RE: (was) IR mini emitters and Sky+ box (now) how i solved a similar problem

["Paul Gale" <p-gale@xxxxxxx>]

Thanks David. I'm not using Xantech dist blocks (IR is distributed via a
multi zone music amplifier system). I think I did before but I'll stick
my scope on the output and see what I'm getting. I guess it's possible
that the amp is 'over amplifying' the signals?



Paul.



-----Original Message-----
From: David Anumudu [mailto:david.anumudu@xxxxxxx]
Sent: 02 March 2003 09:35
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] (was) IR mini emitters and Sky+ box (now) how i
solved a similar problem



I went through all of this with sky+, and some other equipment using the
xantech gear. I did have a symptom though that all was not well, the
activity led on the microlink (and hence all the emitters) were
continually
flashing slightly, like they were picking up background noise. I tried a
few
things, and emailed xantech support. one of the things that they
suggested
checking was the voltage to the xantech distribution block. I have
bought
the xantech in the uk from a well known HA supplier, so didn't think
this
would be a problem. however when I looked at the psu closely it didn't
say
regulated on it, so I measured it and it was  17V not 12V. So, I
replaced it
with a regulated supply (measured 11.98v) , and the noise disappeared.
Furthermore, I have been able to move the emitters on various bits of
kit
directly on to the IR receive windows, rather than suspending them on
bits
of CD cases to hang them the necessary 3 or 4 inches away as was
required
before.
hope this helps
David
----- Original Message -----
From: "Paul Gale" <p-gale@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, February 28, 2003 10:35 PM
Subject: RE: [ukha_d] IR mini emitters and Sky+ box


> It's a variable resistor I tried - continuously transmitting and
> adjusting from 20K all the way down to 0R. I think it worked best at
the
> lower 1K values but certainly didn't cure the problem.
>
> I'll try disabling the HV LED tomorrow (although I'm pretty sure it's
> not interfering). No other LED's in sight.
>
> Paul.
>
> -----Original Message-----
> From: Simon Coates [mailto:ecolume@xxxxxxx]
> Sent: 28 February 2003 21:48
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] IR mini emitters and Sky+ box
>
>
> ----- Original Message -----
> From: Paul Gale <p-gale@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: 28 February 2003 21:11
> Subject: RE: [ukha_d] IR mini emitters and Sky+ box
>
>
> > mmm..odd
>
> That is odd.
> With a 20K resistor in series then there'd be barely be enough current
> (less
> than a 1/4 mA) to get the LED to light even faintly.
> Is there a chance that there's another emitter (or an IR blaster) or
> maybe
> HV's front panel emitter nearby.  BTW HV's IR TX can be disabled if it
> turns
> out to be the problem.
>
> Other than that - I'm stumped!
>
> Regards
>
> Simon
>
> >
> > I tried a variable resistor from 20K all the way down to short
> circuit.
> > Helped a small amount but the biggest change was obtained by
pointing
> > the remote at the side wall in the AV room (and bouncing the
signal).
> > I'm using the IR distribution of my multi zone amp.
> >
> > Why would bouncing the IR signal make such a big difference but
> putting
> > a resistor in series with the emitter make little difference?
Could
> the
> > amp IR distribution system be over-amplifying maybe? I did look
at
the
> > transmitted vs distributed signals on my scope and they looked
pretty
> > similar (apart from the voltage of the IR remote across the IR
LED
is
> > about 1.5V and the distribution system is 5V).
> >
> > Paul.
> >
> > -----Original Message-----
> > From: Simon Coates [mailto:ecolume@xxxxxxx]
> > Sent: 28 February 2003 20:16
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] IR mini emitters and Sky+ box
> >
> > Paul,
> >
> > If the emitter is small enough (I've got some with feedback LED
that
> are
> > tiny) you could try and stick it just above viewing card.  The
front
> > flap is
> > easy to remove.  You could run the wire out under the box and
clip
the
> > door
> > back on.
> >
> > Might work.
> >
> > Regards
> >
> > Simon
> >
> > PS I'm trying to figure out how to control 2 Sky+ boxes at Node 0
-
> > since
> > Sky/Pace have made a stupid decision regarding IR control.
> >
> >
> > ----- Original Message -----
> > From: Paul Gale <p-gale@xxxxxxx>
> > To: <ukha_d@xxxxxxx>
> > Sent: 28 February 2003 20:02
> > Subject: [ukha_d] IR mini emitters and Sky+ box
> >
> >
> > > I'm having a few troubles with controlling my Sky+ box
(located in
> > > Node0). I've got a couple of different makes of mini
emitters
> > including
> > > some Xantech 283M mouse emitters. It seems that the
transmitted IR
> > > signal is too strong for the Sky+ box as it sometimes only
> recognises
> > 1
> > > out of 10 or so button presses when the emitter is directly
over
the
> > IR
> > > receive window. Moving the emitter about 15cm away improves
the
> > > recognition a lot.
> > >
> > > I can't permanently position the emitter at this distance as
the
box
> > is
> > > mounted in a 19" rack.
> > >
> > > Any thoughts on cutting the strength of the signal (using a
> resistor,
> > > coloured film, different emitter etc)?
> > >
> > > Thanks,
> > >
> > > Paul.
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
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