11-14-2020, 12:34 PM
Hi Daniel and welcome,
Yes you are looking for a specific inductance which the resistance won't tell you. I think it's roughly 225 uh but sometime I get lost in the zeros. Won't hurt any thing if it's not right just won't peak any where. If it's more sensitive @ the low end There's too much L so need to remove some turns. Same goes for the high end poor sensitivity @ the low end it needs more L. You maybe able to get a rough idea from pics in the Sam's or on line as to the dimensions & # of turns.
To adjust the IF I would use a rf choke in place of the loop (value isn't all that critical) and feed the 455kc signal at the ant connection. Set the generator for 455kc and use some sort of method to check that the generator is spot on. Turn the volume up and generator output down so you can just hear it. Peak and repeak the IF adjustment for max speaker output. Most of the time it's no more than a turn or so on any one of the adjustments.
> Jackson Electric Frequency Generator
Hmm could have voted for FDR in his 1st go around...
GL
Yes you are looking for a specific inductance which the resistance won't tell you. I think it's roughly 225 uh but sometime I get lost in the zeros. Won't hurt any thing if it's not right just won't peak any where. If it's more sensitive @ the low end There's too much L so need to remove some turns. Same goes for the high end poor sensitivity @ the low end it needs more L. You maybe able to get a rough idea from pics in the Sam's or on line as to the dimensions & # of turns.
To adjust the IF I would use a rf choke in place of the loop (value isn't all that critical) and feed the 455kc signal at the ant connection. Set the generator for 455kc and use some sort of method to check that the generator is spot on. Turn the volume up and generator output down so you can just hear it. Peak and repeak the IF adjustment for max speaker output. Most of the time it's no more than a turn or so on any one of the adjustments.
> Jackson Electric Frequency Generator
Hmm could have voted for FDR in his 1st go around...
GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
