Simply the bandpass cavities areworking wellwith 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,
www.kerinvalecomaudio.com.au
---Original Message---
From: Gareth Bennett
Date: 01/23/06 21:28:53
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] adding a notch to bandpass cavity
Hi Ian,
What exactly is your problem with filtering? It reads likeIt 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 filterwith careful calculation.
Whatsthe temp in OZ at the moment?
Regards
_
Gareth Bennett
This e-mail is confidential, if you received this message in error, or youare not the intended recipient,please return it to the sender and destroy any copies.Thank you.
- Original Message -
From: Ian Wells
To: Repeater-Builder@yahoogroups.com
Sent: Monday, January 23, 2006 11:07 PM
Subject: [Repeater-Builder] adding a notch to bandpass cavity
Has anyone ever added a notch to a band pass cavity so it filters one frequency and notches another frequency in the samecavity tin.I am looking at filtering one rx frequency through the bandpass cavity but notch a TX frequency5.2 meg away from the first frequency .any sugestions ?
Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
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