Re: Can someone shed some light

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#2173

From: Ken Taylor
Date: Wed, 14 Jan 2004 01:37

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"LBNote" <lbonnell@ozemail.com.ua> wrote in message
news:400499cd$0$893$61c65585@uq-127creek-reader-02.brisbane.pipenetworks.com.au...
> Hi,
>
> Here is a basic description of the circuit,
> PIC16F628
> UHF Receiver Module @ ~433Mhz
> http://www.computronics.com.au/module/txrxpair/txrx_data.pdf
> 1 LED
> 1k Resister
> 5 Volt regulator, plus 22mf and 100nf caps
>
> I have the PIC simply blinking the LED ~ every 200ms
> and the UHF module data output connected to my scope
>
> What I notice is that the UHF data output swings along with the LED, I
mean
> instead of just showing normal garbage as is the case when no data is
being
> transmitted.
>
> Problem is NOT present when the LED is removed from the circuit
>
> The module still seems to recover data though.
> Can someone give me there thoughts on what's happening, I understand that
> something is causing interference,
>
> How can I stop this ?
>
>
> Lorne...
>
Do you have good supply bypassing on the PIC? Nice and close to the device?
Also for the module.

Ken

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From: "Ken Taylor" <ken123@xtra.co.nz>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Can someone shed some light
Date: Wed, 14 Jan 2004 14:37:15 +1300
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