Motorola Bravo classic Service Manual

PAGER HANDBOOK for the Radio AmateurPhilip N. Anderson, W0XI CONTENTS Preface Chapter 1 - Introduction to Paging Chapter 2 -The Defacto Standard: POCS

3 1 19 04 1 20 05 1 21 06 0 22 07 1 23 08 0 24 19 1 25 110 0 26 011 0 27 012 0 28 113 1 29 014 0 30 115 0 31 116 1 32 (LSB) 1Address Codewords "T

Message Codewords The structure of a message codeword is shown in Table 2-5. A message codeword always starts with a 1 (flag bit), followed by 20 mess

Message Formats Two message formats are generally acceptable for POCSAG paging, numeric and alphanumeric. The set of codes for each is defined in the

F [Alphanumeric or general data format Alphanumeric messages are limited to the set of characters included in The CCITT Alphabet No 5 (7 bits per char

CHAPTER3 A TWO-WAY POCSAG OSO It's true; we think of paging as a one-way transmission mode. However, the paging code (protocol) can just as well

transceiver is in the form of audio tones. Each bit of data is represented for a short duration by several cycles of a specific audio frequency. For R

With this in mind, it makes sense, if we're going to have a QSO between stations - rather than a one-way transmission to an actual pager, to use

How about the improvements? I'd combine the P AGEMON and PAGE commands into a POCSAG command. Like R TTY then, we could use control characters to

CHAPTER 4 DIGITAL PAGERS: RECEIVER AND DECODER The vast majority of digital pagers sold today are designed to receive Radiopaging Code No. 1 (POCSAG).

Part No. UHF Receiver Board Frequency Range MHzNRE6550B 406-423NRE6551B 435-450NRE6552B 450-465NRE6553B 465-480NRE6555B 495-512Most paging receivers a

PREFACE The purpose of this handbook is to introduce paging technology to the radio amateur. We'll describe the Radiopaging Code No.1, also known

foscillator . multiplier = fcarrier - IF or rearranging, foscillator = (fcarrier - IF) / multiplier Let's assume that the pager maintenance manua

MULTIPLIED to obtain the signal needed at the first mixer. As mentioned in the previous paragraph, the 4052 receiver board is capable of supporting an

In most cases it's possible to convert other boards, such as the 4052A board - which is just above the 2-meter band ˆfor VHF use. In order to mee

CHAPTER 5 BUYING A PAGER FOR AMATEUR RADIO USE You have three choices in selecting a pager for 2-meter or 70-cm amateur use: buy one already cry stall

So, chances are you'll be able to convert them. However, since I've not done that, take my suggest with a grain of salt; that is, you are on

necessary RF test equipment and pager programmer. There is one final option: if your club plans on programming a lot of pagers, you might consider sta

CHAPTER 6 RECRYSTALLING, REPROGRAMMING Assuming your pager is new, refurbished, or used and appears to be working, it's time to recrystal it to m

435-450 45.0 8 48.75-50.625Table 6-2: Kantronics Pager Crystal Bank(fax 913-842-2031, website http://www.kantronics.com/)Carrier MHz IF MHz Multiplier

Figure 6-1: VHF Receiver Board AARD405X Seriestuning up the pager Once you've placed the receiver board back in the pager, you're ready to t

Table 6-3: Recrystalling Tune-Up Procedure (for Bravo-series pagers)step procedure1 install a 1.5 V batter in the pager2put the page in self-test mode

when technologies are mixed. I'll leave you with this thought to get your creative juices going: We've discovered that some of the packet &q

Table 6-4: Five Pagers Recrystalled for 2-meters (from 152.840 to 147.650 MHz)unit baud rate receiver board generator RTF pad* sensitivity1 512 AARD40

CHAPTER 7 SETTING UP A PAGING SYSTEM Now that you have the basics of paging under you belt, it's time to assemble and operate an amateur paging s

opposite is true. The carrier is never returned to its center or "operating" frequency. For example, if a numeric page is sent that contains

(pot) and J7 set on both pins produces sufficient deviation for POCSAG activity. It's a good idea to use a deviation meter to check your setting.

