[Milsurplus] RDO countermeasures receiver.

[Kenneth G. Gordon]

I recently brought two RDOs home. There were also a considerable 
number of plug-ins for these receivers, some still in the original packing 
boxes.

Does anyone here know exactly how many plugins and what 
frequencies there were originally available for those?

I also ended up with a smaller, aircraft version, of the RDO. It uses the 
same plug-ins.

Ken W7EKB