The proposal from the Technical Sub-Committee to change the rule about the number of receivers, as above, may not quite do the complete job required.D.2.4(a)(1)
One or more receivers
Many owners (and those technically knowledgeable) think that the Spektrum AR7000 system and similar others comprises just one receiver. Other owners (and others equally technically knowledgeable) think that the AR7000 comprises two receivers. Both sides to the discussion are in complete agreement, I think, that whether there are one or two receivers, the system is designed to work as an integrated whole, and to offer the functions and functionality of a single receiving system.
An interesting experiment which may help to decide the question of the number of receivers in this system is to try to control a yacht when one or other of the receivers is removed or disabled. While we have not yet been able to disable the 'primary receiver' in a way which still allows the 'secondary' to pass its signal through for processing, we have been able to disconnect the secondary receiver and see that the system functions fine (under 'laboratory' conditions, anyway).
This makes it clear that the system comprises more than just 'one receiver'. But it may also make it clear that if the 'secondary' receiver cannot be used or cannot function as a stand-alone receiver, the system does not comprise two receivers either.
This observation gives a technical difficulty to the proposal to change the rules, because the change still does not, by itself, permit the Spektrum system (which, I believe, both sides to the discussion think is an excellent system and should be permitted in the class). The reason is the other concept of the class rules, that something not explicitly permitted is prohibited.
This is how the difficulty might unfold if the rule change was in place:
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Fred: Hi Lester, I see I am measuring your new IOM today. Me: Yup, and it sports the fancy Spektrum AR9000 receiver system. Fred: So, Lester, how many receivers do you have there? Me: Well, I am told by some that there is but one receiver there. Fred: OK. Let me remove this little black box with some sticky-out wires -- now, does your RC work? Me: Er, yes it does, but... Fred: Well, I can only certify your boat with this little box removed, since there is no explicit permission for it. Me: But the new rule says one or more receivers are permitted! Fred: Sure, but this is not a receiver, is it? The RC functions fine without it, you told me there was just one receiver, and I can't see how this extra little box could work as the second receiver which is permitted by the rules...
Technical developments being what they are, it is interesting to read that the Spektrum DSM2 system actually broadcasts and receives (the same command sequence) on two separate frequencies, and the AR9000 really does have two receivers. What is important for the IOM, I believe, is that none of this matters while the 'intention' of the rule is respected -- the control of only two channels. Perhaps the entire rule about receivers can be removed...D.2.4(a)(1)
One receiving system