[Milsurplus] 618S

[Mike Morrow]

Ray wrote:

>I did find a 618S1 in a different part of the backroom last year that 
>appeared complete but it had the "modified for SSB" statement across
>the front of the case so have no idea why it had a 618S tag and the 
>SSB statement.

It may have been a USAF 618S-1/MC, which apparently RCA made from
older Collins 618S-1 units.  It was USB-capable and *and* utilized
direct frequency input VFO tuning.

>You can pull the stick on label off the 38A head mode control ant it
>becomes a 38 head. think that may be the only difference.

You can pull off the label, but that won't turn it back into the
C-1398/ARC-38 original.  There were some electrical modifications
made to the unit, including mode switch wafer contact arrangement 
modifications.

The AN/ARC-38A does not give a schematic of the AN/ARC-38A control box,
only a schematic of the original C-1398 box and a description of the
electrical and mechanical mods that are needed to adapt it to the RT-594.

Jack has reported in the recent past on the quirks of using the ARC-38A
box in place of the proper ARC-38 box for controlling the original
RT-311/ARC-38. 

Mike / KK5F