Text: Red Radio Waves in 2005
Military aircraft belongs to military equipment, and it does have its advantages, such as material options, debugging and testing, design and manufacturing, etc., which are much higher than the requirements of civilian equipment in the same period!
In terms of circuit design, ordinary civilian receivers use high-frequency one-time tuning, one-time frequency conversion, triode nonlinear mixing, no more than three-stage intermediate frequency amplification, ordinary diode large-signal detection, and more than 100 decibels of the whole age gain have basically met the requirements of use, and the design of military receivers may not be the case, because military aircraft reception must take into account various special and harsh factors of its receiving environment, such as remote areas with weak signals, enemy electromagnetic interference, etc., in these special, In the harsh environment, it is necessary to ensure the effectiveness of the military aircraft's reception as much as possible, therefore, multi-level tuning and high amplification, multiple frequency conversion of the second or more than two times, balanced mixing, synchronous detection, controllable high-gain amplification, etc., have become routine considerations in military aircraft!
Similarly, in order to ensure the special use environment of military aircraft and the characteristics of possible mobile use, in the design of military aircraft, it is necessary to ensure a certain degree of mechanical strength and to consider reducing the weight of the military aircraft as much as possible; therefore, the selection of materials for the manufacture of military aircraft is relatively sophisticated and special, for example, the aluminum metal shell is a design that is relatively difficult to consider on civilian receivers! At the same time, in order to ensure the reliable performance of military aircraft during the war, the options of various electronic components on military aircraft are also relatively much more demanding than those of civilian receivers!
In the final analysis, because of the requirements of military use, the highest receiver manufacturing technology of the military aircraft was widely used in the design and production of military aircraft, so its performance compared with civilian receivers in terms of receiving performance, mechanical strength, manufacturing technology, and service life are far beyond civilian aircraft, and it has also infiltrated the advanced consideration of technology!
However, after the seventies of the last century, the speed of development of electronic technology is indeed shocking, many new device materials and technical theories are very quickly generated, developed and maturely applied, low power consumption, miniature, high integration gradually dominates the development direction of electronic technology, at the same time, the development of space/space technology, the military has also been rapidly developed, the original simple voice intelligence transmission has been far from meeting the requirements of the times, multi-information, multimedia form of high-speed intelligence transmission has become the new era of military communication requirements! Therefore, the old-fashioned military aircraft in this period, no matter from that point of view, are backward and outdated!
For example, many parameters of the components in the military aircraft that have been strictly selected in those years were very good, but today, after the development of semiconductors, it is possible to choose a transistor with a modern process at will, and its performance will far exceed those selected transistors in the past......
Electronic theory has proved that the parameters of the components determine the performance of the overall circuit to a large extent, therefore, the components have been greatly developed today, and the performance of the receiver manufactured by the current process is bound to exceed those of the previous receiving equipment, including military aircraft!
But in fact, the improvement of component parameters has made the whole machine production simple and simplified, and this simplification of the whole machine production is excessive, therefore, it gives people the illusion that many modern receivers are inferior to the old receivers of the past! I once seriously compared the 139B military aircraft and the DE1103 radio of modern technology, and the DE1103 radio can be said to be a non-simplified receiver under the current technology, and its secondary frequency conversion, MOSFET balanced frequency mixing...... After comparison, the 139B receiver needs to pull up an outdoor short-wave antenna of about 10 meters, and its reception performance can be basically equivalent to that of DE1103 directly using an indoor rod antenna!
As for other military aircraft, I don't know very well, the 222 electronic tube military aircraft has been roughly played in the Shenzhen network in the company, its reception performance in the indoor feeling is not very special, and the feeling and DE1103 are at most just equivalent! Of course, other multi-frequency conversion and compared with the later military aircraft, its reception performance may be better, I hope I can personally experience it in the future! As for other modern radios, I don't dare to think that their reception performance can surpass that of military aircraft, because these radios are really too simplified, and to a large extent, they are not even as good as the old ones!
It is precisely because modern radios have been oversimplified for many reasons, and although military aircraft are outdated in today's era, the surviving reception performance still fascinates many radio enthusiasts! Therefore, there are many friends on the altar who like military aircraft, and from their words, they can understand their military aircraft complex, or they have formed an indissoluble bond with military aircraft; or they praise the exquisite craftsmanship of military aircraft, and they praise the excellence of military aircraft production; or they still receive military aircraft and sigh at the superb performance of military aircraft!
They placed the military plane at the head of the bed and in front of the desk, bought an interline transformer from the Hong Kong people, connected it to a loudspeaker, listened to it day and night, stared at the frequency indicator window with lights, and praised it greatly; even as for what was said in the program they received, they probably did not understand it, and there was no need to understand it, and there was only one thing they wanted to understand and experience in their hearts, that is, listening to the military plane, it was cool and crooked! As for how cool it is, each person's feelings are different! You must not oppose these friends, because the freedom they feel is very sacred!
Editing + Illustration: Radio Review Translation Source: Radio Forum
I would like to express my sincere gratitude to the predecessors of "Red Wave" for their selfless sharing!