You might consider ordering the service record files for these two names, perhaps something might turn up to offer you a clue. They are too faint to read
online. You may procure these service records files at: http://history-sites.com/research/index.htm
I tried a Goggle search Confederate Signal Corps hoping to find some reference book on the Corps. No joy, but I found this interesting tidbit "The Confederate Signal Corps was established in 1862. Nearly 1,200 men were in the secret service, most of whom were well-to-do and knew more than one language."
If he or his widow later filed for a pension, ca 1890+, you would need to know in which state he resided at the time as there
is where pensions were issued.
Good hunting,
George Martin