【火腿手记】视角｜综测那些事：一个火腿老司机眼中的二手无线电综测购买心得

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老

司

机

电台小叔BG5WKP：

没看到锅身雕的龙吗？

宫廷御膳房用的！

老司机才能拉

来

小叔喊你

戳个小调查

言归正传

今天看看火腿“老司机”

是怎么玩转综测的

Communications Service Monitors – A Radio Hobbyist’s Perspective

从一个爱好者视角看无线电综测仪

作者：Mario Filippi, N2HUN

BG5WKP 朱轶 编译

在过去的几十年里，我因为自己的无线电爱好而执迷于无线电综测仪，但是从几千美元的新型号到成千上万的高端装备，它们的价格总是高高在上。如果不是一个在通信领域摸爬滚打多年的专业人士，看到这样的价格标签，很难下手花如此大笔钱去购买这些综测设备，这不亚于首付买套房。

快进几十年之后，幸运地是这时的生活都变得更好，大家都能买得起房，有稳定的工作且收入稳定，生活因为经济收入而改善。原来几十年前以高昂价格示人的这些老综测生产商（拉姆齐、摩托罗拉、Wavetek, IFR/Aerotek, Cushman）的综测产品最终出现在二手市场上。

电子爱好者们终于能够负担得起这些综测的价格，这些以前在电子行业多年劳作“主力队员”在它们的黄金年代急流勇退，其中很多用途被这群电子爱好者挖掘，通过重新定位使用并改造使得这些二手综测仪器焕发出第二次生命。

Work of Art: Author’s Ramsey COM3 Service Monitor

作者Ramsey COM3综测仪

那么究竟什么是综测，“综测”是人们在贸易往来中提到的那个词吗?可以这么说，综测是给调幅和调频无线电设备维修的仪器，尽管有些设备也有能力检测单边带设备。综测基本上是一个高度精准的信号接收器和低功率信号发生器的合成体，技术员（或电子爱好者）使用它来进行维修或对无线电设备进行校准。

我们大多数人已经拥有对AM和FM广播电台、双工电台如CB(公民频段)电台、寻呼机或业余无线电收发信机的故障经验的判断，而这正是一台综测证明了它的价值和效用所在，因为它，爱好者可以完成好自己的设备维修工作。

My Friend’s Ramsey COM3010 Service Monitor, Big Brother of the COM3

Ramsey COM3010综测，COM3的大哥

我作为一个无线电爱好者（短波、业余无线电、卫星通信）已经超过了半个世纪，拥有电台设备比鞋还多，从AM、FM、短波接收器到CB电台和火腿收发信机，这些来自不同年份不同阶段的闲置设备还都能正常使用。

多年来，我依靠单独的射频信号发生器、音频发生器、频率计数器和亚音频解码器的帮助来排除电台故障，用每仪器对许多的故障机进行了调整，这些单一功能的检测设备可以在我的电台工作室排成一列。

后来有一天，我的一个朋友给我看了他的拉姆齐COM3010综测仪，这是一款值得尊敬的且现在还在量产的主力机型，那时我觉得该做决定买一台综测的时机到了。

Aligning a Uniden President Washington CB Radio Prior to Owning a Service Monitor

用综测对一台Uniden总统华盛顿CB电台进行校调。

我的拉姆齐COM3综测仪是我从互联网二手拍卖网站以400.00美元的价格竞得，产品没什么胡里花哨的功能，基本单元特性撇除了更为复杂的综测配置，仅有内置的示波、频谱分析、扫频能力和频率扫描的能力。

COM3产品在20世纪80年代开始量产，到2003年停产，价格约2500美元(ca 1989)，该产品在当时被誉为是主力机型，产品含内部电池重13磅，方便携带。它涵盖了从100 KHz到999.999 MHz频谱检测，成为我无线电工作室里的一个宝贵的工具，用它测量发射机的工作频率和偏差，测量接收机灵敏度，计校准，检查双工VHF/UHF电台的CTCSS音调。

我的这台综测显然只需要帮我做些正常工作，这些工作包含更换内置电池、执行外部清洁、检查发射机和接收机内部音频发生器精度和检查准确性。

有趣的是，拉姆齐电子(www.ramseytest.com)仍然为已经停产的com3产品提供服务和校准。

Vintage Tempo One Transceiver Restoration Was Made Easier with the COM3 on the Bench

