[Dxbase] Prefix mappings

Tue Nov 29 18:09:48 EST 2005

Last weekend I did the ARRL SS Phone Contest and the CQ WW CW Contest this weekend. I imported my log into DxBase2006 and after initializing tables, it told me that I had a new country on 20M SSB. Since the WW contest was CW and the SS contest was SSB, I was confused. Certainly I had KL7, KH6, KP2, KP3, etc. already, after having several years of sweeps. I ran Joe's report that told me new band-mode countries worked in a contest. It told me that on 20M SSB, I had worked a new country A5, from a QSO with AC0H. Huh? Checking the prefix mapping, I saw the following entry:
MAP PFX: AC Pri PFX: K OLD1 PFX: A5 Old1 Date: 31-12-1971
MAP PFX: AC0 Pri PFX: K 
Why did it map this AC0 call worked in 2005 to an A5 prefix? Was the alias list busted? No, so I checked the call map. There it was. AC0H mapped to A5. So was AC1H, AC5H, AC6H, AC7A, AC7H, and AC8H. I checked these calls in QRZ and they are valid US calls. 
Why the mapping?