[hpsdr] [Q] no RFI power supply for HPSDR?

[Ronald Cox]

Ken,
It is common practice now on embedded systems to use RF filters on every I/O pin of a controller such as an engine controller. With over 30 years of experience as a system engineer on GM powertrain controllers, other on-board computers, and race car controllers for CART and Indy cars, the only way to win the RFI (both radiated out and incoming) battle is to be 100% thorough in the application of RFI suppression.

Ron W9KFB
Indianapolis


On Apr 19, 2010, at 11:07 AM, Ken N9VV wrote:

> ah ha! thanks Ron. O.K. I put a single big choke on the output of my Astron last night and it lowered the RFI to -110db. But there
> is something wrong with the Astron and I want to replace it. I
> wonder about the TAPR power supply for the HPSDR?
> 
> many thanks for your good advice,
> Ken
> 
> 
> On 4/19/2010 9:58 AM, Ronald Cox wrote:
>> Ken,
>> I have found that you can use most computer power supplies (my experience is mostly with Antec supplies) if you are methodical in the application of clamp on RFI suppression on every wire bundle leaving the power supply. You can't just put a couple on the harness and check to see if the RFI is effected. It is all or nothing! I typically test a rig after I assemble it and see what the spikes look like before the treatment, then I put in 10 to 15 of the clamp on TDK chokes that I buy on eBay from Hong Kong for 88 cents each. Then I check out the completed unit and it is like magic, all the unwanted signals are gone...
>> 
>> Ron W9KFB
>> Indianapolis
>> On Apr 19, 2010, at 10:42 AM, Ken N9VV wrote:
>> 
>>> ***** High Performance Software Defined Radio Discussion List *****
>>> 
>>> Hi, has anyone seen a review of computer style
>>> power supplies that have NO RFI generated from
>>> them? I am looking for a small power supply for
>>> my 3 board (Mercury + Ozy + Penelope) HPSDR gear.
>>> 
>>> thank you for reading my email,
>>> 73 Ken N9VV
>>> _______________________________________________
>>> HPSDR Discussion List
>>> To post msg: hpsdr at openhpsdr.org
>>> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>> HPSDR web page: http://openhpsdr.org
>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>> 
>> 
> 
> -- 
> if it's not CW it's CB


 1271690830.0