Antennas Radios Amplifiers Baluns and Receiving Systems for HF

 

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Table of Contents page

Most
of the recent
efforts here have
been on transmitting
antennas. You can
see the progress by

clicking here.

160
Meters



       
AMPLIFIERS       


         
ANTENNAS           


BOATANCHORS




FT 1000 MK V Mod
Noise Blanker /
Click



FT1000D
Click Mod
NB
mod

Receiving
Antennas

Cars and Automotive

  



tremec



TKO 600 transmission
Shift Problems

I enjoy amateur
radio because there
are so many things
to learn. Amateur
radio is also a
great fraternity.
You can learn a
little bit about how
I started in this
hobby on my

BOAT ANCHOR

page. 

All contents of
this site are the
property of W8JI,
but links from other
sites are welcomed.
If you have a link
you think valuable
to others, please
e-mail me. 

If you copy
something from here
(and even if you
rewrite it) please
add a reference link
here! Linking
improves technical
accuracy because
articles on this
site are sometimes
corrected or
expanded. 

The most
important thing any
of us can do to make
the web an asset is
to help each other
with review to
insure technical
accuracy IMPROVES
with time! Let’s
work to make
Internet a reliable
source of
information instead
of a collection
of 
folklore!! 

Other Technical
Info Sites:

http://www.eznec.com/index.shtml  

http://fermi.la.asu.edu/w9cf/  

http://www.seed-solutions.com/gregordy/Amateur%20Radio/W8WWV%20Experimentation.htm  

http://www.ifwtech.co.uk/g3sek/


Current QRN
USA Lightning Storm
Maps

For an instant
check on USA
mainland QRN click
on

Intellicast
or

Lightning Storm
to a
weather map of
thunderstorms.

Some of this
site’s (W8JI.com)
contents are listed
below:



TKO 600 transmission
Shift Problems

Amplifiers

SB-221
Tank Voltages and
the parasitic
oscillation myth.
 

The real
explanations behind
amplifier parasitic
oscillations and
alleged damage by HF
amplifier parasitic
oscillations. Look
at voltage
throughout the tank
at frequencies
between 1 and
300MHz, and decide
for yourself.
Related article at Arcs,
what makes an
amplifier arc? 

Preamplifiers
for receiving.

Measurements
of receiving
preamps. Compare
your favorite
pre-amp (text
corrections
4/27/03) 

Arcs,
what makes an HF
amplifier arc? 

This explains causes
of amplifier arcing
in any amplifier,
including the TL-922
amp, Ameritron amps,
Heathkit
SB220 amplifier
,
and any other HF
power amplifier for
amateur or
commercial service.
Simple failures and
design or operating
shortfalls are often
explained as
parasitic
oscillations 

Bandswitch
failures
the
real causes and
cures of bandswitch
arcing and failures
in HF power
amplifiers that are
often attributed to
poor parasitic
suppression causing
oscillation

How
to load or tune your
HF amplifier
and
why an amplifier
arcs when tuned
incorrectly 

Inductors
deals with antenna
loading coils but
also applies to
amplifiers

Related page: Inductor
spice model

Relays
how to speed and
sequence amplifier
T/R relays and how
antenna transfer
relays affect
amplifier failures

Tank
Circuits
two
models showing tank
voltages, currents,
loss, and phase
shift

Vacuum
Tubes
how
they work in RF
power amplifiers and
why vacuum tubes arc
in amplifiers
Includes details on
3-500Z and 8877
3CX1500 A7 tubes.
Learn reasons tubes
fail in amps

Vacuum
tubes
, how they
convert d-c to RF
  how
RF amplifier tubes
convert dc to RF
power

VHF
Parasitics

and general
stability. Is your
amplifier unstable?
If you own a TL922,
SB220 series, 30L1,
or other amps with
grid
“negative-feedback”
you will want to
read this! (rev 5PM
Feb23/03) Spice
models. The resistor
think might be
non-inductive might
not be what you
think. Includes
internal photos of
various resistors.

 

ANTENNAS
and antenna related
topics 

Cebik
and other short
dipoles. feed line
and tuner
analysis!! 

EH
antenna:
the
E-H and CFA
antennas. How they
work. See how
my early theoretical
predictions and
descriptions compare
to actual field
measurements of this
most recent antenna
theory hoax!

If
you think baluns
at the inputs of
tuners
are a
good idea,
go
to this
W7EL link 

and read the section
on current baluns.
You might be
surprised!

Another suggested
tuner link is W9CF.

Balun
and Core Selection
:

(mostly
receiving) Contains
information on core
selection for
transformers and
baluns (it isn’t a
balum) 

Balun,
sleeve baluns:

How a sleeve balun
works and what is
important

Balun,
transmitting:
Testing
transmitting baluns
and untrue folklore
about choke,
voltage, and current
baluns. Dispelling
myth that grabbing
coax adequately
tests a balun 

Baluns:
winding
methods with toroid
cores and debunking
myth that a split
winding improves
performance

Baluns:
Common-mode
noise. How baluns
can help reduce
receiving system
noise

BALUN
TEST:

Test
data on transmitting
baluns. 

