MFJ MFJ-959B Bedienungsanleitung

MFJ-959B INSTRUCTIONS

Introduction

The MFJ-959B RECEIVER ANTENNA TUNER/PRE-AMPLIFIER is designed to

properly match your antenna to your receiver for better performance from 1.8 to

30 MHz with a single antenna.

Maximum signal power transfer occurs when the impedance of the antenna

matches the impedance of the receiver. This will happen at specific frequencies

as determined by the length of the antenna. At these frequencies a tuner is not

needed. If the antenna is used at frequencies other than the resonant

frequencies, the signal from the antenna to the receiver may be significantly

reduced due to the mismatch of the antenna to the receiver. The MFJ-959B can

transform the antenna impedance to match that of the receiver for maximum

signal. The MFJ-959B also has a broadband transistor pre-amplifier to help

boost signals to a copyable level which is especially helpful on the older

receivers which lack sensitivity. A 20 db attenuator is also built in to help

receivers plagued with overload problems from strong signals.

Installation

1. Plug the 12V AC adapter into the power jack on the MFJ-959B, then plug the

adapter in to the 110 AC wall socket. If 110V AC is not available, plug external

power of 9-18V DC into the rear panel power jack. The tip of the subminiature

plug is positive and the sleeve is ground.

2. Connect your receiver antenna input to one of the two output connectors on

the MFJ-959B marked RECEIVER. There are two sets of outputs for use with

2 radios and each output has an SO-239 connector and an RCA phono jack

connected in parallel for added convience.

3. Connect the antenna to one of the ANTENNA connections on the MFJ-959B.

There are two sets of inputs. Each input has both an SO-239 connector and

an RCA phono jack for the antenna connection. For best results when using a

random wire antenna with the MFJ-959B, the wire should be 1/4 wave or

longer at the lowest receiving frequency.

Operation

1. Set the RCVR & ANT pushbutton switches to the desired position to select the

proper receiver and antenna.

2. Set the ON-OFF/BYPASS pushbutton switch to the OFF/BYPASS position

(This bypasses the MFJ-959B).

3. Tune the receiver to the desired frequency.

4. Set the ON-OFF/BYPASS switch to ON.

5. Set the TUNER/AMP-TUNER switch to TUNER.

6. Turn the ANTENNA and RECEIVER controls on the MFJ-959B to about

mid scale and rotate the INDUCTOR switch for maximum signal. On the

higher bands, the ANTENNA and RECEIVER controls may need to be set to

3/4 scale to find the maximum signal of the inductor. Inductor "A" setting is for

the lowest frequency and Inductor "J" is for the highest frequency.

7. After finding the maximum signal with the inductor, turn the ANTENNA and

RECEIVER controls for maximum signal. If necessary, try one inductor setting

either side to see if any greater signal can be obtained. With an antenna close

to resonance the increase in signal may be very small, but on antennas not

near resonance, an increase of 2 to 4 "S" units may be achieved.

8. If added signal gain is needed, set the TUNER/AMP-TUNER to TUNER/AMP

switch. This will give an added gain of 20 db to help pull the weak signals out

of the noise.Fine tuning of the RECEIVER and ANTENNA controls may be

required for maximum gain. Adjust GAIN control for the desired signal level.

Note: Gain control is usable only when the TUNER/AMP-TUNER switch is in

the TUNER/AMP position.

9. If overload problems show up in your receiver due to nearby transmitters

(Ham, CB Shortwave, Broadcasting or others), set the ATTN-ON/OFF switch

to ATTN-ON to reduce the interference. The tuner circuit will help reduce the

out-of-band interference and the attenuator will reduce the overloading signal

as well as the desired signal.

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