Not quite true.
ANY receiver without a DECA and on the same SWiM [think SD] needs to have the filter.
Yup, the HR20-100 needs a BSF with a DECA, all other non-24 receivers need a DECA or BSF on a SWM with DECA anywhere. Once you think about it, it makes perfect sense.
p.s. This includes a SWM with an Hx24 attached that doesn't have an Ethernet attached... its onboard DECA is perfectly capable of disrupting another receiver on the SWM, even if it's just 'polling' for another DECA. Perhaps a reason D* only wants to give 24's to DECA customers.
Edited by dwcolvin, 15 May 2010 - 12:29 PM.