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Thanks for your clear correspondence, I have a 4U and a 3A. The 3A was just purchased to replace a non working 2A. The HB was over RF which does not exist on the 3A which is not a good change and has necessitated feeding the signal via an old VCR to get a RF signal to my bedroom. Anyway the question is how do I get the HB to the 4U if it cannot be via the SNLB as you state above as you did not explain that in the thread...Based on your diagram, The solution you propose will work IF the Explora you have is the original Explora or the 2A model. It will NOT work as indicated with the Explora 3A's because these do not have RF ports.
The better solution would be as already posted, to make use of a SLNB 500/501 because it eliminates the old 5-1 switch ( very dicey device even when it worked perfectly) and the Dual LNB ( because MC has moved quite a few channels over to hi band transponders
The 4U decoder is able to work when using a Unicable port as well.
There are some issues around how the HB is fed with a 4U decoder in the mix because it cannot receive HB via the SLNB.
We can deal with that after you have confirmed exactly which model Explora you have and what your intentions are re the use of HDMI instead of RF distribution.

No. The 3A does not have a demodulator anymore. All that is available is the HDMI output and the RCA outputs via the silly adaptor cable. The only way to get an RF feed is via recorder as you have done or via an external RF demodulator connected to the RCA output.Presume the red line is the input to the 4U RF in. Will the RF out which is currently connected to RF cabling to bedroom etc then pick up the signal from the 3A?
My question crossed your reply which answered my question, thanks. I use a remote blaster. The satellite settings for index and the other whatever it is are already as you noted in the diagram. Thanks again, will give it a go in the near future, will put the diplexer behind the 4U