You have ONE LNB which uses Vert/Horiz. If you have 55 decoders hooked up to it and 54 are on the Vert channels and the Lonely 'one' is watching a Horiz channel, Then the Lonely wins cause 18v is higher than 13volts.
Look, just use one decoder (DM7020) first. Get it working right before ya start hooking (Looping) other equip when your not real sure on what your doing.
Your other decoder (in my opinion) is overriding your DM7020
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