SB644 Ext VFO & SB644A Ext VFO

[Gene Holcombe]

Having made the plunge into obtaining a SB104A, I have to make a decision for an ext VFO, one is a SB644 and the other is a SB644A.  Question..What is the difference in the units and will either work on the SB104A.  Anyone have one available at a reasonable price?

Gene  N5ZDF
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