02-15-2021, 11:35 PM
Dick
It's just a pickup loop (coil of wire) place around the mixer tube to sample the osc signal. If you subtract the IF frequency from the osc reading that will give you the receiver dial reading.
Maybe a little low grade loc-tite might stiffen the screws up a little or some non hardening gasket glue.
Mike
I think the reason for using harmonics was in the 30's generators were not all that accurate so by using a crystal osc and harmonic a more accurate adjustment could be made. Not sure why it would be done on the bc band but on the sw bands it makes good sense. THe 16B uses something like a 3.7mc xtal to adj all of the sw bands.
It's just a pickup loop (coil of wire) place around the mixer tube to sample the osc signal. If you subtract the IF frequency from the osc reading that will give you the receiver dial reading.
Maybe a little low grade loc-tite might stiffen the screws up a little or some non hardening gasket glue.
Mike
I think the reason for using harmonics was in the 30's generators were not all that accurate so by using a crystal osc and harmonic a more accurate adjustment could be made. Not sure why it would be done on the bc band but on the sw bands it makes good sense. THe 16B uses something like a 3.7mc xtal to adj all of the sw bands.
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 it!
Terry
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