用COM3修复的Vintage Tempo One收发信机

无论是作为一个爱好者或小无线电修理商店的老板，如果一直梦想拥有自己的综测仪，可能会在大量的仪器供应商中寻找，通过正规的产品供应商渠道购买新品并支付一大笔费用，这个费用至少会让你得到某种形式的保证。

如果你想和我一样通过互联网拍卖网站购买，那将面临更多的风险，但是如果你做足功课，通过查阅该网站过去的拍卖记录，卖方反馈分数，通过查看最终成交价并确定该综测的市场能承受的价格，你就可以节省一大笔银子。

最后，COM3所有者手册是可以通过一个简单的搜索在线查询，在1989年8月出版的《73业余无线电爱好者》杂志中作者Larry Antonuk 回顾了拉姆齐COM3综测设备，该文章也可以免费下载。

英文原文：

Over the past few decades I lusted after a communications service monitor for my radio hobby but prices were always prohibitive; several thousands of dollars for a new model and tens of thousands for high-end ones. Not being a working professional in the communications field made it difficult to justify purchasing a piece of equipment whose price tag rivaled a down payment on a house.

So, fast forward a few decades later and now life and times have fortunately changed for the better; the house is paid for, the job is secure, the income is finally steady, life is good financially, and to boot many of these older service monitors manufactured by Ramsey, Motorola, Wavetek, IFR/Aerotek, Cushman etc., are currently being sold on the pre-owned market at a fraction of their original decades-ago hefty prices. These service monitors are finally in financial reach of electronics hobbyists who will find many uses for these former electronic workhorses that toiled many years in the industry and now, in their golden years are being retired and becoming available for a second life via reuse/reincarnation/repurposing/reinvention.

So what exactly is a communications service monitor, or “service monitor” as the folks in the trade refer to? Well it is an instrument for servicing AM and FM radio equipment, although some units also have the ability to service SSB equipment. The service monitor is basically a highly accurate and precise receiver and low-power signal generator all in one allowing a technician (or electronics hobbyist) to perform service, repair, or alignment of radio equipment. Most of us have had the experience of owning a malfunctioning radio whether it is an AM or FM broadcast radio, two-way radio such as a CB (Citizen’s Band) radio, pager, or a ham radio transceiver, and that is where a service monitor proves its value and utility because now you, the hobbyist, can perform the work yourself.

As a radio enthusiast (shortwave, ham radio, satellite communications) for over half a century, I’ve definitely owned more radios than shoes; everything from AM, FM, shortwave receivers to CB radios to ham transceivers, all in different stages of health and vintage. For years I relied on standalone RF signal generators, audio generators, frequency counters, and CTCSS decoders to aid in rehabbing, troubleshooting, and aligning each of the many units that paraded past my radio shack. Then one day a friend showed me his service monitor, the Ramsey COM3010, another venerable workhorse still in production, and it was a defining moment; the time had come to invest in one.

My Ramsey COM3, purchased second-hand from an Internet auction site for $400.00 is a no frills, basic unit without the features found in more sophisticated service monitors having built-in oscilloscopes, spectrum analyzers, frequency sweeping ability, and frequency scanning ability. The COM3 was in production from the late 1980’s to around 2003 at a price of around $2500 (ca. 1989) and was considered a workhorse in its time, weighed 13 pounds with the internal battery, and was easily luggable from site to site. It covers from 100 KHz to 999.999 MHz and has become an invaluable tool in my radio shack for measuring a transmitter’s operating frequency and deviation, measuring receiver sensitivity, S meter calibration, and checking CTCSS tones on my two way VHF/UHF radios. My unit evidently had an easy former life as the only needs were to replace the internal battery, perform an external cleaning, check transmitter and receiver accuracy and check accuracy of the internal audio generator. Interestingly, Ramsey Electronics (www.ramseytest.com) still services and calibrates COM3s.

So, if you’ve been dreaming of owning your own communications service monitor either as a hobbyist or small repair radio shop proprietor then start looking as there are plenty of used units out there; you’ll pay top dollar when buying from a commercial vendor but at least you’ll get some form of warranty. If instead you travel the same road I did, via an Internet auction site, there’s lots more risk involved, but the plus is you’ll save big if you do your homework by checking past auctions, seller feedback scores, and determining what price the market is bearing by looking at the winning bids. In closing, the COM3 owner’s manual is available on line by doing a simple search, and a review of the Ramsey COM3 by Larry Antonuk which appeared in the August 1989 issue of 73 Amateur Radio Magazine is also available as a free download.

source:http://swling.com/blog/2016/06/guest-post-communications-service-monitors-a-radio-hobbyists-perspective/

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