[ARC5] MF and the ARC-8 system

[DSP3]

If I might add something to the discussion.. If one can find the vernier 
disk that goes with later ART-13A, it can easily replace the disk on 
earlier models, thus allowing finer calibrations.  You'd need the later 
calibration book, but that's no real issue.  Confirmation can be had by 
noticing that certain calibration points coincide, comparing the old to 
new book.  I did this with two units, here, and it works just fine.  I 
was fortunate to locate two VFO autotune assemblies with these disks.

Jeep - K3HVG