RE: [Repeater-Builder] Isolator vs intermod panel?
Definitions: Circulator - ferrite device with 3 ports. Isolator - Circulator with a load on the 3rd port. Intermod panel - Isolator with a harmonic filter. The harmonic filter may consist of a 2nd harmonic notch filter or a low pass filter or a band pass cavity. 73 Gary K4FMX > -Original Message- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > buil...@yahoogroups.com] On Behalf Of Paul Kelley N1BUG > Sent: Monday, July 20, 2009 6:16 AM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Isolator vs intermod panel? > > I guess I was lucky in my first few years as a repeater owner. > Lately I have nothing but grief in many forms. (Yeah I know, welcome > to the real world!) > > Can someone tell me in basic terms what is the difference between an > isolator and an intermod suppression panel which contains an isolator? > > If one has a high power tube PA on a repeater, I assume he would > need to use a high power isolator or intermod panel after the PA? Or > would it be sufficient to use a lower power one between the solid > state exciter and tube PA? > > Thanks... > > Paul N1BUG > > > > > > > > Yahoo! Groups Links > > >
RE: [Repeater-Builder] Isolator vs intermod panel?
Paul; In general all of the Intermod panels I have seen have a bandpass filter too...not just an isolator. As for before or after.. It needs to be on the antenna side of the PA to do it's job.. Intermod panels are about suppressing any regenerated energy from others... which are antenna side issues. Doug KD8B >From: Repeater-Builder@yahoogroups.com >[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Kelley N1BUG >Sent: Monday, July 20, 2009 5:16 AM >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Isolator vs intermod panel? > > > > > >I guess I was lucky in my first few years as a repeater owner. >Lately I have nothing but grief in many forms. (Yeah I know, welcome >to the real world!) > >Can someone tell me in basic terms what is the difference between an >isolator and an intermod suppression panel which contains an isolator? > >If one has a high power tube PA on a repeater, I assume he would >need to use a high power isolator or intermod panel after the PA? Or >would it be sufficient to use a lower power one between the solid >state exciter and tube PA? > >Thanks... > >Paul N1BUG > >No virus found in this incoming message. >Checked by AVG - www.avg.com >Version: 8.5.392 / Virus Database: 270.13.20/2249 - Release Date: >07/19/09 17:59:00 >
RE: [Repeater-Builder] Isolator vs intermod panel?
Paul, Go to the EMR web site and read one of Bill Sr tech notes. You will find it very interesting. Here is a link for you go directly to the web page. http://www.emrcorp.com/techinfo/1/pdf/rf_isolators(1-14).pdf Mike Mike Mullarkey K7PFJ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Kelley N1BUG Sent: Monday, July 20, 2009 5:16 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Isolator vs intermod panel? I guess I was lucky in my first few years as a repeater owner. Lately I have nothing but grief in many forms. (Yeah I know, welcome to the real world!) Can someone tell me in basic terms what is the difference between an isolator and an intermod suppression panel which contains an isolator? If one has a high power tube PA on a repeater, I assume he would need to use a high power isolator or intermod panel after the PA? Or would it be sufficient to use a lower power one between the solid state exciter and tube PA? Thanks... Paul N1BUG No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.20/2249 - Release Date: 07/19/09 17:59:00
