Larry,
Take a look at the performance of that Bp cavity at 2nd harmonic of Fp See whacha think!
Roger Hansen, W6TOZ
-----Original Message-----
From: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Sent: Tue, 10 May 2005 08:49:23 -0700 (GMT-07:00)
Subject: Re: [Repeater-Builder] Low-Pass Filters for Ferrite Isolators
I trust that if there is no Low-Pass filter at the isolator output, a passband cavity would do the job? LJ -----Original Message----- From: Bob Dengler <[EMAIL PROTECTED]> Sent: May 9, 2005 10:13 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Low-Pass Filters for Ferrite Isolators At 5/7/2005 10:53 AM, you wrote: >Steve, > >There is nothing special about the low-pass filter that might require you >to use a >particular brand name. A ferrite isolator is a nonlinear device, and >therefore it >will generate a strong second harmonic which must be attenuated by either >a notch >filter or a low-pass filter. Not always. If the isolator is driven far below it's rating, it may not go nonlinear. We once tested an EMR Corp. 220 MHz isolator being driven with ~90 watts. The output spectrum from our RFPA was no different with the isolator in line (no increase or decrease in harmonic content). If you have a power attenuator handy, it might be worth actually looking at the harmonic levels coming out of your isolator with a spectrum analyzer. You can't use a coupler for this test because it's frequency response will taint the measurement. Bob NO6B Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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