[Hallicrafters] HT-37 Sideband Supression

[Joe and Ann Vlk]

I am still having trouble getting the unwanted sideband on my HT-37 properly supressed.  I inject an audio signal at the mic input and watch the display on my Icom 756 pro.  I see the unwanted sideband amplitude go down about 25-30 db on the display as I adjust the HT-37 (HT-37 spec is minus 40db @ 1 kc).  Yet, when I modulate the rig in regular conversation on the air, the receiving station says my unwanted sideband is only about 2 S units (12 db ?) lower than my desired sideband.  Any words of advice?  Joe  W8DCQ