[Hallicrafters] HT-37 Sideband Supression

[Mark Shaum]

Joe,

I don't have my original notes handy from when I swept an audio generator 
through my HT-37, but I do recall that 20-25 db of unwanted sideband 
suppression was the best I could manage across the entire audio range.  I 
could easily get 40+ db at any single frequency via adjustments, but a sweep 
generator more closely will show what the exciter will do when voice 
modulated.

And with S meters being they way they are nowadays, 2 S units could mean 
anything from 8 to 20 db depending on the receiver and received strength.

73! - Mark K9TR

----- Original Message ----- 
From: "Joe and Ann Vlk" <jvlk at charter.net>
Subject: [Hallicrafters] HT-37 Sideband Supression


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
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