After looking into this more I see the MAX1556A was specified in the schematic and BOM. The MAX1556 was placed on the board. These two parts work differently WRT to the programming pins D1, D2. If the MAX1556A had been used we would have been fine.

I see no stock not his part at Mouser or Digikey or Newark, or anyone in the US so far. I do see inventory in ASIA. If they will sell a small quantity of say 16 we should be able to swap out the parts. Shipping cost will be $40 to $60.

This part is now Obsolete at Analog Devices.

I think these part was used on earlier AMSAT boards. I would like to know if there is any inventory available before ordering the parts from Asia? We need a minimum of 8 but I would like to have 16 to be sure we get them soldered on the boards.

Bob