[amsat-bb] Filter out 3rd harmonic of 145MHz

[Bob]

You might find a surplus commercial 160 MHz Low Pass Filter in the used
market.  That would work just fine for what you are looking for.  I also
like Mike's idea of using a duplexer like the Diamond MX-72H.  The unused
port will need to be terminated with a 50 ohm dummy load.

73, Bob, WB4SON



On Sun, Mar 26, 2017 at 7:23 PM, Mike Diehl <diehl.mike.a at gmail.com> wrote:

> The first question I would ask is if 100w is really necessary. After that,
> you may want to look into using a diplexer as a low pass filter or find a
> dedicated 2m LPF.
>
> Mike Diehl
> AI6GS
>
> > On Mar 26, 2017, at 11:58 AM, Paul Baldock <pbaldock at frontier.com>
> wrote:
> >
> > I'm looking for a filter suggestion to reduce the third harmonic (435
> MHz) of my 145MHz 100W signal. How much attenuation would I get from a
> simple 435MHz quarter wave stub?
> >
> > Thanks
> >
> > - Paul KW7Y
> >
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