Hallicrafters_SX-88_Owners_Manual操作说明书手册

Hallicrafters SX-88 Owners ManualHallicrafters SX-88 Owners ManualImages and text excerpted from original Hallicrafters literature.Section 1.General DescriptionThe Hallicrafters SX-88 represents the ultimate in precision communications equipment.This superb twenty tube communications receiver contains virtually every featureessential for top performance,operating ease,and dependability.It offers continuouscoverage from 535 kc to 33 mc and provides for the reception of AM phone,single-sideband phone,and CW signals over its entire tuning range.Electrical bandspread,calibrated for the 160,80,40,20,15,11,and 10 meter amateur bands,provides forfine tuning on bands 2 through 6.Band changing is accomplished from the front panel ofthe receiver,without the use of plug-in coils.The receiver employs dual conversion on all six bands.As a result,images are practicallynonexistent,rejection varying between 60 and 120 db depending on the band.Its 3stage 50 kc second IF with 8 tuned circuits provides "razor sharp"selectivity ..selectivity greater than most crystal circuits because of the extreme steepness of itsselectivity curve.Receiver selectivity is variable in six steps from 250 cycles to 10 kc atthe "nose"and 850 cycles to 24 kc at the "skirt".Two tuned r-f stages on all bands except the broadcast band where one stage isadequate,assures maximum sensitivity and a high signal-to-noise ratio for outstandingreception of weak signals.An antenna trimmer,adjustable from the front panel,permitspeaking of the 1st r-f stage to compensate for loading effects of various antennas.Receiver sensitivity for a 10 to 1 signal-to-noise ratio measures 1 microvolt on bands 2through 6 and 10 microvolts on band 1.A manual sensitivity control prevents