Hallicrafters HA-1 Operating And Service Instructions Download | Manualshive

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Summary of Contents for HA-1

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Page 2: ...relay of virtually unlimited life complete immunity to line voltage fluctuations and RF pickup rear connections for break in operation and auxiliary control and for external sidetone and key lever con...

Page 3: ...ING Mercury wetted contact relay switching nor mally open or normally closed to ground See paragraph 3 4 1 2 KEY LEVER INPUT Three circuit jack mounted on front panel accepts 1 4 inch diameter plug Sw...

Page 4: ...s those near radiators and heating vents The mercury wetted relay employed requires that the keyer be operated in a position no greater than 30 from a horizontal plane 3 3 KEY LEVER Various styles of...

Page 5: ...into the station control system The mating connector for this socket is an Amphenol type CP 8 one is supplied 3 4 1 1 AUXILIARY KEY LEVER CONNECTIONS Pin 1 5 and 8 At the user s option the key lever m...

Page 6: ...xample the maximum allowable voltage with a 5 ampere load is 50 volts 5 A 50 V 250 VA the maximum allowable current with a 500 volt supply is 0 5 ampere 500 V 0 5 A 250 VA Refer to paragraph 3 5 for m...

Page 7: ...ans of determining the necessary contact protection Hallicrafters Model HT 30 HT 32 HT 32A HT 32B HT 37 HT 44 SR 150 and SR 160 Transmitters require no protection network when used with this keyer For...

Page 8: ...chart Example II Measured current and voltage is 50 mA and 150 V respectively Solution The proper protecting network would be a 0 001 F capacitor Limiting capacity in series with a 750 ohm resistor I...

Page 9: ...Figure 5 Relay Contact Protection Chart...

Page 10: ...tially adjusts the gain of tube V3 to compensate for tube section differences and aging The adjustment should remain fixed for long periods of time and need only be readjusted when V3 is replaced or w...

Page 11: ...er ratios can be obtained to accommodate various transmitter keying characteristics or to suit personal preference see figure 6 To adjust the WEIGHT control proceed as follows 1 Turn the control to it...

Page 12: ...ation of the keyer requires a certain knack that comes only with practice Habits acquired by the use of conventional keys will have to be overcome before the full capabilities of the keyer can be real...

Page 13: ...feedback from V1A plate through resistor R16 holds V2A conducting after a momentary contact of the key lever to produce self completing dots The dots are uniform whether momentarily initiated or full...

Page 14: ...Figure 7 Model HA 1 Rear Oblique View Figure 8 Model HA 1 Bottom Chassis View...

Page 15: ...form a self completing dot 4 The output from the plate of V1A is applied through R15 to the grid of triode V4A which conducts and energizes relay K1 The self completing dash is formed as follows 5 The...

Page 16: ...on does occur the voltage chart and schematic diagram will aid in isolating and correcting the malfunction For the physical location of component parts refer to figures 7 and 8 NOTE The mercury wetted...

Page 17: ...e original buyer and the defect falls within the terms of the warranty It is necessary to present the Bill of Sale in order to establish warranty status After expiration of the warranty repairs will b...

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