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『太平洋电脑网』为什么老年人难以理解当今的科技究竟有发达？( 二 )


Color TV
彩色电视机
TV Repairman
电视修理工
That’s what got me interested in electronics. Two neighbors were amateur radio operators. One was a women who used it to talk to her husband, serving in Vietnam. That’s what got me interested in amateur radio. In junior high school, our “industrial arts” department had more than just the traditional wood shop and metal shop. It had an electrician shop (including a wooden telephone pole to climb, and a power transformer at the top), and an electronics shop. The electronics shop started at the beginning of broadcast radio, and ended with an AM and Shortwave radio. The building had a long outdoor wire antenna, just like what was used when broadcast radio was first invented, in the ‘20s.
这使得我对电子学感兴趣 。 我的两个邻居都是业余无线电操作员 。 其中一位是个女士 ， 她通过无线电和在越南服役的丈夫通讯 。 由此 ， 我也产生了对业余无线电的兴趣 。 在初中学校 ， 我们的“工艺美术”系不仅仅配有传统的木工车间和金属加工车间 ， 还有一个电工车间(包括一个可供攀爬木制的电话线杆 ， 顶部还有一个电源变压器)和一个电器商店 。 这家电器商店始于广播电台兴起之时 ， 在调频广播和短波无线电通信的时代关门 。 这座大楼顶上有一根很长的天线 ， 就像无线电广播在20年代刚刚被发明时所使用的一样 。
Old ham radio
老式业余无线电设备
Ham Radio Tower
业余无线电电塔
o MY first radio was a “crystal” radio, built on a breadboard, using the power of the radio broadcast to put the sounds into a crystal headset.
我的第一台收音机是台矿石收音机 ， 建立在一块底板上 ， 利用无线电的力量把声音传送到耳机里 。
Breadboard tube radio experiment.
板管收音机试验
o Then, I added a vacuum tube diode, to make it more reliable.
o A vacuum tube triode added amplification, to make it more sensitive (to hear weaker radio stations). New circuitry made it more selective (to separate the different stations).
o Another vacuum tube was added to make the sounds strong enough to drive a loudspeaker. So, I had a three-tube radio that I built from scratch, just like what people used in the ‘30s.
o Finally, I bought a kit that would become a five-tube radio, operating on the AM broadcast band (to hear local stations), AND on an international shortwave band (to hear broadcasts from other countries).
然后 ， 我添加了一个真空二极管 ， 使它更可靠 。
添加一个真空三极管增加放大率 ， 使它更加灵敏(接收更微弱的广播电台) 。 新的电路使它更有选择性(划分不同的广播电台) 。
第三个被添加的真空管 ， 用来使声音大到足够驱动一个扩音器 。 这样 ， 我有了一个我自己亲手制作的三管收音机 ， 它就跟30年代的人使用的一样 。
最后 ， 我买了一套能让它变成五管收音机的设备 ， 能接收到AM广播波段(听当地电台)以及国际短波波段(听其他国家的广播) 。
Vacuum Tube Kit Radio
成套电子管收音机
In high school I went to computer programming class to learn how to program our school district’s IBM mainframe computer (which was downtown at school district headquarters) in FORTRAN (one of several languages used on mainframes, the ancestors of today’s C++). The programs were punched onto paper cards, with a key-punch machine we stole from the business department. Each card was one line in the program (such as IF X=5 THEN GOTO 15). The program results came back on wide computer paper (computer monitors were very rare, green characters on a black screen, and only in the computer center, to control the computer). We sent one program per week, on Friday, in a big box. Our programs were run in the middle of the night on a weekend, when computer time was cheapest. The print-outs came back on Monday. Networking hadn’t been invented, yet.


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