Re: I2C board placement
- Tnx Tony
I may mount the I2C in a small enclosure with key jack for key.
I noticed insulating washers for mounting main PCB were included in
kit. I am trying to work out grounds to minimize interference from
ground loops. It looks like keeping grounds between I2C and main PCB
limited to the ground connection on pic socket may be best soultion.
I have isolated the I/Q ins and outs from chassis with ground
isolation switches to minimize loops in those lines.
Should I also isolate the power return from chassis that way
completely isolating PCB from chassis?
Working on an aluminum enclosure now. On the bench I have a very quiet
system using either an SB24 or E-MU 0202 for I/O along with a PCI
sound card for audio and do not want to start chasing ground loops
when I mount everything in enclosure.
All help very much appreciated!
BTW for those chasing PTT problems if you are using a serial
connection and an external sound card you may need to connect ground
on pin 5 of serial connector to get all to work correctly. The
external card may have it's grounds isolated from PC.
--- In email@example.com, "Tony Parks" <kb9yig@...> wrote:
> Hi Tim,
> It probably would be best to have several inches separation between
the USB I2C interface circuit and the PIC socket. The v8.4 Lite+USB
Xtall had the USB interface close to the RX circuits and this resulted
in some RX noise problems.
> Tony KB9YIG
> ----- Original Message -----
> From: Tim O'Rourke
> To: firstname.lastname@example.org
> Sent: Saturday, September 27, 2008 6:38 PM
> Subject: [softrock40] I2C board placement
> Would it be possible to place the board directly over the pic socket
> or would that generate some noise by being too close to RX band pass
> Thanks in advance Tim W4YN