MFJ Enterprises 8100w World Band Receiver Manual

MFJ-8100                                                                 
World Band Receiver 
 
11 
 
With the control turned fully to the left (counter 
clockwise), the receiver is virtually silent.  
Regeneration begins at a certain point as you turn the 
control clockwise.  The exact point varies not only from band 
to band but even as you tune within a given band.  
Regeneration begins as an audible increase in background 
noise followed by a soft hiss.  The hiss, or any signals that 
may be on...

MFJ-8100                                                                 
World Band Receiver 
 
12 
On modern ham radio transceivers, tuning SSB is made so easy 
by means of internal filters that many licensed ham operators 
are not aware of the basic technique for tuning in SSB 
signals on receivers without such filters. 
 
The first fact to know about any given group of SSB signals 
is whether they are Upper (USB) or Lower (LSB) Sideband.  In 
ham radio communication, LSB is used on 1.8 through 7.3...

MFJ-8100                                                                 
World Band Receiver 
 
13 
USING & ENJOYING YOUR RECEIVER 
 
To get maximum satisfaction from your new shortwave receiver, 
we encourage you to develop good familiarity with these 
sections of this manual: 
 
  __ Antenna Considerations 
  __ Regeneration Control 
  __ Band Switch and Tuning Ranges 
  __ Audio Notes 
 
However, lets say it all as briefly as possible: 
 
1.   The better the antenna, the better the reception.  In...

MFJ-8100                                                                 
World Band Receiver 
 
14 
SETTING UP A USEFUL SHORTWAVE ANTENNA 
The reason why we provided a universal binding post 
antenna connector (plus separate ground connector) is to make 
it as easy and economical for you as possible to try out 
different antenna setups.  By universal, we mean that you 
can insert a banana-style plug OR make various styles of 
connection with a simple bare wire. 
 
Your receiver is so sensitive that even...

MFJ-8100                                                                 
World Band Receiver 
 
15 
The amplifier circuit provides sufficient output for moderate 
speaker volume.  Miniature speaker systems designed for 
Walkman and similar personal stereo devices will plug 
right into J2 or J3 and work very well.  However, please 
remember that the amplifier is specifically designed for 
headphone operation.  If you prefer room-level speaker volume 
for long listening sessions, we recommend an external...

MFJ-8100                                                                 
World Band Receiver 
 
16 
The purpose of the following information is to give newcomers 
a general idea of what to expect to hear in each of the 5 
frequency ranges tuned by your receiver. 
 
First, please understand that the frequency markings on the 
tuning dial can be only approximate.  They indicate the 
general neighborhood of major frequency bands and have an 
accuracy only within a few hundred KHz.  (If you are 
wondering...

MFJ-8100                                                                 
World Band Receiver 
 
17 
30 meter ham band (CW and RTTY only in the USA) is at 10.1 to 
10.15 MHz. This tuning range is generally busy 24 hours a 
day. 
Range D: 13.2 to 16.4 MHz. 
On the 20 Meter ham band (14.0 to 14.35 MHz), you can hear 
strong CW and SSB voice signals from around the world 
throughout the day and well into the evening.  This is the 
most active and crowded of the international ham radio bands.   
You also are...

MFJ-8100                                                                 
World Band Receiver 
 
18 
Test your headphones on a personal stereo and compare them to 
one or more other headphones.  It is very possible for 
inexpensive headphones to become defective.  Also, make sure 
that the battery is in good condition. 
 
Steady, high-pitched squeal or whistle. 
Regeneration control is turned too far clockwise. 
 
NOTE: We have designed this book and the receiver itself to 
assure that you can install it...

MFJ-8100                                                                 
World Band Receiver 
 
19 
[Authors Hint:  To save you time as well as wear and tear on 
the PC-board, heres what my own curiosity showed:  reducing 
C3 can easily bring in 12 and 10 Meters on Band E.  However, 
attempts to increase this capacitance beyond 220 pF without 
ALSO increasing total inductance are pointless if youre 
looking for good 160 Meter performance.] 
 
While its not intended as a communications receiver, the...

MFJ-8100                                                                 
World Band Receiver 
 
20 
keep it and keep on listening to it when nobody else is 
looking! 
LEARNING MORE 
The purpose of your Receiver and the details provided in this 
instruction manual are to help you become better acquainted 
with radio communications and electronics: as a hobby, as a 
possible profession, or both. 
 
Among the hundreds of publications available, we are pleased 
to recommend the following as especially...