[hpsdr] [Q] anyone using HFPacker Low Pass Filter with Penelope?

[Chris Gomoiu]

Hello Ken,

>From what I've seen on a spectrum analyzer Penelope output is very clean,
well below -40db FCC requires. Measured around -50db or better here, see
also http://openhpsdr.org/wiki/images/0/07/Penny-5.png for a 20m output
spectrum plot.

Insertion loss of a well designed LP filter should be below 1db, more like
max 0.1db otherwise using it @ the output of an amp will destroy it.

I've been using Penelope directly connected to the antenna here without
spectrum cleanliness worries since my board arrived doing WSPR 24/24.


73's
Chris 4X1RF




On Sat, Jul 31, 2010 at 2:57 PM, Ken N9VV <n9vv at wowway.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi, is anyone using the HFPacker AMP Low Pass Filter
> with the output of the Penelope?
>
> http://www.hfprojectsyahoo.com/kitlowpafimo.html
>
> I am trying to decide if I need it in addition to
> the filtering in my external amplifier?
>
> Would you expect significant loss from the Penelope
> when driving the LPF?
>
> thanks,
> Ken N9VV
> --
>
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