[RFI] DSL Filter

[rick darwicki]

I missed it, what filter? link?

Rick, N6PE
===============================================================
Remember, E = M * C^2 was not the entire equation.


--- On Sat, 3/7/09, rfi-request at contesting.com <rfi-request at contesting.com> wrote:

> From: rfi-request at contesting.com <rfi-request at contesting.com>
> Subject: RFI Digest, Vol 75, Issue 3
> To: rfi at contesting.com
> Date: Saturday, March 7, 2009, 12:00 PM
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> Today's Topics:
> 
>    1. DSL Filter Update (Roger Parsons)
>    2. Re: DSL Filter Update (Jim Brown)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 7 Mar 2009 11:29:05 -0800 (PST)
> From: Roger Parsons <ve3zi at yahoo.com>
> Subject: [RFI] DSL Filter Update
> To: rfi at contesting.com
> Message-ID:
> <930400.19730.qm at web110510.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset=utf-8
> 
> 
> Just to advise the group that a couple of other stations
> have had success with this filter. Nick, VE3FJ, also checked
> out its frequency response with the following results:
> 
> 1.85MHz   -26dB
> 3.65MHz   -46dB
> 7.24MHz   -68dB
> 14.13MHz  -60dB
> 21.0MHz   -56dB
> 28.5MHz   -54dB
> 
> Of course in theory the stop band attenuation should
> continue to increase with frequency, but in practice there
> will be strays across the filter that will cause a
> performance drop at higher frequencies.
> 
> 73 Roger
> VE3ZI
> 
> 
> 
>       
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Sat, 07 Mar 2009 11:42:04 -0800
> From: "Jim Brown"
> <jim at audiosystemsgroup.com>
> Subject: Re: [RFI] DSL Filter Update
> To: "rfi at contesting.com"
> <rfi at contesting.com>,	"Roger Parsons"
> 	<ve3zi at yahoo.com>, "ve3zi at rac.ca"
> <ve3zi at rac.ca>
> Message-ID:
> <20090307194159.6804357D0A at gw1.nlenet.net>
> Content-Type: text/plain; charset="us-ascii"
> 
> On Sat, 7 Mar 2009 11:29:05 -0800 (PST), Roger Parsons
> wrote:
> 
> 
> >Just to advise the group that a couple of other
> stations have had 
> >success with this filter. Nick, VE3FJ, also checked out
> its 
> >frequency response with the following results:
> 
> >1.85MHz   -26dB
> >3.65MHz   -46dB
> >7.24MHz   -68dB
> >14.13MHz  -60dB
> >21.0MHz   -56dB
> >28.5MHz   -54dB
> 
> >Of course in theory the stop band attenuation should
> continue to 
> >increase with frequency, but in practice there will be
> strays 
> >across the filter that will cause a performance drop at
> higher 
> >frequencies.
> 
> Roger,
> 
> Exactly how was the response measured?  What source and
> load 
> impedances?
> 
> 73,
> 
> Jim K9YC
> 
> 
> 
> 
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> End of RFI Digest, Vol 75, Issue 3
> **********************************