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NHRC-2 User Guide

Page 1

2/28/2000

NHRC-2 Repeater Controller

User Guide

Rev D PCB only

Contents

1. Installation

1. Electrical Connections

2. Adjusting the Audio Levels

3. Initializing the Controller

2. Programming

1. Controller Modes

2. Programming the Controller

1. Programming the Timers

2. Programming the CW Messages

3. Programming the Flag Bits

4. Recording the Voice Messages

3. Enabling/Disabling the Repeater

3. Operating

1. About the IDs

2. The Tail Message

3. Using the Tail Message as the Courtesy Tone

Index of Tables

•

Configuration Flag Bits

Summary of Contents for NHRC-2

Page 1: ...Adjusting the Audio Levels 3 Initializing the Controller 2 Programming 1 Controller Modes 2 Programming the Controller 1 Programming the Timers 2 Programming the CW Messages 3 Programming the Flag Bi...

Page 2: ...rd Layout 1 Installation 1 Electrical Connections The controller uses a female DB9 connector P1 for all signals It requires receiver audio and a signal present indication CAS from the receiver supplie...

Page 3: ...y tinny unnatural sound to it To de emphasize the receiver audio on the controller board install a 0 0068uF capacitor in position C3 change R3 to 51K and change R4 to 510K These values should be consi...

Page 4: ...at no more than 250mA of current be drawn through it because the trace on the PC board is somewhat narrow 2 Adjusting the Audio Levels Preset all potentiometers to midrange Connect an oscilloscope pro...

Page 5: ...repeaters Normally when using link controller mode the hang time is set to 0 seconds and the controller is programmed to suppress DTMF muting so the user s DTMF commands will appear on the input of a...

Page 6: ...s pairs of hex digits to represent 8 bit values for the address and data of programming information Any decimal number from 0 to 255 may be represented by two hex digits Hex digits are 0 1 2 3 4 5 6 7...

Page 7: ...timer address and 64 is the hexadecimal value for 100 which would be 10 0 seconds 2 Programming the CW Messages CW messages are programmed by storing encoded CW characters into specific addresses in t...

Page 8: ...ltiple flag bits can be selected by summing their hex weights For instance to set up a link controller with no ISD1420 no courtesy tone and suppress the DTMF muting you would add 01 10 and 20 to produ...

Page 9: ...ontrol by setting the value in location 00 Set this location to zero to disable or non zero to enable For instance to disable the repeater send command pppp0000 To enable the repeater send command ppp...

Page 10: ...0 Program the tail message counter value into address 05 3 Using the Tail Message as the Courtesy Tone The tail message can be used as the courtesy tone if bit 6 is set in the configuration flags In...

Page 11: ...enable flag 01 00 configuration flags 02 32 hang timer preset in tenths 03 1e time out timer preset in seconds 04 36 id timer preset in 10 seconds 05 00 tail message counter 06 0f O OK Message 07 0d...

Page 12: ...17 29 18 0a R 19 ff EOM 1a 00 can fit 6 letter ID 1b 37 not used 38 n a isd message 0 length in tenths 39 n a isd message 1 length in tenths 3a n a isd message 2 length in tenths 3b n a isd message 3...

Page 13: ...r Morse Code Binary Encoding Hex Encoding sk 01101000 68 ar 00101010 2a bt 00110001 31 00101001 29 0 00111111 3f 1 00111110 3e 2 00111100 3c 3 00111000 38 4 00110000 30 5 00100000 20 6 00100001 21 7 0...

Page 14: ...00010000 10 i 00000100 04 j 00011110 1e k 00001101 0d l 00010010 12 m 00000111 07 n 00000101 05 o 00001111 0f p 00010110 16 q 00011011 1b r 00001010 0a s 00001000 08 t 00000011 03 u 00001100 0c v 000...

Page 15: ...as the 0 1uF bypass caps are non polarized and do not have a square pad They may be inserted either way Note Double check your work tantalum capacitors may explode upon power up if they are inserted b...

Page 16: ...k after assembly and your finished product will look professional 12 Double check your work Check for any unsoldered parts solder bridges or improper part placement You are now ready to apply power to...

Page 17: ...locks however neither part comes with jackscrews These are available separately using Newark P N 50F4689 Keystone 7228 0 24ea Some kit builders have reported that the AMP Amplimite 754781 4 Digikey A...

Page 18: ...a receiver used in a repeater because the audio there is not subject to level changes caused by the volume control In many radios the de emphasis filter is downstream of the volume control which makes...

Page 19: ...board Remove the ammeter and re apply power With all of the chips still removed check for 5 volts at pin 3 of U4 LM7805 pin 14 of U1 PIC16F84 pin 28 of U2 ISD1420 and pin 18 of U3 M8870 If any of the...

Page 20: ...d rise to about 5 volts when the controller turns PTT on If not verify the CAS signal is working then examine the section in this document on a completely dead controller When PTT is turned on the gat...

Page 21: ...9 C10 C11 C14 and C17 The tantalum caps have a very low ESR effective series resistance The use of any other type of cap will cause the output of the op amp to sit at the rail 12v Voltages around U5 L...

Page 22: ...isy The leading cause of noise on recorded messages is improper bypass caps on the power supply leads around the 7805 and the ISD1420 Be certain that C13 is installed properly and is a minimum of 220u...

Page 23: ...R CAS VCC VCC VCC VCC VCC VCC VCC VCC VDD VCC VDD VCC VCC VCC VCC VCC VCC VDD C25 0 1uF 1 2 R22 300K 1 2 R21 470K 1 2 R18 39K 1 2 C12 4 7uF 1 2 R31 10K 1 2 R30 1 5K 1 2 Q6 IRF510 1 2 3 R29 100 1 2 U2...

Page 24: ...D R4 TO 100K FOR FLAT AUDIO RESPONCE B NHRC 2 Audio NHRC Repeater Controllers 444 Micol Road Pembroke NH 03275 603 485 2248 B 2 2 Monday February 28 2000 http www nhrc net Title Size Document Number R...

Page 25: ...ee note 1 4 1 C12 4 7uF 4 7uF 50V Aluminum Electrolytic Cap Panasonic ECA 1HM4R7 P5177 ND 0 21 5 1 C13 220uF 220uF 25V Aluminum Electrolytic Cap Panasonic ECA 1EM221 P5153 ND 0 41 6 2 C15 22uF 22uF 25...

Page 26: ...esistor Yaego CFR 25JB 5K1 5 1KQBK ND 0 06 28 1 R29 100 100 5 1 4W Carbon Film Resistor Yaego CFR 25JB 100R 100QBK ND 0 06 29 1 R30 1 5K 1 5K 5 1 4W Carbon Film Resistor Yaego CFR 25JB 1K5 1 5KQBK ND...

Page 27: ...quent times is completely at the discretion of NHRC LLC and may require the complete return of the kit In no case will NHRC LLC be liable for products damaged by improper wiring including but not limi...

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