[Amateur-repairs] Creating a LSB and USB Test Signal!!

I have been working on a receiver that has a USB and LSB problem. I am using my Icom IC-705 radio as a test source. I want to replace this with something that will generate a USB or LSB Test Signal continuously so I can inject it into the receiver and then check stages of the radio etc. etc.
I have most test equipment available but was wondering if anyone has done this and what type of test equipment setup they have used.. 
Thanks in advance for your help...
Robert WA6PHN

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