Re: XTB-II 2-Phase Version

Hello Jeff,


you suggest worked fine for one of the beta testers. The number of
transmitters that can be shared will be a function how much load is
contributed by each one.

They wouldn't have to be. If you used a series resonant circuit and a
FET as the switch this should not present a serious load while the FET
is gated off.

The XTB has an output circuit similar to what you describe. But that
doesn't help the problem caused by multiple X10 transmitters loading one
another on a powerstrip plugged into the XTB X10 input receptacle. The XTB
output driver is isolated from its input receptacle at 120KHz.


Possibly because the design of the other transmitters is, ahem, sub-optimal? If they'd all tri-state their output stages when not transmitting they should not load down the line. Provided that any output filtering to comply with agency regs is done correctly. A diode T/R switch would be another option but isn't really needed for X10.

My area of work is medical and there we often have a similar task, running pulsers onto an analog bus that is also used for receiving. Microseconds after the pulsers let go they can't even present an ever so slight load because we have to be able to listen all the way down to the noise floor. Else my client's competitors would have them for lunch.

--
Regards, Joerg

http://www.analogconsultants.com
.

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