Hal Communications AK-1 Instruction Manual Download Page 1 | Manualshive

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Summary of Contents for AK-1

Page 1: ......

Page 2: ...I HOJ Y111 SO ltS IY v l j...

Page 3: ...wiring or components which in the judgement of HAL Communications Corp were damaged by incorrect use or construction on the part of the kit builder This warranty is and shall be in lieu of all other...

Page 4: ...hotograph of AK 1 Circuit Board Figure 4 Typical Connections to AK 1 Figure 5 Direct TTY Keyboard Connection to AK 1 Figure 6 AK 1 Connection to Tube type Demodulators Figure 7 Direct Loop Connection...

Page 5: ...utput signals from the HAL Communications ST 6 and ST 5 demodulators and can be easily keyed from other sources of low voltage serial teleprinter data Both hig and low level audio outputs are availabl...

Page 6: ...125 Hz 2295 Hz 2975 Hz 2225 Hz 100 mV rms 20 mV rms Frequency Stability after 15 minute wa up 5 Hz all tones Standard Frequency Shifts available 170 and 850 Hz Input Keying Voltage Requirements Mark S...

Page 7: ...n that for mark condition the voltage should be zero or less preferably between 5 and 15 volts and greater than 5 for space condition Therefore during mark Ql is off as is Q2 and the effective chargin...

Page 8: ...2125 and 31 dB down at 6375 Hz 3 X 2125 This check is not normally required and should only be necessary if problems occur Two outputs are provided from the AK 1 an attenuated high impedance output of...

Page 9: ...location for each before soldering it in place The watt fixed resistors can now be mounted in the locations indicated ALL resistors are mounted in a vertical position with the body of the resistor pla...

Page 10: ...Whatever the source the 12 volts furnished to the AK 1 should be well filtered free of hum and noise and reasonably well regulated zener regulation is quite adequate The circuit board of the AK 1 shou...

Page 11: ...as shown with a keyer tube that normally operates with a grounded cathode and with the printer and keyboard in series in the plate circuit A voltage proportional to the loop current is obtained with...

Page 12: ...11 to drive high impedance microphone inputs of transmitters To avoid hum and excessive cable capacitance the audio cables between the AK 1 and the transmitter should not be longer than three feet Th...

Page 13: ...set of spectra will be generated to each stage It is therefore apparent that introduction of two discrete audio tones into a SSB transmitter has resulted in the generation of two discrete radio frequ...

Page 14: ...his is obviously controlled by power level distance between transmitter and receiver receiver sensitivity and a lot of other hypothetical considerations the most practical approach is to reduce any sp...

Page 15: ...e required Although this is at first very attractive it has the following serious defects 1 The carrier suppression is the same as for voice not necessarily desirable as discussed earlier 2 Harmonics...

Page 16: ...ricted to 300 to 2400Hz This can generally be cured by changing the audio circuit slightly usually a capacitor th the coupling circuits between stages or by pre emphasis of the tones As discussed earl...

Page 17: ...r it is determined that the AK 1 is functioning correctly the frequencies of the tones should be checked with a frequency counter The counter should be connected to the 100 mV output Note that some co...

Page 18: ...s determined that supply voltages and currents are correct and that the oscillator is functioning correctly connect the 100 mV output of the AK 1 to the audio input of the ST 6 Put the ST 6 AUTO STAND...

Page 19: ...t t 7 DIAGRAMS AND PHOTOGRAPHS The schematic diagrams parts layout and circuit board photographs are shown on the following pages 15 I J J...

Page 20: ...k Figure 1 AK 1 matic Diagram j _ _ Low poss Filter Notes R26 220 R27 22 k Amplifier R25 T R28 TR29 lk 5 6k 470 I 0 Cl0 0151 1 IRx 100 mV RMS Output Low zl 20 mV RMS Output High zl 1 All resistors l 4...

Page 21: ...cbiN414B R 3 _ ___2__ R23 Q6 D31N4738 10 o f 0 l IBK M 3394 o o c C5 JJ C3 500pf t Q2 R24 R O K cr R14 b MPS3703 2K 22 220 8 Cl RIB Rl7 IOJ f 33K 33K NOTES I REFER TO SCHEMATIC FOR EDGE CONNECTOR PIN...

Page 22: ...18...

Page 23: ...20 mV RMS OU SHIFT 850 170 I I 10 I HIGH z TPUT C SWITCH Sl I J2 1 I ll l J4 ti100 mV RMS 0 0 Y JL 1 INPUT nv I I 500 UTPUT I I ohms I I 5 I I J3 INC I n CW 10 KEY 12V D C 30ma loot NC I Jr 1 Figure...

Page 24: ...N SERIES KEVER TUBE BREAK THIS CONNECTION L ADD THESE PARTS 1 I I I 4 7 k 5 I I _ _ 6 J 3 9k I I 47 I 6 I 1 I _ ____ I 2 ________ TO AK 1 Figure 6 AK 1 Connection to Tube type Demodulator I HAL FLI 1...

Page 25: ...i2 Jl A II iO SHIFT SWITCH 850c IIO Sib 9 OF ST 5 8 I FSK 7 12V 6 OO _L I 001 I 5 I 0 NC TIP 4 001 0 NC RING J2 y 3 3 r GND 2 OO _L FSK KEY I I Figure 8 AK 1 Connections to ST 5 F 1 20 mV RMS OUTPUT H...

Page 26: ...t Board 5 r I _ A 6os w I C502 wo u 250 v R502 l5k 2W R503 8 2k 1W c Loop to Printer Jock J3l S78 AC Power J5 FSK Output B 1 l I I I I I I I I I I I I I Circuit Board 5 Power Supplies R504 l5k 2W C508...

Page 27: ...P nk notused Whole I Compments t 4 t 5 Terminal Sino A 4f 12 Conductor Coble to Rolls 12 Conductor Coble from Rear Panel J g J ij Po ver Cord from Rear Panel I 4 P nB lj Lilli II Ill II I II 4 7 3 St...

Page 28: ...VOICE SIGNAL AFSK RTTY ___ TONES VOICE MIC _ l JI r _ M S 0 AUDIO AMPLIFIER BFO OSCILLATOR f f S M M S fc BALANCED MODULATOR r l I fc y FILTER Figure II Use of AFSK with a Typical SSB Transmitter S M...

Page 29: ...0 I LSB BFO I FREQUENCY I I I r _ _____ 2550Hz 2295Hz 2975Hz I 2125 Hz ORIGINAL I LSB BFO I FREQUENCY I 1 MODIFIED LSB BFO FREQUENCY U CARRIER REJECTION DUE TO FILTER 60dB I 0 2kHz a LSB Voice Generat...

Page 30: ...c Semiconductors silicon signal diodes 1N4148 1 1N4738 Zener diode 4 MPS3394 NPN transistor Ql Q5 Q6 Q7 2 MPS3703 PNP transistor Q2 Q3 1 2N4871 unijunction transistor Q4 Trim pots 1 1 K 2125Hz fine ad...

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