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Simply the bandpass cavities are working well with my mobile diplexers cleaning up the little bit of desense I was getting on sites but there is still a little bit of desense occuring with very low signals and I was wondering if I could modify the cavities I have in place now to also notch the TX frequency to give even better isolation than the bandpass cavity on its own
Thank You,
Ian Wells,
Kerinvale Comaudio,
-------Original Message-------
Date: 01/23/06 21:28:53
Subject: Re: [Repeater-Builder] adding a notch to bandpass cavity
Hi Ian,
What exactly is your problem with filtering? It reads like It seems that you trying to achieve a steep reject notch for your associated Tx whilst rejecting any outside frequency from your Rx?
Are you suffering desense on your site?
I is your site shared by other users, and if so what are the frequencies in use?
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.
Whats the temp in OZ at the moment?
Regards
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Gareth Bennett
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----- Original Message -----
Sent: Monday, January 23, 2006 11:07 PM
Subject: [Repeater-Builder] adding a notch to bandpass cavity
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Has anyone ever added a notch to a band pass cavity so it filters one frequency and notches another frequency in the same cavity tin .I am looking at filtering one rx frequency through the bandpass cavity but notch a TX frequency 5.2 meg away from the first frequency .any sugestions ?
Thank You,
Ian Wells,
Kerinvale Comaudio,
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