Service manuals for the. The Basic Service Manuals are however available for download from. The Customer Programming Software required to configure a. Last changed: May 27, 1998 Add a Plectron or Motorola Alert Desktop Monitor Receiver to Your Scanner Collection by Bob Parnass, AJ9S [NOTE: This article may not be reproduced in whole or in part on CDROMS, in bulletin boards, networks, or publications which charge for service without permission of the author.] In the 1960s and 1970s, thousands of firemen and ambulance squad members came to rely on their crystal controlled, transistor Plectron and Motorola desktop monitor receivers. They have now been replaced by battery operated portable pagers, and the desktop models are often available at hamfests in the $5 - $25 range. Since many are in rough condition and need repair, a hamfest special is better suited for hobbyists who like to fix their own radios. Plectron and Motorola crystal controlled receivers are excellent for dedicated monitoring of local frequencies -- a task for which you wouldn't want to tie up your 400 channel programmable scanner. They are desktop models which can be powered from 117VAC or 12VDC with the proper mobile cord. The audio quality of a Plectron P1, Plectron 700 series, and Motorola Alert Monitor is far better than any consumer grade scanner and the sensitivity, image rejection, and intermod immunity is outstanding when aligned properly. JOHNSON DUO SCAN Crystal Scanner Base or Mobile High and Low Bands 8 Channels JOHNSON MINISCAN Crystal Scanner. PLECTRON R8190AC2 Pager-Monitor Base or Mobile Low Band Only Single Channel PLECTRON R8200 Pager-Monitor Base or Mobile High Band Only 2 Channels PLECTRON SM312 Crystal Scanner. Dec 20, 1997 - hands of time and listen to program segments from many of short waves. Zte drivers windows 7. 148-174 R8200 R8160. You can also obtain Plectron repairs and parts from. Brands, but they don't sell manuals or schematics. Kamu bisa mengetahuinya dengan mudah melalui ukuran (size) flashdisk tersebut. Setelah itu tancapkan flashdisk di PC, dan setelah terdeteksi buka Run ( Win + R) -> ketikkan diskpart -> Enter Window CMD diskpart akan terbuka, ketikkan list disk -> Enter Lihat Disk berapa USB flashdisk kamu. Pertama siapkan dulu USB flashdisk yang akan digunakan beserta file ISO installer Windows. Cara cloning windows xp tanpa software store free. Jer serienjunkies captcha erkennung. Models and Frequency Coverage The Plectron and Motorola Alert monitors are single band receivers: VHF-low, VHF-high, or UHF. No single Plectron or Motorola Alert monitor can cover the entire 30-50 MHz band, so there were versions optimized for each portion of the VHF-low band. There were different versions to cover low and high 'splits' in the VHF-high band, too. For example, low band R8000s come in 30 - 35, 35 - 39, 39 - 49, and 49 - 54 MHz versions. There are two VHF high band versions of the 700 and R8000: 148 - 158 and 158 - 175 MHz. VHF-low band Motorola Alert monitors come in two splits: 30 - 42 and 42 - 54 MHz. Although UHF versions of the 700 series were made, they are somewhat rare and coverage is limited to 470 MHz and below. Plectron made several models with dozens of different options. Both the original P1 and later 700 series are suitable for restoration, although I prefer the newer 700 models. The 8000 series were even newer and very desireable, but they are difficult to find at hamfests. The Plectron 500 'economy' series is less desirable. The P1 series have black cabinets with a blue-green and silver color scheme used on the front panel. They were made in the Chief (tone decoder & carrier squelch), Patrol (carrier squelch only), and Sentry (tone only) models. The Sentry models lack a carrier squelch and therefore are of little use to hobbyists except for scavenging parts. Model number and frequency information appears on a gummed label on the rear panel: Band (MHz) Chief Patrol Sentry ____________________________________ 25-54 R19 R15 R17 148-174 R20 R16 R18 450-470 R23 R21 R22 Table 1. Plectron P1 models The R700 series have black cabinets with brown front panels and are slightly smaller than the P1 receivers. Plectron 8200 Service Manual Programs FreeR700s were made in the Chief (tone decoder & carrier squelch) and Patrol (carrier squelch only) models: Band (MHz) Chief Patrol ___________________________ 25-54 R719 R715 148-174 R720 R716 450-470 R723 R721 Table 2. Plectron 700 models The R8000 series are much smaller than the P1 and R700 and are housed in metal cabinets of various colors. The R8000s use the same MC3357 IF/detector/squelch IC used in crystal scanners, but their crystals are not interchangeable with ordinary scanners. R8000s were made in the Chief (tone decoder & carrier squelch) and Patrol (carrier squelch only) models: Band (MHz) Chief Patrol ___________________________ 30-54 R8190 R8150 148-174 R8200 R8160 Table 3. Plectron 8000 models The Plectron FM Receiver/Recorder is a collector's item. It is essentially a 700 series Chief receiver with a built in cassette tape recorder. The recorder is carrier activated and can tape transmissions while the receiver is unattended. A connector on the rear panel allows for all kinds of remote control possibilities. I use two Plectron P1s and four R700s in my living room, seven R700s down the ba***t, and several Plectrons and Alert Monitors stored in reserve. The ba***t Plectrons are turned on automatically when someone walks downstairs. Power to them is controlled by a modified Radio Shack Safe House infrared motion detector, originally sold as an intrusion alarm. When a rescue squad member from Missouri advertised a number of Plectrons on USENET, I bought them -- all 20+ of them. I cleaned, fixed, and restored each one. After recrystalling them on local frequencies, I distributed them to members of my scanner club who were glad to get them. Both brands of receiver require special crystals. I sometimes use Radio Shack's generic 3rd overtone scanner crystals in the Plectrons but they oscillate on frequencies far away from their marked frequencies. That's because the Plectron oscillator is designed to be used with a crystal which oscillates on its fundamental, not overtone, frequency.
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