RE: success

["Keith Doxey" <keith.doxey@xxxxxxx>]

Sounds like the HK is operating at something other than 38kHz.

The sensitivity of the receiver drops off severely as you get outside its
band. There are other receivers in the range TSOP1836, TSOP1840, TSOP1856
for 36,40,56 kHz respecively. You state that the visible LED is hardly
working which suggests that it is hardly detecting the signal thereby
indicating it is out of band. A different receiver would probably pick it
up
OK but you you would then possibly loose all the other stuff that operates
on 38kHz.

You could possibly overcome that by having 2 receivers in parallel, one
would detect 38k and the other <whatever k> the HK operates on. The
visible
LED would then appear to work properly but you still wouldnt control your
gear as the transmitter circuit outputs 38kHz. You would need to either
change resistor values to get the required frequency (again killing the 38k
stuff) or add a second transmitter with a stick on mini-emitter tuned to
the
frequency of the HK kit.

Fun isnt it :-))

Keith

> -----Original Message-----
> From: rj@xxxxxxx [mailto:rj@xxxxxxx]
> Sent: 10 December 2000 20:50
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] success
>
>
> I had some good luck with the IR transmitter in the weekend,. all up
and
> working fine. I get excellent coverage from the receiver, over 10
> meters in
> the theatre. small problem is that the unit works fine for all my
gear...
> except my Harman Kardon AVR amp.. which is the main thing I want
> to control,
> the remote control that came with the harman is programmable and
controls
> the rest of my gear perfectly through the receiver / transmitter
> except when
> you switch to the HK amp and try.  the visible LED does pulse but only
> faintly when trying to send to the HK amp.
>
> any ideas please......
>
>
>
>
>


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