If the station ground has a long lead, you ca

Strany 3

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 11Schematic

Strany 4 - Choosing a Mounting Position

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 12Tuning Chart You may wish to remove or make a copy of this page and place it near the t

Strany 5 - Installation

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 2MFJ-1625 Supplied Components • MFJ-1623 Window/Balcony Mount Whip Tuner • Window/Balco

Strany 6 - Using the MFJ-1625

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 3Assembly Instructions (cont.) Figure 3: Window/Balcony Bracke

Strany 7 - Tuning Procedure

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 4Choosing a Mounting Position We have provided 5 mounting options to choose from on the MF

Strany 8 - Matching Problems

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 5common mounting location. The counterpoise is simply placed on the floor. Some installat

Strany 9 - MFJ-1625 Artificial Ground

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 6 4. Tighten the screws on the rear of the base plate against the surface of the support.

Strany 10

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 7Tuning Procedure WARNING: Never transmit while changing the INDUCTOR SELECTOR. 1. Firs

Strany 11 - Schematic

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 8Grounding Hints To minimize RFI, antennas should be kept away from other wiring as much

Strany 12 - Tuning Chart

MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 9MFJ-1625 Artificial Ground The MFJ-1625 contains a series L-circuit that is used to tune

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