Beverages:
Construction,
Endfire Beverages,
Broadside Beverages,
Beverage Arrays for
low band DX and
other low noise
receiving antenna
arrays for 160
meters and other low
frequency bands.
Also see balun
and core selection

for Beverage
transformers.    

Combiner
and Splitters
:

Contains information
on Magic-T splitters
and combiners, how
they work and what
they do




Curtain Array:

Dipole evolution
into Lazy H, Sterba,
and other broadside
curtain antenna arrays

Detuning
Towers:
A
tutorial with an
important correction
of the common error
that we adjust for
minimum
current!! (revised
slightly Feb 17,
2003)

Gain.
Stacking
(Broadside) and
end-to-end
(Collinear) gain.
How it works,
dispelling the 3dB
myth.




Lazy-H antenna:





Evolution of the
dipole into the
Lazy-H and Curtain
Arrays

Loading
Inductors:
A
brief tutorial on
loading coils
(inductors) and
inductor Q

Magnetic
Loop Antennas
:
receiving

Mobile
and Loaded Antennas
:
Loading coils,
ground losses, and
currents in the
system.
Related
page: Inductor
spice model

Power
Stroke Diesel RF
Noise
:
PowerStroke
Diesel noise and how
I corrected the
problem in my 2003
F-250. 

Noise
and common mode
noise. How it gets
into the receiving
system Power
line and other noise

sources

Omega
and Gamma Matching
:

Contains technical
information on Omega
and Gamma matches,
impedance limits,
component selection,
component
failures  

Phasing,
Crossfire
:
Contains
information on
cross-fire phasing
and why cross fire
phasing is superior
for broad bandwidth
low-band receiving
arrays 

Phasing
Systems:
A
quick discussion of
phasing
methods 

Polarization
and diversity:

Think you can have
the best of the two
worlds of vertical
and horizontal?
Think again!

Radiation
and Fields:
 

Electric field,
magnetic field,
Fresnel zone What
the terms we use
actually describe

Radiation
Resistance:

A revised (as of Feb
14, 03) tutorial on
radiation resistance
and how it is used
and misused 

Receiving
and receiving
antenna pages:
Relative ranking of
antennas for Topband
DX plus
various
articles on low-band
DX receiving
antennas…including
low band receiving
antennas such as Beverage
antenna
and
Beverage antenna
construction.
Elongated Loops
and other loop
receiving antennas
such as K9AY, EWE,
and flag antennas,
small Topband or HF
low noise receiving Verticals
, my
receiving antennas

(with a demo), end-fire
or cross-fire
Beverages
, common-mode
noise
in low
noise receiving
systems, and more.



Rhombic Antennas
Rhombic antenna
:
Models and theory of
rhombic antennas and
comparisons of the
Rhombic to a
standard dipole
reference antenna.


Skin
depth:
The
best explanation I
have found

Transmitting:
Contains information
on my various
transmitting
antennas, including
my eight
direction  four-square

Traps:
Measurements and
models of traps,
including Coaxial
and Tribander
Antenna traps

Receivers

Diversity
reception

“diversity”
receiving using
stereo along with
some sound file
examples  

How
I test receivers

Receiver
Tests
of
some transceivers
and receivers. Newly
added 756PRO FT1000
MK V Kenwood TS870
(modified)  

Receiver IM
improvement mods
for FT1000

FT1000D 

DX
Sound files:

What some signals
sound like here

1000MP
MK V
….mods
for FT1000MKV
receiver IM and
transmitter clicks

Key
Clicks

Includes sound
files of signals
with excessive
bandwidth, a
technical
description of what
causes clicks, and
mods for the
FT1000(D) and
FT1000MP.

What
Causes Clicks
….The
technical cause and
what we can do about
clicks.

Keyclick-MP….
An analysis and
patch for the
FT1000MP ‘s infamous
key
clicks  

Keyclicks
1000D
…. An
easy and cheap patch
for the FT1000 and
FT1000D

Keyclicks
1000MP MK V
….mods
for FT1000MKV
receiver IM and
transmitter clicks

Also see Radios.

Noise

Technical article
about noise and
receiving/ receiving
antennas 

Power
Stroke Diesel RF
Noise
:
PowerStroke
Diesel noise and how
I corrected the
problem in my 2003
F-250 

MFJ-1025/1026
Technical
Information

Common-Mode
Noise
issues
with feed lines, and
how to avoid
problems 

MFJ-259B Alignment
instructions and
some technical
information MFJ259B.

MFJ-1025
and 1026 phasing
unit technical
information. 


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Authority

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