Glad to see you got it going, that was the hard part, congratulations!!
It would seem to me that what you are seeing on your screen is in fact what your RSP is receiving, surely it can be nothing else, it's nothing to do with configuration, IMHO it can only be RF, and unwanted RF by the look of it.
The fact that you see none of it when the RSP is connected to your PC means that when it's connected to your Pi, there is something different in the physical arrangement. Something in that arrangement is causing RF interference when your Pi is connected to the RSP, the obvious possibilities are
- the Pi itself, i.e all Pi's generate noise but somehow yours could be getting into your feed line or antenna in some way when in use with the RSP
- it's switch-mode power supply (the vertical green bands you see are typical of switch-mode noise)
- the Pi's ethernet connection, i.e. a CAT5 cable spreading noise from the Pi, or, bringing in RF noise from an ethernet switch
- perhaps some earthing complication
- a rearrangement of of your antenna leads or connectors
The first thing I'd do is run the Pi from a NON SWITCH-MODE power supply, i.e. a linear DC supply with an old fashioned transformer and linear regulator, even if you have to go out and buy a 5 V 3 pin regulator chip and build it yourself and connect it to a suitably old fashioned 13.8 volt linear supply. The "buck" power supplies that you see on eBay are switch mode, so don't think that's a way out, it needs to be a regulator like these
https://www.google.com.au/search?client ... 8we9ooOYAQ
Keep working at it, it's receiving!
BTW I can't easily put mine back on air or I would to show you it truly does work as expected and give you something to look forward to, my Pi is busy as part of a broadband hamnet mesh I'm playing with at the moment, but you can see from the thread that another user managed to work with mine remotely just fine.