I can add a notch cavity but i was hoping there is a way to include a notch
in a bandpass cavity .There is a link on the repeater builder website that
shows adding a small trimmer cap across the input and output a notch can be
added to a bandpass cavity
Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
-------Original Message-------
From: Dave VanHorn
Date: 01/24/06 02:43:26
To: [email protected]
Subject: [Repeater-Builder] Re: adding a notch to bandpass cavity
--- In
> Any conventional "Notch" filter can give you in excess of 20dB of
Rejection at 5 Meg separation with minimal loss at your Rx frequency.
In essence all notch filters are really a band pass-band reject filter
With careful calculation.
I get 40dB with a coax stub, but I don't remember the bandwidth offhand.
There's a way to calculate them so that they end up a pass at your
Desired freq (broad) and a notch at the undesired one (narrower), but I
don't have a pointer to a URL at the moment.
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