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LF: Noise R75 - rs232 from smpsu -

from [Laurence KL7UK] [Permanent Link][Original]
To: <[email protected]>, <[email protected]>
Subject: LF: Noise R75 - rs232 from smpsu -
From: Laurence KL7UK <[email protected]>
Date: Fri, 23 Jul 2010 12:47:56 -0800
Importance: Normal
Reply-to: [email protected]
Sender: [email protected]
 
Anyone done any common mode noise mitigation from the RS232 port of the R75 Rx> - the noise coming up from the SMPSU/processor from the old Dell puter - cable is double screened - choking off using J (75) type has seen little improvement - this is my last hurdle to unimpeded remote rx on 137 - any pointers appreciated - everythings bonded and Ive tried the on/off earth tricks at various locations -
 
Anyone had any success of powering a Dell D series from a non standard non switched PSU? (the noise goes away when the DC from the Black Dell brick is removed but it may also be partially screen/processor noise...)
 
with thanks
 
Laurence Kl7UK

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