"MAGIC" PERFORMED BY THE CONJUGATE MATCH
- When the CONJUGATE MATCH is introduced into the picture, the SWR can
be so high as to be unacceptable by almost any CB technician's standards
(3:1, 4:1, EVEN 5:1) and still offer
NO
SIGNIFICANT LOSS of signal over that of a perfect 1:1 match ,
IF FEED LINE ATTENUATION IS LOW!
- If a Conjugate Match is achieved,
IT IS NOT
NECESSARY FOR THE ANTENNA RADIATOR TO BE CUT TO RESONANCE to
obtain maximum resonant current flow.
- The feed line need not be a special length as any random length of
low-loss feed line will give excellant results.
- Even though the SWR is quite high which, of course, means that there
is a high amount of reflected power on the feed line,
NONE OF THAT REFLEFCTED POWER WILL REACH THE
TRANSMITTER to cause damage to the final or any other parts in
the transmitter.
WITH THE EXCEPTION TO THE POWER LOST BECAUSE OF
FEED LINE ATTENUATION, ALL of the power that is supplyed by
the transmitter will be radiated by the antenna REGARDLESS OF THE SWR. This is, of course, the
reason for the first statement above. In other words, if the SWR is 5:1
and all of the power being fed to the feed line is already being
absorbed and radiated by the antenna, there can not possibly be a
significant improvement in radiated field even if the SWR is lowered.
- The Conjugate Match, as referred to above may be effected at the
transmitter end of the feed line
WITHOUT ANY
SIGNIFICANT LOSS over matching at the antenna end, which
offers much more flexibility as regarding the bandwith of the system.
Stated in another manner, if the Conjugate Match is effected at the
output of the transmitter, the antenna NEED NOT BE A
BROADBANDED ANTENNA in order to be used over a very wide range
as compared to using the same antenna without the aid of the Conjugate
Match. This is so because it is relatively simple to retune for the
conjugate match at the transmitter end of the feed line but would be
considered rediculous to do the same thing at the antenna
end--especially in the situation where the antenna is a few dozen feet
in the air. |
