Re: XTB-II 2-Phase Version

["Jeff Volp" <JeffVolp@xxxxxxx>]

"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:fmMDg.600$q63.422@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello Jeff,
>
> >>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.

Ah!  So you probably don't have to design devices that can be built for a
couple of bucks.  I have done designs for both military and commercial
applications.  They are vastly different worlds.  In one case we strive for
performance.  In the other case we wonder how cheap can we make it and still
have it work.  In this day and age, volume sales usually go to the cheapest
products.

Jeff