Richard you deleted my image in the reference so others might wonder about some stuff missing, but no real matter there.
My thought to verify the bandspread is simply to turn the BS dial CW ? and knob? ?CW and look at the BS capacitor meshing. It should be open! ??right? ?If somehow it is not it needs fixing first.
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If it is ok, it’s back to square one. We will have to recruit a real expert.
From:[email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io Sent: Thursday, February 6, 2025 4:33 PM To:[email protected] Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!
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Which way is the band spread capacitor facing? Capacitance should be minimum with dial at zero. This is Halicrafters design, on non-calibrated band spreads the dial indicates the amount of capitance. I think calibrated dials are set for the logging scale to be the same but in any case the band set is generally at the high end of the band. The dial cord is backwards of its orientation on later receivers like the S-40. The string crosses over. BTW, I wondered about this. My S-40A came with the band spread string reversed and stop peg facing the opposite way to that shown in the handbooks. I reversed it. In its original position the band spread went from zero to 100 but in what I thought was the correct position it stops at about 95. Same for the S-20R. It made me wonder if the original position was correct and there is a global error in the handbooks for all this series of receivers. The position as shown in the S-85 handbook seems to confirm this. A puzzle. At some point I will try reversing the cable in both receivers. In any case, at ZERO the band spread is at minimum band spread capacitance, plates turned out from stator, this is as it should be regardless of the cord.