Thanks for that

I have the option to use another board under the main one as the case has
the mountings for it in fact it would make good since to move the whole RF
side to it's own board but a problem arises if I do that, in that the GLCD
hole pitch is 2mm and I cannot find any interconnect cable at 2mm pitch

So next question where can I get PCB interconnect cable that is 2mm pitch
preferably the stuff that is pre stripped tinned etc.

Thanks again Tim

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Matt Pobursky
Sent: 13 June 2003 00:36
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: PCB lay out question


On Thu, 12 Jun 2003 22:46:19 +0100, Timothy Box wrote:
> On a board I am doing I am restricted to where I can place the LCD
> connector and a PCB mounted BNC aerial connector.
>
> The BNC has to over lay the lcd pin sockets. While it is not a
> problem as the LCD is on 1 side and the BNC there might be a noise
> issue.
>
> The obvious thing is grounding of the pins on the case of the BNC
> which I know I have to resolve but the my main worry is noise getting
> in on the RF signal. The two pins under the BNC are the backlight
> which might be PWMed through a mosffet to control brightness.
>
> Any thoughts?

If you are really stuck with the mechanical constraints you've shown,
I'd consider a cable assembly between LCD module and PCB. You could
either use a flat flex cable to relocate the PCB connection in the
negative Y direction or use a discrete wire cable and locate the
connector almost anywhere on your PCB you'd like.

I normally don't like to do this (I'd rather use a solid mechanical
connector system), but I have occasionally used a cable is situations
like yours.

I agree with the potential noise problems too. Unless you have the time
and money to risk a second spin on the PCB, I think I'd relocate the
LCD connection on the PCB.

Matt Pobursky
Maximum Performance Systems

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