How to hack a Roberts R9921 as a Spirit box

I will talk you through and show you how to hack the legendary Roberts R9921 radio. The Roberts R9921 is a popular radio to hack as a spirit box. It is easy to do and more importantly, gets great results. Do it yourself and save money instead of getting an inferior SB7 or SB11. These quality radios get much better ITC results and can still be picked up for less than £30 unmodified, but do get snapped up quickly as word is out on these long discontinued radios.