[ARC5] Smart People: IF Curve- What Am I Doing Wrong?

[David Stinson]

Thanks for writing, Bill and Neil.

There are no fixed-tuned local oscillators on any band.
The IF tuning is mechanically ganged with the 
PTO and RF AMP tuning- all together.
The IF tracks the PTO tuning 1.0-1.5 MC.

The PTO is multiplied 3 times on bands A and C,
four times on band B and 5 times on band C.

Examples:  
Fo = 3 MC
PTO = 1.5 MC x 3 = 4.5 MC.  
Fo 3 MC mixed with 4.5 MC = 1.5 MC IF Freq.

Fo = 6 MC
PTO = 1 MC x 5 = 5MC
Fo 6 MC mixed with 5 MC = 1 MC IF Freq.

I think the disruption of linearity is the likely answer.

Thanks again,
Dave AB5S