Hal Communications ID-1A, Instruction Manual

Page 1: ...HAL COMMUNICATIONS CORR BOX 365 URBANA ILLINOIS 61801 QUALITY COMMUNICATIONS EQUIPMENT...

Page 2: ...hall be in lieu of all other warranties whether expressed or implied and of all other obligations or liabilities on the part of HAL Communications Corp resulting from the installation or use of this i...

Page 3: ...2 VI Parts List 18 TABLES AND ILLUSTRATIONS 8 9 Table 1 Character Codes Table 2 Coding the Memory for DE WB9XYZ Figure 1 ID 1A Circuit Board Layout 4 Figure 2 Coding Chart for DE WB9XYZ 11 Figure 3 Bl...

Page 4: ...g interval only the initial identification is transmitted This feature prevents the unnecessary repetition of the call sign if the repeater is trig gered briefly by a noise burst or by a short call to...

Page 5: ...ion message is transmitted the memory is read out one character at a time The memory output is supplied to a character generator which reconstructs the code charac ters with precise weight and spacing...

Page 6: ...ng and testing the ID 1 can be mounted most con veniently by simply gluing it to one side of the cabinet Scotch spray adhesive Elmer s white glue or some similar cement is adequate The input and outpu...

Page 7: ...o t r Timer Length Strap Fig l Component Layout Speaker HAL Communications 10 lA Identifier...

Page 8: ...n the page control line is grounded the identification will be delayed until the line is released The state of this control line does not affect the internal timer If the line is used bypass it with a...

Page 9: ...step 5 of the previous example 6 In the receiver locate the relay which closes when messages are being received Con nect the page control line to an unused contact ground the other contact of the pai...

Page 10: ...the identifier emits a very short fast burst of code characters check the 47 ufd capaci tor in the master clock circuit 3 If the above steps have not isolated the problem press test switch A again Af...

Page 11: ...1 indicates the presence of a diode 0 indicates the absence of a diode Note that the keyer automatically produces a short space equal in length to a dot after each dot or dash No separate code charact...

Page 12: ...aracter Space Space Dash Dot Dot Space Dot Space Space Space Dot Dash Dash Space Dash Dot Dot Dot Space Dash Dash Dash Dash Dot Space Dash Dot Dot Dash Space Dash Dot Dash Dash Space Dash Dash Dot Dot...

Page 13: ...ered Be sure that the diode cathodes connect to the printed conductors on the bottom of the circuit board It pays to carefully recheck your work at each stage of the process to guard against wiring er...

Page 14: ...Fig 2 Coding Chartfor DE WB9XYZ I l 0 0 0 0 0 0 0 0 0 0 Fig 3 Blank Coding Chart 11...

Page 15: ...bed in a later section The timer chain which establishes the time interval between successive transmissions of the coded message consists of a chain of frequency dividers The 60Hz power line waveform...

Page 16: ...s connected between the row and column lines at a given location the bit for that location is read out as a 1 If no diode is present the bit is read out as a 0 The memory readout process is controlled...

Page 17: ...ts are high only when an end character is encountered The clock then stops The master clock drives two flip flops which divide the clock frequency by two or four depending on the state of the memory o...

Page 18: ...I I I I I Il_f I I I I I I Flip flop A output pin 5 ckt 10 NAND gate output pin 6 ckt 9 Fig 4 Generating a Dot Flip flop A output pin 5 ckt 10 Flip flop B output pin 9 ckt 10 NAND gate output pin 6 ck...

Page 19: ...be adjusted by the 500 ohm tone potentiometer An inverting amplifier is used to isolate the oscillator from its load The amplifier drives the speaker and via the audio output jack the transmitter aud...

Page 20: ...hove finished by the time the identification has f inished toTX Relay l N 2 L 1 All resistors l 4W lQ o 2 All capacitors in JA fd voltoge rating 3 All diodes 1N270 orequiv 4 All unmarked arrows ore 5...

Page 21: ...strip 4 phono jack 4 phono plug 1 phone jack 1 phone plug 18 Capacitors 11fd s 1 01 50V disc ceramic 1 1 25V disc ceramic 2 22 12V disc ceramic 2 2 2 16V electrolytic 1 47 16V electrolytic 2 100 25V e...