1234568 is the capcode or pager ID (3) denotes the page as alphanumeric the date and time are optional (added at the time of reception). A detailed ex

CHAPTER 8 KPC-9612 PAGING COMMAND SET The Kantronics KPC-9612 packet modem became a POCSAG encoder/decoder with the addition of the paging commands ad

pagelog (as a potential callback message). Alphanumeric pages may contain as many as 128 characters. If -A is specified when entering the PAGE command

This command is used to force a CWID after each page or n minutes after a page. If n is set to 0, the command is set to OFF. The message contained in

W0XI Phil 111222WK5M Karl -A -512 -P 1115555-N and -1200 are defaults. see also: pagepswd, pagepriv PAGELOG {njLIST|CLEAR} (maximum value of n depends

PAGER> 111222(0): 842-7745 PAGER> 111222(0): 842-5115 On the first line, 111333 displays Karl's capcode and the (3) denotes an alphanumeric

CHAPTER 1 INTRODUCTION TO PAGING Commercial pagers have become super popular in the last decade, competing strongly with the cellular phone. Applicati

inverted, set PAGEXINV to ON. The setting of the command has no affect on page monitoring. When monitoring, the KPC-9612 looks for pages sent in the n

ENTER COMMAND: B, D, L, P, Password, or Help>L W0XI>111222 -N -1200 02/25/9613:00 8427745 ENTER COMMAND: B, D, L, P, Password, or Help>B If m

APPENDIX 1 GLOSSARY OF PAGING TERMS Address Codeword - A 32 bit codeword used to carry the address (capcode) of a pager. It's like the address la

RPCl (POCSAG) is by far the most popular code used now, although GSC is found in some cities. IF - Intermediate frequency. Most pagers make use of a f

Programmer - In paging, this refers to the device (computer or stand alone box) that is used to enter capcode and other defining parameters into a pag

APPENDIX 2 FREQUENCY TABLES This appendix contains four tables of readily available crystals listed by frequency of reception for pager use: VHF high

152.1200 152.8400152.1500 153.2600152.1800 153.3500152.2100 153.6050152.2250 153.7100152.2400 153.7850152.3750 153.9000152.4200 154.1300152.4800 154.1

157.7400158.0001158.1000158.1200158.3400158.6701158.7531158.7751159.3251Table A-2: UHF Band445.6000 454.3500445.6750 454.3750445.8250 454.4000445.9500

454.1250 454.6500454.1500 454.7250454.1750 454.7500454.2000 455.5000454.2250 456.3750454.2500 456.9800454.2750 457.5750454.3000 457.9750454.3250 460.6

464.3750464.5500464.6125464.7000464.9750465.0000Table A-4: '900' MHz929.0125 929.5875929.0375 929.6125929.0625 929.6375929.0875 929.6625929.

message. Your touch-tone phone and the telephone company's equipment does the rest. The paging terminal has other jobs too. It must keep track of

929.4375 931.0125929.4625 931.0375929.5125 931.0625929.5375 931.0875929.5625 931.1125931.1375 931.6875931.1625 931.7125931.1875 931.7375931.2125 931.7

931.5625931.5875931.6125931.6375931.6625

APPENDIX 3A TYPICAL DIGITAL PAGER SPECIFICATIONbattery 1.5 Vdc, 'AA'battery lifetime>2500 hours @ 512>2000 hours @ 1200code CCIR RPC1

APPENDIX 4 SENSITIVITY TABLE A 512 baud POCSAG pager is often specified to have a sensitivity of about 4 microvolts per meter (uV/m); that is, it shou

BIBLIOGRAPHY Anderson, Phil, "Ham Radio Paging: Putting 'POCSAG' on Packet," CQ VHF, July, 1996, p 12. Cameron, Dennis, "Part

Stewart, Lynne, "Paging Technology: Systems and Services," MRT, February, 1996. Tesh, Robert, How the Golay Code Affects NEC Pagers, MRT, Oc

these paging formats will be covered in this handbook.Figure 1-2: Amateur Paging System 2-meters or 70-cm.You might wonder at this point how this all

CHAPTER 2 THE DEFACTO STANDARD: POCSAG Introduction The single purpose of this chapter is to describe the Post Office Code Standardization Advisory Gr

you are responsible for any code you write. POCSAG CODE or Radiopaging Code No. J A page transmission consists of a preamble and batches of codewords,

transmitted with the most significant (MSB) bit first. The SC is $7CD215D8 (hex), and the idle codeword is $7A89C197 (hex). The SC and idle codewords