Re: Would This Work?

[nobody@xxxxxxxxxxxx (Dave Houston)]

Whether intentional or not, once the transceiver receives/decodes the RF, it
sends it to the powerline (after waiting for a positive ZC if unit 1 or 9).

If on opposite phases, for units 1 & 9, one will lag the other by 1/2 cycle
(1/120s or 8-1/3ms) which guarantees a powerline collision.

I doubt you are able to discern an 8ms difference in the relays activations.
If you can detect a time gap, there are two possibilities. Either there is a
space/time loop (unidirectional, of course) between the transmitter and one
transceiver or one of them is receiving a weaker RF signal (or has a weaker
receiver) and cannot decode the first copy. The first copy (or copies) will
still affect the gain and threshold so that it might be able to decode a
subsequent copy. Copies are sent at ~108ms intervals. As much as I like the
first scenario, I suspect the second scenario is more likely in that the
second scenario doesn't require opposite phases.

"Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote:

>I've always learned to ask to make sure I'm reading right.  (-:
>
>Does this mean you get collisions just for sending the unit 1 or 9 codes,
>even by accident?  This might explain some weird behavior I am seeing in
>that twin TM751's set to the same housecode activate in sequence - I can
>hear the living room one click first and then the bedroom one if I press B1
>"ON" on an RF remote.  It's always a definite, same delay between the
>activations and I have to mash down on the button to get the second one to
>click.  Not sure I can tell what phase they are on, though without flipping
>breakers and that's a sore subject still around my house!