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| Subject: | Re: LF: Noise R75 - rs232 from smpsu - |
| From: | Dave Pick <[email protected]> |
| Date: | Fri, 23 Jul 2010 22:26:06 +0000 (GMT) |
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Laurence In my remote station I put the Dell brick in an Eddy box (die-cast box) with a proper mains filter on the input and chokes and feed-through capacitors in the DC output lead. Drilled some holes for ventilation. Quiet as a mouse. A linear PSU should also be fine but quite large. The RS232 is unbalanced of course, but if you run it in screened cable and use a ferrite common-mode choke dies it not help? Dave G3YXM From: Laurence KL7UK <[email protected]> To: [email protected]; [email protected] Sent: Friday, 23 July, 2010 21:47:56 Subject: LF: Noise R75 - rs232 from smpsu - 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 The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. Get busy. |
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